Abstract: An electric switch in which a manually-operable dolly is angularly displaceable about a first axis through a top dead center (TDC) position between the extreme positions towards which it is urged by spring means after passing the TDC position to produce a toggle or snap-action effect, the dolly in one extreme position causing or allowing a movable contact to engage another contact and in the other extreme position causing or allowing the movable contact to disengage the other contact. A tail member is mounted for angular displacement about said first axis and the movable contact is carried on an arm mounted on the tail member intermediate its length for pivotal movement about a second axis parallel to the first axis.

Abstract: The combination of a circuit breaker and an actuating member for the circuit breaker. The actuating device comprises an electric motor operable to displace a pair of actuating arms in opposite directions, one actuating arm being displaced along a path in which it is engageable with the manually-operable member of the circuit breaker to displace the member about its axis in one direction and the other actuating arm being displaced along a path in which it is engageable with the member to displace the member about its axis in the direction opposite to the first direction.

Abstract: A circuit breaker comprises a housing (1) having a first face and an opposed second face, accessible electrical contacts (105, 106, 108, 115) exposed on each of the faces. An electrical connection is provided between at least one of the contacts (105) and an associated contact (106) on the second face. At least one further contact (108, 115) on the second face is engageable with the at least one contact (105, 112) on the first face of an adjacent circuit breaker.