Abstract: Overcurrent protection fuses with end cap assemblies amenable to automated manufacturing techniques and providing arc burn through resistance when the fusible element opens therein. The end cap assemblies may include washers having arc resistant compositions and may include single or double end cap constructions. Fuse rejection features may be formed in one of the end caps and may create an empty space in the end cap when assembled to a fuse body.

Abstract: A pyromechanical battery pole disconnect element, includes a housing (1) in which an electrical conductor is located, a pyrotechnic active element (14) including a breaking piston with a disconnect element (7) to sever the electrical conductor at an isolating point (11), and a pyrotechnic charge to drive the disconnect element (7). All of the current-conducting components except the active element (14) are combined to form a one-piece battery terminal clamp element (5).

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: 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: This high-voltage fuse comprises a tubular housing and a fuse subassembly within the housing with a core in the form of an elongated, cylindrical body primarily of silica sand particles bound together in a rigid, porous mass, a fusible element wound about the core, and connector assemblies at opposite ends of the core electrically connected to opposite ends of the fusible element. The fuse subassembly is closely surrounded by silica sand in the space between the housing and the subassembly.

Abstract: An arc quenching, current limiting fuse utilizing a fuse link having a plurally of bends which cause the fuse link to come in contact or come in close proximity to the inside wall of the fuse body. When a short circuit and electrical arc occurs, the fuse link material burns toward the fuse wall creating an interaction with the fuse wall and an increase in pressure which extinguishes the arc.

Abstract: Disclosed is an electronic part having a safeguard function for protecting the associated electronic equipment against abnormally high voltages such as lightning surge voltage. It is equipped with an element which cuts off any continuous excess current so as to prevent the surge absorbing element and the protected circuit from being spontaneously ignited. This electronic part having a safeguard function comprises: a surge absorbing element (1); a low-melting-point metal element (23) which is electrically connected in series with said surge absorbing element (1) and which is held in contact with said surge absorbing element (1) in such a manner as to allow a satisfactory heat conduction therebetween; and a thermocontractive insulating tube (25) which covers over the periphery of said surge absorbing element (1) and the periphery of said low-melting-point metal element (23).

Abstract: The high current interrupting fuse of the invention includes an envelope free of sand or similar arc quenching material. The envelope preferably has terminal end caps enclosing the ends of the envelope between which caps a fuse element extends. The envelope has an arc-quenching gas-releasing material at least at the inner surface of the envelope. Arc barrier plugs made of an ablative material surround each end of the fuse element which for ease of assembly freely pass through bores of plugs. The fuse element also preferably passes through metal plates externally of the plugs and adjacent to the end caps.

Abstract: A fuse (12) comprising a tube of insulating material having an inner (16) and an outer wall surface (18) and forming a fuse housing (14). The fuse includes a pair of conductive fuse terminals (24, 26) secured at opposite axial ends (20, 22) of the tube. A fuse element (23) is axially disposed within and extends between the ends of the fuse housing, and its ends are electrically and physically directly connected with the adjacent fuse terminal. A plug of initially solid, arc-quenching material (32) at preferably only at one end of the fuse housing occupies only a limited axial extent thereat and evaporates under fuse blowing conditions to fill the housing with an arc-quenching vapor.

Abstract: An electric cartridge fuse having a channel shaped fusible link section which carries a gas evolving core is provided with means for assuring positive axial positioning of the core without requiring deformation of the fuse link. The gas evolving core is provided with a lateral protrusion which extends through and operatively engages one of the perforations in the fuse link thereby positively axially positioning the core with respect to the fuse link.

Abstract: An expulsion type fuse cutout fuseholder structural assembly (10) including a fuse tube assembly (12) having a bone fiber liner (40) and a sleeve insert (36) coaxially disposed entirely interiorly within an insulative outer covering or wrapping (14). A rabbet joint is defined between the mated ends of the liner (40) and sleeve insert (36) by means of a counterbored portion (48) of the liner (40) and an axially projecting tubular portion (44) of the sleeve insert (36). In addition, each of the bone fiber liner (40) and sleeve insert (36) components is provided with a spiral groove (42,38) within which the inner layers of the outer covering or wrapping (14) are disposed during the wrapping fabrication of the fuse tube assembly (12).

