One advantage of solid-state relay (SSR) over conventional electro-magnetic relay (EMR) is its tear and wear free operation. S201S01 from Sharp is a good example. Here is the circuit diagram of a DIY ...

Electronic relays have evolved a lot since their introduction in the early '30s, but their basic purpose hasn't changed. Transistors and integrated circuits have replaced vacuum tubes and the term ...

Another type of SSR, called a ‘random turn on’ solid state relay, is used to implement dimming. It works the same way as a normal SSR, except that there is no zero-crossing detection circuit.

Two main types of these relays exist: electromechanical relays (EMRs) and solid-state relays (SSRs). EMRs have been the tried and ready solution for managing load circuits.

As said previously, the key characteristic of a solid-state relay is that it needs no moving parts to perform the task of opening or closing contacts on a circuit. Unlike an electromechanical relay, ...