Molded Case Circuit Breaker Information
Dimension (Unit: mm)
Tips: What is a Molded Case Circuit Breaker？Molded case circuit breakers are also called device-type circuit breakers. All parts are sealed in a plastic case. The auxiliary contacts, undervoltage releases and shunt releases are mostly modularized. Due to the very compact structure, the molded case circuit breaker cannot be overhauled. It mostly adopts manual operation, and large capacity can choose electric opening and closing. Due to the application of electronic overcurrent releases, molded case circuit breakers can also be divided into two types: A and B. Type B has good three-stage protection characteristics. However, due to price factors, thermal magnetic releases are used. Class A products have a higher market share. Molded case circuit breaker is the contact, arc extinguishing chamber, trip unit and operating mechanism are all installed in a plastic shell. Generally, maintenance is not considered. It is suitable for branch circuit protection switch. The overcurrent release has thermomagnetic There are two kinds of type and electronic type. Generally, the thermal magnetic molded case circuit breaker is a non-selective circuit breaker, and only has two protection methods: overload long delay and short circuit instantaneous protection. Four protection functions: time delay, instantaneous short circuit and ground fault. Some of the newly launched products of electronic molded case circuit breakers also have a regional selective interlocking function. Most molded case circuit breakers are manually operated, and some have motor operating mechanisms.