Abstract: The overcurrent protection structure according to the present invention mainly comprises a fusible fuse structure unit disposed in a coating, and the both ends of the fusible fuse structure unit extend outwardly beyond the coating and form a first electrode and a second electrode. In the manufacturing process, the gas-assisted injection molding process enables at least one space for accommodating gas disposed between the fusible fuse structure unit and the coating such that the heat generated by the electrically energized the fusible fuse structure unit will not dissipate through the heat conduction of the coating in order to ensure that it will blow at high temperature when reaching a specific current or a specific temperature and the circuit protection effect.

Abstract: A fuse assembly is disclosed. The fuse assembly includes an electrically insulating hollow casing of a substantially rectangular parallelepiped shape in outline, a fuse element provided within the casing and supported by the casing, the casing having first and second spheroidal concaves provided therein for facilitating reflecting and converging of shock waves into focuses at the time when an arc discharge is generated due to blowing of the fuse element and the shock waves are then produced, the first and second spheroidal concaves being disposed side by side along a longitudinal direction of the casing and overlapping each other in the longitudinal direction of the casing in such a manner that inner foci of the concaves are overlapped with each other, and a pair of spaced apart electrodes provided at both ends of the casing, the fuse element being electrically connected to the spaced apart electrodes and bridged between the spaced apart electrodes.

Abstract: In a fuse chamber (8) there is arranged as a quenching gas source a burn-off element (11), which concentrically surrounds an arc chamber (10) and is separated from it by a fuse element (9), which consists of metal foil, preferably silver foil, and the outer side of which is adjoined by the burn-off element (11). The latter consists of an igniting material (12), arranged in the form of a ring running around centrally, and a gas-evolving material (13). Both materials consist, for example, of guanidine or guanidine derivatives as the combustible material and an oxidant, the proportion of which in the igniting material (12) is hyperstoichiometric. The arc chamber (10) is bounded at opposite ends by nozzles (7a,b), which connect it to exhaust volumes (4a,b). When there is an overcurrent, the fuse element (9) heats up to the igniting temperature of the igniting material (12) and is torn open centrally.

Abstract: The invention is a blade fuse having a housing section and a fusible element. The housing includes an insulating portion or tab extending from the housing section, and disposed between opposite ends of the fusible element. One aspect of the invention is a blade fuse where the insulating tab is integral with the housing. The insulating tab may be integral with the head portion of the housing, and the insulating tab may extend downwardly from the head portion. In yet another embodiment, the invention is directed to a one-piece, metallic element for a blade fuse. The blade fuse element has a fusible link and a pair of terminals. The fusible element extends above, rather than between, the terminals.

Abstract: An exhaust control device for use with a circuit interrupter includes a casing having a first expansion chamber and a second expansion chamber that are operationally disposed upstream of a heat sink and a damper, with the second expansion chamber being in fluid communication with the first expansion chamber and being in register with an inlet of the casing. The first expansion chamber extends between the inlet and the heat sink. The heat sink is a porous member that is annular in cross-section and includes a central cavity formed therein, the second expansion chamber being disposed in the central cavity. The first and second expansion chambers are configured to separate a blast of gases from the circuit interrupter into first and second pressure waves that sequentially travel through the heat sink and the damper, which reduces the peak intensity of the blast, extends its duration, and reduces its ionization level.

Abstract: A fuse 1 includes a pair of terminals 2, a housing 4 and a fusible body 5. The one ends 3a of the terminals 2 are housed within the housing 4. The housing 4 includes a pair of end walls 12a, 12b, a pair of side walls 13a, 13b, a first partition wall 21 and a pair of second partition walls 22. The inner faces 15a, 15b of the pair of end walls 12a, 12b are opposite to each other in a direction orthogonal to the direction of arranging the terminals in parallel and extend along the end faces of the terminals. The inner faces 16a, 16b of the side walls 13a, 13b are opposite to each other in a direction of arranging the terminals in parallel. The first partition wall 21 is located between the pair of terminals 2. The pair of second partition walls 22 are located between the first partition wall and the inner faces 16a, 16b, respectively.

