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    Why do we have a shunt trip breaker or Isolation contactor in the enclosed Altistart Softstarts (ATS23, ATS46, ATS48, ATS22)?

    Issue:
    We install either a Shunt trip breaker or Isolation Contactor when building an enclosed or MCC installed softstart.  These options are also shown in our recommended wiring diagrams in the product documentation.

    Product Line:
    Altistart 22 (ATS22)
    Altistart 48 (ATS48)
    Altistart 46 (ATS46) - obsolete
    Altistart 23 (ATS23) - obsolete

    Environment:
    All models, all versions.

    Resolution:
    This is for line isolation.
    All softstarts use SCR's to switch the voltage during operation.
    Since the solid-state switches (SCR's) may be incapable of completely blocking incoming power should a failure occur (they will almost always fail shorted), auxiliary isolation on the line-side of the controller is required.
    The isolation device must be capable of operation via command from the Fault relay of the controller.
    An isolation device consisting of either a circuit breaker incorporating a shunt trip coil or an electromagnetic contactor can be used to open the controller power circuit in the event of a controller fault.

    This prevents voltage and current from passing through a damaged SCR and single phasing the motor.

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