Description
A solid-state relay (SSR) is an electronic switching device that switches on or off when a small external voltage is applied across its control terminals. 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 to the load. It serves the same function as an electromechanical relay, but has no moving parts.
The difference between the mechanical Relays and Solid State relays can be seen in the image below
Read more Technical Explanation for Solid-state Relays here in this document.
Document:
Technical Explanation for Solid-state Relays
