Classification of relay

Update date:2018-01-12 Source:MAXGE

1. Scope of use

A protection relay: used for protection of power systems as engines, transformers and transmission equipment.

B control relay: mainly used for power drag system to realize control process automation and provide some protection.


C communication relay: mainly used for telecommunication and remote control system.

2. According to the nature of the input signal

A voltage relay: when the control circuit voltage reaches a set value, the circuit is connected or divided.

B current relay: when the current in the control circuit reaches a set value, the circuit is switched on or off.

C intermediate relay: in principle, it is still a voltage relay, but it is generally added to a certain electrical and controlled circuit to increase the number and capacity of the control contact.


D time relay: after receiving the action signal, the contact can be delayed for a certain time by electromagnetic mechanism, mechanical mechanism or electronic circuit to realize control system time control.

E thermal relay, is still in the principle of the current relay, but it is the use of bimetallic strip heated bending to promote contact action, being heated bending is a process of time delay, generally use it to achieve overload protection.


F temperature relay: when the temperature reaches a set value, it moves to achieve overheating protection or temperature control.

G water level relay: when the water level in the container reaches the set value, the action is to achieve overflow, defluid protection or water level control.


3. The working principle can be divided into electromagnetic relay, electrodynamic relay, thermal relay, transistor type relay or integrated circuit type relay.

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