US2330690A - Cartridge fuse and switchgear incorporating the fuse - Google Patents

Cartridge fuse and switchgear incorporating the fuse Download PDF

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Publication number
US2330690A
US2330690A US375997A US37599741A US2330690A US 2330690 A US2330690 A US 2330690A US 375997 A US375997 A US 375997A US 37599741 A US37599741 A US 37599741A US 2330690 A US2330690 A US 2330690A
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United States
Prior art keywords
sheath
hammer
fuse
fusible element
trip
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Expired - Lifetime
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US375997A
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English (en)
Inventor
Dannenberg Kurt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ELECTRIC TRANSMISSION Ltd
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ELECTRIC TRANSMISSION Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/10—Adaptation for built-in fuses
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/30—Means for indicating condition of fuse structurally associated with the fuse
    • H01H85/303—Movable indicating elements
    • H01H85/306—Movable indicating elements acting on an auxiliary switch or contact
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/122—Automatic release mechanisms with or without manual release actuated by blowing of a fuse

Definitions

  • This invention has reference to improvements in and relating to cartridge fuses, i. e., fuses in the form of hermetically closed, powder filled sheaths containing fusible elements, for high, low and medium voltages.
  • a trip hammer which is arranged to be displaced with sufficient force to cause it mechanically to open an electric switch is held against return movement by a locking device arranged to engage with it after it has been so displaced.
  • the hammer has a part which is permanently exposed (i. e., exposed even when the fuse is not blown and is in service condition) to permit of easy access to the hammer.
  • Another feature of the invention comprises switchgear having a three-phase switch and fuses in accordance with the foregoing in series with the phases of the switch with their hammers, which act as strikers, commonly associated with the opening member of the switch so that operation of any fuse opens all switch phases and prevents closing of the switch until such time as an intact fuse i. e., a fuse fit for service) replaces the operated fuse in the switchgear.
  • Fig. 1 is a side elevation of a medium voltage fuse with that end thereof having the trip hammer shown in section;
  • Fig. 2 is a view of the trip hammer end of the fuse after removal of the connecting tag at this end;
  • Fig. 3 is a face view of a notched ring for supporting a number of fusible elements
  • Fig. 4 is an end view of a connecting tag on which a spring-driven locking bit is mounted.
  • Fig. 5 is a diagrammatically shown switchgear comprising a three-phase switch and three fuses with permanently accessible trip hammers.
  • the fuse illustrated in Figs. 1 and 2 comprises the usual refractory, insulating sheath l with internally flanged caps 2 secured to it at its ends. Screw-threaded sockets 3 are sunk into the ends of the sheath to take fixing screws 4 which secure the connecting tags 5 and 5, discs 6 and 6 and intermediate rings 1, 1 and 8, B to the sheath.
  • the elements 6, I and 8, and 6, 1'. 8, are of metal and each set thereof is firmly clamped between its adjacent connecting tag and end of the sheath by the screws 4.
  • the ring 8 has an inwardly directed tongue 9 to which a cylinder III for the trip hammer I l is welded near the inner end of the tongue, the cylinder l0 extending inwardly of the sheath l.
  • the disc 6 has a diamond-shaped slot l2, the centre of which coincides with the axis of the trip hammer II; and the ring I has an inwardly directed tongue l3 which lies against one side of the slot.
  • the corresponding connecting tag 5 lies against the other side of the said slot. In this manner a shallow chamber is provided.
  • the outer end of the trip hammer extends through holes l4 and IS in the tongues 9 and I3. respectively, through the middle portion of the said chamber and through a hole IS in the tag 5.
  • the cylinder in extends well beyond the inner end of the hammer II to provide a chamber I8 for explosive powder (e. g. gunpowder) IS.
  • explosive powder e. g. gunpowder
  • the hammer is annularly grooved at 20 near its inner end and one end of the fusible element 2
  • the outer end of the hammer has a screwthreaded shank 23 enablingit to be connected to or associated with a switch; and that portion of the hammer H normally within the hole I6 is squared and the said hole is of corresponding shape to prevent rotation of the hammer when a connecting body is applied to the shank.
  • is of coil form to enable the requisite length of wire to be arranged in the sheath having the length shown, in spite of the cylinder l0 projecting well into the sheath.
  • the coil and the cylinder are substantially aligned.
  • is located within the sheath; its ends are connected to the rings 8 and it is stretched between the inner peripheries of two ceramic rings or supports 25 let into recesses at the ends of the sheath.
  • the fuse is filled with powder indicated by 26 and the sealing provided by the members screwed to the ends of the sheath is such as to be hermetic or nearly so.
  • which is the main interruption element, preferably consists of tungsten and is so graded with respect to the explosive charge that approximately sec. time is required for the hammer to complete its ejection stroke.
  • the said element dissipates inside the fuse before the hammer fully operates.
  • rings 25 When it is desired to provide a fuse of high current rating the rings 25 are replaced by rings as 21 illustrated in Fig. 3.
