Abstract: A two component operating handle for opening and closing an electrical switch by a hook stick, the handle including a rigid portion mounted on the operating shaft of the electrical switch and a flexible portion mounted on the outer end of the rigid portion. The flexible portion including a pair of extensions extending outwardly to form an enclosed hook stick opening with the ends of the extensions terminating at a slot at the outer end of the handle so that the hook stick will be released from the opening on bending of one or both of the extensions to open the slot when the rigid portion of the handle engages a fixed stop.

Abstract: A sensor-tripper apparatus for tripping the trip lever of a circuit interrupter in a power distribution circuit, the apparatus including a trip rod mounted in a tube and supported on a frame, a thermally responsive member having a predetermined curie temperature connected in the primary circuit, a magnet assembly mounted for axial movement on the tube and operatively connected to the trip rod, the magnet assembly being attracted to the thermally responsive member and holding a spring in compression whereby on release of the magnet assembly from the thermally responsive member the spring will move the magnet assembly and trip rod to trip the trip lever and a magnetic disk assembly operatively connected to the trip rod and being responsive to a high fault current in the primary circuit to move the trip rod independently of the magnet assembly to trip the trip lever.

Abstract: An installation tool comprising an elongated shaft having a threaded section and a blunt section, the tool having a threaded opening in one end and a hex opening in the other end. The installation tool is used to assemble a loadbreak reducing tap plug including a threaded mounting bolt mounted in the threaded end of the plug, and a threaded cable connector mounted in a visible-break "T" type connector housing, by the following method. Turning the threaded mounting bolt into the threaded opening of the installation tool. Turning the tool threaded section into the cable connector. Turning the tap plug into the cable connector. And removing the tool from the cable connector.

Abstract: A switch apparatus comprising a fixed tubular contact having an inner end, a movable tubular contact having an inner end and being movable between a closed position wherein the inner ends of the contacts overlap and an open position wherein the inner ends of the contacts are spaced apart, a piston fixed to the movable contact for movement thereiwth, a cylinder slideably receiving the piston and cooperating with the piston to define a variable volume pressure chamber which decreases in volume as the movable contact moves from the closed position to the open position, and a housing fixed to the piston and having an inner surface which cooperates with the piston to define an arc chamber containing the inner end of the movable contact, the housing having therein an aperture through which the fixed contact extends when the movable contact is in the closed position, and the arc chamber communicating with the pressure chamber so that gas is forced from the pressure chamber into the arc chamber when the movable conta

Abstract: An arrester for use under oil in an electrical apparatus, the arrester comprising a first contact assembly, a plurality of valve blocks, a second contact assembly, and a conductive cement serially electrically connecting the first contact assembly, each of the plurality of valve blocks, and the second contact assembly. The arrester also includes a thin insulative inert to oil coating completely covering the plurality of valve blocks, the coating and the cement permitting electrical separation of the valve blocks in the event of electrical destruction of the valve blocks.

Abstract: An installation tool for mounting a loadbreak reducing tap plug in a high voltage "T"-type connector of the type including a cable connector having a threaded opening, the plug having a threaded end adapted to be mounted in the threaded opening of the cable connector and a threaded bolt extending through the threaded end of the plug, the threaded bolt having a wrenching opening and being rotated by a wrenching tool for connecting the plug to a bushing, the installation tool comprising a shaft having a threaded end corresponding to the threaded opening in the connector and a threaded opening corresponding to the threaded bolt, whereby the threaded end of the installation tool can be mounted in the threaded opening in the connector, the threaded bolt can be mounted in the threaded opening in the installation tool, and the threaded end of the plug can be drawn into alignment with the threaded opening in the connector when the installation tool is backed out of the threaded opening in the connector.

