Vacuum switching tube with metallic switching chamber - has movable contact at end of bar with seal provided by metal bellows element allowing axial displacement

摘要

A vacuum switching tube has an enclosed switch chamber (2) housing a fixed contact (6) with a connector section (4) set into an aperture in the main section (13). Positioned a short distance away from the fixed contact surface a movable contact (7) is supported on a connecting bar (5). The bar passes through an aperture (9) and the housing is sealed by a metal bellows (12) fixed to the bar at one end (14) and the main housing (8) at the other. ADVANTAGE - Simplifies mfr. while improving its external voltage breakdown strength without increasing axial dimensions.