Zhejiang Kun Kun two crystal two-way solid-state relay DC control AC relay crystal SSVR25A

Solid state relay (Solid State Relay, acronym SSR), is composed of microelectronic circuits, discrete electronic devices, power electronic power devices composed of non-contact switch. With isolation devices to achieve the control terminal and the load side of the isolation. Solid state relay with the input control signal small, to directly drive high current loads. Uses proprietary solid state relays can short-circuit protection, overload protection and thermal protection, and combinational logic cured encapsulant can achieve user needs intelligent module directly to the control system. Solid-state relays are widely used in computer peripheral interface devices, thermostats, thermostat, furnace heating control, motor control, CNC machinery, remote control systems, industrial automation equipment; lights, dimming, flashing, lighting stage lighting control systems; Instrument instrumentation, medical equipment, copiers, automatic washing machines; automatic fire protection, security systems, as well as electric power grid power factor compensation capacitor switch, etc., in addition to the chemical, coal and other required proof, moisture, corrosion occasions have a lot of use Features solid state relay is a isolation of non-contact electronic switch, no mechanical contact parts in the switching process, so in addition to a solid state relay and electromagnetic relay the same function, but also has a logic circuit compatibility, resistance to vibration resistance to mechanical shock, installation position no limit, with good moisture mildew anti-corrosion, explosion-proof performance and prevent ozone pollution is also an excellent, low input power, high sensitivity, low-power control, electromagnetic compatibility, low noise and operating frequency characteristics. Advantages of (1) high life, high reliability: no mechanical parts solid state relays, solid state devices is completed by a contact function, because there is no movement of parts, it can work under high shock and vibration environment, due to the composition of solid state relays yuan the inherent characteristics of the device, determines the long life solid state relays, high reliability. (2) high sensitivity, control power is small, electromagnetic compatibility: solid state relays wide input voltage range, low power drive is compatible with most logic integrated circuit without additional buffers or drive. (3) fast conversion: Because the use of solid state relays solid state devices, so that the switching speed can be from a few milliseconds to a few microseconds. (4) Electromagnetic interference is small: solid state relay does not enter "coil" and no touch ignition arc and rebound, thus reducing electromagnetic interference. Most AC output solid state relay is a zero voltage switching at zero voltage turn-on, turn-off at zero current, reducing the sudden interruption of the current waveform, thereby reducing switching transients. Disadvantages (1) pressure drop after conducting a large, SCR or bidirectional thyristor forward buck up 1 ~ 2V, saturation voltage power transistors also between 1 ~ 2V, the general power field effect on-resistance tube contact resistance are more big mechanical contacts. (2) A semiconductor device shutdown is still a few microamps to several milliamps of leakage current, and therefore can not achieve the desired electrical isolation. (3) Since the pipe pressure drop, power consumption and heat conduction after also large volume of high-power solid-state relay is far greater than with the capacity of the electromagnetic relay, the cost is higher. (4) The temperature characteristics of electronic components and electronic circuit anti-interference ability is poor, radiation resistance is also poor, if not take effective measures, the working poor reliability. (5) solid-state overload relays have a greater sensitivity, it must be quick fuse or overload protection with RC damping circuit. Load and ambient temperature is significantly related to solid-state relays, temperature, load capacity will decrease rapidly. (6) The main problem is the presence of on-state voltage drop (for an appropriate cooling measures), there are off-state leakage current, AC and DC can not be universal, a small number of the contact group, in addition to over-current, over-voltage and voltage rise rate of current rise rate poor indicators. SSR solid state relay AC relay, triac output. Triac zero-switch relay is a low-cost solution for resistive load. When the AC sinusoidal voltage just over zero, zero switching relay to open, when the current passes through zero, it will determine whether the product features: 1, rated operating current: 10-40Amps 2, rated working voltage: 240V or 440V 3,4000Vrms optical isolator (Input / Output) 4, input voltage range: 4-16Vdc, 3-32Vdc or 90-280Vac 5, "zero pressure" type and phase modulation "random switching" type 6, the control input LED indicator