Patent ID: 8766750

Claim:
A driving unit of an electromagnetic switching apparatus, the driving unit comprising: a fixed core positioned at a lower side of the driving unit and fixedly-installed such that the fixed core is not movable by an electromagnetic force; a movable core positioned at an upper side of the driving unit and having a lower portion that faces the fixed core and an upper portion that is directly fixed to a movable contact; a coil that is configured to: generate a first repulsive force between the fixed core and the movable core by using the electromagnetic force, the electromagnetic force generated when a current is applied to the coil, and drive the moveable core by using the electromagnetic force such that the movable contact contacts a fixed contact of the driving unit when the movable core is separated from the fixed core; and an upper case and a lower case, the upper and lower cases forming a space that hermetically encloses the fixed contact and the movable contact, wherein the upper portion of the movable core has a smaller cross-sectional surface area than the lower portion of the movable core, wherein the lower case forms an opening through which the upper portion of the movable core passes, and wherein an upper portion of the fixed core faces the lower portion of the movable core, and the upper portion of the fixed core is partially cut to form a first shape.