[Newbie7749]

Disconnect the wire to the pump and see if it trips when you turn on the switch. If It does then you have a short somewhere between the switch and pump. If it doesn't then it is probably the pump bad.
Does the float switch still work or does it trip when activated as well?

Thanks for this. I disconnected the pump (thankfully it had a wire harness so was easily disconnected) and the switch no longer trips the breaker. Looks like the pump is bad and will be replaced.