The all-electronic structure of solid state relays endows them with considerable advantages in relation to electro-mechanical relays.  Main Reasons for Using a Solid State Relay Relay Life Used properly, the most important features of the solid state relay are its reliability and its lifetime. In practice, the outputs of an SSR last practically for ever, while
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What are the basic technical differences between an SSR and an EMR? Operating Mode An electro-mechanical relay can only switch a load in asynchronous mode: the output contact switchover is controlled solely by the control signal without any particular relationship in time with the power signal. In a solid state relay, switching can be synchronised
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