Abstract: Provided is a feed mechanism that has a small number of parts and that is suitable for downsizing. A feed mechanism (1) includes: a base (2); a movable body (3); a feed screw (4) configured to move the movable body (3) relative to the base (2); and a torque generation member (15) formed with a female thread (15b) that is threadedly engaged with the feed screw (4). The movable body (3) is formed with a housing hole (12) extending in a direction orthogonal to the feed screw (4), and the torque generation member (15) is housed in the housing hole (12).

Abstract: A circuit interrupter includes an arc extinction assembly for magnetically driving or blowing out an arc formed between a stationary contact and a movable contact. The assembly comprises a pair of coaxial windings which are disposed in proximity to the contacts so that the internal lines of magnetic force generated by and passing inside of the windings can act directly on the arc for magnetically driving the arc in one direction. A magnetic flux diverting yoke is provided in association with the windings to diverse therethrough the external lines of magnetic force generated by and passing outside of the windings such that the arc and a portion of the movable contact arm carrying the same will not be under the influence of the external lines of magnetic force even when the contact separation proceeds to a stage where the arc is extended past the region which is totally under the influence of the internal lines of magnetic force.