I have 60 amp circuit breaker on my electrical a/c heater with a 45 amp fuse. I had the unit for 7 years with no problem. This month the 60 amp circuit breaker keeps tripping when the heater goes off. The 60 amp circuit breaker does not trip all the way. Do you think I have a bad circuit breaker? Shouldn?t the 45 amp fuse blow before the 60 amp breaker trips.

You're unit is a 31/2 ton according to the numbers.Normally, breakers will only be in a half way posistion when tripped. Yes, under most conditions, the fuse will blow before the breaker trips. I have seen this many times, the breaker may be weak, burned, loose wires and so tighten wires, check the condition of the breaker.It sounds like the breaker even though it is 60 amps, is the problem and you should replace it with out hesitating. This will solve you're problem. When you pull the breaker out, look at the metal clips that snap in on the buss bar to see if they have been overheating.And the buss bar its self. You will know. I am sure this will take care of you're problem. Good Luck,
Shastalaker7