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This is a listing of Solid State Relay manufacturers and vendors. The listing is subdivided into Mechanical Relay, and Solid State Relays.
The types of products or devices they produce are listed under the company name, in alphabetic order.

Solid State Relay Manufacturers 'SSR'

A Solid State Relay consists of semiconductor devices mounted on a printed circuit board ~ encapsulated in plastic.
Its main characteristics are resistant to high voltage and high current, contactor-less (no noise), good isolation and ease of heat evaporation.
Solid State relay are also available in all the same contact styles [forms] as mechanical relays.

Semiconductor Component Vendors:

American Zettler, Inc. {General Purpose/Automotive-HVAC-Power-Telcom}

Amperite {Miniature Solid State Relay-Time Delay Relays}

Celduc Group {Solid State Relays}

Clare {1-Form-A, 1-Form-B, 2-Form-A, 1-Form-C}

Comus International {Solid State Relay - SSR Module Boards}

COSMO Electronics Corp. {4-pin SIP/Panel Mount Solid State Relay-SSR MOS output relays}

Crouzet {Solid State Relays; EMC-compatible, waterproof, I/O Modules/Mounting Boards}

CRYDOM {Solid State Relays, DIN Rail Mount, Panel Mount, PCB Mount}

Dionics Inc {Power MOSFET Photovoltaic Relay Manufacturer}

International Rectifier {Photovoltaic Relay, Photovoltaic Isolator}

Micropac Industries Inc. {Solid State Relay 'SSR' - Solid State Power Controller 'SSPC' Manufacturer}

NTE Electronics Inc. {Solid State Relay Manufacturer, Opto Isolated, Compatible with TTL Gates, AC and DC Models}

Omron Electronics Inc. {PCB-Low Signal-MOSFET-Solid State Relays}

Phoenix Contact {Rail Mounted Solid State Relay Modules}

Power-IO {Solid state relays, SCR thyristors, solid state contactors, IGBT based relay switching}

Schneider Electric {Solid State Relays (SSR): 2.5 to 125 Amperes, Commercial-Military}

Solid State Optronics Inc. {Optically isolated Relays - MOSFET/SCR output}

SSAC Inc. {Time Delay Relay Manufacturer}

Teledyne Relays
{Commercial/Military-AC/DC/Bi-Direction Output Solid State Relays}

{Relay Manufacturers Index}

Solid State Relays [SSR] are bounce free, switch faster than mechanical relays, and have no moving parts. In most cases an opto-isolator is used to control a FET which would control the switching current. A solid state relay incorporates semiconductor or passive circuit devices. A Solid State Relay contains no moving parts, and therefore has low switching noise and essentially no bounce or chatter. Solid state relays also have long life and fast response times. Their main disadvantage is a limited number of applications for which they can be used. Solid state relays are typically not used in high temperature environments.

ElectroMechanical Relay [EMR] is an electromagnetically-operated switch. An actuating current on a coil operates one or more galvanically separated contacts. This type of relay must make mechanical contacts in order to switch a load. These contacts are prone to oxidation breakdown, and bounce. However Reed relays are hermetically sealed and do not suffer from oxidization as much as open contact mechanical relays do.

Reed Relay Contacts are made from a ferromagnetic material (reed) which are encapsulated in glass. An energizing coil is wrapped around the glass and an EMF brings the two reeds together, closing the contacts. There are two types; Dry or Wet. Both types are identical except a Wet Reed relay has a small amount of mercury added inside the glass tube, providing a more consistent contact resistance.

Forms:
.. Form A: Normally open, when the relay is energized the circuit is completed [SPST, or DPST]
.. Form B: Normally closed, when the relay is energized the circuit is open [SPST, or DPST]
.. Form C: Two position [SPDT]

Neutral: The transition from one switching position into another is independent of the direction of excitation Polarized: The transition from one switching position into another is dependent on the direction of excitation Monostable: The transition to one switching position due to an input excitation, only last while the input excitation is present, once the excitation is removed the relay returns to it's original position. Bistable: The transition to one switching position due to an input excitation, once the excitation is removed the relay does not return to its original position. The relay requires another excitation to return to its original position

Relay Contact Styles

MIL-PRF-28750; Relays, Solid-State, General Specification
MIL-PRF-83726; Relays, Hybrid and Solid State, Time Delay, General Specification

A listing of Solid State Relay manufacturers and vendors. The listing is sub-divided into either mechanical relay manufacturers or solid state relay manufacturers. The types of products or devices the manufacturer produces are listed under the company name, in alphabetic order. Additional component manufacturers may be found by selecting the Components icon below, or Equipment manufacturers may be found by selecting the OEM Equipment icon.

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