Maxxcom System Private Limited

ABB VHXM22A Static Protection RelayABB VHXM22A Static Protection Relay – Under Relay without Time Delay
ABB VHXM22A Static Protection Technical SpecificationType: Electro Mechanical Relay.Protection Type: Static Protection Relay Under / over voltage relay type VHXm
Features:
Static designVariable voltage settingVariable time delay settingDraw-out type designHand reset flagApplicationThe relay type VHXm is a static under/over voltage relay used for detection of under voltage (or loss of voltage) or over voltage in the AC system. Relay is used for over voltage protection and supervision in distribution systems. Relay is also used for overvoltage / undervoltage protection of Generators, Motors and Transformers.
Design and principleThe VHXm is a AC voltage measuring relay. Different versions are available for a) Fixed voltage setting with instantaneous operation b) Variable voltage setting with or without variable time delayed operation. The AC voltage to be measured is applied at terminal 3 and 4. The input voltage is isolated, scaled and suitably conditioned for measurement.Operating voltage level and time delay can be set with the potentiometer on the front-panel of the relay.The product of the potentiometer setting and multiplier (marked) is the set operate time for relay.The VHXm is powered by a DC auxiliary supply. The relay has a built-in electro-mechanical output relay providing medium duty contacts. The output relay also has one red hand reset flag. The relay is available in draw-out type flushmounting model.
STATIC PROTECTION RELAY PRODUCT RANGE
VHXm22A (40-80% of Un Under voltage, W/O time delay)VHXm22B (40-80% of Un Under voltage, with variable time delay)VHXm23A (80-140% of Un Over voltage, W/O time delay)VHXm23B (80-140% of Un Over voltage, with variable time delay)IRXm

ABB IRXm Static Protection Relay- Circulating Current RelayABB IRXm Static Protection high speed restricted earth fault protection relayABB IRXm Static Protection relay, the circulating current relay IRXm is mainly used for high-speed restricted earth fault protection of generators and transformer windings. For the selective detection of faults, current transformers in summation connection are employed with an external stabilizing resistor for high impedance method of measurement. The relay is provided with a band-pass filter which suppresses harmonics and DC components of the input current. The relay is suitable for current transformers with secondary rating of both 1A and 5A.
IRXm product range
Wide auxiliary voltage range as 24V/30V/ 48V/ 110-125V/ 220-250V DCFixed contact configuration 2NO+1NCKey benefits
Easy installation and maintenanceFast operationVisual indicationKey features
Draw-out typeWide current setting rangeSensitive high-speed protection on internal faultsOperation largely immune to DC components and harmonicsABB Static Protection Relay – Circulating Current Relay
Technical Specification
Type: Electro Mechanical Relay.Protection Type: Static Protection Relay. 

ABB VHXM22B Static Protection RelayABB VHXM22B Static Protection Relay – Under voltage relay with variable time delay
Technical Specification of ABB VHXM22B Static Protection RelayType: Electro Mechanical Relay.Protection Type: Static Protection Relay ApplicationThe relay type VHXm is a static under/over voltage relay used for detection of under voltage (or loss of voltage) or over voltage in the AC system. Relay is used for over voltage protection and supervision in distribution systems. Relay is also used for overvoltage / undervoltage protection of Generators, Motors and Transformers.
Design and principleThe VHXm is a AC voltage measuring relay. Different versions are available for a) Fixed voltage setting with instantaneous operation b) Variable voltage setting with or without variable time delayed operation. The AC voltage to be measured is applied at terminal 3 and 4. The input voltage is isolated, scaled and suitably conditioned for measurement.Operating voltage level and time delay can be set with the potentiometer on the front-panel of the relay.The product of the potentiometer setting and multiplier (marked) is the set operate time for relay.The VHXm is powered by a DC auxiliary supply. The relay has a built-in electro-mechanical output relay providing medium duty contacts. The output relay also has one red hand reset flag. The relay is available in draw-out type flushmounting model.
STATIC PROTECTION RELAY PRODUCT RANGE
VHXm22A (40-80% of Un Under voltage, W/O time delay)VHXm22B (40-80% of Un Under voltage, with variable time delay)VHXm23A (80-140% of Un Over voltage, W/O time delay)VHXm23B (80-140% of Un Over voltage, with variable time delay)IRXm

ABB VHXM23B Static Protection RelayABB VHXM23B Static Protection Relay – Over voltage relay with variable time delay
The relay type VHXm is a static under/over voltage relay used for detection of under voltage (or loss of voltage) or over voltage in the AC system. Relay is used for over voltage protection and supervision in distribution systems. Relay is also used for overvoltage / undervoltage protection of Generators, Motors and Transformers.
Technical Specification of ABB VHXM23B Static Protection RelayType: Electro Mechanical Relay.Protection Type: Static Protection Relay. OTHER HIGH SPEED TRIPPING RELAY RX SERIES
RXPSU6n , with 6 free contacts and without operation indicatorRXPSU14n with 14 free contacts and operation indicatorRXPQ8nFEATURES
High degree of reliability, even when it has been idle for a long timeRXPSU14n is with mechanical flag type indicator6 / 14 contacts with double interruption!Contact configuration can be changed with easeWide range of voltage and contact configurationAPPLICATION
For remote and automatic control there is often a need for contactors which have two stable contact positions, even in the dead state. This requirement is fulfilled by changeover contactors type RXPSU…n. The application of alternate control pulses to the coils because the contacts to change from the one state to the other. If the supply is interrupted, the contacts remain in their previous position, even when the voltage is restored.
Design and principleThe VHXm is a AC voltage measuring relay. Different versions are available for a) Fixed voltage setting with instantaneous operation b) Variable voltage setting with or without variable time delayed operation. The AC voltage to be measured is applied at terminal 3 and 4. The input voltage is isolated, scaled and suitably conditioned for measurement.
Operating voltage level and time delay can be set with the potentiometer on the front-panel of the relay.The product of the potentiometer setting and multiplier (marked) is the set operate time for relay.The VHXm is powered by a DC auxiliary supply. The relay has a built-in electro-mechanical output relay providing medium duty contacts. The output relay also has one red hand reset flag. The relay is available in draw-out type flushmounting model.