Abstract: There is provided by this invention a current limiting fuse having a fuse element wound about support means consisting of a non-stoichiometric oxide core that produces an electro-negative gas when heated by the melting fuse element. The generation of the electro-negative gas results in more rapid and efficient arc extinction.

Abstract: A miniature fuse has a housing consisting of a plastics base (1), a plastics cap (2), and two conductors which pass through the base and are bridged across inside the cap by a fusible conductor (3). The interior of the fuse housing is fully or partially lined with a ceramic-based lining (5) to protect the plastics against thermal decomposition and to promote condensation of the fusible conductor which may be evaporated, upon blowing of the fuse, to reduce internal pressure in the housing and hence avoid separation of the cap from the base and exposure of conductive parts.

Abstract: This current-limiting fuse comprises a fusible element having a predetermined location at which an arc will be initiated when prolonged overcurrents of relatively low value have persisted for a predetermined duration. For increasing the arc voltage developed by said arc, an electrical insulating member is disposed about the fusible element in a position where at least a portion of the arc will burn within the insulating member and cause vapors to be evolved from the material of the insulating member. The insulating member is of a material that evolves substantially no vapors or gases at the temperatures reached by the insulating material prior to arc-initiation during prolonged overcurrents of up to one hour in duration. This material is a baked material, a major portion of which is hydrated aluminum silicate including water of hydration that is released only at temperatures in excess of those attained by the insulating material during prolonged overcurrents as long as one hour.

Abstract: A high voltage fuse having mounted gas evolving members and method of forming such a fuse are disclosed. The high voltage fuse comprises, in part, a plurality of block shaped gas evolving members attached to a plurality of fuse elements, which, in turn, are wound about a supporting core. The high voltage fuse also has an electrically insulating casing in which is mounted the core having the wound fuse elements and the attached blocks of gas evolving members. The fuse casing is filled with a pulverulent arc quenching filler material. The block shaped gas evolving members have a narrow slit which allows the gas evolving members to be easily slipped over the fuse element so as to cover part or all of a transverse portion of the fuse. The gas evolving members are positioned over the fuse element at locations along the core so that the block type gas evolving members are arranged between adjacent portions of the ribs of the core.

Abstract: An electric fuse, in particular an electric time-lag fuse, comprising a tubular casing, a pair of terminal elements, a granular arc-quenching filler, and a pair of parallel fusible elements inside the casing interconnecting the pair of terminal elements. Each of the pair of fusible elements has a plurality of juxtaposed points of reduced cross-section. Juxtaposed points of reduced cross-section support an M-effect causing overlay thereon. Each of the M-effect causing overlays extends from a pair of juxtaposed points of reduced cross-section in opposite directions longitudinally of said pair of fusible elements. A substantially E-shaped member of a solid gas-evolving material having three arms is associated with said pair of fusible elements. One of said three arms is interposed between said pair of fusible elements at the region thereof where the juxtaposed points of reduced cross-section are located.

Abstract: The process of circuit interruption by an electric fuse can be initiated either by a protracted overload, or by a major fault current of large proportions. This invention is concerned with the latter kind of fault currents.A substantially U-shaped gas-evolving structure is inserted between parallel rows of fusible elements. The two parallel arms of that structure are positioned close to the terminal elements of the fuse. A tie member interconnecting the two arms is positioned substantially out of the arcing zone and parallel to a generatrix of the fuse casing. On occurrence of a major fault current, the gas evolved from the arms protects the terminal elements of the fuse. It also tends to quench the follow current, i.e. the current which flows through the hot fulgurite after a successful interruption of a major fault current.

Abstract: A non gas evolving insulating support of generally star shaped X-sect for supporting the turns of a helically wound fusible element is provided with gas evolving means affixed thereto in proximity with but spaced from the fusible element.

