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The starter is sized by amperage of the motor. The first thing that has to be done is find the the current by using this formula for amperage when the HP is known. I = HP x 746/1.73 x E x %eff x pf.

A standard motor's efficiency between 5 to 100 HP is .84 to .91.

A standard motor's power factor between 10 to 100 HP is .86 to .92.

Amps = 5 x 746 = 3730/1.73 x 208 = 3730/360 x .84 x .84 = 3730/ 254 = 14.68 amps

A three phase size 1 magnetic starter is rated for 27 amps and can be used up to 7.5 HP.

If the voltage was 460 to 575 a size 0 could be used.

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