Abstract: In a fuse chamber (8) there is arranged as a quenching gas source a burn-off element (11), which concentrically surrounds an arc chamber (10) and is separated from it by a fuse element (9), which consists of metal foil, preferably silver foil, and the outer side of which is adjoined by the burn-off element (11). The latter consists of an igniting material (12), arranged in the form of a ring running around centrally, and a gas-evolving material (13). Both materials consist, for example, of guanidine or guanidine derivatives as the combustible material and an oxidant, the proportion of which in the igniting material (12) is hyperstoichiometric. The arc chamber (10) is bounded at opposite ends by nozzles (7a,b), which connect it to exhaust volumes (4a,b). When there is an overcurrent, the fuse element (9) heats up to the igniting temperature of the igniting material (12) and is torn open centrally.

Abstract: The invention is a housing for a blade fuse, and a blade fuse that uses that housing. The housing includes a first generally planar wall and a second generally planar wall. The first and the second generally planar walls each have an outer surface and an inner surface, and the inner surface of the first generally planar wall faces the inner surface of the second generally planar wall. Each of the generally planar walls has at least one rib extending from its inner surfaces. The one or more rib on the inner surface of the first generally planar wall extends towards, and is generally aligned with, the one or more corresponding rib on the inner surface of the second generally planar wall. These generally aligned rib sets form a gap, and the gap is sized so as to permit the close-fitting insertion of a fuse element between that gap.

Abstract: A fuse assembly including a housing and a fuse element which fuses open for protection against overcurrent or short-circuit current flows. The fuse assembly also includes reflecting means such as metal polished surfaces for reflecting radiation rays generated from the fuse element back to the fuse element. The reflecting means may be formed from separate parts interposed between the fuse element and the inner wall of the housing. Alternatively, the reflecting means may be formed by applying a metal plating on a surface of an inner wall of the housing to give a mirror-like appearance to the surface.

Abstract: A micro-chip fuse and a method of manufacturing the fuse is disclosed which includes a fusible element made of a metallic film that is formed by a depositioning process. Through-bores are provided through a first substrate and filled with a photosensitive resist to make smooth the surface of the first substrate. After curing the resist, metal is deposited on the surface of the first substrate to form a metallic film. A photosensitive resist is applied to the metallic film and a photomask is placed on the resist to effect an exposure and a development. The metallic film is etched and the resists are removed to form the fusible elements made of the metallic film extending over the through-bores. A second substrate is placed under the first substrate, and a third substrate including recesses for cover the through-bores is placed on the first substrate to laminate them. Electrodes are provided on the ends of the substrates. The laminated substrates are divided into individual micro-chip fuses.

Abstract: Fuses and a subassembly component for fuses. The fuse includes an insulating housing, a short circuit fusible element, and an arc barrier-forming body. The arc barrier-forming body is fitted around, and intimately surrounds a portion of the short-circuit fusible element. The arc barrier-forming body is formed from a silicone rubber sealant which is free flowing at room temperature but upon exposure to air increases in viscosity until it essentially becomes a solid. The arc barrier-forming body provides protection against "burn-back" within the fuse.

Abstract: An overcurrent protection device and a method for the production thereof is provided wherein a fusible link is bonded across a pair of electrodes. A composite layer envelops the fusible link and is formed from a gelatinous composition. The composite layer and the fusible link are further encased within a molded housing. The gelatinous composition includes a nonconductive inorganic powder and a synthetic resin. The inorganic powder has a melting temperature below a fusion temperature of the fusible link. In an embodiment, the inorganic powder includes lead glass powder and alumina powder, and the synthetic resin is a low viscosity silicone resin. The inorganic powder is mixed with the silicone resin in a three to one ratio. Heat treatment dries the composite layer. The composite layer includes air pockets between particles of the inorganic powder elastically bound together by the synthetic resin.

Abstract: A high breaking capacity micro-fuse includes a body having a wall which forms a cavity in a body, pair of conductive terminals extending through the wall, and a fusible element extending between the pair of conductive terminals and connected thereto in the cavity. An insulating member with a hole through which the fusible element extends has a shape by which a space is provided between the inner surface of the wall of the body and the insulating member when the insulating member is disposed in the cavity of the body.

