Abstract: An arc gas controller-insert is used with molded case circuit breaker covers to direct the flow of arc gases that occur during intense overcurrent circuit interruption. The gas controller-insert provides access to the line and load terminal lugs for connection with and disconnection from an associated electrical power distribution system while controlling the egress of the arc gases.

Abstract: An arc gas controller-insert is used with molded case circuit breaker covers to direct the flow of arc gases that occur during intense overcurrent circuit interruption. The gas controller-insert provides access to the line and load terminal lugs for connection with and disconnection from an associated electrical power distribution system while controlling the egress of the arc gases.

Abstract: An emergency push-button comprises a housing and a support rigidly connected to a movable actuation knob and axially movable therewith. The support acts on a releasing mechanism, operated by rotation of the knob about an axis parallel to the movement direction of the movable slider. The button further includes an axially movable member provided with at least one retaining tooth, which, upon lowering of the movable knob, rotates about an axis parallel to the moving direction of the knob, compelling the retaining tooth to release at least one protrusion provided on the housing and, once the movable member has cleared through a tripping action, it also rotates in a tripping manner carrying the retaining tooth to the position under the protrusion, preventing the movable member from moving back to a raised position thereof. The release of the retaining tooth may be obtained just through a rotating movement of the knob in a reversed direction with respect to the retaining movement.

Abstract: A current limiting circuit interrupter consisting of a modular unit housed in an insulating case and provided with two fixed contact arms and two movable contact arms. The movable contact arms can be actuated automatically by means of a rod coupled to an operating mechanism as well as by means of an electromagnetic actuator. The operating mechanism includes a lever and a rotating bracket arranged to hold the movable contacts in an open condition when the electromagnet within the electromagnetic actuator is de-energized.