The Main Function Of Relay

Relay is an automatic switch component with isolation function, widely used in remote control, telemetry, communication, automatic control, electromechanical integration and power electronic equipment, is one of the most important control components.
Generally, relays have induction mechanisms (input part) that can reflect certain input variables (such as current, voltage, power, impedance, frequency, temperature, pressure, speed, light, etc.). The actuator (output part) can realize the "on" and "off" control of the controlled circuit; Between the input part and the output part of the relay, there is also coupling and isolation of the input, function processing and the output part of the drive part of the intermediate mechanism (drive).
As a control element, the relay has the following functions in a nutshell:
(1) Expand the control range: for example, when the control signal of the multi-contact relay reaches a certain value, it can change, break and connect the multi-circuit at the same time according to different forms of the contact group.
(2) Amplification: For example, sensitive relay, intermediate relay, etc., with a very small control amount, can control a large power circuit.
(3) Comprehensive signal: for example, when multiple control signals are input into multi-winding relays in the prescribed form, the predetermined control effect can be achieved through comparative synthesis.
(4) Automatic, remote control, monitoring: for example, the relay on the automatic device, together with other electrical appliances, can form a program control line, so as to realize automatic operation.