A control and protection switch belongs to the technical field of a low-voltage electrical appliance. The control and protection switch comprises a base, a circuit breaker, a contactor, a connection module and a surface cover, wherein the circuit breaker, the contactor and the connection module are fixed on the base, the surface cover covers a part above the connection module, the connection module is arranged between the circuit breaker and the contactor and comprises a connection bar, a current transformer and a shell, the shell is fixed with the base, the connection bar is arranged on the shell, one end of the connection bar is connected with the circuit breaker, the other end of the connection bar is connected with the contactor, the current transformer is arranged on the connection bar in a penetrating way, the connection bar and the current transformer are in a shielding state by matching of the surface cover and the shell, a heat dissipation passage is formed in the control andprotection switch, one end of the heat dissipation passage passes through the connection bar and is led to the exterior of the control and protection switch through the bottom of the connection module, and the other end of the heat dissipation passage is led to the exterior of the control and protection switch through the top of the connection module. By the control and protection switch, the temperature rising of the connection bar is reduced, and the influence of high temperature on the current transformer is prevented.