| 摘要 |
A circuit breaker (2;2';2") for an electric load (4) includes first (12,14,16,26) and second (18,20) terminals; a number of first separable contacts (48;48') each electrically connected between one of the first terminals and one of the second terminals; a first mechanism (50) to open, close or trip open the first contacts; a number of second separable contacts (24;24') each electrically connected in series with a corresponding one of the first contacts; a second mechanism (44) to open or close the second contacts; a processor (68) to cause (200) the second mechanism to open or close the second contacts, annunciate through one of the second terminals a power circuit electrical parameter for the electric load, receive from a number of the second terminals a confirmation from or on behalf of the electric load to cause the second mechanism to close the second contacts, and determine (500) a fault state operatively associated with current flowing through the second contacts. |
