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A solid state relay (SSR) is an electronic
switching device that switches on or off
when an external voltage (AC or DC) is applied
across its control terminals. It serves the same function as an electromechanical relay, but has
no moving parts and therefore results in
a longer operational lifetime. SSRs consist 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 coupling mechanism to enable the control signal to activate this switch without mechanical parts. The relay may be designed to
switch either AC or DC loads.
