Solid state relay (also known as solid state relay) English name is Solid State Relay, referred to as SSR. It is a non-contact switching device with relay characteristics using a semiconductor device instead of a conventional electrical contact as a switching device. The single-phase SSR is a four-terminal active device, wherein two input control terminals, two output terminals, and input and output are light. Isolation, after the input terminal plus DC or pulse signal to a certain current value, the output can be changed from off state to on state.
Solid state relays work reliably, long life, no noise, no spark, no electromagnetic interference, fast switching speed, strong anti-interference ability, small size, impact resistance, anti-vibration, explosion-proof, moisture-proof, anti-corrosion, and TTL, DTL, The logic circuits such as HTL are compatible, and the direct drive large current load is achieved with a small control signal. The main disadvantage is the presence of on-state voltage drop (requires corresponding heat dissipation measures), off-state leakage current, AC/DC can not be used universally, the number of contact groups is small, and the over-current, over-voltage and voltage rise rate, current rise rate and other indicators are poor.
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