Generally, a relay has an inductive mechanism (input part) that can reflect certain input variables such as current, voltage, power, impedance, frequency, temperature, pressure, speed, light, etc.; it has an actuating mechanism (output part) that can realize "on" and "off" control of the controlled circuit; between the input part and the output part of the relay, there is also an intermediate mechanism (drive part) that performs coupling isolation and functional processing on the input quantity and drives the output part. As a control component, relays have the following functions in general: (1) Expand the control range: For example, when the control signal of a multi-contact relay reaches a certain value, it can simultaneously switch, break and connect multiple circuits according to different forms of contact groups. (2) Amplification: For example, sensitive relays, intermediate relays, etc., can control a circuit with high power with a very small control amount. (3) Comprehensive signal: For example, when multiple control signals are input to a multi-winding relay in a specified form, the predetermined control effect is achieved through comparison and synthesis. (344) Automatic control, remote control and monitoring: For example, relays on automatic devices together with other electrical appliances can form a program control circuit, thereby realizing automatic operation.

As a control component, relays have the following functions in general:

(1) Expand the control range: For example, when the control signal of a multi-contact relay reaches a certain value, it can simultaneously switch, break and connect multiple circuits according to different forms of contact groups.

(2) Amplification: For example, sensitive relays, intermediate relays, etc., can control a circuit with high power with a very small control amount.

(3) Comprehensive signal: For example, when multiple control signals are input to a multi-winding relay in a specified form, the predetermined control effect is achieved through comparison and synthesis.

(21) Automatic control, remote control and monitoring: For example, relays on automatic devices together with other electrical appliances can form a program control circuit, thereby realizing automatic operation.
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