I have completed converting a 95 Acura Integra using Curtis AC-50 motor and 1238 controller. The company (which shall remain un-named) that sold me the motor and controller also sold me a 250A circuit breaker which he advised me would be a perfect compliment to my pair of 500 A fuses in the battery box(es). Even though the current rating was awfully low, the time delay before the breaker would open was evidently sufficient to allow most acceleration scenarios before opening. Well, the breaker worked fine for a couple of months and now it seems to want to pop open at random moments, even when drawing very low (or in some cases negative or charging current when using regen braking). I have since been advised that with an AC system, a circuit breaker is not necessary and not desirable, either. Can one or more of you experienced guys enlighten me? I like the idea of having a remote cable on my dashboard and have installed one -- allowing me to manually shut down the system in an emergency when none of the other safety devices (including inertial switch and two fuses) has already shut it down. I would like to put in a manual disconnect or maybe even a big toggle switch that could carry 500A of current but have been unsuccessful finding one. I have also been pretty unsuccessful in finding a bona fide DC circuit breaker that can carry that much current. IDdeas please, anyone?