Crydom is a manufacturer that focuses solely on solid state relays. The company's product line includes a number of solid state relays including: control relays, DIN rail mount, panel mount, PCB mount, PCB mount 16 Pin DIP, and PCB mount mini-sip.

Teledyne is a manufacturer of solid state relays for the power, military and aerospace industries. The company's line of power solid state relays includes: DC output, single-phase AC output, dual output AC, three-phase, and quad output AC. Relays intended for military and aerospace applications include DC solid state relays, bi-directional solid state relays, and AC solid state relays.

AMETEK is a manufacturer of solid state relays, compact solid state relays, and plug in-style solid state relays. The compact and plug in models are for use in constricted installations typically found in dispensing machines and coffee markers. The company's solid state relays are for use in food, drug and chemical processing applications.