Coil Voltage Specification

Number of turns.
Del

1. The contactor will effectively close with 220 V with a 220 V coil, one with 440 V coil you need 440 V to do the same work. They need two terminals, one for the current to flow in, do the magnetising & return back to the source through the other terminal.

2. Where you are employing 220 V for all your control circuits, you go for all 220 V contactor coils. But you must have a 440 V 3 phase with neutral, 4 wire system

3. With only 440 V 3 phase supply availability, you go for 440 V coils for your contactor.

A 1uH choke also has 2 terminals. As does an electromagnet used for lifting tons of steel. For that matter, so does a 1N4148 signal diode.

I really don't understand your point about the two contactor coils both having "two terminals" .

hello the difference between coil voltage 220vac need L1+N AND 440VAC NEED L1+L2

and the better one if you have 2 phase because if you use one phase and the neutral wire lost the coil burn

good chance

The difference between voltages coil 220v ac and 440v ac of a contactor is the number of the turns if they are winded with same size of the wire.for the same construction

The difference between their construction is the size of the wire .