Relay Calculator

Calculate relay coil requirements, flyback protection, and contact ratings.

Relay Specifications

Coil Voltage (V)

Coil Resistance (Ohms)

Supply Voltage (V)

Driver Type

Switch Voltage (V)

Switch Current (A)

Load Type

30.0 mA

Coil Current

360 mW

Coil Power

Flyback Spike120 V

Clamped Voltage12.7 V

Use 1N4148 or 1N4007 flyback diode across coil

Derating Factor100%

Effective Rating10.0 A

Switch Power1200 W

Pickup Voltage9.0 V

Dropout Voltage3.0 V