ABB VHXM23A Static Protection RelayABB VHXM23A Static Protection Relay – Over Relay without Time Delay
Technical Specification of ABB VHXM23A Static ProtectionType: Electro Mechanical Relay.Protection Type: Static Protection Relay. ApplicationThe relay type VHXm is a static under/over voltage relay used for detection of under voltage (or loss of voltage) or over voltage in the AC system. Relay is used for over voltage protection and supervision in distribution systems. Relay is also used for overvoltage / undervoltage protection of Generators, Motors and Transformers.
Design and principleThe VHXm is a AC voltage measuring relay. Different versions are available for a) Fixed voltage setting with instantaneous operation b) Variable voltage setting with or without variable time delayed operation. The AC voltage to be measured is applied at terminal 3 and 4. The input voltage is isolated, scaled and suitably conditioned for measurement.
Operating voltage level and time delay can be set with the potentiometer on the front-panel of the relay.The product of the potentiometer setting and multiplier (marked) is the set operate time for relay.The VHXm is powered by a DC auxiliary supply. The relay has a built-in electro-mechanical output relay providing medium duty contacts. The output relay also has one red hand reset flag. The relay is available in draw-out type flushmounting model.
FeaturesStatic designVariable voltage settingVariable time delay settingDraw-out type designHand reset flag
STATIC PROTECTION RELAY PRODUCT RANGE
VHXm22A (40-80% of Un Under voltage, W/O time delay)VHXm22B (40-80% of Un Under voltage, with variable time delay)VHXm23A (80-140% of Un Over voltage, W/O time delay)VHXm23B (80-140% of Un Over voltage, with variable time delay)IRXm

ABB RXPSU6n Bi-Stable RelayABB RXPSU6n Bi-Stable Relay – Bi-Stable relay, electrically reset contacts without operation indicator
ApplicationFor remote and automatic control there is often a need for contactors which have two stable contact positions, even in the dead state. This requirement is fulfilled by changeover contactors type RXPSU…n. The application of alternate control pulses to the coils cause the contacts to change from the one state to the other. If the supply is interrupted, the contacts remain in their previous position, even when the voltage is restored.
Technical Specification of ABB RXPSU6n Bi-Stable RelayType: Electro Mechanical Relay.Protection Type: Bi-Stable Relay. Features
High degree of reliability, even when it has been idle for a long timeRXPSU14n is with mechanical flag type indicator6 / 14 contacts with double interruptionContact configuration can be changed with easeWide range of voltage and contact configurationDesign and principle
The bistable relays in the COMBIFLEX system, type RXPSU6n and RXPSU14n are composed of the same constructional elements as the established contactors type P8n. Two magnet systems are interconnected by a pivoted element. In the type RXPSU6n… with 6 free contacts, only one system has contacts; in type PSU14n.. with 14 freecontacts, both systems have contacts. In each case two contacts are required for changing over the connection of the coils. The contacts are arranged symmetrically on both sides of the relay coil and armature assembly in two stacks. They are easily accessible and the conversion from N/C to N/O contacts and vice versa is simple. The maximum rated voltage is 250V d.c. or a.c. and the material used is hard silver. The following definitions apply for reset and operatecondition; reset condition – Armature assembly position is away from the base i.e. the upper system has been pulsed and lower system is ready to be pulsed. The flag strips are invisible i.e. white during this condition. Operate condition – Armature assembly position is closer to the base i.e. the lower system has been pulsed and upper system is readyto be pulsed. The flag strips are visible i.e. red during this condition.
A transparent, incombustible cover with a gasket protects the contacts against dirt. The terminals of the contact  stacks themselves permit two wires of 1.5mm diameter maximum to be secured. Changeover relays must always be mounted with the contact post horizontal, that is with the base on a vertical surface. The plug-in relay module occupies two seats (2u 12C).

ABB PSU14n-2X High Speed Tripping RelayABB PSU14n-2X Tripping Relay Tripping Relay –High Speed Tripping Relay, Electrically Reset Contacts, With Operation Indicator
Technical Specification of ABB PSU14n-2X Tripping RelayType: Electro Mechanical Relay.Protection Type: High Speed Tripping Relay.Features
High degree of reliability, even when it has been idle for a long timePSU14n.. with mechanical flag type indicator6 / 14 contacts with double interruptionContact configuration can be changed with easeDifferent mounting variantsWide range of voltage and contact configurationApplicationFor remote and automatic control there is often a need for contactors which have two stable contact positions, even in the dead state. This requirement is fulfilled by changeover contactors type PSU..n.. The application of alternate control pulses to the coils cause the contacts to change from the one state to the other. If the supply is interrupted, the contacts remain in their previous position, even when the voltage is restored.
Design and principleBasically, the PSU changeover contactors are composed of the same constructional elements as the established contactors type P8n. Two magnet systems are inter- connected by a pivoted element. In the type PSU6n… with 6 free contacts, only one system has contacts; in type PSU14n… with 14 free contacts, both systems have contacts. In each case two contacts are required for changing over the connection of the coils.
The contacts are arranged symmetrically on both sides of the relay coil and armature assembly in two stacks. They are easily accessible and the conversion from N/C to N/O contacts and vice versa is simple. The maximum rated voltage is 250V d.c. or a.c. and the material used is hard silver. The following definitions apply for reset and operatecondition; reset condition – Armature assembly position is away from the base i.e. the upper system has been pulsed and lower system is ready to be pulsed. The flag strips are invisible i.e. white during this condition. Operate condition – Armature assembly position is closer to the base i.e. the lower system has been pulsed and upper system is readyto be pulsed. The flag strips are visible i.e. red during this condition.
A transparent, incombustible cover with a gasket protects the contacts against dirt. The terminals of the contact stacks themselves permit two wires of 1.5mm diameter maximum to be secured. The terminals on the base for the external wiring have holes with a diameter of 3.8mm. The terminals on the plug-in base can accommodate two wires, each 2 with a cross-section of 2.5mm . Changeover relays must always be mounted with the contact post horizontal, that is with the base on a vertical surface. The plug-in version offers many advantages, both from the point of view ofinstallation and afterwards for maintenance. It is fitted with locating pegs which prevent it from being inserted the wrong way round. The labelling of the terminals on the base is identical to that on the contact stacks.

