Circuit breakers are manufactured for a particular rating at 40 degrees C(104 F), beyond that the capacity is de-rated. At an ambient temperature of 105 F it is not unheard of to get road surface temperatures of 140 F or more. With the circuit breaker located in an enclosed generator housing and with the generator running, temperatures in the housing can easily get to 140 – 150 deg. F. At those temperatures a 60 amp breaker is de-rated to 52 amps or a 40 amp breaker de-rated to 34 amps.
2007 Newmar DSDP 4023
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