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    Is a line isolation contactor or shunt trip circuit breaker needed with Schneider Electric ATS48 Soft Starters?

    Issue:
    Is a line isolation contactor or shunt trip circuit breaker needed with Schneider Electric ATS48 Soft Starters?

    Product Line:
    Altistart 48 Soft Starters

    Environment:
    All

    Cause:
    Need to know whether a contactor or breaker needs to be used

    Resolution:
    Since the solid-state switches may be incapable of completely blocking the motor power should a fault occur, auxiliary isolation on the line side of the controller is required. Use either a circuit breaker equipped with a shunt trip coil or an electromagnetic contactor. Connect the isolation device to the fault relay of the controller so that it opens the controller power circuit in the event of a controller fault. The isolation device must be capable of interrupting motor locked rotor current.


     

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