Vacuum-type circuit breaker
AssigneeHitachi, Ltd.
InventorsHideo Arakawa, Takashi Namekawa, Keiichi Kuniya, Hiroyuki Sugawara
Life of this patent
Estimating the term…
Abstract
A vacuum-type circuit breaker comprising an evacuated container, and a pair of contacts disposed in the container and adapted to be moved between an open position and a closed position to permit a circuit breaking arc to be generated across the contacts, the contacts being made of a copper alloy containing manganese. The vacuum-type circuit breaker provided with the contacts of the aforementioned type has a higher dielectric strength than conventional vacuum-type circuit breakers.
Claims12
A vacuum-type circuit breaker comprising an evacuated container, and a pair of contacts disposed in said container and adapted to be moved between an open position and a closed position to permit a circuit breaking arc to be generated across the contacts, said contacts consisting substantially of a copper alloy which is cast from a melt, said alloy containing an intermetallic compound of manganese and a metal selected from the group consisting of aluminum, silicon, zirconium, nickel, titanium and chromium, such that said contacts have a high initial dielectric strength, which dielectric strength is not substantially reduced as said contacts are repeatedly moved between an open position and a closed position to permit a circuit breaking arc to be generated across the contacts.
Dependencies are inferred from the claim text.