Abstract: In a transformer primary circuit breaker having a primary switch for opening and closing the transformer primary circuit, an operating handle mounted exteriorly of the transformer for opening and closing the primary switch, a trip mechanism operatively connected to open the primary switch under fault current conditions, the trip mechanism including a conductive metallic sensor element connected in the primary circuit and having a predetermined Curie temperature and a magnet mounted for movement into engagement with the sensor element and biased to open the primary switch when the temperature of the sensor element approaches the Curie temperature, the improvement comprising a shunt circuit connected to the primary circuit in parallel with the sensor element, a normally closed switch in the shunt circuit, a resistance element for limiting the current passing through the shunt circuit, and a tab mounted on the operating handle for opening the shunt circuit switch, a spring mounted in the operating handle for lim

Abstract: A connector for electrically connecting a high voltage cable to an electrical apparatus bushing with a threaded opening, the connector comprising a housing having a passage having one end formed to sealingly engage the bushing, and an electrically conductive cable connecting element positioned in the housing and extending partially into the first passage. The cable connecting element is adapted to be electrically connected to the high voltage cable. The connector also includes a bushing connecting member mounted in the passage and adapted to be rotated. The connecting member includes a body portion electrically connected to the cable connecting element, and a threaded portion connected to the body portion and adapted to engage the threaded opening in the bushing.

Abstract: An installation tool for mounting a loadbreak reducing tap plug in a high voltage "T"-type connector of the type including a cable connector having a threaded opening, the plug having a threaded end adapted to be mounted in the threaded opening of the cable connector and a threaded bolt extending through the threaded end of the plug, the threaded bolt having a wrenching opening and being rotated by a wrenching tool for connecting the plug to a bushing, the installation tool comprising a shaft having a threaded end corresponding to the threaded opening in the connector and a threaded opening corresponding to the threaded bolt, whereby the threaded end of the installation tool can be mounted in the threaded opening in the connector, the threaded bolt can be mounted in the threaded opening in the installation tool, and the threaded end of the plug can be drawn into alignment with the threaded opening in the connector when the installation tool is backed out of the threaded opening in the connector.

Abstract: A first connector is used in connecting or disconnecting a high voltage circuit by engagement or disengagement of the first connector with a second connector supporting a second connector contact element. The first connector comprises an insulative housing having an axial passage including an electrically conductive surface fixedly secured within the housing, and a contact assembly disposed in the passage.

Abstract: A mounting assembly removably supporting an over current fuse package in an opening in a switchgear enclosure. The fuse package having an entry bushing on one side and an internal bushing on the opposite side adapted to connect to a receptacle in the enclosure. The assembly includes a panel for supporting the fuse package in the opening in the enclosure. Clamps mounted on the enclosure for releaseably locking the panel to the enclosure. A lock assembly includes slide support members mounted on the enclosure, bracket members mounted on the panel, a rod rotatably mounted in the bracket members. The rod having a key mounted on each end which is operatively positioned in the slide support members and a bail connected to the rod moving the keys between a locked and an unlocked position with respect to the support members. The bail being inoperable until a cable connector is removed from the entry bushing.

Abstract: A core shunt packet for reducing the telephone influence factor in a transformer of the type having a core formed from strips of magnetic material arranged in end-to-end relation forming a series of staggered gaps at one end of the core, the core shunt packets including one or more steel laminations mounted in an envelope, the envelope being mounted on the side of the core in a position to bridge the gap area on the core with a sheet of insulation located between the envelope and the side of the core.

Abstract: A multiposition rotary transformer switch including a molded switch housing including a bore, an interrupted mounting flange located intermediate the ends of the bore and an interrupted key flange at one end of the bore, the flanges each including slots located at equally spaced intervals, the slots in one flange being offset from the slots in the other flange and a number of fixed contacts mounted on said housing, a dual voltage shaft assembly including a shaft having a drive nut at one end and a pair of floating contacts at the other end, and a tap changer shaft assembly including a shaft having a drive nut at one end and a floating contact at the other end, the shaft assemblies being adapted to be mounted in the bore in the housing and a reversible cap adapted to be mounted on the switch housing to enclose the end of the shaft assemblies in one position and mounted on the drive nut on the shaft in the other position to selectively rotate the shaft assembly with respect to the fixed contacts, the cap being

Abstract: An oil expulsion fuse having a pair of contacts solidly secured to the ends of a high strength outer insulating tube. A resilient non-conducting inner sleeve is mounted within the bore of the insulating tube and contact assembly, the sleeve and tube being closely fit to each other. A fusible link is assembled in the bore of the resilient sleeve secured to the contact ends by fuse clamps. The fusible link includes a support tube also composed of a resilient non-conductive material which together with the inner sleeve absorb and trap high energy fuse link particles during a fusing operation.