  • the rings 21 have arcuate slots 28 around the bore 29 and the inner peripheral portions of the slots and of the bore are recessed at 30. Elements additional to the coil 2
  • the switchgear illustrated in Fig. 5 comprises the three-phase switch 33 and three fuses 34 having permanently accessible hammers. Each fuse is in series with a phase of the switch and the hammers have insulated ends 35 adjacent to arms 36 rigid with the operating rod 31 of the trip 38 cf the switch. Thus, operation of any one fuse causes its hammer partially to turn the shaft 31 and this upsets the trip to cause all phases of the switch to be opened. When the switch is so opened the trip is held in the upset position owing to the locking of the operated hammer and' cannot be reset until such time as an intact fuse is substituted for the one that has operated.
  • the switch 33 and its trip may be of any suitable known kind. Alternatively, the switch may be of the type which is directly opened by the turning of a shaft.
  • the hammer has a screw-threaded bore 39 into which a metal shank 40 on the insulating end 35 fits.
  • a cartridge fuse comprising a refractory, insulating sheath, a fusible element in said sheath, an arc-extinguishing powder filling in said sheath, hermetic closures at the ends of the sheath, a trip hammer mounted on said fuse, means activated by the fusing of the fusible element adapted to displace the trip hammer with a force sufficient to cause it mechanically to open an electric switch, and a locking device adapted to hold said hammer against return movement after it has been so displaced.
  • a cartridge fuse comprising a refractory, insulating sheath, a fusible element in said sheath, an arc-extinguishing powder filling in said sheath, hermetic closures at the ends of the sheath, a trip hammer mounted on said fuse, said hammer having a part which is permanently exposed topermit of easy access to it even when the fuse is not blown and is in service condition, means activated by the fusing of the fusible element adapted to displace the trip hammer with a force sufiicient to cause it mechanically to open an electric switch, and a looking device adapted to hold said hammer against return movement a ter it has been o di m 3.
  • a cartridge fuse comprising a refractory, insulating sheath, a fusible element in said sheath, an arc-extinguishing powder filling in said sheath, hermetic closures at .the ends of the sheath, a trip hammer mounted on said fuse, a shank extending from said hammer, said shank being exposed to permit of easy access to it even when the fuse is not blown and is ,in service condition, means activated by the fusing of the fusible element adapted to displace the trip hammer with a force sufficient to cause it mechanically to open an electric switch, and a locking device adapted to hold said hammer against return movement after it has been so displaced.
  • a cartridge fuse comprising a refractory, insulating sheath, a fusible element in said sheath, an arc-extinguishing powder filling in said sheath, hermetic closures at the ends of the sheath, a trip hammer mounted on said fuse, said hammer having a screw-threaded bore which is permanently exposed to permit of easy access to it even when the fuse is not blown and is in service condition, means activated by the fusing of the fusible element adapted to displace the trip hammer with a force sufiicient to cause it mechanically to open an electric switch, and a locking device adapted to hold said hammer against return movement after it has been so displaced.
  • a cartridge fuse comprising a refractory, insulating sheath, a fusible element in said sheath, an arc-extinguishing powder filling in said sheath, hermetic closures at the ends of the sheath, a trip hammer mounted on said fuse, said hammer having a groove, means activated by the fusing of the fusible element adapted to displace the trip hammer with a force sufficient to cause it mechanically to open an electric switch, and a spring locking device adapted to engage with said groove to hold the hammer against return movement after it has been so displaced.
  • a cartridge fuse comprising a refractory, insulating sheath, a fusible element in said sheath, an arc-extinguishing powder filling in said sheath, hermetic closures at the ends of the sheath, a trip hammer mounted on said fuse, said hammer having a groove, means activated by the fusing of the fusible element adapted to displace the trip hammer with a force sufilcient to cause it mechanically to open an electric switch, a flat body at one end of said sheath, a second fiat body lying against said first body and a third fiat body lying against said second body, the second body having a slot and the first and third bodies having openings of smaller size than the slot whereby a chamber is provided, and a spring locking device in said chamber, the trip hammer extending through said openings and said chamber and said spring device being arranged to engage with the groove in the trip hammer to hold said hammer against return movement after it has been displaced subsequently to
  • a cartridge fuse comprising a refractory, insulating sheath, a fusible element in said sheath, an arc-extinguishing powder filling in said sheath, hermetic closures at the ends of the sheath, a trip hammer mounted on saidfuse, said hammer having a groove, means activated by the fusing of the fusible element adapted to displace the trip hammer with a force sufficient to cause it mechanically to open an electric switch, connecting tags at the ends of the fuse and a spring locking device mounted on one of said tags arranged to engage with the groove in the trip hammer to hold said hammer against return movement after it has been displaced subsequently to fusing of the fusible element.
