Spring Operated Actuator For An Electric Apparatus

The spring operated actuator according to clam 1, wherein the working chamber is formed by an outer wall, an inner wall and first and second side walls and in that the housing parts meet each other along the outer wall and the inner wall.

An electrical switching apparatus including an actuating spring to provide an actuating movement of the switching apparatus and a rotary air damper connected to other, and which damper is arranged to decelerate the actuating movement during at least an end portion of the actuating movement, the damper having a toroidal working chamber with internal walls formed by two circumferential housing parts which are rotatable relative to each other and are meeting each other such that a first and a second gab are formed between them where they meet each other, and having seal means between the two housing parts, which seal means overbridges the respective gap and includes a first circumferential seal the first gap and a second circumferential seal at the second gap, wherein at least one of said first and second seals includes a sealing body fitted in a groove formed in at least one of the internal walls of the two housing parts at a location where they meet each other which seating body has a sealing surface facing the working chamber, which sealing surface has an extension in the direction perpendicular to the circumferential direction and to the radial direction that is larger than the maximal gap between the housing parts and which sealing surface is substantially aligned with a wall surface.