Relay Coil Power Calculator

Calculate relay coil current, power dissipation, and flyback diode requirements.

Rated coil voltage.
V
DC resistance of the relay coil.
Ω
Coil inductance in mH.
mH

Results

Coil Current-mA
Coil Power-mW
Stored Energy-µJ
Time Constant (L/R)-ms
References: Omron Relay Technical Guide; TE Connectivity Relay Application Notes