US2672540A - Banded multiple element fuse - Google Patents

Banded multiple element fuse Download PDF

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Publication number
US2672540A
US2672540A US343718A US34371853A US2672540A US 2672540 A US2672540 A US 2672540A US 343718 A US343718 A US 343718A US 34371853 A US34371853 A US 34371853A US 2672540 A US2672540 A US 2672540A
Authority
US
United States
Prior art keywords
current
fuse
elements
bands
fusible
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US343718A
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English (en)
Inventor
Clyde G Dewey
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.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to BE527419D priority Critical patent/BE527419A/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US343718A priority patent/US2672540A/en
Priority to FR1097339D priority patent/FR1097339A/fr
Application granted granted Critical
Publication of US2672540A publication Critical patent/US2672540A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05—Component parts thereof
    • H01H85/055—Fusible members
    • H01H85/12—Two or more separate fusible members in parallel

Definitions

  • the invention relates to fuse and more :particularly to power fuse units of the currentzlimiting type having a plurality of fusibleelements operating in parallel current interrupting .re-
  • Suchpower fuse units are extensivelyused in .lieu. of the relatively more-expensive andlarger sizecircuit breakers forprotecting relatively high voltage power circuits upon the occurrence of faults, particularly short circuits.
  • the multi-element current limiting type of fuse has the outstanding advantage over circuit breakers of initially limiting the excesscurrent to a value which .is only a fraction of that which the power circuitis .1
  • the multiple fuse elements ordinarily are in therform of relatively long fine Wires of areadilyvaporizable metalsuch as silver or zinc andv embedded in intimate heat. exchange relation throughout their activelength in an inert, granular refractory-arc extinguishing material of high dielectric strength, such as sand, or relatively finely dividedguartz.
  • the embedded .elements are enclosed. in an insulatin fuse casing or housing having terminals mounted thereon for connecting, the. fusible elements in -.parallel current .inrterrupting relation.
  • the principal object of the present invention is to provide an improved means :forincreasing the voltage: interrupting ability of amultiple element 2 current limiting fuse unit without increasing its size or length or -materially in- .cr.easing. its cost.
  • thefuse elements may be provided with sections of different crossflsec- 'tional area or with sections of different resistance characteristics such that sequential or stepby- .step fusing and dissipation of the fusible sections of each element is secured.
  • the interconnecting conducting members or bands of the present invention preferably are applied to interconnect the elements at the junctions of the sections and preferably with the section that will first fuse intermediate the bands so as more effectively to produce the joint fusing of the different sections of all elements in the desired sequence.
  • Fig. 1 is'a side view partly in section of a typical multiple element current limiting power fuse unit embodying the improvements of the present invention
  • Fig. 2 is a cross section view of the fuse unit shown in Fig. 1 on the sectional line 2-2 with the inert arc resistance material omitted;
  • Fig. 3 is a chart indicating the relative increase in voltage interrupting capacity of multiple element fuse units attained by means of the improvements of the present invention.
  • FIG. 1 A typical multiple element current limiting fuse unit construction is illustrated in Fig. 1
  • each core has four projecting ribs I8 so as to form an elongated square frame or reel upon which a plurality of fusible elements I 9 are wound in uniformlyspaced apart relationto'be separatelyembedded in the granular refractory material It, as shown three fusible elements I9 individual current limiting'and arc extinguishing "dependent upon the maximum continuous current carrying rating of the fuse.
  • the core construction and theWindingofthe fusible elements in spaced apart relation-thereon preferably is such that the elements are'uniformly distributed throughout the availablespace inside of the fuse casing Ill.
  • each fusible element will throughout its activelength be embedded in intimate heat conducting relation withthis material and sufficientlyisolated from the adjacentelements to obtain action of the parallel elements.
  • the three cores I5, I6, and II are mounted in symmetrically spaced apart relation inside casing I0 by means of a spacer plate 20 at each end and secured in position by the holding screws 2i.
  • the multiple fusible elements 19 on each core are interconnected in parallel currentinlterrupting' relation at the ends thereof by mean of a common terminal 22 which extends through suitable openings'inthe spacer plate 20 and is joined as by welding to one of the fuse terminals II or I2.
  • all of the elements I9 on all of the cores are connected between terminals I I and I2 in parallel current interrupting relation.
  • the current equalizing conducting members Or bands 24 and 25 are provided for interconnecting all of the fusible elements IE1 at spacedintervals intermediate their ends to increase the voltage interrupting ability of the fuse unit.
  • the three fusible elements I! wound on each core are interconnected in current equalizing relation by the bands 24 and 25 at equally spaced intervals intermediate their ends and the corresponding bands on each core are then interconnected by suitable jumpers 21 so as to electrically interconnect all of the elements on all of the cores.
  • the separate bands 24 and 25 on each core may be formed simply by winding andwelding a few turns of bare silver or zinc wire to interconnect all the. fusible elements thereon and twisting the ends of the wire together and leaving these ends sufficiently long for convenient joining as by welding with the ends of thecurrent equalizing bands on thead-w jacent cores.
  • the bands. and 25 are located adjacent to or overlying the junctions between the different sections of the fusible elements so as to thereby interconnect each of the corresponding sections of each of th elements in current equalizing relation.
  • a multiple element current limiting fuse unit provided with current equalizing bands constructed and arranged'asdescribed above will have an increased voltage interrupting ability over that provided by the same fuse unit without the bands.
  • Fig. 3 has been plotted from the results of these tests to indicate the substantial increase in successful interrupting ability that was obtained solely by applying the current equalizing bands in accordance with the present invention.
  • the length of a multiple element fuse unit normally required for successful interruption will increase as indicated by the dotted line A as the voltage of the circuit is increased.
  • the solid line B shows that when a pair of current equalizing bands are applied to the multiple element fuse unit, a substantial increase in successful voltage interrupting ability thereof is obtained without any increase whatever in over-all length of the unit.
  • a multiple element current limiting fuse unit having in combination, a casing formed of insulatin material having arc extinguishing material therein and having a pair of current conducting terminals mounted on the casing in spaced apart relation, a plurality of fusible elements in intimate heat exchange relation with the are extinguishing material and connected in parallel current interrupting relation between the terminals, and means including a conducting member interconnecting the elements intermediate the ends thereof for equalizing the distribution of the current between the elements to increase the voltage interrupting ability of the fuse unit,
  • a multiple element current limiting fuse unit having in combination, a casing formed of insulating material having arc extinguishing material therein and having ,a pair of current conducting terminals mounted on the casing in spaced apart relation, a plurality of fusible elements in intimate heat exchange relation with the arc extinguishing material and connected in parallel current interrupting relation between the terminals, and means including at least a pair of conducting members interconnecting the elements at substantially equally spaced intervals intermediate the ends thereof for equalizing the distribution of the current between the elements to increase the voltage interrupting ability of the fuse unit.
  • a multiple element fuse unit having a plurality of fusible elements connected in parallel current interrupting relation and each element having sections of diiferent fusing current capacity to produce sequential fusing thereof, and means including a conducting member interconnecting the junctions between the sections of the elements for equalizin the distribution of the current to increase the voltage interrupting ability of the fuse unit.

