Abstract: A circuit interrupter movable among ON, OFF, and TRIP positions includes a housing, a latch situated on the housing, a number of mechanisms situated on the housing, each mechanism of the number of mechanisms including a contact arm that is movable with respect to the housing, a set of separable contacts including a stationary contact and further including a movable contact situated on the contact arm, a handle, a pin, a first spring that extends between the contact arm and the handle in at least one of the OFF position and the ON position, a second spring that extends between the handle and the pin, and the pin being movable among a position engaged with the latch in at least one of the ON position and the OFF position and another position engaged with the handle in the TRIP position.

Abstract: An electrical circuit breaker with separable electrical contacts includes a fixed electrical contact, a mobile electrical contact, that can be displaced between open and closed positions and including several electrical contact fingers, arranged aligned along a row and that can be displaced relative to the mobile electrical contact, several bearing members, each associated with a contact finger to exert a force on this contact finger in order to displace it. The bearing members associated with the contact fingers situated in lateral end zones of the row exhibit a higher stiffness than the bearing members associated with the contact fingers situated in a central part of the row.

Abstract: In order to reduce the breaking energy of a high-voltage or medium-voltage circuit-breaker, the interrupting chamber (10) contains two contacts (12, 14) mounted to move in opposite directions, and actuated via a single device (20). The two contacts (12, 14) are surrounded by an insulating casing (18) of tubular shape, coupled in fixed manner to the main contact (12). The contacts (12, 14) are actuated by a device having a lever (24) in which each lever arm is coupled to a link, one of the links (32) being secured to the insulating casing (18) and the other link (34) being secured to the second contact (14). The guiding of the drive tube (18) on the main contacts (12b, 14b) makes it possible to improve breaking by keeping clean gas between said main contacts.