Relay Calculator
Calculate relay coil requirements, flyback protection, and contact ratings.
Relay Specifications
Contact Circuit
Coil Requirements
30.0 mA
Coil Current
360 mW
Coil Power
Flyback Protection
Flyback Spike120 V
Clamped Voltage12.7 V
Use 1N4148 or 1N4007 flyback diode across coil
Contact Derating
Derating Factor100%
Effective Rating10.0 A
Switch Power1200 W
Timing
Pickup Voltage9.0 V
Dropout Voltage3.0 V
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: Standard Mathematical References
by Various
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.