Abstract: An under oil expulsion fuse cartridge assembly includes a tubular housing of non-electrical conductive material, an electrically conductive contact removably threadedly mounted on each end of the housing, and a replaceable fuse assembly removably received within the tubular housing. One of the end contacts incorporates a pressure chamber providing a flushing and cleaning operation during the interruption process. The fuse assembly includes a fuse liner tube in a fuse link therein in the form of a flat ribbon element electrially connected to each of the end contacts. One end of the fuse link is mounted on a thin disc which includes a plurality of projecting lands that prevent direct engagement of the fuse link with the end contact to avoid breaking the fuse link. The fuse link also includes a plurality of holes formed therethrough covered by a eutectic material having a desired melting temperature so that current interruption occurs at a predetermined operating temperature.

Abstract: A modular under oil expulsion fuse cartridge assembly includes a tubular housing of non-electrical conductive material, an electrically conductive contact removably threadedly mounted on each end of the housing, and a replaceable fuse assembly removably slidably received within the tubular housing. The fuse assembly includes a fuse support tube and a fuse link supported within the tube electrically connected to each of the end contacts. The end contacts are designed with ramps or tapered ends to prevent arcing along the insulating surface of the fuse housing, and are located on the outside housing surface of the device away from the operating or arcing region of the assembly to provide a maximum strike distance between the end contacts.

Abstract: A quick latch mounting device for securing a standoff device to a standoff bracket used in electrical power distribution systems. The mounting device includes a mounting member attachable to the standoff device and movable in a horizontal plane between a first position clamped to the bracket and a second unclamped position, and an actuator having either a cam or a lever for movement in a vertical plane. A clamping member is carried by the mounting member and operatively couples the actuator and the mounting member. The clamping member is slidably movable relative to the mounting member along oblique sliding interfaces to translate the vertical movement of the actuator into the horizontal movement of the mounting member so that the mounting member may be firmly clamped or unclamped to the bracket.

Abstract: A primary power circuit breaker adapted to be immersed in the dielectric fluid for a transformer, the breaker including an arc interrupting assembly for extinguishing the arc produced on load break; a trip free mechanism responsive to primary, secondary or primary-secondary differential current signals and thermally responsive to fluid temperature, and an externally operable reset assembly for closing the circuit breaker.

Abstract: An underoil primary circuit breaker having a fixed contact assembly and a rod contact, a trip-free latch mechanism for moving the rod contact toward and away from the fixed contact, a temperature responsive magnetically controlled trip assembly for releasing the latch mechanism, and cross blast car interrupter for extinguishing the arc produced between the rod contact and fixed contact assembly, the interrupter including a core formed from an arc extinguishing material and defining within a reinforced case a pressure chamber, a pressure relief chamber, an arc passage connected to the pressure chamber and a vent passage connected to the vent chamber; high and low pressure exhaust ports are provided between the arc passage and the vent passage and a throttling tube is provided in the pressure relief chamber to vent gases into the transformer.

Abstract: A low oil lock-out and/or trip apparatus for a submersible transformer circuit breaker of the type having a manually operated crank shaft assembly for opening and closing the circuit breaker and a fault trip assembly for opening the circuit breaker under fault current conditions, the apparatus including a float assembly which is responsive to changes in oil level in said transformer and a rod carried by said float for blocking the movement of the crankshaft and a trip member for tripping the trip assembly when the oil level drops below a predetermined level in the transformer.