ABB PQ5nCH2J High Speed Tripping RelayABB PQ5nCH2J High Speed Tripping Relay –High Speed Tripping Relay, Hand Reset Contacts With Operation Indicator
Technical Specification of ABB PQ5nCH2J High Speed Tripping RelayType: Electro Mechanical Relay.Protection Type: High Speed Tripping Relay. Electromechanical master trip relays PQ_ seriesHigh speed tripping relays for high as well as low burden applications
The PQ_ series relays are intended for the master trip applications in utility substations and industrial power systems, where a high degree of reliability and a high contact rating are stipulated with minimum internal consumption. Acting as instantaneous switching element, it provides galvanic separation and contact multiplication in tripping circuits of protective applications.
The relays are available in both low impedance as well as high impedance variants. The low burden type relay are generally used when initiating contact and master trip relay is in same cubicle. The high burden type relay is intended for applications where initiating contacts are coming from remote. The high burden provides immunity to capacitance discharge currents, which can result at the inception of an earth fault on battery wiring and immunity to subsequent leakage current.
PQ_ series product range
PQ8nCH2JMaster trip relay with 7 contacts, low burdenPQ5nCH2JMaster trip relay with 4 contacts, low burdenPQ8nC2JWMaster trip relay with 6 contacts, high burdenKey benefits
Compact and robustHighly reliableVisual indicationKey features
High speed operationWide range of voltage and contact configurationDouble interruption contactsSuitable for both AC and DC auxiliary voltage for low burden modelsHand reset contact and trip indicationDesign and Principle:The relay type PQ…. is specially designed for high speed operation and mechanical latching. It has flag indicator which indicates trip status when the relay latches. The relay can be hand reset by pressing in and resetting the operation indicator. The trip relays type PQ.. are instantaneous, plunger type relay with 4/6/7 contacts with double interruption. They are designed to operate from d.c. The low burden relays can also operate from a.c. when preceded by rectifier.
The relay has a magnet system which comprises a fixed core and a moving, plunger-type armature, actuating thecontact bar directly. When the coil is deenergized, the armature of the magnet and the contact bar are forced back into their initial position by spring action when relay is resetted.The contacts are arranged symmetrically in two rows, on either side of the magnet, clearly visible and readily accessible.The high burden relays have 2 cutoff contacts in series with coil, which ensures momentory high burden during pick up which is cut off after relay operation. The terminals on 1/2’S’ flush mounting case have an opening which can accommodate two wires with a crosssection of 1.5mm².

ABB PQ8nCH2J High Speed Tripping RelayABB PQ8nCH2J High Speed Tripping Relay – High Speed Tripping Relay, Hand Reset Contacts with Operation indicator
Technical Specification of ABB PQ8nCH2J High Speed Tripping RelayType: Electro Mechanical Relay.Protection Type: High Speed Tripping Relay. Features:
* High speed operation
* Contact configuration can be changed with ease* High and Low burden alternatives
* Wide range of voltage & contact configurations* High degree of reliability, even when it has been idle for a long time* Low burden models suitable for ac and dc operation* 4/6/7 contacts with double interruption
* Hand reset contact and trip indication
Application:
The tripping relays type PQ…. are used for all kinds of control and protection circuits in power stations and industrialinstallations, where a high degree of reliability and a high contact rating are stipulated, with minimal internal consumption.Acting as instantaneous switching element, relay provides galvanic separation and contact multiplication in tripping circuits of protective applications. Low burden tripping relays PQ8nCH2J and PQ5nCH2J are suitable for HV, MV and LV installations where immunity to capacitance discharge and high minimum operation currents are not required. High burden tripping relays PQ8nC2JW are suitable for applications where initiating contacts are coming from remote.The high burden provides immunity to capacitance discharge currents, which can result at the inception of an earth fault on battery wiring and immunity to the subsequent leakage current. Both low as well high burden relays aresuitable for relay coil supervision through either LED lamp or trip circuit supervision relay type TCS.
Design and Principle:The relay type PQ…. is specially designed for high speed operation and mechanical latching. It has flag indicator which indicates trip status when the relay latches. The relay can be hand reset by pressing in and resetting the operation indicator. The trip relays type PQ.. are instantaneous, plunger type relay with 4/6/7 contacts with double interruption. They are designed to operate from d.c. The low burden relays can also operate from a.c. when preceded by rectifier. The relay has a magnet system which comprises a fixed core and a moving, plunger-type armature, actuating the contact bar directly.
When the coil is deenergized, the armature of the magnet and the contact bar are forced back into their initial position by spring action when relay is resetted.  The contacts are arranged symmetrically in two rows, on either side of the magnet,clearly visible and readily accessible. The high burden relays have 2 cutoff contacts in series with coil, which ensures momentory high burden during pick up which is cut offafter relay operation. The terminals on 1/2’S’ flush mounting case have an opening which can accommodatetwo wires with a crosssection of 1.5mm².

ABB PSU14nCJW High Speed Tripping RelayABB PSU14nCJW High Speed Tripping Relay – High speed high burden tripping relay, hand/ electrical reset contacts with operation indicator
Technical Specification of ABB PSU14nCJW Tripping RelayType: Electro Mechanical Relay.Protection Type: High Speed Tripping Relay. Features
High degree of reliability, even when it has been idle for a long timePSU14n.. with mechanical flag type indicator6 / 14 contacts with double interruptionContact configuration can be changed with easeDifferent mounting variantsWide range of voltage and contact configurationApplicationFor remote and automatic control there is often a need for contactors which have two stable contact positions, even in the dead state. This requirement is fulfilled by changeover contactors type PSU..n.. The application of alternate control pulses to the coils cause the contacts to change from the one state to the other. If the supply is interrupted, the contacts remain in their previous position, even when the voltage is restored.
Design and principleBasically, the PSU changeover contactors are composed of the same constructional elements as the established contactors type P8n. Two magnet systems are inter- connected by a pivoted element. In the type PSU6n… with 6 free contacts, only one system has contacts; in type PSU14n… with 14 free contacts, both systems have contacts. In each case two contacts are required for changing over the connection of the coils.
The contacts are arranged symmetrically on both sides of the relay coil and armature assembly in two stacks. They are easily accessible and the conversion from N/C to N/O contacts and vice versa is simple. The maximum rated voltage is 250V d.c. or a.c. and the material used is hard silver. The following definitions apply for reset and operatecondition; reset condition – Armature assembly position is away from the base i.e. the upper system has been pulsed and lower system is ready to be pulsed. The flag strips are invisible i.e. white during this condition. Operate condition – Armature assembly position is closer to the base i.e. the lower system has been pulsed and upper system is readyto be pulsed. The flag strips are visible i.e. red during this condition.
A transparent, incombustible cover with a gasket protects the contacts against dirt. The terminals of the contact stacks themselves permit two wires of 1.5mm diameter maximum to be secured. The terminals on the base for the external wiring have holes with a diameter of 3.8mm. The terminals on the plug-in base can accommodate two wires, each 2 with a cross-section of 2.5mm . Changeover relays must always be mounted with the contact post horizontal, that is with the base on a vertical surface. The plug-in version offers many advantages, both from the point of view ofinstallation and afterwards for maintenance. It is fitted with locating pegs which prevent it from being inserted the wrong way round. The labelling of the terminals on the base is identical to that on the contact stacks.

