GAS CIRCUIT BREAKER USING SPIRAL SPRING AS AN OPERATIONAL FORCE GENERATOR

PURPOSE: A gas circuit breaker is provided to generate high operational forces and allow for easy maintenance by using a spiral spring as an operational force generator. CONSTITUTION: A gas circuit breaker comprises a lever(2) mounted on a trip shaft(3) in such a manner that the lever is rotatable; an open spring(1) having an end coupled to the lever and the other end fixed to a housing(30) in such a manner that the open spring is compressed to rotate the lever in a clockwise direction; a main lever(5) gear engaged with a trip shaft in such a manner that the main lever is rotatable by the open spring; an open latch(8) mounted with a roller(9) and arranged on a shaft(8a) in such a manner that the open latch is rotatable; a trap latch(10) having a stopper(10a) for limiting clockwise rotation of the open latch; a spiral spring(17) having an end fixed at an injection shaft(18); an injection cam(19) arranged in the injection shaft; a close latch(21) having a roller(20) contacting the front end of the injection cam; an injection latch(23) having a stopper(23a) for limiting clockwise rotation of the close latch so as to maintain a balance between the close latch and the injection cam; a motor(13) for generating driving forces; a gear box(14) coupled to the rotating shaft of the motor so as to reduce driving forces; and a spur gear(15) for transmitting the driving force output from the gear box to a spur gear(16) in such a manner that the spur gear(16) rotates in a clockwise direction.