  • a cartridge fuse comprising a refractory, insulating sheath, a fusible element in said sheath, an arc-extinguishing powder filling in said sheath, hermetic closures at the ends of the sheath, a trip hammer mounted on said fuse, said hammer and said fusible element being in series electrically, means activated by the fusing of the fusible element adapted to displace the trip hammer with a force sumcient to cause it mechanically to open an electric switch, and a locking device adapted to hold said hammer against return movement after it has been so displaced.
  • a cartridge fuse comprising a refractory, insulating sheath, an helically coiled fusible element in said sheath, an arc-extinguishing powder filling in said sheath, hermetic closures at the ends of the sheath, a cylinder located at one of said ends coaxially of the coiled fusible element, said cylinder extending into the sheath, a trip hammer located in said cylinder and connected in series electrically with said fusible element, means activated by the fusing of the fusible element adapted to displace the trip hammer with a force sufficient to cause it mechanically to open an electric switch, and a locking device adapted to hold said hammer against return movement after it has been so displaced.
  • a cartridge fuse comprising a refractory, insulating sheath, an helically coiled fusible element in said sheath, an arc-extinguishing powder filling in said sheath, hermetic closures at the ends of the sheath, a cylinder located at one of said ends coaxially of the coiled fusible'element, said cylinder extending into the sheath, an explosive powder in the cylinder traversed by the fusible element, and a trip hammer in the cylinder, ignition of the powder as a result of the element fusing effecting displacement of the trip hammer with a force suflicient to cause it mechanically to open an electric switch, and a locking device adapted to hold said hammer against return movement after it has been so displaced.
  • insulating rings near the ends of the cartridge, said rings having longitudinal openings in them at different distances from their centers, the openings in one ring corresponding with those in the other and said rings surrounding the axis of the coiled fusible element and being parallel with the ends of the cartridge, terminal rings adjacent to said insulating rings, said terminal rings surrounding the axis of the coiled fusible element, and main service elements, said main service elements being electrically parallel with each other and with said coiled fusible element and stretching from openings in one insulating ring to corresponding openings in the other ring and connected at their ends to said terminal rings whereby said main service elements are of different length owing to the position of the holes in the insulating rings with relation to the terminal rings and, therefore, said elements of different length dissipate in steps when the fuse efiects an electrical interruption.
  • insulating rings near the ends of the cartridge, said rings having longitudinal openings in them at different distances from their centers, the openings in one ring corresponding with those in the other and the sides of said openings havwith each other and with said coiled fusible element and stretching from openings in one insulating ring to corresponding openings in the other insulating ring and lying in said notches and connected at their ends to said terminal rings whereby said main service elements are of different length owing to the position of the holes in the insulating rings with relation to the terminal rings and, therefore, said elements of different length dissipate in steps when the fuse effects an electrical interruption.
  • a cartridge fuse comprising a refractory insulating sheath, a fusible element in said sheath, an arc-extinguishing powder filling in said sheath, hermetic closures at the ends of the sheath, a trip hammer mounted on said fuse, said hammer having a part which is permanently exposed to permit of easy access to it even when the fuse is not blown and is in service condition, and means activated by the fusing of the fusible element adapted to displace the trip hammer with a force sufficient to cause it mechanically to open an electric switch,
  • a cartridge .fuse comprising a refractory insulating sheath, a fusible element in said sheath, an arc-extinguishing powder filling in said sheath, hermetic closures at the ends of the sheath, a trip hammer mounted on said fuse, a shank extending from said hammer, said shank being exposed to permit of easy access to it even when the fuse is not blown and is in service condition, and means activated by the fusing of the fusible element adapted to displace the trip hammer with a force sufficient to cause it mechanically to open an electric switch.
  • a cartridge fuse comprising a refractory insulating sheath, a fusible element in said sheath, an arc-extinguishing powder filling in said sheath, hermetic closures at the ends of the sheath, a trip hammer mounted on said fuse, said hammer having a screw threaded bore which is permanently exposed to permit of easy access to it even when the fuse is not; blown and is in service condition, and means activated by the fusing of the fusible element adapted to displace the trip hammer with a force sufficient to cause it mechanically to open an electric switch.
  • a cartridge fuse comprising a refractory insulating sheath, a fusible element in said sheath, an arc-extinguishing powder filling in said sheath, hermetic closures at the ends of the sheath, a trip hammer mounted on said fuse, said hammer and said fusible element being in series electrically, and means activated by the fusing of the fusible element adapted to displace the trip hammer with a force sufficient to cause it mechanically to open an electric switch.
  • a cartridge fuse comprising a refractory insulating sheath, an helically coiled fusible element in said sheath, an arc-extinguishing powder filling in said sheath, hermetic closures at the ends of the sheath, a cylinder located at one of said ends coaxially of the coiled fusible element, said cylinder extending into the sheath, a trip hammer located in said cylinder and connected in series electrically with said fusible element, and means activated by the fusing of the fusible element adapted to displace the trip hammer with a force suflicient to cause it mechanically to open an electric switch.
