Solid state relay (SOLIDSTATERELAYS, hereinafter referred to as SSR), is a new type of non-contact switching device composed of solid electronic components. It uses the switching characteristics of electronic components (such as switching transistors, triacs and other semiconductor devices) to achieve The purpose of making and breaking the circuit without contact and spark, so it is also called non-contact switch. A solid state relay is a four-terminal active device, in which two ends are input control terminals, and the other end is an output control terminal. It has both amplifying drive function and isolation function, which is very suitable for driving high-power switch actuators. Compared with electromagnetic relays, it has higher reliability, non-contact, longer service life and faster speed, and has less interference to the outside world, and it has been widely used.
A solid state relay is a non-contact electronic switch with isolation function. There are no mechanical contact parts during the switching process. Therefore, in addition to the same functions as electromagnetic relays, solid state relays also have logic circuit compatibility, vibration resistance, mechanical shock resistance, unlimited installation positions, moisture resistance, mildew resistance, good corrosion resistance, explosion protection, ozone pollution prevention, low input power, High sensitivity, low control power, good electromagnetic compatibility, low noise, high working frequency, etc.
The dedicated solid-state relay has the functions of short-circuit protection, overload protection and overheating protection, combined with the logic curing package, can realize the intelligent module required by the user, which can be directly used in the control system.
Solid state relays are widely used in computer peripheral interface equipment, constant temperature systems, temperature adjustment, electric furnace heating control, motor control, CNC machinery, remote control systems, industrial automation equipment signal lights, dimming, flashers, lighting stage lighting control system instruments, medical equipment , Photocopiers, automatic washing machines, automatic fire protection, security systems, power capacitor switch for power factor compensation in power grids, etc., are widely used in the chemical industry, coal mines and other occasions that require explosion-proof, moisture-proof, and anti-corrosion.
