Solid state relay
A solid state relay provides isolation between a control circuit and a switched circuit and may replace an electromechanical device such as a reed relay. Solid state relays have been widely utilized in place of mechanical relays in view of many advantages including miniaturized configuration, low-energy consumption, and high speed switching performance. A solid state relay has all its components made from solid state devices and involves no mechanical movement. They are compatible with digital circuitry and have a wide variety of uses with such circuits. A solid state relay is usually configured so that an input circuit and an output circuit are electrically insulated from each other by a photocoupler, and a main switching element interposed in the output circuit is operated in accordance with an electric signal applied to the input circuit, thereby closing or opening a load connected to the output circuit. A typical solid state relay consists of a light emitting diode (LED) optically coupled across an electrically isolating gap to a photodiode array. The photodiode array is electrically connected to a output device such as a field effect transistor (FET). Field effect transistors used for power switching use are usually enhancement mode types. When a gate voltage above a threshold is applied, the FET becomes conducting. FETs are available in two gate polarities; N channel and P channel.
Solid state relay product listings
Clare, an IXYS Company, designs, manufactures, and markets high-voltage integrated circuits (ICs) and optically isolated solid state relays (OptoMOS®) for the communication, industrial, power, and consumer markets.
Power solid state relays i4-PAC™, ISOPLUS™-264 and power SIP relays use optically coupled MOSFET technology to provide 2500Vrms of input to output isolation and, as in all Clare solid state relays, the optically coupled output is controlled by a GaAIAs infrared LED.
Optically isolated solid state relays
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