  • a cartridge fuse comprising a refractory insulating sheath, an helically coiled fusible element in said sheath, an arc-extinguishing powder filling in said sheath, hermetic closures at the ends of the sheath, a cylinder located at one of I said ends coaxially of the coiled fusible element, said cylinder extending into the sheath, an explosive powder in the cylinder traversed by the fusible element, and a trip hammer in the cylinder, ignition of the powder as a result of the element fusing elfecting displacement of the trip hammer with a force sufiicient to cause it me chanically to open an electric switch.
  • the trip hammer is provided with a per said main service elements being electrically parallel with each other and with said coiled fusible element and stretching from openings in one insulating ring to corresponding openings in the other ring and connected at their ends to said terminal rings, whereby said main service elements are of different length owing to the position of the holes in the insulating rings with relation to the terminal rings, and therefor e said elements of different length dissipate in steps when the fuse effects an electrical interruption.
  • a cartridge fuse wherein the trip hammer is provided with a permanently accessible part, and wherein there is provided insulating rings near the ends of the cartridge, said rings having longitudinal openings in them at different distances from their centers, the openings in one ring corresponding with those in the other and the sides of said openings having notches in them and said rings surrounding the axis of the coiled fusible element and being parallel with the ends of the cartridge, terminal rings adjacent to said insulating rings, said terminal rings surrounding the axis of the coiled fusible element, and main service elements, said main service elements being electrically parallel with each other and with said coiled fusible element and stretching from openings in one insulating ring to corresponding openings in the other insulating ring and lying in said notches and connected at their ends to said terminal rings, whereby said main service elements are of different length owing to the position of the holes in the insulating rings with relation to the terminal rings, and therefore said elements of different length dissipate in steps when the fuse
  • a cartridge fuse comprising a refractory insulating sheath, a main service fusible element in said sheath and a main interruption element in said sheath, an arc-extinguishing powder filling in said sheath, said main service and main interruption elements being embedded in said powder filling, an explosive container in said sheath, an explosive in said container, said main interruption element entering said container to make igniting relationship with said explosive 5 upon cut-out operation of the fuse, and a trip hammer mounted on said fuse, said trip hammer being located between said explosive and atmosphere and said explosive being present in sufficient quantity to ensure that when the main interruption element ignites it the trip hammer is displaced with a force sufficient to enable it mechanically to open an electric switch, and a locking device to hold said hammer against return movement after it has been displaced by the explosive charge.
  • a cartridge fuse comprising a refractory insulating sheath, a fusible element in said sheath, an arc-extinguishing powder filling in said sheath, hermetic closures at the ends of the sheath, a trip hammer mounted on said fuse, said hammer having a part which is permanently exposed to permit of easy access to it even when the fuse is not blown and is in service condition and said hammer and said fusible element being in series electrically and being mechanically continuous with each other, means adapted to 30 hold said trip hammer against rotation with respect to said cartridge fuse, and means activated by the fusing of the fusible element adapted to displace the trip hammer forcibly.
  • a cartridge fuse comprising a refractory 35 insulating sheath, a fusible element in said sheath, an arc-extinguishing powder filling in said sheath, hermetic closures at the ends of the sheath, a trip hammer mounted on said fuse, said hammer having a part which is permanently exposed to permit of easy access to it even when the fuse is not blown and is in service condition and said hammer and said fusible element being'in series electrically and being mechanically continuous with each other, means adapted to hold said trip hammer against rotation with respect to said cartridge fuse, means activated by the fusing of the fusible element adapted to displace the trip hammer forcibly, and alocking device adapted to hold said hammer against return movement after it has been so displaced.
  • a cartridge fuse comprising a refractory insulating sheath, an helically coiled fusible element in said sheath, an arc-extinguishing powder filling in said sheath, hermetic closures at the ends of the sheath, a cylinder located at one of said ends coaxially of the coiled fusible element, said cylinder extending into the sheath, an explosive powder in the cylinder traversed by the fusible element, a trip hammer in the cylinder, said trip hammer having a part which is permanently exposed to permit of easy access to it even when the fuse is not blown and is in service condition and said fusible element and said trip hammer being in series electrically and being mechanically continuous, ignition of the powder as a result of the element fusing effecting forcible displacement of the trip hammer, and means preventing rotation of said trip hammer with respect to said fusible element.

