Electromagnetism system of trip

The utility model relates to an electromagnetism system of a trip. The electromagnetism system comprises an armature, a magnetic core and an electromagnetic coil that is sheathed on the magnetic core. The electromagnetism system is characterized in that at least one non-magnetic metal layer is arranged at the surface of the magnetic core or at the surface of the armature or at the surfaces (at least the working pole face) of the magnetic core and the armature respectively, thereby reducing the residual magnetism of the electromagnetism system and ensuring the armature to release and reset quickly after the electromagnetism system is cut off, so that the trip can work normally and reliably within the range of lower voltage; meanwhile, the layer(s) arranged at the surface(s) can have the functions of corrosion prevention, rust protection and appearance beautifying, so that the trip can meet the severe service environment, therefore, the electromagnetism system can be widely applied to various switching devices.