VACUUM PRESSING MULTIPOINT CONTACT PIECE

PROBLEM TO BE SOLVED: To provide a vacuum circuit breaker using a multipoint contact piece having cutoff performance and effects, such as high breakdown voltage, low resistance electric conduction, low deposition peeling force, high strength, spring function stability, and identical material configuration.SOLUTION: A vacuum circuit breaker has a substantially Z-shape in which one end of the multipoint contact piece is a contact seat 15, the other end is a stationary seat 16 and a part therebetween is an intermediate part 14. The contact seat 15 of the contact piece and the stationary seat 16 of an adjacent contact piece are overlapped with each other, and a spring is disposed therebetween. A plurality of contact pieces are arranged side by side by being supported on a conductive plate via a support pin passing through the contact seat, the stationary seat and the spring. The center of a stationary seat round surface 16X at a contact portion of the stationary seat is disposed on the intermediate part 14. The center of a contact seat round surface 15X at a contact portion of the contact seat 15 is disposed on the contact seat 15. A straight line slope 15B is disposed on the intermediate part, and a slope is disposed on the contact seat 15. Further, a pin groove 19B and a pin head groove 19A are disposed on a side surface of the contact seat 15.