CONTACT SYSTEM FOR FAST-ACTING AUTOMATIC CIRCUIT BREAKER Russian patent published in 2009 - IPC H01H75/02 

FIELD: electricity.

SUBSTANCE: invention is related to double-break contact systems of low-voltage automatic circuit breakers. Contact system is equipped with two "П"-shaped yokes with coaxial openings at their side walls, which divide each yoke into "П"-shaped and fork-shaped arms. The second ends of pressing springs are made in the form of extended hooks, lengths of which are not less than length of yokes. The yokes themselves are mounted inside drum between its internal and external disks at distances R from axis of rotation at formed coaxial cylindrical extensions, with height of not more than thickness of yoke side walls. Cylindrical thrusts are installed on both sides of rotary contact holder at distance r from axis of drum rotation, provided that r is less than R. In internal disks of drum radius slots are arranged opposite to thrusts. Yokes with their openings are installed on cylindrical protrusions of internal and external disks with the possibility of interaction of fork-shaped arms with thrusts of contact holder, passing through radius slots of internal disks, and extended hooks of pressing springs are placed between side walls of yokes and are fixed on "П"-shaped arms of these yokes.

EFFECT: higher efficiency and reliability of short-circuit current disconnection, improved current-limiting properties.

8 dwg