A Solid State Relay is an electronic switching device that uses semiconductor components, such as triacs, thyristors, or MOSFETs, to switch electrical loads on and off. SSRs do not have any mechanical components, which distinguishes them from conventional relays. Instead, the switching action is achieved through the flow of current in a semiconductor material, providing a much more durable and reliable alternative to traditional relays. The control circuit of an SSR typically accepts low-voltage DC input (e.g., 3-32V DC), which triggers the semiconductor to activate the output, controlling higher-power AC or DC loads.