Abstract: A limiter includes a housing having a first surface and a second surface, a line terminal, a load terminal, a fusible conductor electrically connected between the line and load terminals and an indicator button disposed proximate the first surface. The button includes a first end and a second end having a first opening, a second opening and a conduit therein between the first and second openings. The fusible conductor passes from the first terminal, through the first opening, through the conduit, through the second opening, and to the load terminal. A spring biases the button away from the first surface. The fusible conductor, when electrically connected between the line and load terminals, holds the second end proximate the first surface. The spring, when the fusible conductor is electrically disconnected from one or both of the terminals, moves the button away from the first surface and toward the second surface.

Abstract: A circuit breaker includes a housing, separable contacts disposed in the housing, a latchable operating mechanism structured to separate the separable contacts, and a magnetic trip mechanism coupled to the latchable operating mechanism. The magnetic trip mechanism includes a plunger assembly support structure and a plunger assembly having a moveable core. The plunger assembly support structure includes a wall having a slot therein. The moveable core rests in the slot. A positioning member has a hook and an opening. The hook engages the wall of the plunger assembly support structure. The moveable core passes through the opening of the positioning member, which retains the moveable core relative to the plunger assembly support structure.

Abstract: A main valve for an arc chute is formed by a flexible sheet member that is mounted over a gas opening of the arc chamber structure by extensions on arc plates that form guides received in elongated slots in the ends of the flexible sheet member. The force generated by high pressure gas in the arc chamber on the center of the flexible sheet member causes it to bow allowing arc gases to escape laterally as the ends of the flexible sheet member are drawn towards each other. Flaps formed by slits in the flexible sheet member are deflected by lower pressure gas before the flexible sheet member bows outward.

Abstract: A circuit breaker includes a housing, separable contacts disposed in the housing, a latchable operating mechanism structured to separate the separable contacts, and a magnetic trip mechanism coupled to the latchable operating mechanism. The magnetic trip mechanism includes a plunger assembly support structure and a plunger assembly having a moveable core. The plunger assembly support structure includes a wall having a slot therein. The moveable core rests in the slot. A positioning member has a hook and an opening. The hook engages the wall of the plunger assembly support structure. The moveable core passes through the opening of the positioning member, which retains the moveable core relative to the plunger assembly support structure.