When the change of input (excitation) meets the specified requirements, relay is a kind of electrical appliance that makes the controlled quantity change in the electrical output circuit in a predetermined step. It is an electrical control device and an automatic switching element with isolation function. It is widely used in remote control, telemetry, communication, automatic control, mechatronics and power electronic equipment, Is one of the most important control components. Let's get to know three kinds of common relays together with industrial electrical network.
electromagnetic relay
Electromagnetic relay is a switch that uses electromagnet to control the working circuit. It has control system (also known as input circuit) and controlled system (also known as output circuit). It is generally used in automatic control circuit. In fact, it is an "automatic switch" that uses smaller current and lower voltage to control larger current and higher voltage. Therefore, it plays the role of automatic regulation, safety protection and conversion circuit in the circuit.
Take you to know three common relays
Electromagnetic relay can control high voltage and strong current working circuit with low voltage and weak current control circuit, and can realize remote control and production automation. Electromagnetic relay is widely used in automatic control (such as control circuit in refrigerator, car, elevator and machine tool) and communication field.
Solid state relay
Solid state relay (SSR) is a contactless switch composed of microelectronic circuits, discrete electronic devices and power electronic devices. Solid state relay uses isolation device to realize the isolation of control end and load end. Its input end uses tiny control signal to directly drive high current load.
Take you to know three common relays
Compared with electromagnetic relay, solid state relay has higher reliability, no contact, long service life, fast speed and less interference to the outside world, so it has been widely used.
Time relay
Time relay is a kind of automatic control electrical appliance which uses electromagnetic principle or mechanical action principle to delay contact closing or breaking. When the time relay receives the start signal, it will start timing, and its working contact will open or close after timing, so as to promote the subsequent circuit work. Usually, the delay performance of time relay can be adjusted within the design range, so that it is convenient to adjust its delay time. I'm afraid that only one time relay can't start to delay closing. After closing for a period of time, it can open again. It can realize delay closing first and then delay opening. But it can be achieved by configuring a certain number of time relays and intermediate relays.
Take you to know three common relays
Time relay is a very important component in the electrical control system. It is characterized by a time delay from the time when the signal is received by the attraction coil to the action of the contact. It is usually used in the motor starting process control with time as a function.