| 摘要 |
This earth-leakage circuit breaker is constructed by installing, inside a case (12), main circuit contacts, a contact opening/closing mechanism, a zero-phase current transformer (19) which is provided on the main circuit in an intervening manner, an earth-leakage tripping unit (21), an arc-extinguishing unit (18), a printed board (22) on which circuit components for an earth-leakage detection circuit and an earth-leakage test circuit are mounted, and a pushbutton-type test switch (25) which is connected to the earth-leakage test circuit. Additionally, an internal unit (29) that internally contains the printed board (22) is housed inside the case (12), and an arc gas generated by the arc-extinguishing unit (18) is prevented by the internal unit (29) from coming into contact with the printed board (22). |
