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A relay which is used as a switch has moving contacts mechanically linked to an armature which when a low current is supplied to the coil, the resulting magnetic field attracts the armature, which closes(or opens) the circuit(s). When the coil is switched off the armature is returned by a force approximately half as strong as magnetic force to its relaxed position, breaking the circuit.
Relays can have several isolated sets of switches operated by the one armature, thus several circuits can be switched at the same time. There are many types or relays - some are intended as "signal relays" and are used to direct audio or instrumentation signals, others as power relays, switch high currents or voltages. A specialist version of a power relay, known as a contactor, is frequently used in 3-phase power systems.
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∙ 13y ago
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∙ 11y agoExpanding metals.
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What is an impedance relay?
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