| 摘要 |
The circuit breaker has a sum current transducer (3), a magnetic trip device (5) and a switch mechanism (4) with main current contacts (4.2, 4.3) for the network lines (1, 2). The fault current response threshold of the circuit breaker and its response time are determined at intervals via a current signal generator (14), a current sensor (15), a timing signal generator and an electronic timer (20). The measured response threshold and response time are compared with stored values, to activate a real-time alarm when the measured values are outside the acceptable range and/or with a blocking device (12) preventing opening of the main current contacts during the measurement opening the contacts and preventing them from being re-closed. -
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