NM10 series plastic case circuit breaker (hereinafter referred to as circuit breaker) is mainly used in the circuit of distribution network with 50Hz frequency, rated working voltage up to 380V and rated current up to 600A. It is used to distribute electric energy and protection circuit and The power supply unit is protected from damage such as overload, short circuit, and under voltage. Circuit breakers of 250A and below can also be used as infrequent starting and overload, short circuit and under voltage protection of the motor. This series of transparent shell-type circuit breakers, the cover is made of new, high temperature resistant, high-strength polycarbonate material, which can intuitively judge the on-off state of the contacts, and is widely used in temporary power installation sites. Meet the standards: GB 14048.2, IEC 60947-2.