Solid State Relays (SSR) are relays that have the ability to switch high voltage/current loads by means of a low control voltage. These SSR's also have no internal mechanical parts that can wear or arc, that sometimes cause failures in the mechanical relays. Crydom TD2425 is an example of a solid-state relay used in industrial circuits. The TD2425 control input is 3 volts DC to 32 volts DC that controls the isolated output 240 volts AC at 25 Amps.
Testing SSR can be done quickly by first connecting a load in series across the output side of the relay and applying dc control voltage to the input side of the relay. With the control voltage applied the output side of the relay will conduct voltage/current if the relay is operating correctly.
SSR are good relays to use in dusty or harsh environments and also where the loads have short duty cycles.
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