Plastic shell circuit breaker is suitable for AC 50Hz or 60Hz, insulation voltage 800V (1000V), rated working voltage to 690V distribution network circuit, used to distribute power and protect lines and power equipment from overload, short circuit, undervoltage and other faults damage. At the same time, it can also be used as the motor's infrequent start and overload, short circuit, undervoltage protection. The circuit breaker has the characteristics of small size, high breaking capacity, short fly-arc (or no fly-arc), and the circuit breaker is installed vertically (that is, vertically), and can also be installed horizontally (horizontally), which is the ideal product for users.