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US375997A 1940-05-31 1941-01-25 Cartridge fuse and switchgear incorporating the fuse Expired - Lifetime US2330690A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9528/40A GB541562A (en) 1940-05-31 1940-05-31 Improvements in and relating to low tension cartridge fuses and to electrical circuits incorporating said fuses

Publications (1)

Publication Number Publication Date
US2330690A true US2330690A (en) 1943-09-28

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Application Number Title Priority Date Filing Date
US375997A Expired - Lifetime US2330690A (en) 1940-05-31 1941-01-25 Cartridge fuse and switchgear incorporating the fuse

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US (1) US2330690A (enrdf_load_stackoverflow)
BE (1) BE463764A (enrdf_load_stackoverflow)
FR (1) FR917615A (enrdf_load_stackoverflow)
GB (1) GB541562A (enrdf_load_stackoverflow)
NL (1) NL66668C (enrdf_load_stackoverflow)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2473196A (en) * 1942-11-13 1949-06-14 Dannenberg Kurt Combined thermal-magnetic circuit breaker
US2525527A (en) * 1944-06-22 1950-10-10 Dannenberg Kurt Ring main distribution protection system
US2577465A (en) * 1949-10-07 1951-12-04 Engineered Products Inc Sandblast gun
US2712575A (en) * 1948-02-27 1955-07-05 Kenneth M Kiel Squib switch
US2824929A (en) * 1954-11-12 1958-02-25 Ite Circuit Breaker Ltd Mechanical trip means for circuit breaker current limiting device combination
US2834852A (en) * 1956-06-21 1958-05-13 Kenneth W Swain Plug-in type power fuses
US2843702A (en) * 1952-10-22 1958-07-15 Ite Circuit Breaker Ltd Protective device with current limiting means
US2888535A (en) * 1954-12-03 1959-05-26 Ite Circuit Breaker Ltd Removable and replaceable current limiter housing for circuit breakers
US2922007A (en) * 1956-11-23 1960-01-19 Ite Circuit Breaker Ltd Spring mounting of current limiting devices within a housing
US2924688A (en) * 1956-11-14 1960-02-09 Ite Circuit Breaker Ltd End mounting of a current limiting device associated with a circuit breaker
US2924689A (en) * 1956-11-23 1960-02-09 Ite Circuit Breaker Ltd Interlock defeater for trip unit
US2924686A (en) * 1955-12-23 1960-02-09 Ite Circuit Breaker Ltd Fusible switch comprising a circuit breaker and current limiting fuse
US2928997A (en) * 1955-05-10 1960-03-15 Ite Circuit Breaker Ltd Coordinated circuit breaker and current limiting device
US2949516A (en) * 1956-11-23 1960-08-16 Ite Circuit Breaker Ltd Reposition terminals for circuit breaker base extension
US3009036A (en) * 1956-08-24 1961-11-14 Westinghouse Electric Corp Circuit interrupter
US3009035A (en) * 1956-08-17 1961-11-14 Westinghouse Electric Corp Circuit interrupters
US3009038A (en) * 1956-12-24 1961-11-14 Westinghouse Electric Corp Circuit interrupter
US3032631A (en) * 1954-10-11 1962-05-01 Ite Circuit Breaker Ltd Circuit breaker having electrical and mechanical coordination with a current limiting device
US3077525A (en) * 1954-09-20 1963-02-12 Westinghouse Electric Corp Circuit interrupter
FR2759212A1 (fr) * 1997-02-06 1998-08-07 Abb Transmit Oy Coupe-circuit destine a deconnecter un appareil electrique d'un reseau electrique

