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What is the difference between HACR rating and Fed. Specs W-C-375B/GEN?

Fed. Spec. W-C-375B/GEN tells us that the breaker is 600V or less, 4000A or less, meets UL489, and is suitable for a variety of applications. It is very general. HACR is a rating for breakers serving heating air conditioning, and refrigeration loads. The two are really not related.

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