What is Relay

- Jul 02, 2019-

What is Relay


A relay is a component that produces a predetermined transition in one or more outputs when the input amount reaches a specified condition. For electromagnetic relays, solid state relays and combined relays, it can be simply understood as: a predetermined electrical signal is applied to the input, and its output is switched on and off by a switch of the control circuit.

Scope of applicationAdvantage

Electromagnetic relay

Communication relayGenerally used for communication and signal control

The output of the disconnection has no leakage current and large load, no external heat sink is needed.

General purpose relayGenerally used in home, industrial control and power control
Automotive relaySuitable for the automotive sector
Sealed relaySuitable for areas with harsh environments or high reliability requirements

Solid state relay

Suitable for areas with harsh environments, low noise requirements or high reliability requirements

Long electrical durability


Good resistance to vibration and shock

Combined relayAreas that need to implement certain control functions
Have certain control logic

Unless otherwise stated, the parameters listed in the general product specification are the initial values measured under standard conditions. The standard status is:
1) Temperature: 15 ° C ~ 35 ° C;
2) Relative humidity: 25% to 75%;
3) Atmospheric pressure: 86 kPa to 106 kPa.

Unless otherwise stated, the drawings provided by Meishuo generally use the first quadrant projection method.