Compared with an electromechanical relay, a solid state relay (SSR) is a relay without mechanical movement and no moving parts, but it has essentially the same function as an electromechanical relay. SSR is a non-contact switching element composed entirely of solid-state electronic components. It uses the point, magnetic and optical characteristics of electronic components to complete the reliable isolation of input and output. It uses high-power transistors, power field effect transistors, and single-phase thyristors. And the switching characteristics of devices such as bidirectional thyristors, to achieve non-contact, non-sparking on and off the controlled circuit. 

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