Patent ID: 6140599
Filing Date: 2000-10-31
Classification: H01H

Abstract:
A contact configuration for vacuum switches, comprising:a pair of confronting contact pieces having a circular base with radius R.sub.K, each contact piece having a center, an outer perimeter and a central circular recess defining an inner perimeter of said contact piece;each of said contact pieces having three to six individual slots extending from said inner perimeter of said contact piece to said outer perimeter of said contact piece, forming a spiral-type contact;said slots having contours with a variable and increasing radius of curvature and being described by a radius r depending on an angle .psi. in a polar coordinate system with an origin coinciding with said center of said contact pieces;said slots having a length in radian measure between 5/12 and 2/3 .pi. in relation to the outer perimeter of said contact piece, each of said individual slots forming an angle .psi.>.pi./3 with the inner perimeter of said contact piece.