Pool pump breaker keeps tripping

https://www.youtube.com/watch?v=wqWn5tY0lO0
So how come your pool pump keeps tripping breaker in the first place? It may be because of four reasons: Your circuit breaker is short circuiting from the water or corrosion collected by the pool pump. Debris from the rain goes into the housing, making the motor overwork.
https://www.poolcleanerblog.com/pool-pump-trips-breaker/

Get a new electrician! The pool pump should be on its own isolated circuit, usually on no larger than a 30 amp GFCI protected breaker. You said it was replaced but he only treated the symptom, not the cause. This one will take on site troubleshooting to find out why your whole house is affected.

Breakers are mechanical parts and can fail. If none of your components are causing the breaker to trip it's the breaker itself.

Assuming you have Paragon 4001 40 amp 120Volt timer
By-pass the timer so only pool pump is connected to breaker.
To do this, move wire from terminal 2 and connect to terminal 1.
If breaker no longer trips, then replace timer with Intermatic T101
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html#T101
Crossover wiring: Paragon terminal 1 goes to Intermatic terminal 1.
Paragon terminal 2 to Intermatic terminal 2.
Paragon terminal 3 to Intermatic terminal A
If breaker keeps tripping after bypassing timer, then tighten wires on circuit breaker and test again.
If breaker keeps tripping, then move wires to another same-size breaker.
http://waterheatertimer.org/How-to-replace-circuit-breaker.html
Breakers trip when they sense overheating.
If motor is causing problem, you might need electrician to track down source of overheating.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Water sprayed on the pump occasionally shouldn't hurt it but it might cause a ground fault circuit interupter (GFCI) to trip. If you turn on the pump and literally nothing happens then most likely the the GFCI has tripped. If it hums then this is a different issue. If you have a volt meter you can open the timer box and check whether power is available to the timer. If no power is available in the timer then it confirms that the pump is probably ok. Checking your circuit breaker panel for a tripped breaker or finding a tripped GFCI then either one can be reset and your pump will probably run without a problem.

I hope this helps.

I would try a different breaker.

I've had a problem like this. Can you safely power the pump from a non gfi outlet for a while? Once it runs and whatever is causing this condition dries out, you can plug it back into the gfi.
Gary

two main reasons breaker trips is the pump motor jammed [not turning]or the heater shorted out --disconnect power open access panel disconnect the lines to the heater turn on power if breaker trips than motor /pump problem if doesnt trip than heater problem can order heater replacement online or pool spa store--if motor pump check pump for debris and motor for lube if u can turn shaft or impeller oil motor and work it into bearings if still not turning possible need to replace motor unit

GFI devices are prone to degrade over time. Also, when used outdoors there are additional moisture issues that may cause sufficient current leakage to trip the breaker.

I had a similar problem this Spring. I was using a 20 amp GFI "master" outlet that protected two additional outlets 'downstream' of it (wired to the 'load' terminals on the GFI outlet- I'd have the check the doc. to see what terminology was used here). The pump was plugged into one of the downstream outlets.

Replacing the GFI seemed to solve the problem. I did ante up $20 for an 'outdoor' model of the 20 amp GFI unit, several bucks more than the standard 'indoor' unit - have no ideal if that represented additional value or not.

Note also, that this is the third such pump I have used for my pool cover. The other two failed to come on at all after about a year's use. The mfg replaced them under warranty (I may have had to send back the old pump - I forget!).

Curtis