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.

Opto 22 manufactures five series of solid state relays, all of which have 4,000 volts of optical isolation between the field side and control side. The company's product line includes small footprint, circuit board-mounted relays; low profile, circuit board-mounted relays; rugged relays with voltage and current options; all-plastic, quick connect relays; and relays with an integral heatsink.

Crouzet manufactures a number of solid state relay series. Solid state relay types include: panel mount AC output; DIN rail; panel mount Triac output; panel mount DC output; obsolete; three-phase panel mount; motor-reversing; and PCB mount.

Tyco Electronics manufactures high performance solid state relays, and solid state relays and input/output modules designed for industrial automation systems. The company's line of high performance relay types includes AC output (2, 10, and 25 Amp), bidirectional, and DC output (2 Amp). Tyco's family of solid state relay types includes: "hockey puck," DIN mount, miniature SIP, Amp SIP, dual AC output, and quad AC output.