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What is the replacement part number for a 1 pole miniature QB branch breaker for an NQB Panelboard?
Issue:
What replaces 1P QB Branch breaker in an old NQB panelboard?

Product Line:
Legacy Circuit Breakers

Environment:
Applies tominiature 1 pole QB frame breaker 15-50 A 120/240 V

Resolution:
There were two versions of the NQB panel:

The NQB panel built from 1947 to 1950 used the ML Series branch breakers.
The NQB panel built from 1950 to 1958 used QB type 3 3/4 in long branch breakers.
Both panels and branch breakers are obsolete, no longer available with no viable replacement. Will have to look at replacing the panelboard.

Schneider Electric USA

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