Abstract: An improved circuit interrupting device includes a pair of contacts which are relatively movable and between which an arc is established. Following melting of a fusible element, a stored energy source relatively moves the contacts apart to elongate the arc, and a container of pressurized dielectric fluid simultaneously directs fluid from a port at the arc. The fluid and the arc elongation ultimately extinguish the arc. A fusible diaphragm normally closes the port to prevent the escape of fluid, and also, due to its mechanical attachment to the contacts, restrains relative movement therebetween. The fusible element is so connected as to normally shunt current through the device away from the diaphragm. When the fusible element melts, all of the current through the device flows through and melts the diaphragm. As the diaphragm melts, two results are effected: fluid is permitted to escape from the port, and relative movement between the contacts occurs.

Abstract: An electric fuse has rod supports for the helically wound fusible element which are of a laminate of glass cloth and a synthetic resin. This is a material which is slightly gas evolving. The rods have inserts of a material which is highly gas evolving, and they provide a substantial spacing between the path of the fusible element--and the arc path--and the surface of the rod supports for it. The limited gas evolving capacity of the rods combined with the large gas evolving capacity of the inserts and combined with the spacing between the arc path and the surface of the rods allows proper operation of the fuse in the absence of any ceramic insulators or ceramic supports for the fusible element.

Abstract: A pair of parallel fusible elements is sub-divided, or separated by points of reduced cross-section into two parallel strings of fusible element sections. The pair of fusible elements is supported by a support of electric insulating material including a portion arranged between the pair of fusible elements and extending in a direction longitudinally thereof. The support further includes transverse arms arranged to both sides of the portion of the support that extends in the direction of the pair of fusible elements. These transverse arms are planar and support said planar fusible element sections and consequently the pair of fusible elements. The arms sandwich the planar fusible element sections which are arranged between the arms. If fusible elements of the above kind are connected in parallel into an electric circuit, the fusible elements will fuse sequentially at low currents at one or more points thereof. This process is often referred-to as "triggering".

Abstract: An electric fuse having a printed circuit type fusible element. A substrate of glass textile material impregnated with a polymerized melamine resin and alumina trihydrate is the carrier for the fusible element. The dispersion of the two above referred-to components is formulated to serve as adhesive medium between the glass textile material and its metal covering and as source of arc-quenching gases when subjected to the action of an electric arc. An addition of silane significantly enhances the bonding action of the melamine resin alumina trihydrate dispersion of the glass fiber substrate with the metal layer by which it is clad.

Abstract: A current limiting fuse construction including a fuse element extending between electroconductive terminals carries a body of arc-quenching filler material within a hollow casing of electric insulating material. The filler material includes loose granular insulating material, such as sand, and larger particles of material uniformly distributed throughout the sand as a resin vaporizable in response to the heat of an arc current. According to a second embodiment a stratified filler comprises uniformly spaced layers alternately occurring between sand and a sand/resin mixture to increase arc voltage.

Abstract: An electric protective device capable of handling both short-circuit currents and minor overload currents of impermissible duration. The device for interrupting small overload currents of impermissible duration includes a cylinder, a plunger inside said cylinder, a spring biasing said plunger, heater means, a solder joint conductively connected to said heater means and said plunger, and a body of material evolving gases under the heat of an arc surrounding said solder joint, adjacent portions of said plunger and adjacent portions of said heater means.The process of manufacturing this device is preferably performed in two steps, namely arranging adjacent the solder joint of the device a sleeve-shaped body of melamine and an inorganic filler in a highly viscous putty-like form, and thereafter allowing said body to harden completely.

Abstract: A fuse for elevated circuit voltages is provided with an arrangement or array of gas-evolving beads intended to improve the performance of the fuse under major fault current conditions. The fusible element is wound around a space in the shape of a four-sided prism, each full turn including four quarter sections. The fusible element supports a plurality of beads of a gas-evolving material that are positioned on all four sides of said space and substantially equally distributed among the four sides thereof. Said beads are mounted periodically on said quarter sections of said fusible element in such a way that bead-bearing quarter sections of said fusible element alternate with equal numbers of non-bead-bearing quarter sections thereof.