My well pump is fed by a 40a 240v circuit. I noticed that sometimes when the power cycles, or I manually cycle the breaker, that the circuit is only getting 120v. If I flip the breaker a few more times this resolves itself. Do I need a new breaker, or is this likely something else?
Electrical Circuit – Two Pole Breaker for 240v Circuit Issue
circuit breakerelectrical
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Best Answer
Almost certainly a bad breaker. Square D Homeline is the cheaper model than the QO breakers, but you'll have to replace it with another Homeline breaker since the QO breakers won't fit in a homeline panel.
BTW, I noticed that you are running 10ga wire. That isn't rated for 40 amps. And to be running 40 amps to a pump, it must be a heck of a big pump. What's it being used for? Commercial irrigation?
Also, it may be a loose connection someplace, like the wires themselves or the feed to the panel.