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?

This thermal circuit breaker is similar at mine

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    "adjust the screws periodically" Does Australia by any chance permit aluminum wiring? In the US, this was a symptom of using aluminum wiring with copper rated terminations. Otherwise, if the screws are actually self loosening, it indicates a poor design. – Fiasco Labs Apr 27 '14 at 16:08
  • @FiascoLabs, Argentina... 8) – TDHofstetter Aug 25 '14 at 18:04

replace like with like.

look at the print on it and see what amperage it is rated for and get one with the same rating. the one picture is a double pole breaker that will shut down both leads when either one is overloaded.

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