Circuit breakers trip due to heat. Degradation of the metal occurs over time. Motors and heating
elements have a ramp
, which is usually the rated amperage used to heat up the element and start the motor
. Once it achieve operating temp and speed, the amperage drawn is reduced. It's possible the ramp
up just isnt long enough to trip the breaker. The inductive load of the microwave is continuous.
Lastly, circuit breakers should be selected based upon 75% of intended load, and wire sized to match 125% of the load. So, if you intend to run 20 amps, circuit breaker should be a 25 amp, and wire should be rated to handle 30. Or there abouts. This is because of the heat coefficient. Not at home... In the desert, so the numbers are just examples.
Sent from my SM-N920V using Cruisers Sailing Forum mobile app