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  • Fuses (AREA)
US343718A 1953-03-20 1953-03-20 Banded multiple element fuse Expired - Lifetime US2672540A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE527419D BE527419A (enrdf_load_stackoverflow) 1953-03-20
US343718A US2672540A (en) 1953-03-20 1953-03-20 Banded multiple element fuse
FR1097339D FR1097339A (fr) 1953-03-20 1954-03-09 Perfectionnements aux fusibles électriques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US343718A US2672540A (en) 1953-03-20 1953-03-20 Banded multiple element fuse

Publications (1)

Publication Number Publication Date
US2672540A true US2672540A (en) 1954-03-16

Family

ID=23347331

Family Applications (1)

Application Number Title Priority Date Filing Date
US343718A Expired - Lifetime US2672540A (en) 1953-03-20 1953-03-20 Banded multiple element fuse

Country Status (3)

Country Link
US (1) US2672540A (enrdf_load_stackoverflow)
BE (1) BE527419A (enrdf_load_stackoverflow)
FR (1) FR1097339A (enrdf_load_stackoverflow)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2800554A (en) * 1953-06-23 1957-07-23 E M P Electric Ltd Electric fuses
US2957154A (en) * 1958-06-16 1960-10-18 Glo Quartz Electric Heater Co Resistance heating unit
US2972031A (en) * 1959-08-31 1961-02-14 Electric Transmission Ltd Electric fuses
US3145282A (en) * 1962-05-14 1964-08-18 Gen Electric Multiple element electric fuse
US4081853A (en) * 1976-03-23 1978-03-28 The Garrett Corporation Overcurrent protection system
US4369422A (en) * 1981-04-01 1983-01-18 Mcgraw-Edison Company Multiple element current limiting fuse
US4409729A (en) * 1980-10-07 1983-10-18 Littelfuse, Inc. Method of making spiral wound fuse bodies
US4445106A (en) * 1980-10-07 1984-04-24 Littelfuse, Inc. Spiral wound fuse bodies
US5736919A (en) * 1996-02-13 1998-04-07 Cooper Industries, Inc. Spiral wound fuse having resiliently deformable silicone core
US6538550B1 (en) * 1999-02-02 2003-03-25 Mcgraw-Edison Company High amperage current limiting fuse
US20060119464A1 (en) * 2004-12-06 2006-06-08 Muench Frank J Jr Current limiting fuse

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9500733D0 (en) * 1995-01-14 1995-03-08 Cooper Ind Inc Fuse assemblies

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2800554A (en) * 1953-06-23 1957-07-23 E M P Electric Ltd Electric fuses
US2957154A (en) * 1958-06-16 1960-10-18 Glo Quartz Electric Heater Co Resistance heating unit
US2972031A (en) * 1959-08-31 1961-02-14 Electric Transmission Ltd Electric fuses
US3145282A (en) * 1962-05-14 1964-08-18 Gen Electric Multiple element electric fuse
US4081853A (en) * 1976-03-23 1978-03-28 The Garrett Corporation Overcurrent protection system
US4409729A (en) * 1980-10-07 1983-10-18 Littelfuse, Inc. Method of making spiral wound fuse bodies
US4445106A (en) * 1980-10-07 1984-04-24 Littelfuse, Inc. Spiral wound fuse bodies
US4369422A (en) * 1981-04-01 1983-01-18 Mcgraw-Edison Company Multiple element current limiting fuse
US5736919A (en) * 1996-02-13 1998-04-07 Cooper Industries, Inc. Spiral wound fuse having resiliently deformable silicone core
US6538550B1 (en) * 1999-02-02 2003-03-25 Mcgraw-Edison Company High amperage current limiting fuse
US20060119464A1 (en) * 2004-12-06 2006-06-08 Muench Frank J Jr Current limiting fuse
US7477129B2 (en) * 2004-12-06 2009-01-13 Cooper Technologies Company Current limiting fuse
US7834738B2 (en) 2004-12-06 2010-11-16 Cooper Technologies Company Current limiting fuse
US8035473B2 (en) 2004-12-06 2011-10-11 Cooper Technologies Company Current limiting fuse

Also Published As

Publication number Publication date
BE527419A (enrdf_load_stackoverflow)
FR1097339A (fr) 1955-07-04

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