Abstract: An electronic sectionalizer includes mounting structure including first and second electrical contacts spaced from one another and electrically conductive structure having an external surface and provided with first and second electrical terminals adapted to engage the first and second electrical contacts of the mounting structure in a closed condition of thesectionalizer. The sectionalizer provides for the release of the electrically conductive structure from engagement with at least the first electrical contact to permit the electrically conductive structure to move from the closed position to an open position, and an actuator is provided for actuating the release. A detector is provided to detect a predetermined condition in the sectionalizier and the actuator is controlled in response to the detection by an electronic control circuit mounted to the external surface of the conductor.

Abstract: A high speed fuse 8 having terminals 14 staked to non-electrically conductive end bells 12 with fusible element 30 connected to ridges 44 on terminal 14 by projection welding, and round balls 18 plugging sand holes 20.

Abstract: Disclosed herein is a mounting structure of a reed switch in an eddy-current-type indicator which can realize to lessen an operation vibration sound of the reed switch. The mounting structure comprises a housing, a magnet rotatably provided in the housing, a pair of terminals mounted on the housing, a reed switch for detecting the number of the rotation of the magnet by generating pulse corresponding to the rotation of the magnet, the reed switch having a pair of leg portions electrically connected to the terminals, respectively, and cushion members for preventing vibration generated in the reed switch when it is operated from being transmitted to the housing and terminals. The cushion members elastically contact with the leg portions of the reed switch, so that the operation vibration is absorbed by the cushion members.

Abstract: A high temperature fluid sensor has a fusible detector including a body having longitudinally extending conductors therein. A first portion of the conductors is confined within the body whereas a second portion of the conductors projects from an end of the body. The second conductor portions are spaced-apart to define a void therebetween. A fusible material is engaged with, and electrically bridges between the second conductor portions. A tapered portion of the sensor permits the molten fusible material to flow away from the second conductor portions. The tapered portion terminates in spaced-apart relationship with the fusible material and thus further defines the void.

Abstract: A two pole breaker employs molded resinous parts including a base and support frame structure. Supported to a medial plane frame by a pin is a rocker handle having a linkage crank arm at each side of the medial plane and a rotatable latch lever having trip surfaces accessible to a bi-metallic overload actuator of each pole. A rocker member generally transverse to the normal position of the latch lever has a latch surface which cooperates with a latch keeper on the latch lever which is held engaged by a spring between the latch lever and the medial plane. The rocker has parallel side members, each supporting a switch actuator surface on each side of the medial plane frame. Identical linkage connections on each side of the medial plane connect the crank arms to the respective side pieces of the rocker.

Abstract: Magnetic field generators used in magnetic resonance imaging instruments (MRI) need an extremely uniform and wide magnetic field space. With the annulus of a field-generating annular magnet composed of a plurality of permanent magnet blocks arranged annularly, non-magnetic hold plates may be arranged in correspondence with each of the permanent magnet blocks, and field-regulating permanent magnet pieces may be fixed at stated positions of the hold plated, thereby obtaining a uniform magnetic field space.

Abstract: A method of manufacturing a fuse includes wrapping the fuse element on an insulating bridge. The ends of the bridge include a metal foil coating which helps increase the conductivity and reliability of the solder bond between the fuse element and end ferrule.

Abstract: A temperature safety device includes an electrically insulative support, electrical connectors extending outwardly of the support, first and second contact elements having first fixed ends connected with the electrical connectors and free ends engageable to provide a switch within the support in series circuit with the electrical connectors. A melt material insert adapted for heat transfer relation with apparatus being protected by the safety device, is included and a mechanical force transfer element is disposed between the insert and the second contact element, applying force thereto to effect closure of the contact elements in part attributable to counter-forces exerted by the contact elements.

Abstract: A protected electric switching apparatus is provided and its fixing device, comprising a contactor with a latch for engaging a profiled rail and with which a removable thermal relay is associated by means of conducting pins. A channel is formed between two opposite walls so as to allow a screwdriver to have access to an eye of this latch.

Abstract: A ceramic coating for a subminiature fuse includes sodium silicate and silicon dioxide applied over a subminiature fuse wire in slurry form. The coating gives the fuse arc quenching properties.

Abstract: A circuit breaker having the generally rectangular case with an actuating switch handle on one edge and terminals at the opposite edge is provided with an auxiliary switch receptacle at the edge by the terminal. Retainer means is provided for holding the auxiliary switch in the receptacle and an access opening is provided through the edge wall for communication between the switch actuating member and a portion of the breaker mechanism moving in response to breaker contact opening and closing. A U-shaped retainer is preferably used to retain the switch in the receptacle by passing prongs thereof through the holes in the switch walls and the aligned switch holes. The actuator member may be in accordance with various types of mechanisms, either a compressible member or a rigid slide, and in either case is moved by the breaker mechanism into the actuating means of the switch.

