ClicksA relay is an electrical appliance that causes the controlled quantity to undergo a predetermined step change in the electrical output circuit when the input quantity (excitation quantity) changes to the specified requirements. It is an electrical control device and an automatic switch with isolation function. Components are widely used in remote control, telemetry, communication, automatic control, mechatronics and power electronic equipment, and are one of the most important control components. Let’s take a look at 3 common relays with the editor of Industrial Electrical Network.
Electromagnetic relay
An electromagnetic relay is a switch that uses an electromagnet to control the on and off of a working circuit. It has a control system (also called an input loop) and a controlled system (also called an output loop). It is generally used in automatic control circuits. In fact, it uses a smaller current and a lower voltage to control a larger current and a higher A kind of "automatic switch" of the voltage, so it plays the role of automatic adjustment, safety protection, and conversion circuit in the circuit.
Electromagnetic relays can use low voltage and weak current control circuits to control high voltage and strong current working circuits, and can realize remote control and production automation. Electromagnetic relays are widely used in automatic control (such as control circuits in refrigerators, automobiles, elevators, and machine tools) and communications.
solid state relay
Solid state relays are non-contact switches composed of microelectronic circuits, discrete electronic devices, and power electronic power devices. The isolation device of the solid state relay realizes the isolation between the control end and the load end, and its input end uses a tiny control signal to directly drive a large current load.
Solid state relays have both isolation and amplifying driving effects. They are very suitable for driving high-power switching actuators. They are more reliable than electromagnetic relays, and have no contact, long life, fast speed, and little interference to the outside world. Has been widely used.
Time Relay
The time relay is an automatic control electrical appliance that uses the principle of electromagnetic or mechanical action to delay the closing or breaking of contacts. When the time relay receives the start signal, it starts timing. After the timing ends, its working contact opens or closes to promote the subsequent circuit work. Usually the time delay performance of the time relay can be adjusted within the design range, so as to facilitate the adjustment of its delay time. I am afraid that only 1 time relay can not start to close with a delay. After closing for a period of time, it will open again. First realize the delayed closing and then delay the opening, but it can be done by configuring a certain number of time relays and intermediate relays. Arrived.
The time relay is a very important component in the electrical control system. It is characterized by a delay from the time the attracting coil receives the signal to the contact action. It is usually used in the control of the motor starting process with time as a function.
