I'm trying to understand my power pole pump wiring issues a little better. I'm not an electrician and don't understand why my pumps are wired this way and why the fuses are blowing. I have received a suggestion to move my in line fuses to the pump side of the circuit in the diagram below, but I don't understand why that would resolve my issue.
Issue: When I operate both my poles at the same time, both of my 40 amp in line fuses are blowing at the same time. When I operate the poles individually, they do not blow. The diagram below is a quick representation of the current wiring. Both pump hot wires are running through a single 50 Amp Circuit Breaker.
Why would moving the fuses to the pump side of this diagram make a difference?
Should the circuit breaker be rated at 80 amps instead of 50 amps?
Why wouldn't the 50 Amp circuit breaker trip before the 40 Amp fuses blow?
I'm going to use a jumper to take the circuit breaker out of the equation. Each pump should then be able to pull 40 Amps like they need. If jumping across the breaker resolves the issue, I can get an 80 Amp circuit breaker. I would just like to understand why the fuses blow before the breaker trips.