Patent ID: 8766750
Filing Date: 2014-07-01
Classification: H01H

Abstract:
1. 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: 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.