CONTACT SYSTEM Russian patent published in 2000 - IPC

FIELD: miscellaneous ac and DC circuit-opening devices using bridge-type contracts. SUBSTANCE: contact system has movable contact bridge with flats arranged symmetrically at its ends that mount contact members, and fixed contacts in the form of clamps whose upper sides have flats mounting contact members; flats mounting contact members of movable contact bridge and those of fixed contacts have their outer edges inclined to contact closing surface. As a result, points at which contact members first come in contact are offset in direction of outer edges of contact system and escape of contact material due to arc generation and displacement occurs on plane inclined to bases of contact members; that is why, contact material first escapes from their outer edges, then escape zone gradually displaces towards center and further to inner edges. EFFECT: saved silver due to increased mechanical endurance of contact members. 4 dwg