Abstract: A circuit breaker comprises a compensator bimetal and a main bimetal which deflect in the same direction when heated. Each bimetal carries an electrical contact, which are normally in contact with each other. Upon overload, the contacts open. However, opening of the contacts causes electric current to flow through a heater wire wrapped around the armature bimetal, thereby keeping the main bimetal deflected and keeping the contacts apart.

Abstract: A microfuse (10) with a ceramic chip (12), thick film pads (14), fusible wire (16), attached to pads (14) without solder or flux, in an insulating enclosure or fuse tube (40). Ferrules (42) are attached to metallized areas (14) with solder (44). Performance and manufacturing of fuse (10) is improved by utilizing a wire bonding technique to improve the quality of the manufacturing process and increase the reliability of the fuse, and to reduce manufacturing cost.

Abstract: A circuit breaker having two subassemblies, connected via snap-lock means, which mesh together to provide manual operation with "trip free" response to overloads and no latch load on the bimetallic element.

Abstract: Apparatus for adjusting the calibration of a thermal trip unit which is to be used in conjunction with an electrical circuit breaker. A rotatable knob is provided which adjusts the trip unit to between one hundred percent of the rating of the circuit breaker and some value which is less than one hundred percent. An adjustable stop screw is provided to engage the rotatable knob when the knob is rotated to adjust the calibration of the trip unit to the desired value which is less than one hundred percent of the rating of the breaker. The adjustable stop screw thereby limits travel of the adjustable knob between only one hundred percent of the rating of the circuit breaker and the desired value which is less than one hundred percent.

Abstract: A chip-type micro-fuse including a fusible element, a hollow body made of heat-resistant and insulative materials having at lesat two recesses which are respectively formed on an outer peripheral surface thereof, near the ends thereof and two end caps adapted to respectively cover the ends of the body for electrically connecting the body with external circuits. The end portions of the fusible element are respectively connected at the recesses to the end portions of the body. Further, the recess defined near one end portion of the body is positioned diagonally spaced with respect to another recess defined near the other end of the body. Thus, the fusible element is diagonally stretched between the ends of the body across the inner space of the body. When assembled, the end portions of the fusible element are respectively drawn out from the interior of the fuse without damaging the fusible element and connected at the recesses to the body.

Abstract: A miniature cartridge-type fuse comprises a sub-assembly of an inner insulating housing made of a transparent glass or glass-like material which cannot withstand the forces of a short circuit overload, and end cap terminals at the ends of the housing. A transparent encapsulating body is preferably molded immovably around the inner housing and covers, seals and physically interconnects the exposed exterior surfaces of the inner housing and terminals. The encapsulating body prevents the hazardous destruction of the fuse under all overload conditions and enables the fuse element to be seen through the encapsulation body and inner housing.

Abstract: Driving element (1) comprising a thin part (2) provided with a zone, ductile in the direction of its thickness in such a way as to occupy at least two positions, in at least one of which said zone is arc-shaped, at least one tab (3,4) fixed at one end to a face of said ductile zone and extending towards the central part of the zone in such a way that, when the zone is moulded, the free end (8,9) of said tab moves away from or towards the face (5) of said thin part, the resulting amplitude of the movement of the free end of the tab being greater than the amplitude of ductility of the thin piece.

Abstract: A thermally responsive switch used in enclosed motor-compressors includes a supporter formed of a single metallic plate and including a support arm cantilever mounting a thermally responsive bimetallic or trimetallic element carrying a movable contact at one end, first and second beams disposed in a relation that the support arm is interposed between these beams, and an operative temperature calibration strip integrally extended from the first beam. The calibration strip is slidably inserted between the support arm and the second beam into a wedge structure in the state that the calibration strip is bent at the root portion. Consequently, when the calibration strip is bent with the slidable movement, the support arm is bent so that the contact pressure between the contacts is set, an amount of bending deformation of the support arm corresponding to an amount of bending deformation of the calibration strip.

Abstract: A relay has an elongated rocking armature which is mounted on a coil assembly having a centrally located fulcrum about which the armature seesaws. The coil assembly nests in, and is supported by an insulating mounting block. A cover fits over the entire assembly and extends far enough beyond the bottom of the mounting block to form a retaining wall for receiving a sealant which may be poured therein and which thereafter solidifes. The sealant flows through holes in the mounting block and locks the coil assembly in place by integrally joining the block and coil assembly. Arms are formed on the four corners of the armature assembly, immediately over cantilever electrical contact springs. As the armature rocks, the arms affect the vibrations of the cantilever spring. That is, when the springs flex in a direction away from the arms, the effective vibrating length is the entire length of the springs.