Load circuit breaker, has vacuum switching tube displaceably arranged in fixed housing such that cam plate is coupled with movable contact to move contact terminal bolt of switching tube against aperture spring and contact pressure spring

摘要

The breaker (1) has a main contact system (2) comprising a circuit breaker fixed contact (3) and a circuit breaker movable contact (4) for forming an isolation barrier in an off position, and a vacuum switching tube (8) for extinguishing electric arcs. The vacuum switching tube is displaceably arranged in a fixed housing (15) such that a cam plate (17) is mechanically coupled with the movable contact for moving a movable contact terminal bolt (7) of the switching tube against an aperture spring (20) and a contact pressure spring (21).