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2473196A (en) * 1942-11-13 1949-06-14 Dannenberg Kurt Combined thermal-magnetic circuit breaker
US2525527A (en) * 1944-06-22 1950-10-10 Dannenberg Kurt Ring main distribution protection system
US2712575A (en) * 1948-02-27 1955-07-05 Kenneth M Kiel Squib switch
US2577465A (en) * 1949-10-07 1951-12-04 Engineered Products Inc Sandblast gun
US2843702A (en) * 1952-10-22 1958-07-15 Ite Circuit Breaker Ltd Protective device with current limiting means
US3077525A (en) * 1954-09-20 1963-02-12 Westinghouse Electric Corp Circuit interrupter
US3032631A (en) * 1954-10-11 1962-05-01 Ite Circuit Breaker Ltd Circuit breaker having electrical and mechanical coordination with a current limiting device
US2824929A (en) * 1954-11-12 1958-02-25 Ite Circuit Breaker Ltd Mechanical trip means for circuit breaker current limiting device combination
US2888535A (en) * 1954-12-03 1959-05-26 Ite Circuit Breaker Ltd Removable and replaceable current limiter housing for circuit breakers
US2928997A (en) * 1955-05-10 1960-03-15 Ite Circuit Breaker Ltd Coordinated circuit breaker and current limiting device
US2924686A (en) * 1955-12-23 1960-02-09 Ite Circuit Breaker Ltd Fusible switch comprising a circuit breaker and current limiting fuse
US2834852A (en) * 1956-06-21 1958-05-13 Kenneth W Swain Plug-in type power fuses
US3009035A (en) * 1956-08-17 1961-11-14 Westinghouse Electric Corp Circuit interrupters
US3009036A (en) * 1956-08-24 1961-11-14 Westinghouse Electric Corp Circuit interrupter
US2924688A (en) * 1956-11-14 1960-02-09 Ite Circuit Breaker Ltd End mounting of a current limiting device associated with a circuit breaker
US2949516A (en) * 1956-11-23 1960-08-16 Ite Circuit Breaker Ltd Reposition terminals for circuit breaker base extension
US2924689A (en) * 1956-11-23 1960-02-09 Ite Circuit Breaker Ltd Interlock defeater for trip unit
US2922007A (en) * 1956-11-23 1960-01-19 Ite Circuit Breaker Ltd Spring mounting of current limiting devices within a housing
US3009038A (en) * 1956-12-24 1961-11-14 Westinghouse Electric Corp Circuit interrupter
FR2759212A1 (fr) * 1997-02-06 1998-08-07 Abb Transmit Oy Coupe-circuit destine a deconnecter un appareil electrique d'un reseau electrique
BE1012970A5 (fr) * 1997-02-06 2001-07-03 Abb Transmit Oy Coupe-circuit pour debrancher un appareil electrique du reseau electrique.
US6479780B2 (en) 1997-02-06 2002-11-12 Abb Oy Circuit breaker for disconnecting an electrical apparatus from electrical network

Also Published As

Publication number Publication date
GB541562A (en) 1941-12-02
BE463764A (enrdf_load_stackoverflow)
FR917615A (fr) 1947-01-16
NL66668C (enrdf_load_stackoverflow)

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