Control Auxiliaries

Control and Indication Contacts Installed Outside the Circuit Breaker

Control and indication contacts installed outside the case are contacts for specific applications. Refer to LVPED217032EN, ComPact NSX & NSXm Catalogue.

CAM contacts

Early-operation contacts

Install in the rotary handle:

Early-make contacts (CAF1, CAF2) actuate before the poles close when a circuit breaker manual command is given.
The early-break changeover contact (CAO1) actuates before the poles open when a circuit breaker manual command is given.

Carriage switches

Connected (CE)/Disconnected (CD) carriage switches

Install on the chassis to indicate the position of the circuit breaker in the chassis:

A Connected position carriage switch (CE)

B Disconnected position carriage switch (CD)

Operation of connected/disconnected carriage switches

CE Connected position carriage switch

CD Disconnected position carriage switch

Voltage Trip Releases

Use voltage trip releases to trip circuit breakers deliberately using an electrical signal. Install these auxiliaries in the case under the front face.

The characteristics of these auxiliaries comply with the recommendations of the standard IEC/EN 60947-2.

MN undervoltage trip release

This release:

Trips the circuit breaker when the voltage is less than 0.35 times the rated voltage Un. If the voltage is between 0.35 and 0.7 times the rated voltage Un, tripping is possible but not guaranteed. Above 0.7 times the rated voltage Un, tripping is impossible.
Closes the circuit breaker again once the voltage reaches 0.85 times the rated voltage.

Use this type of trip release for fail-safe emergency stops.

Time-delay unit

Time-delay unit for MN undervoltage trip release

The time-delay unit eliminates nuisance tripping of an undervoltage trip release due to transient voltage dips lasting < 200 ms.

There are two types of time-delay units: adjustable or fixed.

MX shunt trip release

This release trips the circuit breaker when the voltage exceeds 0.7 times the rated voltage Un.

For more information about installation, consult the instruction sheet on the Schneider Electric website: NNZ4291701, MN or MX Voltage Releases.