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What does suffix 3901 mean on an MHL368003901 breaker?

Product Line:
Circuit Breakers

Electrical Distribution Equipment

The suffix is a factory installed addition of accessories on the breaker. The 3901 suffix includes: @2A/2B gold flashed auxiliary contacts, 48VDC Under Voltage Release option, 48`` leads, control wire lugs, and customer`s p/n printed on label and carton of the breaker. A breaker with this suffix is UL approved.
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