ABB PSU6nCJW High Speed Tripping RelayABB PSU6nCJW High Speed Tripping Relay – High Speed High Burden Tripping Relay, Hand/ Electrical Reset Contacts with Operation Indicator
Technical Specification of ABB PSU6nCJW Tripping RelayType: Electro Mechanical Relay.Protection Type: High Speed Tripping Relay. Electromechanical and solid state relays
For new applications where reliable operation is essential, in harsh environments, or in existing installations where an exact replacement is required
ABB electromechanical relays have protected the power system for more than 100 years, and with the proper inspection, maintenance, and testing techniques, these relays can guard the power system for many more years.
Solid state electronic components provide a similar function to electromechanical relays but do not have any moving components, increasing long-term reliability.
ABB distribution automation products:
ABB delivers a full range of genuine IEC 61850 protection and control products also including network automation. ABB’s IEC 61850 compliant solutions offer a unified user-experience for operating power distribution systems from the secondary substation level up to the NCC level. The unified user-experience provides enhanced reliability, safety and the operational efficiency of network control and management. The protection and control devices also measure and collect data from the power system and intelligent network components to support the asset and business management of power system operators.
ABB distribution automation products are built to withstand the rigors of the most demanding environments including marine and offshore, industrial facilities such as mines and paper and petrochemical plants, as well as utilities in urban and rural locations.

ABB PSU6n-X High Speed Tripping RelayABB PSU6n-X High Speed Tripping Relay – High Speed Tripping Relay without Operation Indicator
Technical Specification of ABB PSU6n-X High Speed Tripping RelayType: Electro Mechanical Relay.Protection Type: High Speed Tripping Relay. Features
High degree of reliability, even when it has been idle for a long timePSU14n.. with mechanical flag type indicator6 / 14 contacts with double interruptionContact configuration can be changed with easeDifferent mounting variantsWide range of voltage and contact configurationApplicationFor remote and automatic control there is often a need for contactors which have two stable contact positions, even in the dead state. This requirement is fulfilled by changeover contactors type PSU..n.. The application of alternate control pulses to the coils cause the contacts to change from the one state to the other. If the supply is interrupted, the contacts remain in their previous position, even when the voltage is restored.
Design and principleBasically, the PSU changeover contactors are composed of the same constructional elements as the established contactors type P8n. Two magnet systems are inter- connected by a pivoted element. In the type PSU6n… with 6 free contacts, only one system has contacts; in type PSU14n… with 14 free contacts, both systems have contacts. In each case two contacts are required for changing over the connection of the coils.
The contacts are arranged symmetrically on both sides of the relay coil and armature assembly in two stacks. They are easily accessible and the conversion from N/C to N/O contacts and vice versa is simple. The maximum rated voltage is 250V d.c. or a.c. and the material used is hard silver. The following definitions apply for reset and operatecondition; reset condition – Armature assembly position is away from the base i.e. the upper system has been pulsed and lower system is ready to be pulsed. The flag strips are invisible i.e. white during this condition. Operate condition – Armature assembly position is closer to the base i.e. the lower system has been pulsed and upper system is readyto be pulsed. The flag strips are visible i.e. red during this condition.
A transparent, incombustible cover with a gasket protects the contacts against dirt. The terminals of the contact stacks themselves permit two wires of 1.5mm diameter maximum to be secured. The terminals on the base for the external wiring have holes with a diameter of 3.8mm. The terminals on the plug-in base can accommodate two wires, each 2 with a cross-section of 2.5mm . Changeover relays must always be mounted with the contact post horizontal, that is with the base on a vertical surface. The plug-in version offers many advantages, both from the point of view ofinstallation and afterwards for maintenance. It is fitted with locating pegs which prevent it from being inserted the wrong way round. The labelling of the terminals on the base is identical to that on the contact stacks.

ABB RXPQ8n High Speed Tripping Relay ABB RXPQ8n High Speed Tripping Relay – High speed tripping relay, hand reset contacts with operation indicator
Technical Specification of ABB RXPQ8n Tripping RelayType: Electro Mechanical Relay.Protection Type: High Speed Tripping Relay. OTHER HIGH SPEED TRIPPING RELAY RX SERIES
RXPSU6n , with 6 free contacts and without operation indicatorRXPSU14n with 14 free contacts and operation indicatorRXPQ8nFeaturesHigh degree of reliability, even when it has been idle for a long time7 contacts with double interruptionContact configuration can be changed with easeWide range of voltage & contact configurationsSpecial versions -RXPQ8n….. High speed locking relay hand reset
Application
The auxiliary relays type RXP8n,RXPQ8n are used for all kinds of control and protection circuits in power stations and industrial installations, where a high degree of reliability and a high contact rating are stipulated, with minimal internal consumption. Acting as an instantaneous switching element, it provides galvanic separation and contact multiplication in tripping and signaling circuits of protective relays.
Design and principleThe auxiliary relays in the COMBIFLEX system, type RXP8n and RXPQ8n are instantaneous plunger typerelay with 7 contacts with double interruption. They are designed to operate from D.C. The magnet system comprises a fixed core and a moving, plunger-type armature, which actuates the contact bar directly. When the coil is de-energized , the armature of the magnet and the contact bar are forced back into their initial position by a springaction. The contacts are arranged symmetrically in two rows, on either side of the magnet, clearly visibleand readily accessible.
They are designed for a maximum rated voltage of 250V D.C. or A.C. The material used for the contact tips is hard silver. At the most, 3 normally closed contacts are permissible, which should be distributed evenly between two sides. The field weakening resistor is cut in by means of a delayed normally closed contact on a special contact bar in series with the coil.The relay type RXPQ8n is specially designed for high speed operation and mechanical latching. It has an operation indicator which, pops out when the relay latches. The relay can be manually reset by pressing in and resetting the operation indicator.A transparent protective hood of material that does not burn readily provides good protection against dust. The plug-in relay module occupies two seats (2U 12C). The auxiliary relays should always be mounted with their contact bar horizontal.

