Technical FAQs

Ask a Question

Can a thermal-magnetic circuit breaker be field adjused to a different amperage?.

Issue:
Can a thermal-magnetic circuit breaker be field adjused to a different amperage?

Product Line:

Environment:
UL listed circuit breakers

Cause:

Resolution:
No, in almost all cases. The magnetic trip setting can be field adjusted, but the thermal setting cannot be changed.
Exceptions:  Legacy PAF, PHF, PCF breaker had replacable rating columns to change the thermal setting of the breaker.  Also, some IEC rated breakers have thermal adjustment, typically in the range of .8-1.0 of handle rating.


CTA-ID : 2033701
Was this helpful?
What can we do to improve the information ?