I live in a small house in Argentina where we use 220 volts. I have a thermal circuit breaker that do squeak noises when the iron starts or the fridge starts. I adjusted the four screws of the breaker but I saw it was broken. When I adjust one of the screw, it separate the plastic thermal circuit breaker. I would like to know why I have to adjust the screws periodically. I want to replace the circuit breaker because this breakage: what features should has the new one?