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Why do we have a shunt trip breaker or Isolation contactor in the enclosed Altistart ATS46 enclosed units?

It is for line isolation.
Since the solid-state switches may be incapable of completely blocking motor power should a failure occur, 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.

CTA-ID : 7442
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