| 摘要 |
The electrical circuit breaker has a main line (terminals 41, 42) to be protected, a test circuit (terminals 43, 44), a test key (2) and an electrical signalling device (49). The electrical signalling device (49) is situated in the housing (3, 4) of the circuit breaker and can be connected to the test circuit and thus activated via a switch (45, 47). This switch (45, 47) is coupled (tongue 55) to the test key (2) and is opened by pressing the test key (2). In this position the test key (2) interlocks (46, 57) with the switching mechanism (59) of the circuit breaker and is not released until the circuit breaker has been switched on again by operating the switching mechanism (59). |
