High-speed automatic tripping contactor

An electromagnetic contactor having a contactor unit comprising:

• a coil wound on a stationary magnetic core which attracts a movable armature of magnetic material upon energization of said coil,
• a movable contact carrier secured mechanically to said armature so as to be actuated between an open position and a closed position of contactor,
• a stationary contact cooperating with a movable contact supported by said contact carrier, said contacts coming into engagement with each other in the closed position and being maintained in this position upon attraction of said movable armature against the magnetic core,
• bias means urging a movable element comprising said armature and said contact carrier towards the open position upon deenergization of said coil,
• a high-speed electrodynamic trip device associated to said contactor unit and including a control winding, a movable conductive disc arranged in front of said winding and a striker secured to said disc so as to strike said movable element upon energization of said control winding ensuring an electrodynamic repulsion of said disc which moves said movable element towards the open position against the electromagnetic attraction forces developed between said armature and core.