A solid-state relay (SSR) is an electronic switching device that switches conduction states when a small external voltage is applied along its n-type and p-type junctions. SSRs consists of a sensor which responds to an appropriate input (control signal), a solid-state electronic switching device which switches power to the load circuitry, and a co...
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http://en.wikipedia.org/wiki/Solid-state_relay
electrical relay in which the intended response is produced by electronic, magnetic, optical or other components without mechanical motion
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=444-01-06
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