Two way output AC solid state relay XSSR-DD2540 ssr relay
The English name of SSR relay (also known as solid relay) is solidstate relay, abbreviated as SSR. It is a contactless switching device with relay characteristics that uses semiconductor devices instead of traditional electrical contacts as switching devices. Single phase SSR is a four terminal active device, in which two input control terminals and two output terminals are optically isolated between input and output. After the input terminal is added with DC or pulse signal to a certain current value, the output terminal can change from off state to on state.
Where can SSR relay be used?
SSR relay has been widely used in computer peripheral interface device, electric furnace heating constant temperature system, numerical control machinery, remote control system and industrial automation device; Signal lamp, scintillator, lighting stage lighting control system; Instruments and meters, medical instruments, copiers, automatic washing machines; Automatic fire protection, security system, and power capacitor switching switch as power factor compensation of power grid. In addition, it is widely used in chemical industry, coal mine and other occasions requiring explosion-proof, moisture-proof and corrosion prevention.
What are the types of SSR relays?
AC SSR relay can be divided into voltage zero crossing conduction type (referred to as zero crossing type) and random conduction type (referred to as random type) according to switching mode; According to the output switching elements, there are bidirectional thyristor output type (ordinary type) and unidirectional thyristor anti parallel type (enhanced type); According to the installation mode, it is divided into the needle type used on the printed circuit board (natural cooling, without radiator) and the device type fixed on the metal base plate (cooling by radiator); In addition, the input terminal has constant current source type and series resistance current limiting type with wide range input (dc3-32v).
Difference between zero crossing SSR and random SSR
When an effective control signal is applied at the input end, the output end of random SSR will be turned on immediately (the speed is microsecond), while the zero crossing SSR will not be turned on until the load voltage crosses the zero area (about ± 15V). When the input terminal cancels the control signal, the zero crossing type and random type SSR are turned off when they are less than the maintenance current. Although zero crossing SSR may cause the maximum half cycle delay, it reduces the impact on the load and RF interference. It has become an ideal switching device and is most widely used in "single pole single throw" switching occasions. Random SSR is characterized by fast response speed. It can control the phase-shifting trigger pulse to easily change the AC power grid voltage, so it can be applied to the occasions of accurately regulating temperature, dimming and other resistive loads and some inductive loads.