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    ETSNZ - What indication contacts are available for NSX MCCBs?

    A single type of contact (29450) provides all the different indication functions:

    OF (ON/OFF) indicates the position of the circuit breaker contacts

    SD (trip indication) indicates that the circuit breaker has tripped due to:
    an overload
    a short-circuit
    an earth fault (Vigi) or a ground fault (Micrologic 6)
    operation of a voltage release
    operation of the "push to trip" button
    disconnection when the device is ON.

    The SD contact returns to de-energised state when the circuit breaker is reset.

    SDE (fault-trip indication) indicates that the circuit breaker has tripped due to:
    an overload
    a short-circuit
    an earth fault (Vigi) or a ground fault (Micrologic 6)

    The SDE contact returns to de-energised state when the circuit breaker is reset.

    SDV indicates that the circuit breaker has tripped due to an earth fault.

    It returns to de-energised state when the Vigi module is reset.

    All the above auxiliary contacts are also available in "low-level" versions capable of switching very low loads (e.g. for the control of PLCs or electronic circuits).

    Rotary-handle position contact for early-make or early-break functions

    CAM (early-make or early-break function) contacts indicate the position of the rotary handle. They are used in particular for advanced opening of safety trip devices (early break) or to energise a control device prior to circuit-breaker closing (early make).

    Chassis-position contacts

    CE/CD (connected/disconnected) contacts are microswitch-type carriage switches for withdrawable circuit breakers.

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