| 摘要 |
A circuit breaker/disconnector apparatus for a power delivery system comprises a unidirectional DC circuit breaker 20 having first and second terminals 21, 22 configured to automatically open during an overcurrent condition in a forward direction and to remain closed independent of current level in a reverse direction. A disconnector switch 10 in series with the circuit breaker has a first terminal 11 for connecting to a first polarity connector 2 of a power supply 1, a second terminal 12 for connecting to a second polarity connector 3 of the power supply and a common terminal 13 connected to the first terminal of the circuit breaker. The disconnector switch has at least a first position in which the first terminal is connected to the common terminal and a second position in which the second terminal is connected to the common terminal. The power supply may be for use with a transport system such as a railway or tramway. The apparatus can be used to safely ground a normally live cable or third rail when in a maintenance condition. |
