Low voltage circuit breaker or automatic air switch automatically called air circuit breaker, a low-voltage distribution networks and electric drive system commonly used in electrical power distribution. It combines a variety of control and protection functions in one, under normal circumstances can be used to frequently turn on and off operation of the motor and the control circuit. When a short circuit, overload and fault loss of pressure, can be automatically cut off the fault circuit, the protection circuit and electrical equipment.

Low voltage circuit breaker having a safe operation, easy to install, reliable, the operation is adjustable, high breaking capacity, taking into account a variety of protection, without having to change the operation member, etc., so widely used. The model defined as follows: