The utility model provides a circuit breaker, including the casing that adopts insulating flameresistant material to make, both ends are equipped with a plurality of wiring holes respectively about the casing, in the downthehole binding post that is equipped with of wiring, and in being equipped with the circuit breaker main part of arranging the casing in between the binding post of both ends be equipped with a plurality of pilot lamps corresponding to binding post on the casing, still be equipped with the earthing terminal on the casing, pilot lamp one end is connected on a binding post through current -limiting resistor, and the other end of pilot lamp is connected the earthing terminal. Each binding post of circuit breaker be connected with the pilot lamp, can instruct the electrified situation of each terminal, when taking place to open circuit, be convenient for find out off position, judge that the circuit breaker trouble still is binding post deal with way, has improved the circuit breaker result of use.