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What Is The Control Relay? Jun 21, 2018

What is the control relay?

 

The control relay is an automatic electrical appliance, which is suitable for remotely switching on and off AC and DC small-capacity control circuits, and used in the electric drive system for control, protection and signal conversion. The input of the control relay is usually electric current, voltage, etc., and it may also be non-electricity such as temperature, pressure, and speed, and the output is the change of the electric signal or the output circuit parameter when the contact operates. The relay is characterized by a step change in the output when the change in the input quantity reaches a certain program.

 

Control Relay.jpgThe control relay is an automatic electrical appliance, which is suitable for remotely switching on and off AC and DC small-capacity control circuits, and used in the electric drive system for control, protection and signal conversion. The input of the relay is usually a current, a voltage, etc., or it may be a non-electric quantity such as a temperature, a pressure, or a speed, and the output is the change of the electrical signal or the output circuit parameter when the contact operates. The relay is characterized by a step change in the output when the change in the input quantity reaches a certain program.


Control relays are used for a wide variety of applications and can be classified into voltage relays, current relays, time relays, thermal relays, and speed relays. When the general relay is used as a voltage relay, the attraction voltage can be adjusted within the range of 30%~50%Un, the release voltage can be adjusted within the range of 7%~20%Un; when used as the undercurrent relay, the attraction current can be made at 30 The range of %~65%In is adjusted; when used as a time relay, the power-off delay range is 0.3~5s. Its return coefficient is not specified. However, when the overcurrent or overvoltage relay is used, the return coefficient is less than 1; when the overcurrent or undervoltage relay is used, the return coefficient is greater than 1.