ARC EXTINGUISHING DEVICE OF AIR CIRCUIT BREAKER

摘要

An arc extinguishing device of an air circuit breaker is provided to prevent the gas from inputting to an opposite direction of a pressure outlet by installing a puffer device at a lower end of a guide arm. An arc extinguishing device of an air circuit breaker includes a movable contactor(14), a fixing contactor(16), a puffer device(100), a guide arm(17), and a slot. When the movable contactor(14) is isolated from the fixing contactor(16), the puffer device(100) partitions an arc extinguishing unit and an instrument unit by shielding an interval between the movable contactor(14) and the fixing contactor(16). The puffer device(100) is installed at a lower end of the guide arm(17). The guide arm(17) is mounted on the slot(100) which is formed at an upper part of the puffer device(100). An installation unit which is installed on the slot of the puffer device(100) is formed at a lower end which connects the puffer device(100) to the guide arm(17). A pin hole into which a fixing pin is inserted, is formed on the puffer device(100).