The main function of relay

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    The relay is an electrical control device, when the input (excitationvolume) changes to the requirements, the electrical output circuit to make the controlled quantity of an electric appliance the occurrence of a predetermined step change. It has a control system (also known as the input circuit) and the controlled system (also known as the output circuit) the interaction between the. The control circuit is usually applied to automation, it is actually a kind of "automatic switch to control large currentoperation with small current". It plays in the automatic adjustment circuit, safety protection, the role of conversion circuit.

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      The main role

      The relay is automatic switch components with isolation function,widely used in remote control, telemetry, communication,automatic control, electromechanical integration and power electronic devices, is one of the most important control element.

    Relays are generally can reflect a certain input variables (such as current, voltage, power, frequency, impedance, temperature,pressure, speed, light etc.) induction mechanism (input); can the controlled circuit to realize the "pass", "off" control actuators(output) between the input part; and the output part of the relay,and coupling isolation of input, processing and output part of the middle drive (driving).

      To sum up, the relay as control element, there are several effect:

     1).Axpand the control range: for example, relay contact control signal reaches a certain value, can according to the different forms of contact group, at the same time, take off, multichannelcircuit.

     2).Amplification: for example, sensitive relay, intermediate relay,with a very small amount of control, circuit can control largepower.

      3).Integrated signal: for example, when a plurality of control signals in the prescribed form input multi winding relay, aftercomparison, control effect to the predetermined.

      4).Automatic, remote control, monitoring: for example, automaticdevice of relay and other electrical appliances together, can form a program control circuit, to realize automatic operation.