Yes, it can be used circuit breaker with undervoltage trip.
In case of fault the soft starter will interrupt the signal on the breaker undervoltage trip through a relay output, with consequence interruption of the current flow to the motor. But contactor it is preferable due to its high mechanical durability compared with circuit breaker which is used for protection purpose not switching.
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Other information on this topic
Visit the website page dedicated to contactors. Check out our video on BF series
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Visit the website page dedicated to ADXL… series soft starters and check out related videos
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