Abstract: A plug-in type contact arrangement for high power electrical apparatus such as switch gear, wherein a fixed contact member carries a plurality of contact fingers having roller contacts mounted at one end thereof for reliably contacting a movable contact member when such movable contact member is forced into a contacting relationship with the fixed contact member and entering the cage-like receptacle formed by the circularly arranged contact fingers, and wherein the contact fingers are crimped at a predetermined point forming a first longitudinal portion and a second longitudinal portion arranged in different axial planes and connected by the crimping region, thereby transforming the contact pressure formed between the movable contact member and the roller contacts into a torsional load exerted on the contact fingers.

Abstract: A vacuum switching apparatus having a pair of terminal members extending from a housing made from a fully solid insulating material such as epoxy resin, and forming an outer housing for the vacuum switching apparatus, into which a vacuum switching chamber is placed housing a fixed and a movable contact member, the movable contact member extending through metallic bellows into a sliding contact and into the coupling terminal, wherein a pair of control electrodes each being conductively coupled to a different one of the terminal members is embedded into the fully solid insulating housing and lying at the potential of the respective terminal members, a further control electrode placed in the insulating housing and lying in a region so that it will assume an intermediate potential between the terminal potentials and the ground potential and wherein further a grounded outer metallic casing encloses insulating housing.