A contactor coil is designed for 220 V, D.C. What happens if it is connected to 220 V, A.C.?
1
A too large current is drawn by the coil and it is destroyed
2
A too-small current is drawn by the coil and the operation of the contactor is no longer certain
3
The permanent magnet of the magnetic system is demagnetized
4
The coil insulation is quickly damaged by the alternating voltage