Circuit breaker

A circuit breaker, comprising a circuit breaker housing;

• and a button mechanism, an operating mechanism connected with said button mechanism, a movable contact connected with said operating mechanism and a static contact co-operated with said movable contact are all arranged in said circuit breaker housing;
• wherein operating said button mechanism enables the circuit breaker to switch on/switch off by means of said operating mechanism;
• the circuit breaker further includes an electric mechanism arranged inside said circuit breaker housing, said electric mechanism is drivingly co-operated with said button mechanism or said operating mechanism, said electric mechanism can actuate the circuit breaker to switch on/switch off by means of said operating mechanism, or said electric mechanism can actuate the circuit breaker to switch on/switch off by means of said button mechanism, wherein the circuit breaker further includes a short-circuit protection mechanism and an overload protection mechanism respectively drivingly co-operated with said operating mechanism, arc extinguishing system, a wire-inlet terminal and a wire-outlet terminal, which are arranged in the circuit breaker housing respectively;
• said wire-outlet terminal and said button mechanism are arranged at one end of said circuit breaker housing, and said wire-inlet terminal is arranged at another end of said circuit breaker housing;
• said operating mechanism is positioned between said button mechanism and said wire-inlet terminal;
• said arc extinguishing system and said short-circuit protection mechanism are arranged side by side between said operating mechanism and said wire-inlet terminal;
• said electric mechanism is positioned between said operating mechanism and said wire-outlet terminal, and said electric mechanism and said wire-outlet terminal are positioned on a same side of said button mechanism;
• said overload protection mechanism is positioned on one side of said operating mechanism and between said arc extinguishing system and said wire-outlet terminal.