Discussion
Which of the following relays can hold its contacts in position after power is cut off?
Answer: C
A latching relay has a mechanism, magnetic or mechanical, that holds the contacts in the position they were last moved to, so they stay there even after the power is cut off. An impedance relay and a differential relay are protective relays that return to their rest position when the coil is not energised, and a reed relay also opens when the field is removed. The answer is Latching relay, option (C). Latching relays are used where a state must be held without power being applied all the time, as in lighting control and in some protection circuits.
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