A signal at both the maximum switching voltage and the maximum switch current will generally exceed the power rating of the relay.
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The circuit that powers the electromagnet s coil is completely separate from the circuit that is switched on or off by the relay s switch so it s possible to use a relay whose coil requires just a few volts to turn a line voltage circuit on or off.
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Some users ignore the power rating but this specification has a major impact on relay life.
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For example a relay with a 60w power rating may have a maximum switching voltage of 250v and a maximum switch current of 2a.
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A single momentary input voltage switches these relays and locks them in position so they don t require a constant input voltage to stay on or off.
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Enclosed ac dc power relay with protection de bounce.
Sequenced latching relays these relays switch through a series of different circuit configurations every time they receive an input voltage.