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What is the meaning of a 3903 suffix on a breaker such as MHL3660033DC3903?

Suffix 3903 is a combination of a (1284) 1A/1B gold flashed auxiliary contact, and a (3900) 48VDC Under Voltage Release, with 48`` leads. The suffix also means that the breaker has the customer part number printed on the label and carton.

CTA-ID : 2035390
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