What is a molded case circuit breaker? Plastic case circuit breaker manufacturer Wenzhou Ruirui tells you the following.

Moulded case circuit breakers, also known as device circuit breakers, have all parts sealed in a plastic housing, and the auxiliary contacts, undervoltage derailleurs and sub-excitation derailleurs are mostly modular. Due to the very compact structure, the moulded case circuit breaker is basically impossible to service. They are mostly manually operated, with a large capacity option of electric division. As a result of the application of electronic overcurrent deregulators, moulded case circuit breakers can also be divided into two types, Class A and Class B. Class B has good three-stage protection characteristics, but due to price factors, the market share of Class A products with thermomagnetic deregulators is higher. Plastic case circuit breakers are contacts, interrupters, release devices and operating mechanisms are installed in a plastic housing, generally do not consider maintenance, suitable for use as a branch circuit protection switch, overcurrent release devices have thermal magnetic type and electronic type two, general thermal magnetic type molded case circuit breaker for non-selective circuit breakers, only overload long delay and short-circuit instantaneous two types of protection, electronic type molded case circuit breaker overload long delay, short-circuit short delay, short-circuit instantaneous and ground fault four protection functions. Some of the newer electronic molded-case circuit breakers also come with area selective interlocking function. Most of the moulded case circuit breakers are manually operated, some of them also have a motor operating mechanism.