The rated current of a single phase ac motor is several times that of an empty current.
A small single-phase motor, which is rated at about twice the amount of an empty current
That's not how you understand it. 220V depends on whether you are a three-phase or single phase. For the three-phase P = 1.732 * U * power factor, for a single phase, P = UI. In other thermal relays we typically press 0.95-1.05 motor rated current. It doesn't seem to have been selected by 1.2 times.
The general situation depends on the power of the motor: the low electric current can reach 60% of the rated current and even higher. Large electrical current is normally only about 25% of the rated current. The three-phase motor is five to seven times direct start-up, three to five times the voltage drop, and the three phase motor is seven times the current. Single phase motor is 8 times.
