Star-Delta Starter Calculator

Determine optimal starter settings and contactor sizes for star-delta motors.

Motor data input

Power

Voltage (L-L)

Efficiency

Power Factor

Cos θ

Calculation Results

Full-Load Current

i_FLC (A)

–

Main Contactor

Min. AC-3 (A)

–

Delta Contactor

Min. AC-3 (A)

–

Star Contactor

Min. AC-3 (A)

–

Overload Relay

Set after Main Contactor (A)

–

Disclaimer: This calculator provides approximate values for planning purposes only. Always verify results against relevant standards and consult a licensed electrical professional before installation.