| 摘要 |
A key-operated device is situated in accommodation, such as a hotel room, and controls the electrical power supply to at least one electrical outlet in the accommodation. When a key is received in the device in an actuating position, a microswitch is caused to be actuated and connects the supply. When the key is removed from the device the microswitch is deactuated and the power supply to the electrical devices is disconnected. The microswitch is connected via a connector to the mains power supply and a fuse box for the various electrical circuits to be controlled in the accommodation. The key to operate the device is the same key as, or is securely attached to, the key required for opening the door of the accommodation. Thus, the wastage of electrical energy is prevented by ensuring that all electrical devices, e.g. televisions, heaters, lights, air conditioning units, whose power supplies are controlled by the device, are turned off when the occupant leaves the accommodation for a period taking his key with him.
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