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 ...

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.

Excel Cell Electronics (ECE) ESR5 series of solid-state relays are available with or without LED Indicators, with ac or dc control inputs, and, separately, with ac or dc-type outputs. “Characteristics ...

First off, here’s a proven design of an adaptable solid-state relay (3~32V DC control input → 230V AC switch output): At this point, note that zero-crossing SSRs are widely used when a simple on/off ...