Abstract: A fuse holder (20) is provided that can be installed in the place of a dropout fuse element in an electrical insulating unit (1). The fuse holder has an elongate electrically insulating body providing at least one electrically insulated elongate fuse housing in the form of a passage (21) associated with the body and adapted to receive a fuse wire (22) held under tension therein. The body can be installed in such insulating unit as a replacement to an existing dropout fuse element (5) and itself provides contacts enabling such a conventional dropout fuse element to be installed in the fuse holder body from which it can drop out when the fuse is blown. A switch arrangement is provided for maintaining a fuse in the passage in an inoperative condition whilst a dropout fuse element is functional and for automatically closing an electrical circuit through a fuse installed in said passage when the dropout fuse becomes blown and drops out of the fuse holder.

Abstract: An electric cutout of the link break type includes a fuse holder comprising a hollow fuse tube of insulating material, a lower tube casting secured to one end of the fuse tube, a conducting hinge element pivotally mounted on one side of said lower tube casting and having a pair of coaxial trunnions seated in a pair of jaw contacts constituting one terminal of the cutout, an ejector element pivotally mounted on the conducting hinge element biased away from the fuse tube and having its swing end normally spaced from one end of the fuse tube and substantially normal to the axis of the fuse tube together with a ramp portion angularly disposed to the axis of the fuse tube and to the swing end portion thereof and integral therewith, a fuse link disposed within the fuse tube and having an extension secured to the conducting hinge element and in engagement with the swing end of the ejector element so as to hold the conducting hinge element and the ejector in their normal positions, a manually operable fuse link break

Abstract: A pivot mechanism for drop-out of an electronic sectionalizer tube from an upper contact of mounting structure is arranged so that substantially the entire force released by an actuator fired by a sectionalizer logic circuit immediately causes the tube to drop away and disengage the upper contact. The actuator is mounted on a lower portion of the tube and has a pin that strikes a trunnion pivotally interconnecting a lower contact of the mounting structure and a lower portion of the tube, and the pin of the actuator strikes the trunnion at a location between the pivotal connections of the trunnion so that immediate, downwardly directed motion of the sectionalizer tube away from the upper contact is assured. The pivot mechanism reliably ensures successful drop-out of the tube regardless of adverse environmental conditions and with minimal reliance upon a spring or the effects of gravity.

Abstract: An electrical cutout is disclosed for electrical connection between a line terminal and a load terminal. The cutout includes an insulator having a first and a second end. A first electrical conductor is rigidly secured to the first end of the insulator, the first conductor being electrically connected to the line terminal. A second electrical conductor is rigidly secured to the second end of the insulator, the second conductor being electrically connected to the load terminal. A fuse tube extends between the first and the second conductors and a fuse link extends through the fuse tube and includes a first and a second end. The second end or pigtail of the fuse link is electrically connected to the second electrical conductor. A cap is disposed adjacent the first end of the fuse link, the cap being electrically connected to the first end of the fuse link such that the cap frictionally cooperates with the first conductor.

Abstract: Disclosed is a tool for removing and installing fuses in metal-enclosed switchgear. The switchgear includes one or more fuses and one or more isolating switches and operating mechanisms for isolating the fuses from a high voltage supply circuit. The fuses are mounted between disengageable contacts that connect the fuse between the supply circuit and a load circuit. Access ports are provided through a front panel of the switchgear and are aligned with the fuses for providing access to the fuses. A tool receiving receptacle is mounted on the front panel around the access ports. The tool comprises a hollow metal housing having a hollow interior and having a flange on one end for being received and retained by the receptacle. The receptacle aligns the hollow interior of the metal housing with the access port, and makes grounding connection from the housing to the front panel. The tool also comprises an operating portion including a handle mounted on one end of an insulator.