How a Solenoid Works A solenoid is a coil of wire in a corkscrew shape wrapped around a piston, often made of iron. As in all electromagnets, a magnetic field is created when an electric current passes through the wire. Electromagnets have an advantage over permanent magnets in that they ca...
RRaghunath Electrical Aug 19, 2002 1,712 IN Did you check the speed when the star contactor gets command to open! It could be that the contactor tried to break motor starting current. You indicated breaking current rating for the contactor as 930A, are you sure this is at 0.2 pf (wh...