The main function of the molded case circuit breaker is to provide special protection functions for overload and short circuit in the low-voltage power distribution system and the motor protection circuit. Because of its reliability and stability, it has become a very widely used product in industry.
Different models of molded case circuit breakers have different sizes. Circuit breakers are generally composed of contact system, arc extinguishing system, operating mechanism, trip unit, shell and so on.
The first 3 letters of the model of molded case circuit breaker are the serial codes NS, NSX, NSE, CVS, EZD. After the code name is the code of the switch shell frame current + switch breaking capacity, such as the NSX100N shell frame current 100A. The breaking capacity N is 50KA.
Switch pole number, release type and switch rated current such as: NSX100N3P3DTM25D NSX series, frame current is 100A, 3P3D is 3 poles, TMD is thermal magnetic tripping 25 is rated current 25A.
Molded case circuit breakers are generally used for power distribution feeder control and protection, low-voltage side outlet main switch of small distribution transformers, power distribution terminal control, and power switches for various production machinery.