Hitachi, Ltd.

Shunkichi Endo

Yukio Kurosawa

Yoshitaka Kojima

Toru Tanimizu

Katsuhiro Komuro

Yoshimi Hakamata

Yoshio Koguchi

Kouji Suzuki

Morihisa Matumoto

According to the present invention there are provided a highly reliable electrode of high strength which undergoes little change even with the lapse of time, and a method for making the same, as well as a vacuum valve using such electrode and a vacuum circuit breaker using such vacuum valve. The vacuum circuit breaker has a fixed electrode and a movable electrode, each comprising an arc electrode, an arc electrode support member for supporting the arc electrode, and a coil electrode contiguous to the arc electrode support member, the arc electrode, the arc electrode support member and the coil electrode being formed as an integral structure by melting, not by bonding, particularly the arc electrode support member and the coil electrode being constituted by a Cu alloy containing 0.05-2.5% by weight of at least one of Cr, Ag, W, V and Zr.

Vacuum circuit breaker as well as vacuum valve and electric contact used

Method forming an electric contact in a vacuum circuit breaker

Vacuum circuit breaker and electric contact

A contact structure for a vacuum circuit breaker has an electrically insulating vacuum vessel, fixed and movable contact units sealed in the vacuum vessel and shield members surrounding the fixed and movable contact units in the vacuum vessel. Particles of a metal are applied to at least a part of the inner surface of the vacuum vessel.

Contact structure for vacuum circuit breaker

Growing community of inventors

Hitachi, Japan

Shunkichi Endo