| 摘要 |
1. Fault-current (F1) protective circuit breaker in the form of a wall plug, having under-voltage trip means (8) and facility for monitoring protective conductors, wherein the three conducting wires, wich extend from the pin and safety contacts (1, 2) of the plug to the terminals (5), are manually switchable in an all-polar manner by means of a push-button (7) and are guided through a master current transformer (4) jointly, but with the protective conductor in the opposite direction relative to the phase conductor and neutral conductor, said tranformer having a first secondary winding to control an electronic unit (9), which is connectable to the mains by means of the push-button (7) in a leading manner, for the electromagnetically tripping mechanism (6) of the switching contact arrangement (3) upon differential current and under-voltage, and said transformer has a second auxiliary winding which serves to connect the protective conductor simultaneously to the phase conductor and neutral conductor at the terminal end by means of a respective operating contact (23) of a spring loaded testing key (11) and by means of a preconnected resistance arrangement (12). |
