Experienced same problem. Found that output tubes (1 1/2") were clogged by buildup of urine/seawater interaction. Tubes were almost closed! Back pressure caused excessive strain on pump causing higher current
draw causing ckt bkr to trip.
Solution for us: Replaced tubing; cleaned vented loop. Initiated "flush longer" policy.
Thinking about installing a timer so flushing
is auto 20 seconds or so...
This is ONE example for a timer - but pretty costly: Raritan Adjustable Timer