ABB RXPSU14n High Speed Tripping RelayABB High Speed Tripping Relay – ABB RXPSU14n Tripping Relay , High Speed Trip Relay without Operation Indicator
ABB RXPSU14n Tripping Relay Technical SpecificationType: Electro Mechanical Relay.Protection Type: High Speed Tripping Relay. Design and principleThe bistable relays in the COMBIFLEX system, type RXPSU6n and RXPSU14n are composed of the same constructional elements as the established contactors type P8n. Two magnet systems are interconnected by a pivoted element. In the type RXPSU6n with 6 free contacts, only one system has contacts; in type RXPSU14n with 14 freecontacts, both systems have contacts. In each case two contacts are required for changing over the connection of the coils.
The contacts are arranged symmetrically on both sides of the relay coil and armature assembly in two stacks. They are easily accessible and the conversion from N/C to N/O contacts and vice versa is simple. The maximum rated voltage is 250V DC or AC and the material used is hard silver. The following definitions apply for reset and operatecondition. Reset condition – Armature assembly position is away from the base i.e. the upper system has been pulsed and lower system is ready to be pulsed. The flag strips are invisible i.e. white during this condition. Operate condition – Armature assembly position is closer to the base i.e. the lower system has been pulsed and upper system is ready to be pulsed. The flag strips are visible i.e. red during this condition.A transparent, incombustible cover with a gasketprotects the contacts against dirt.
The terminals of the contact stacks themselves to permit two wires of 1.5mm diameter maximum to be secured.Changeover relays must always be mounted with the contact post horizontal, that is with the base on a vertical surface. The plug-in relay module occupies two seats (2U 12C).
Type designation of auxiliary relays
RXPSU:  Basic relay with combiflex mounting.
6n : with 6 free contacts and without operation indicator
14n : with 14 free contacts and operation indicator.
OTHER HIGH SPEED TRIPPING RELAY RX SERIES
RXPSU6n , with 6 free contacts and without operation indicatorRXPSU14n with 14 free contacts and operation indicatorRXPQ8nFEATURES
High degree of reliability, even when it has been idle for a long timeRXPSU14n is with mechanical flag type indicator6 / 14 contacts with double interruption!Contact configuration can be changed with easeWide range of voltage and contact configuration

ABB RXPSU6n High Speed Tripping RelayABB RXPSU6n High Speed Tripping Relay – High speed trip relay without operation indicator
Technical Specification of ABB RXPSU6n Tripping RelayType: Electro Mechanical Relay.Protection Type: High Speed Tripping Relay. OTHER HIGH SPEED TRIPPING RELAY RX SERIES
RXPSU6n , with 6 free contacts and without operation indicatorRXPSU14n with 14 free contacts and operation indicatorRXPQ8nFeatures
High degree of reliability, even when it has been idle for a long timeRXPSU14n is with mechanical flag type indicator6 / 14 contacts with double interruptionContact configuration can be changed with easeWide range of voltage and contact configurationApplication
For remote and automatic controls there is often a need for contactors which have two stable contact positions, even in the dead state. This requirement is fulfilled by changeover contactors type RXPSU…n.The application of alternate control pulses to the coils cause the contacts to change from the one state to the other. If the supply is interrupted, the contacts remain in their previous position, even when the voltage is restored.

ABB RXTCS Auxiliary Relay-Trip circuit supervision relayThe supervision relay type ABB RXTCS Auxiliary Relay or electromechanical relay is intended for a continuous supervision of circuit breaker trip circuit and gives an alarm for loss of auxiliary supply, faults on the trip-coil or its wires independent of the breaker position, faults on the breaker auxiliary contacts and faults in the supervision relay itself.
RXTCS electromechanical relay Technical Specification
Type: Electro Mechanical Relay.Protection Type: Supervision Relay. ABB RXTCS Features
Continuous supervision of complete trip circuit independent of the circuit breaker position.Detects faults in the supervised circuits, such as loss of voltage, circuit breakage, contact degeneration in connections and resistivity increases in wires, contacts and coilsLow-level measuring current enables application in sensitive or high resistance circuitsOperation delayed to avoid spurious signals, for instance, on circuit breaker operationOperation indication by a single dual colour LEDComplete range of rated voltages either ac or dcGalvanic isolation is possible between auxiliary source and supervised circuitVery low burden on auxiliary sourceRXTCS electromechanical relay ApplicationIn a protection system the tripping of circuit breaker is crucial. Should an interruption occur in a trip circuit a possible network fault would not be disconnected and the fault would have to be cleared by another protection upstreams in the power system. The supervision function is particularly important when there is only one tripping coil and CB tripping is vital, for instance, for generator circuit breakers or other important circuit breaker in distribution networks.

ABB TCS Auxiliary Relay Trip Circuit Supervision RelayABB TCS Auxiliary Relay Trip Circuit Supervision Relay is intended for a continuous supervision of circuit breaker trip circuit and gives an alarm for loss of auxiliary supply, faults on the trip-coil or its wires independent of the breaker position, faults on the breaker auxiliary contacts and faults in the supervision relay itself.
ABB TCS Relay Technical SpecificationType: Electro Mechanical Relay.Protection Type: Supervision Relay. ABB TCS Auxiliary Relay FeaturesContinuous supervision of complete trip circuit independent of the circuit breaker position.Detects faults in the supervised circuits, such as loss of voltage, circuit breakage, contact degeneration in connections and resistivity increases in wires, contacts and coilsLow-level measuring current enables application in sensitive or high resistance circuitsOperation delayed to avoid spurious signals, for instance, on circuit breaker operationOperation indication by a single dual colour LEDComplete range of rated voltages either ac or dcGalvanic isolation is possible between auxiliary source and supervised circuitVery low burden on auxiliary sourceApplicationIn a protection system the tripping of circuit breaker is crucial. Should an interruption occur in a trip circuit apossible network fault would not be disconnected and the fault would have to be cleared by another protection upstreams in the power system. The supervision function is particularly important when there is only one tripping coil and CB tripping is vital, for instance, for generator circuit breakers or other important circuit breaker in distribution networks.

