| 摘要 |
A master switch 3 is provided for installation between a metered incoming electrical supply L, N and one or more electrical supply units such as consumer units 5, 6. The master switch 3 includes an isolation switch 4, e.g. an RCD, which is both manually and electrically operable. Inside the master switch there is an electronic protection circuit which has a first input arranged to receive input signals from at least one fume detector 12 installed in the electrical supply units 5, 6, and a second input to receive input signals from a room smoke detector system 8-10. The electronic protection circuit is arranged to electrically operate the isolation switch 4 in response to a signal from one of the fume detectors 12. In the event of the smoke detector system being triggered a signal at the second input operates via a time delay to produce delayed operation of the isolation switch 4. |
