Abstract: An arc resistant air vent for a switch gear cabinet comprises a plenum stacked with spaced corrugated plates, the plates being perforated by slots at the corrugation turning points. Air and water can enter through a front grille of the vent. Air is allowed to pass through to the cabinet while water entering the vent is returned through the perforations to a bottom wall of the plenum which drains at the grille. The plates are held in frangible connections to the side walls of the plenum and the slots produce an accordion hinge to allow a release and a folding of the plates together under the pressure of an arc blast in the switchgear cabinet to seal the grille.

Abstract: An arc resistant air vent for a switch gear cabinet comprises a plenum stacked with spaced corrugated plates, the plates being perforated by slots at the corrugation turning points. Air and water can enter through a front grille of the vent. Air is allowed to pass through to the cabinet while water entering the vent is returned through the perforations to a bottom wall of the plenum which drains at the grille. The plates are held in frangible connections to the side walls of the plenum and the slots produce an accordion hinge to allow a release and a folding of the plates together under the pressure of an arc blast in the switchgear cabinet to seal the grille.

Abstract: A remotely controlled, motorized drive system for a disconnector used in switchgear. An operator pushes a button on a remote control, which signals a receiver in the disconnector to engage a motor that is coupled to a drive shaft. The drive shaft causes movable contacts of the disconnector to be moved into engagement or out of engagement with sets of fixed contacts in the switchgear that are connected to the line supply and to the circuit breaker that is bolted into the switchgear. One set of contacts is electrically coupled to the line supply, which can carry up to three phases of current. Another set of contacts is connected to corresponding terminals of the circuit breaker. A second motor controls movement of a grounding bar that grounds the circuit breaker to earth. Indicator lights on the switchgear panel indicate the position of the disconnector for visual confirmation of the same.

Abstract: A remotely controlled, motorized drive system for a disconnector used in switchgear. An operator pushes a button on a remote control, which signals a receiver in the disconnector to engage a motor that is coupled to a drive shaft. The drive shaft causes movable contacts of the disconnector to be moved into engagement or out of engagement with sets of fixed contacts in the switchgear that are connected to the line supply and to the circuit breaker that is bolted into the switchgear. One set of contacts is electrically coupled to the line supply, which can carry up to three phases of current. Another set of contacts is connected to corresponding terminals of the circuit breaker. A second motor controls movement of a grounding bar that grounds the circuit breaker to earth. Indicator lights on the switchgear panel indicate the position of the disconnector for visual confirmation of the same.