ABB UVT92M Supervision Relay- Fuse failure relayABB UVT92M Supervision Relay, the fuse failure relay is a high speed static relay intended for continuous monitoring of fuses against blowing out or inadvertent removals. This relay can be used for one, two or all three phase fuse failure detection. The plug-in socket type design for terminals, supports ease of installation and maintenance.
Technical Specification
Type: Electro Mechanical Relay.Protection Type: Supervision Relay. UVT92M fuse failure relay Features• Fast operation• 1, 2 or 3 phase fuse fail detection• No continuous drain on D.C. auxiliary supply• Hand reset LED operation indication• Sensitivity down to 2.5VA load on secondary
ApplicationThe fuse failure relay is intended for continuous monitoring of fuses against blowing out or inadvertent removals. In application where failure or inadvertent removal of fuse may cause incorrect tripping.The relay can also be used for supervision of potential transformer fuses so as to give blocking signals to voltage operated protection schemes such as distance protection, under impedance and under voltage relays. It can be used for alarming purpose in synchronizing circuits.
Design and principle of operationThe fuse failure relay is a high speed static relay with built-in electro mechanical output relays providing two change over signaling duty contacts. The relay can operate for single, two or three phase fuse failure in secondary circuit.During the normal operation, the potential across the fuses is nearly zero. When fuse fail will occur in any of the phase, the potential across the particular fuse goes up. This potential drives the circuit path for external LED indication and relay output.
The fuse fail in any phase is indicated by ‘Trip’ LED and will remain latched until reset push button is pressed and fuse is healthy. After replacing the faulty fuses, the output contacts can be reset. The plug in socket design for terminals facilitates ease of installation and maintenance. The relay is suitable for flush mounting on panel and issufficiently protected against any ingress. A unique Plug-in PCBA assembly and sheet metal case makes the relay robust and light weight.

ABB Auxiliary Relay CV2A2JABB CV2A2J Auxiliary Relay – Two Element Auxiliary Relay, Self-Reset Contacts with Operation Indicator
Technical Specification of ABB CV2A2J Auxiliary RelayType: Electro Mechanical Relay.Protection Type: Auxiliary Relay. Electromechanical and solid state relays
For new applications where reliable operation is essential, in harsh environments, or in existing installations where an exact replacement is required
ABB electromechanical relays have protected the power system for more than 100 years, and with the proper inspection, maintenance, and testing techniques, these relays can guard the power system for many more years.
Solid state electronic components provide a similar function to electromechanical relays but do not have any moving components, increasing long-term reliability.
CV2 PRODUCT RANGE:
The indicating relay type CV2 is an instantaneous hinged-armature relay with two contacts. These may be either two normally open contacts, or one normally open and one normally closed. The indicator can be reset simply by pressing the knob back in. Some of the other Aux relays are CV2A2J, CV2AJ, CV2D2J, and CV2DJ, P8nAHX, P8nCH2J, RXP8n

ABB CV2AJ Auxiliary RelayABB CV2AJ Auxiliary Relay  – Single Element Auxiliary Relay, Self-Reset Contacts with Operation Indicator
Technical Specification of ABB CV2AJ Auxiliary RelayType: Electro Mechanical Relay.Protection Type: Auxiliary Relay. CV2 PRODUCT RANGE:
The indicating relay type CV2 is an instantaneous hinged-armature relay with two contacts. These may be either two normally open contacts, or one normally open and one normally closed. The indicator can be reset simply by pressing the knob back in. Some of the other Aux relays are CV2A2J, CV2AJ, CV2D2J, and CV2DJ, P8nAHX, P8nCH2J, RXP8n

ABB CV2D2J Auxiliary RelayABB CV2D2J Auxiliary Relay – Two Element Auxiliary Relay, Self-Reset Contacts with Operation Indicator
ABB CV2D2J Auxiliary Relay – Technical SpecificationType: Electro Mechanical Relay.Protection Type: Auxiliary Relay. CV2 PRODUCT RANGE:
The indicating relay type CV2 is an instantaneous hinged-armature relay with two contacts. These may be either two normally open contacts, or one normally open and one normally closed. The indicator can be reset simply by pressing the knob back in. Some of the other Aux relays are CV2A2J, CV2AJ, CV2D2J, and CV2DJ, P8nAHX, P8nCH2J, RXP8n

ABB CV2DJ Auxiliary RelayABB CV2DJ Auxiliary Relay – Single element auxiliary relay, self-reset contacts with operation indicator
Technical Specification of ABB CV2DJ Auxiliary RelayType: Electro Mechanical Relay.Protection Type: Auxiliary Relay. CV2 PRODUCT RANGE:
The indicating relay type CV2 is an instantaneous hinged-armature relay with two contacts. These may be either two normally open contacts, or one normally open and one normally closed. The indicator can be reset simply by pressing the knob back in. Some of the other Aux relays are CV2A2J, CV2AJ, CV2D2J, and CV2DJ, P8nAHX, P8nCH2J, RXP8n

ABB P8NCH2J Auxiliary RelayABB P8NCH2J Auxiliary Relay – Single element auxiliary relay, self-reset contacts with operation indicator
Key benefits
Highly ReliableCompact and RobustVisual IndicationKey features
Double interruption contactsWide range of contact and voltage configurationsHand reset operationTechnical Specification of ABB P8NCH2J Auxiliary RelayType: Electro Mechanical Relay.Protection Type: Auxiliary Relay. Auxiliary relays P8n,PN8nThe auxiliary relays are used for all kinds of control and protection circuits as an instantaneous switching elementThe auxiliary relays P8n and PN8n are instantaneous, auxiliary plunger type relay with 7 double interruption contacts. They are used in installations where high degree of reliability and high contact rating are stipulated with minimal internal consumption. They act as instantaneous switching element, providing galvanic separation and contact multiplication in tripping and signaling circuits of protective relays.
The P8n relay is designed for high speed operation. It has an operation indicator which pops out when the contact system picks up and relay latches. The operation indication can be reset manually. Other variant without operation indication can also be selected based on order code.
The PN8n relay is specially designed for minimum drop out of approximately 20% of rated voltage. The relay is available with operation indication which pops out when the contact system drops off. The operation indication can be reset manually.