Abstract: A fuse having a rated current for protecting electric or electronic circuitry comprises a body having a blow chamber. A fusible element is contained within the body and extends through the blow chamber. A contact is disposed on the body electrically connected to the fusible element for making an electrical connection between the fuse and the circuitry. The blow chamber is sealed around the fusible element so that thermal energy in the fusible element can increase within the blow chamber for causing the element to open when an elevated current is applied to the element. The blow chamber is sufficiently sealed around the element for retaining a pressure created therewithin by vaporization of a portion of the element; that pressure is sufficient to cause an arc produced by fusion of the element to extinguish. The body is of sufficient strength to contain the pressure within the blow chamber for allowing the fuse to fail gracefully.

Abstract: A subminiature fuse has a housing in which more than one enclosed arc-extinguishing chambers are in series provided with partitions inbetween and one or more than one small hole communicating with the more than one arc-extinguishing chambers in series are provided at the respective partitions, a pair of lead terminals being fixed to the housing in such a manner as the respective fuse wire connecting portions of the lead terminals are accommodated in the respective opposite end arc-extinguishing chambers and the portions of a pair of lead terminals for connection with an external circuit are projected out of the housing, a fuse wire being extended between the fuse wire connecting portions of the pair of lead terminals through the small hole of the respective partitions, the opposite ends of the fuse wire being electrically and mechanically connected respectively to the pair of the lead terminals, whereby the fuse is capable of providing a high breaking characteristics and quickly melting to sever the fuse wire

Abstract: An electrically conductive expulsion fuse manifold and bus for connecting and mounting a plurality of fuses which upon operation expel gases into the manifold is shown and described. The expulsion fuses are attached to the manifold by means of clamps, flanges, and/or threaded connections. Each expulsion fuse includes an expendable cap which may be blown off into the manifold under high magnitude capacitor discharge currents and/or fault currents for safe double-vented fuse operation. The manifold may also be non-conductive where electrical isolation is required and where a separate electrically conductive bus is employed.

Abstract: A high power current-limiting fuse comprises a cylindrical envelope which closely surrounds a metallic fusible element in the form of a wire or ribbon. The cylindrical envelope is made of high density rigid ceramic such as Alumina of formula Al.sub.2 O.sub.3, and Beryllium oxide of formula BeO. The two ends of the envelope are metallized to form two terminals respectively connected to the ends of the fusible element, whereby the current-limiting fuse is connectable to an electric circuit to be protected through the two so formed terminals. A sheath of fiberglass or ceramic can be mounted around the cylindrical envelope so as to increase the mechanical rigidity of the current-limiting fuse.

Abstract: An electric fuse for high voltage circuit comprises an insulative tubular casing closed at both ends with metal caps and has an insulative cylindrical member within said tubular casing disposed eccentrically and is offset relative to the major axis of said tubular casing so as to define an annular space therewith which is non-uniform in width. The annular space has a wider portion on one side of said tubular member and a narrower portion on the other side thereof. A fusible element is stretched in said narrower portion of said annular space and is secured at both ends to said metal caps.

Abstract: An electrical switch includes an alternating series of first and second switch cells. Each first cell includes a first conductive member with a first bore and a first insulative member conformally located in the first bore and movable through the first bore. Each second cell includes a second insulative member with a second bore and a second conductive member conformally located in the second bore and movable through the second bore. The first and second bores have substantially the same cross-section. The cells are mounted end-to-end in the alternating series so that the bores align. Severable diaphragms electrically interconnect the second conductive member of each second cell to the first conductive member of the first cells adjacent to the second cell. The first insulative members and the second conductive members are simultaneously moved to simultaneously sever the diaphragms. A plurality of insulated gaps are thereby produced between the first and second conductive members of adjacent cells.

Abstract: An overload fuse with a fusible conductor and quenching baffles is curved preferably forming a partial annulus, and several quenching baffles are disposed perpendicular to the fusible conductor. Due to its flat design, this fuse has only a small volume and at the same time a large switching capacity because the partial arcs formed between the quenching baffles are driven radially outward by the dynamic forces and are lengthened accordingly.

Abstract: A protective fuse comprising a fusible element disposed within an enclosure formed by a gas generating fiber tube connected at one end to a conductor rod and at the other end to an arc intercepting member. The arc intercepting member is connected to an elongated tubular resistor element which in turn is connected at its opposite end to a cap comprising a conductor connected to the fusible element. Upon parting of the fusible element an arc established by the fault current comes into contact with the arc intercepting member so that a circuit is established through the resistor element thereby momentarily reducing the fault current to a level which can be extinguished by the deionizing gases generated within the interior of the fuse. The conductor rod is formed of a magnetic material which is capable of generating a substantial magnetic flux which functions to bias the arc against the interior wall of the fiber tube to enhance the generation of deionizing gases.

