Hello There are different application voltages for three-phase motors so it is not enough to say "I mean a three-phase motor, scroll type example" What voltage are you going to connect to? if for example you are in Argentina and connect it to 3x380 V which is the most common supply in this country, the amperage of the mentioned equipment will be approximately 10 A per phase The star triangle connection does not have to do with the type of motor compressor but with the power of the motor and load applied, usually 5 HP does not require special starting, it will be enough with a direct start Star triangle is a type of starter that is used in high-power engines, in Argentina those engines must be rated 380/660 to use this type of starter. The 220/380 motors could not be connected in a triangle star when the supply voltage is 380 because it would burn. Therefore it is not due if the engine is not suitable. As for power, it is usually above 7.5 HP (generally speaking) regards