ABB Pn8CH2J Supervision RelayABB Pn8CH2J Supervision Relay is No Volt Relay with Reverse Flag, Self-Reset Contacts
ABB Pn8CH2J Supervision Relay Technical SpecificationType: Electro Mechanical Relay.Protection Type: Supervision Relay. Auxiliary relays P8n,PN8n
The auxiliary relays are used for all kinds of control and protection circuits as an instantaneous switching element
The auxiliary relays P8n and PN8n are instantaneous, auxiliary plunger type relay with 7 double interruption contacts. They are used in installations where high degree of reliability and high contact rating are stipulated with minimal internal consumption. They act as instantaneous switching element, providing galvanic separation and contact multiplication in tripping and signaling circuits of protective relays.
The P8n relay is designed for high speed operation. It has an operation indicator which pops out when the contact system picks up and relay latches. The operation indication can be reset manually. Other variant without operation indication can also be selected based on order code.
The PN8n relay is specially designed for minimum drop out of approximately 20% of rated voltage. The relay is available with operation indication which pops out when the contact system drops off. The operation indication can be reset manually.
Auxiliary relays P type product range
P8nAHX            Basic auxiliary relay with high speed operation without operation indicator with field weakening resistor and plug in baseP8nCH2J          Basic auxiliary relay with high speed operation with operation indicator with field weakening resistor with 1/2S size, flush mounting casePN8nCH2J        Basic auxiliary relay with high drop out rating with operation indicator with field weakening resistor with 1/2S size, flush mounting case

ABB PQ8nC2JW Auxiliary RelayABB PQ8nC2JW Auxiliary Relay – High Speed High Burden Tripping Relay, Hand Reset Contacts with Operation Indicator
Technical Specification of ABB PQ8nC2JW Auxiliary RelayType: Electro Mechanical Relay.Protection Type: High Speed Tripping Relay. Features:
* High speed operation
* Contact configuration can be changed with ease* High and Low burden alternatives
* Wide range of voltage & contact configurations* High degree of reliability, even when it has been idle for a long time* Low burden models suitable for ac and dc operation* 4/6/7 contacts with double interruption
* Hand reset contact and trip indication
Application:
The tripping relays type PQ…. are used for all kinds of control and protection circuits in power stations and industrialinstallations, where a high degree of reliability and a high contact rating are stipulated, with minimal internal consumption.Acting as instantaneous switching element, relay provides galvanic separation and contact multiplication in tripping circuits of protective applications. Low burden tripping relays PQ8nCH2J and PQ5nCH2J are suitable for HV, MV and LV installations where immunity to capacitance discharge and high minimum operation currents are not required. High burden tripping relays PQ8nC2JW are suitable for applications where initiating contacts are coming from remote.The high burden provides immunity to capacitance discharge currents, which can result at the inception of an earth fault on battery wiring and immunity to the subsequent leakage current. Both low as well high burden relays aresuitable for relay coil supervision through either LED lamp or trip circuit supervision relay type TCS.

ABB PSU14n-2X Bi-Stable RelayABB PSU14n-2X Bi-Stable Relay – Bi-Stable Relay, Electrically Reset Contacts with Operation Indicator.
Technical Specification of ABB PSU14n-2X Bi-Stable RelayType: Electro Mechanical Relay.Protection Type: Bi-Stable Relay. ELECTROMECHANICAL BISTABLE RELAYThe bistable relays are mainly used for remote and automatic controls where there is often a need for contactors which have two stable contact positions, even in the dead state.
The application of alternate control pulses to the coils because the contacts to change from the one state to the other. If the supply is interrupted, the contacts remain in their previous position, even when the voltage is restored. The contacts are arranged symmetrically on both sides of relay coil and armature assembly in two stacks.
BISTABLE RELAY PRODUCT RANGE
PSU6nXBasic relay with 6 free contacts and without indicator mounted on one set of plug-in basePSU14n2XBasic relay with 14 free contacts and with indicator mounted on two sets of plug-in baseRXPSU6nRXPSU14nKEY BENEFITS
Easy installation and maintenanceHighly reliableVisual IndicationKEY FEATURES
Wide range of voltage and contact configurationVisible flag strips during operate conditionLarge diameter of terminals for external wiring on plug-in base terminalElectromechanical and solid state relays
For new applications where reliable operation is essential, in harsh environments, or in existing installations where an exact replacement is required
ABB electromechanical relays have protected the power system for more than 100 years, and with the proper inspection, maintenance, and testing techniques, these relays can guard the power system for many more years.
Solid state electronic components provide a similar function to electromechanical relays but do not have any moving components, increasing long-term reliability.

ABB PSU6n-X Bi-Stable RelayABB PSU6n-X Bi-Stable Relay – Bi-Stable Relay, Electrically Reset Contacts without Operation Indicator
ApplicationFor remote and automatic control there is often a need for contactors which have two stable contact positions, even in the dead state. This requirement is fulfilled by changeover contactors type PSU..n. The application of alternate control pulses to the coils cause the contacts to change from the one state to the other. If the supply is interrupted, the contacts remain in their previous position, even when the voltage is restored.
Technical Specification of ABB PSU6n-X Bi-Stable RelayType: Electro Mechanical Relay.Protection Type: Bi-Stable Relay. Features
High degree of reliability, even when it has been idle for a long timePSU14n.. with mechanical flag type indicator6 / 14 contacts with double interruptionContact configuration can be changed with easeDifferent mounting variantsWide range of voltage and contact configurationDesign and principleBasically, the PSU changeover contactors are composed of the same constructional elements as the established contactors type P8n. Two magnet systems are inter- connected by a pivoted element. In the type PSU6n… with 6 free contacts, only one system has contacts; in type PSU14n… with 14 free contacts, both systems have contacts. In each case two contacts are required for changing over the connection of the coils.
The contacts are arranged symmetrically on both sides of the relay coil and armature assembly in two stacks. They are easily accessible and the conversion from N/C to N/O contacts and vice versa is simple. The maximum rated voltage is 250V d.c. or a.c. and the material used is hard silver. The following definitions apply for reset and operatecondition; reset condition – Armature assembly position is away from the base i.e. the upper system has been pulsed and lower system is ready to be pulsed. The flag strips are invisible i.e. white during this condition. Operate condition – Armature assembly position is closer to the base i.e. the lower system has been pulsed and upper system is readyto be pulsed. The flag strips are visible i.e. red during this condition.
A transparent, incombustible cover with a gasket protects the contacts against dirt. The terminals of the contact stacks themselves permit two wires of 1.5mm diameter maximum to be secured. The terminals on the base for the external wiring have holes with a diameter of 3.8mm. The terminals on the plug-in base can accommodate two wires, each 2 with a cross-section of 2.5mm . Changeover relays must always be mounted with the contact post horizontal, that is with the base on a vertical surface. The plug-in version offers many advantages, both from the point of view ofinstallation and afterwards for maintenance. It is fitted with locating pegs which prevent it from being inserted the wrong way round. The labelling of the terminals on the base is identical to that on the contact stacks.

