Signal Relay
Power Relay
Automotive Relay
Common Failure Relay

Failure phenomenon

Failure Mode




Relay is not action


Coil-side no-voltage

Supply line circuit

Circuit wiring errors

Circuit wiring short-circuit

Foot welding leads to bad


Coil terminal voltage less than

Power Supply Voltage Low

Power cord is too long

Select size high-voltage relays

Coil unreasonable

Welding bad

Coil break


Relay does not release

Coil terminal voltage is too high residual

Coil-side there are other components of energy storage

Youlou coil current or bypass current

The remaining high-voltage semiconductor circuits



Relay instability

Power instability

Too Ripple Power Supply


Relay parameter instability

Dropped or subjected to strong shocks

Winding inter-turn short circuit

Relay malfunction

Control program is incorrect

Excessive use of environmental vibration



Contact Adhesive


The load is too large

Inrush current is too large

Contact abnormal jitter

External vibrations

Relay instability

Relay frequency is too high


The ambient temperature is too high

Relay service life expires



Contact is not closed

Contact resistance is too large

Welding bad

Contacts between the foreign body

The use of a bad environment, contact oxidation or sulfide

No current contact terminal

Load circuit breaker

Circuit wiring fault or short-circuit

Welding bad foot print

Relay life


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