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This is a switch that can be changed by applying power to a terminal of the switch (such as a key card access controlled door lock), as apposed to a switch that requires an outside force to change the position (such as a standard light switch).
Additional AnswerA relay and a contactor are each examples of an 'electrically-operated switch'. Each operates on a similar principle. An 'operating coil' is used to energise or to de-energise a magnetic-operated mechanism which then either opens or closes the main contacts of the device. The operating coil may be controlled by a relatively-low voltage circuit, while the main contacts control a higher-voltage circuit.
Relays tend to make/break light-current circuits, whereas contactors tend to make/break heavy-current circuits (e.g. motors).
Wiki User
∙ 12y ago
Wiki User
∙ 14y agoA relay could be in that classification.
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