ABB RXP8n Auxiliary RelayABB RXP8n Auxiliary Relay – Single Element Auxiliary Relay, Self-Reset Contacts without Operation Indicator
ApplicationThe auxiliary relays type RXP8n,RXPQ8n are used for all kinds of control and protection circuits in power stations and industrial installations, where a high degree of reliability and a high contact rating are stipulated, with minimal internal consumption. Acting as instantaneous switching element, it provides galvanic separation and contact multiplication in tripping and signaling circuits of protective relays.
Technical Specification of ABB RXP8n Auxiliary RelayType: Electro Mechanical Relay.Protection Type: Auxiliary Relay. FeaturesHigh degree of reliability, even when it has been idle for a long time7 contacts with double interruptionContact configuration can be changed with easeWide range of voltage & contact configurationsSpecial versionsRXPQ8n….. High speed locking relay with hand reset.
Design & PrincipleThe auxiliary relays in the COMBIFLEX system, type RXP8n and RXPQ8n are instantaneous plunger type relay with 7 contacts with double interruption. They are designed to operate from d.c.
The magnet system comprises a fixed core and a moving, plunger-type armature, which actuates the contact bar directly. When the coil in de-energized , the armature of the magnet and the contact bar are forced back into their initial position by spring action. The contacts are arranged symmetrically in two rows, on either side of the magnet, clearly visible and readily accessible. They are designed for a maximum rated voltage of 250V d.c. or a.c. The material used for the contact tips is hard silver.
At the most, 3 normally closed contacts are permissible which should be distributed evenly between two sides. The field weakening resistor is cut in by means of a delayed normally closed contact on a special contact bar in series with the coil. The relay type RXPQ8n is specially designed for high speed operation and mechanical latching. It has operation indicator which pops out when the relay latches. The relay can be hand reset by pressing in and resetting the operation indicator.  A transparent protective hood of material that does not burn readily provides good protection against dust. The plug-in relay module occupies two seats (2U 12C). The auxiliary relays should always bemounted with their contact bar horizontal.

ABB P8nAHX Auxiliary RelayABB P8nAHX Auxiliary Relay – X Single Element Auxiliary Relay, Self-Reset Contacts without Operation Indicator
Key benefits
Highly ReliableCompact and RobustVisual IndicationKey features
Double interruption contactsWide range of contact and voltage configurationsHand reset operationTechnical Specification of ABB P8nAHX Auxiliary RelayType: Electro Mechanical Relay.Protection Type: Auxiliary Relay. Auxiliary relays P8n,PN8nThe auxiliary relays are used for all kinds of control and protection circuits as an instantaneous switching elementThe auxiliary relays P8n and PN8n are instantaneous, auxiliary plunger type relay with 7 double interruption contacts. They are used in installations where high degree of reliability and high contact rating are stipulated with minimal internal consumption. They act as instantaneous switching element, providing galvanic separation and contact multiplication in tripping and signaling circuits of protective relays.
The P8n relay is designed for high speed operation. It has an operation indicator which pops out when the contact system picks up and relay latches. The operation indication can be reset manually. Other variant without operation indication can also be selected based on order code.
The PN8n relay is specially designed for minimum drop out of approximately 20% of rated voltage. The relay is available with operation indication which pops out when the contact system drops off. The operation indication can be reset manually.
Auxiliary relays P type product range
P8nAHX            Basic auxiliary relay with high speed operation without operation indicator with field weakening resistor and plug in baseP8nCH2J          Basic auxiliary relay with high speed operation with operation indicator with field weakening resistor with 1/2S size, flush mounting casePN8nCH2J        Basic auxiliary relay with high drop out rating with operation indicator with field weakening resistor with 1/2S size, flush mounting case
P8n PRODUCT RANGE:
The indicating relay type CV2 is an instantaneous hinged-armature relay with two contacts. These may be either two normally open contacts, or one normally open and one normally closed. The indicator can be reset simply by pressing the knob back in. Some of the other Aux relays are CV2A2J, CV2AJ, CV2D2J, and CV2DJ, P8nAHX, P8nCH2J, RXP8n

ABB RXPSU14n Bi-Stable RelayABB RXPSU14n Bi-Stable Relay – Bi-Stable Relay, Electrically Reset Contacts, With Operation Indicator
Technical Specification of ABB RXPSU14n Bi-Stable RelayType: Electro Mechanical Relay.Protection Type: Bi-Stable Relay. Features
High degree of reliability, even when it has been idle for a long timeRXPSU14n is with mechanical flag type indicator6 / 14 contacts with double interruptionContact configuration can be changed with easeWide range of voltage and contact configurationApplicationFor remote and automatic control there is often a need for contactors which have two stable contact positions, even in the dead state. This requirement is fulfilled by changeover contactors type RXPSU…n. The application of alternate control pulses to the coils cause the contacts to change from the one state to the other. If the supply is interrupted, the contacts remain in their previous position, even when the voltage is restored.
Design and principleThe bistable relays in the COMBIFLEX system, type RXPSU6n and RXPSU14n are composed of the same constructional elements as the established contactors type P8n. Two magnet systems are interconnected by a pivoted element. In the type RXPSU6n… with 6 free contacts, only one system has contacts; in type PSU14n.. with 14 freecontacts, both systems have contacts. In each case two contacts are required for changing over the connection of the coils. The contacts are arranged symmetrically on both sides of the relay coil and armature assembly in two stacks.
They are easily accessible and the conversion from N/C to N/O contacts and vice versa is simple. The maximum rated voltage is 250V d.c. or a.c. and the material used is hard silver. The following definitions apply for reset and operatecondition; reset condition – Armature assembly position is away from the base i.e. the upper system has been pulsed and lower system is ready to be pulsed. The flag strips are invisible i.e. white during this condition. Operate condition – Armature assembly position is closer to the base i.e. the lower system has been pulsed and upper system is readyto be pulsed. The flag strips are visible i.e. red during this condition.
A transparent, incombustible cover with a gasket protects the contacts against dirt. The terminals of the contact  stacks themselves permit two wires of 1.5mm diameter maximum to be secured. Changeover relays must always be mounted with the contact post horizontal, that is with the base on a vertical surface. The plug-in relay module occupies two seats (2u 12C).