| 摘要 |
A switching circuit (1) for connection to a load and to a voltage source (2) is disclosed comprising one or more switching devices (6, 7, ..., n) for switching on and off power to the load, a pulldown device (4) for shorting out the load thereby isolating it from the voltage source, and a controller (3) operable while the source is isolated from the load to activate at least one of the switching devices at a time, wherein a current passes through the or each activated switching device and is measurable to test whether the or each activated switching device is operating correctly.
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