Abstract: A single-vented fuse tube has a bore lined with an arc-extinguishing material. A movable contact moves away from a stationary contact in the bore and toward and out of an exhaust opening. An arc established between the contacts causes de-ionizing arc-extinguishing gases to evolve from the bore. The gas is exhausted from the exhaust opening. The bore is mildly tapered--to about 1.degree. to 3.degree. of included angle--so that its greatest diameter is at the exhaust opening. The included angle and extent of the taper are sufficient to obviate stagnation of the gases evolved deep within the bore and clogging of the bore.

Abstract: An improved fuse tube for a high voltage fuse contact used to interrupt low and high fault currents. The fuse tube has an arc-extinguishing bore into which a fuse link is insertable. The fuse link includes an arc-extinguishing sheath surrounding a pair of separable terminals and a fusible element normally between the terminals. An arc established and elongated between the separating terminals after the fusible element melts and decomposes the bore, the sheath, or both to rapidly evolve large amounts of arc-extinguishing gases which are exhausted from an open end of the bore. A conductive chamber in the bore is electrically connected with one of the terminals and surrounds a portion of the sheath and the terminals. A mild taper is formed in the bore so that its larger end is at the open bore end. The chamber permits the fuse link to be positioned deep within the bore so that low fuse current interruption is not compromised.

Abstract: An improved circuit-interrupting device of the type which includes an arcing rod which is moved away from a stationary contact in response to an overcurrent through the device. The device includes a container of pressurized dielectric fluid having a port from which the fluid is directed at an elongating arc formed between the moving arcing rod and the stationary contact. The device also includes a diaphragm normally contacted by the arcing rod which normally closes the port and restrains arcing rod movement. The improvement includes a pattern of reduced thickness in the diaphragm about the point of contact between the diaphragm and the arcing rod. The pattern may be circular or star-shaped and may be produced by pressing, dieing, stamping, scoring, forming, etching, or coating. Depending on the specific construction of the device, the diaphragm either fuses or melts along the pattern or is ruptured or torn by arcing rod movement following an overcurrent through the device.

Abstract: An electric fuse including a fusible element, a filler in which said element is embedded, a pair of electroconductive terminal elements arranged at the ends of said fusible element and conductively interconnected by said fusible element. The fuse further includes a tubular casing supporting said pair of terminal elements on the ends thereof. Said casing consists of a plurality of stripes of a glass fiber material rolled to cylindrical shape overlapping along the longitudinal edges thereof and impregnated with a polyester resin. The innermost surface of said casing is lined with Johns-Manville "Quintex II".

Abstract: An expulsion type fuse is taught which has an opening in the bottom thereof from which hot gases may exit during a fusing operation. The hot gases are provided to a condenser which is disposed adjacent the exit of the expulsion fuse. The disposition of the condenser relative to the fuse is such that none of the gas escapes to any region outside of the expulsion fuse other than the condenser. The condenser has a central axial opening around which is an annularly disposed copper screen. Around the outer periphery of the copper screen is disposed a relatively thin layer of plastic material which may rupture because of pressure or temperature. Around the plastic material is disposed quartz sand. All of the above are disposed within a cylindrical container. When gas exits from the expulsion fuse it is cooled by the copper wire. This causes the precipitation of water from the hot gas.

Abstract: An improvement in an exhaust device to absorb the energy of exhaust gases released during operation of a circuit interrupting device such as a power fuse or an expulsion fuse is disclosed. The exhaust control device includes a hollow housing coated with a corrosion resistant coating mounted to the circuit interrupting device by means of an adapter, composed of a corrosion resistant material such as brass, which is retained in a counterbore within the housing by rolling or folding over the extended upper rim of the housing so that the coating is not damaged. Alternatively, a steel header, welded to and plated along with the steel housing shell, within which the threaded brass adapter is installed, may also be used. The same rolling or folding operation may be used to secure a plated outlet end wall.