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What is the meaning of the suffix on PJA frame breakers ending in CU31A or CU44A?

Product Line:
Circuit Breaker
PowerPact P

Electrical Distribution Equipment

The C indicates 100% rated. U31 indicates a standard 3.0 Micrologic trip unit with Long-time and instantaneous functions. U44 indicates a 6.0 Micrologic Ammeter trip unit with long-time, short-time, instantaneous and ground fault functions. "A" indicates type A adjustable rating plug.
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