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.

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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.

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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.

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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.

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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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www.maxge.com All Rights Reserved.

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