The DC voltage input from the control terminal makes the light-emitting diode inside the quality 24vdc relay work, and the switching circuit composed of the triac in the output loop is turned on through optical coupling, which completes the control of the output terminal. The input circuit only needs to control the luminous tube, so only low voltage and small current are needed; optical coupling ensures the isolation between input and output; the selection of the size of the thyristor element in the output circuit determines the working voltage of the quality 24vdc relay output And current.

The quality 24vdc relay is composed of a fixed iron core, a moving iron core, a spring, a moving contact, a static contact, a coil, a terminal and a shell. When the coil is energized, the moving iron core acts to pull in under the action of electromagnetic force, driving the moving contact to move, so that the normally closed contact is separated and the normally open contact is closed; the coil is de-energized, and the moving iron core drives the moving contact under the action of the spring Reset. The contacts are divided into two types: normally closed and long open, and one common point.

The main function of the solid state relay is to realize contactless connection and disconnection, that is, unlike an AC contactor, there is an arc when it is connected. The single-phase solid state relay uses the quality 24vdc relay to control the single-phase contact to make and break. The working principle is the same as that of the intermediate relay, the quality 24vdc relay, the contact is closed. DC is the control coil, and the AC output controls the load.

The quality 24vdc relay is an electronic control device. It has a control system (also called an input loop) and a controlled system (also called an output loop). It is usually used in automatic control circuits. It actually uses a smaller current to control A kind of "automatic switch" with higher current. Therefore, it plays the role of automatic adjustment, safety protection, and conversion circuit in the circuit. The quality 24vdc relay has been 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 systems ;Instruments and meters, medical equipment, photocopiers, automatic washing machines; automatic fire fighting, security systems, as well as the switch of power capacitors for power factor compensation of the power grid, etc., in addition to the chemical industry, coal mines and other occasions requiring explosion-proof, moisture-proof and corrosion-proof Used extensively.