Molded case circuit breaker is also known as device type circuit breaker. All parts are sealed in a plastic shell. The contact, arc extinguishing chamber, release and operating mechanism are installed in a plastic shell through modularization. Generally, maintenance is not considered. It is applicable to the protection switch of the branch. The overcurrent release has two types: thermal magnetic type and electronic type; The arc extinguishing plates of the arc extinguishing chamber in the structure mostly use thin plates and arc resistant GPO-3 to play a protective role.
