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Why would a shorting contactor have a lower amperage rating than the motor being used?

Published date: 13 June 2019

Issue:
Why would a shorting contactor have a lower amperage rating than the motor being used?

Product Line:
Altistart Soft Starters with shorting contactors

Environment:
All

Cause:
NA

Resolution:
Shorting contactors are usually derated by one size unless you have the full voltage bypass option. This is because the shorting contactor pulls in after the motor is up to full speed from being ramped up by the Soft Starter. So the full amperage rating is not needed since the contactor is not ramping the motor up from zero. However, if you're using a full voltage bypass, the shorting contactor needs to be matched up with the motor amperage.

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