Ground fault circuit-breaker for low-voltage distribution network, has body switched to non-conducting state by actuator, and button locked to retain bar in release position under effect of push-turn operation on button installed in cover

摘要

The circuit-breaker has a megohmmeter testing switch (18) installed in an enveloped case. The switch has an assembling unit including an actuator (21) with an end connected to an actuating rod of a switch body (20) and another end contacting a transversal triggering bar (15) of a circuit-breaker opening/closing mechanism. The body is switched to a non-conducting state by the actuator, and a push button (19) is locked in position to retain the bar in a lock release position under an effect of a push-turn operation on the button. The button is installed in a cover (12b) of the case. The switch is installed in a cavity type space arranged between a zero phase current transformer and a lateral wall of the enveloped case.