Abstract: Apparatus for remote closing of fuse circuits for overhead power lines is described which apparatus comprises a rod of insulating material for insertion into the bottom of a fuse tube, the rod having a cord attached thereto and extending to the ground for swinging the fuse tube so that the fuse tube can be moved to a position for closing a disconnect, thereby rendering it unnecessary to close a transformer or tip switch from the pole or from a bucket truck. The rod has an enlarged cushioned head and can be removed by releasing the tension on the pulling cord, and the rod will slide out of the fuse tube and fall to the ground.

Abstract: A pull-ring for an electrical device, such as a high-voltage fuse, which may be placed in a mounting. The pull-ring operates a latch, which is capable of holding the fuse closed in the mounting, only when it is reciprocated. The pull-ring is pivotable independently of its reciprocation without affecting the condition of the latch. Accordingly, when a trunnion on the device is in a hinge of the mounting and a pushing force is applied to the pull-ring with a tool to close the device, the natural decrease in the interior angle between the tool and the device can rotate the pull-ring without preventing the latch from holding the device closed. Further, whether the pushing force or a pulling (opening) force is applied to the pull-ring, the direction of application of the force may be adjusted or may naturally change before, during,or after such force application with affecting the ability of the latch to hold the device closed.

Abstract: An electric circuit interrupter arranged to interrupt overload currents and having a pair of relatively movable normally closed disconnect contacts is associated with an electric circuit interrupter arranged to interrupt load currents and having a pair of relatively movable normally closed contacts forming a parallel circuit to the disconnect contacts only during opening of said disconnect contacts so as to prevent arcing at said disconnect contacts during opening thereof.

Abstract: An end fitting for a high-voltage fuse is disclosed. A conductive end ferrule of the fuse has an enlargement formed near one end thereof, the enlargement having a shoulder remote from the fuse end which defines an exhaust port. The end fitting has a pair of arms with slots for selectively engaging or disengaging a fuse mounting and an externally threaded collar between the arms. The collar has an aperture with a shoulder on the wall thereof which engages the shoulder on the fuse so that the fuse end protrudes from the collar. The collar mates with an exhaust control device having a threaded bore therethrough. The bore contains a lip designed to engage the fuse end. When the fuse is inserted through the aperture in the collar so that the shoulders engage each other, the exhaust control device may be screwed onto the collar to trap the enlargement shoulder and the fuse end between the collar shoulder and the lip thereby mounting the arms to the fuse and closing the exhaust port with the exhaust control device.

Abstract: A relatively low cost dual element fuse link including a meltable solder junction has a pair of thermally insulated, serpentine, fusible elements supported on opposite sides of the junction for increasing the heat transferred to the junction by the elements in response to a given current carried by the link such that the junction will be caused to melt at lower current values thereby providing the link with an increased speed ratio. A pair of cylindrical porcelain insulators disposed along respective serpentine elements present the desired thermal insulation as well as provide structural stability to the elements precluding deformation of their serpentine shape when the fuse link is under tension as in a distribution system cutout. The serpentine shape of the elements presents an increased element length which in turn reduces the temperature gradient along the elements thereby reducing axial conductive heat loss from the ends of the elements remote from the solder junction.

Abstract: Load-break switches and current-limiting fuses are often serially connected and placed one above the other. This arrangement is relatively bulky, and involves in particular relatively large requirements in respect to height.The present invention concerns an arrangement of parts wherein the load-break disconnect and the current-limiting fuse are electrically connected in series, but wherein they are arranged spatially in parallel, substantially in coaxial relation, the load-break switch or some of its constituent parts being arranged inside of the current-limiting fuse; or the load-break switch and the current-limiting fuse may be provided with contact means common to both of them.

Abstract: A dropout type fuse cutout is provided having a high current limiting fuse section and a serially connected expulsion fuse section mounted on a conventional dropout toggle linkage arrangement so that fuse action by the expulsion fuse section causes the cutout to dropout and pivot free of the upper terminal. The current limiting fuse section may comprise a helically edge wound fusible member that reduces the terminal-to-terminal distance thereby reducing the length of the current limiting fuse section so that there is a very short external gap.