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US2961593A - Coordination of current-limiting fuses and circuit interrupters for the protection of semi-conductor rectifiers - Google Patents

Coordination of current-limiting fuses and circuit interrupters for the protection of semi-conductor rectifiers Download PDF

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US2961593A
US2961593A US663950A US66395057A US2961593A US 2961593 A US2961593 A US 2961593A US 663950 A US663950 A US 663950A US 66395057 A US66395057 A US 66395057A US 2961593 A US2961593 A US 2961593A
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current
point
fuse
fuses
link
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US663950A
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English (en)
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Frederick J Kozacka
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Chase Shawmut Co
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Chase Shawmut Co
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Priority to US663950A priority patent/US2961593A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
    • H02H7/1257—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers responsive to short circuit or wrong polarity in output circuit
    • 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
    • H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
    • H01H85/044—General constructions or structure of low voltage fuses, i.e. below 1000 V, or of fuses where the applicable voltage is not specified
    • H01H85/0445—General constructions or structure of low voltage fuses, i.e. below 1000 V, or of fuses where the applicable voltage is not specified fast or slow type

Definitions

  • This invention refers to protection of semiconductor rectifiers by the coordinated action of current-limiting fuses and of automatic circuit interrupters having separable contacts.
  • the operating or fusing characteristic of a ribbon fuse link made of a high conductivity, low fusing energy metal, preferably silver, or possibly copper, and provided With a neck, or point of reduced cross-sectional area, depends entirely upon the particular geometry of the fuse link under consideration.
  • a ribbon fuse link which has the smallest neck dimensions compatible with dinitfid rates Patent 0 mensional stability requirements and whose normal width is dictated by given substantial current-carrying requirements has a fusing characteristic which is entirely determined by its geometry.
  • the operating or fusing characteristic of a ribbon fuse link which is entirely determined by the geometry of the ribbon is not entirely satisfactory.
  • a more specific object of the invention is to provide protective systems for semiconductor rectifiers comprising current-limiting fuses including ribbon links having a point of restricted cross-sectional area sufiiciently short and sufficiently narrow to approximate a point-heatsource when carrying an electric current, which protective systems have response characteristics other than the response characteristics determined by the aforementioned geometrical configuration of the fuse link, and which protective systems operate considerably faster both in the range of relatively high excess currents and in the range of relatively small excess currents than in accordance with the determination of the speed of response based on the geometrical configuration of the fuse link.
  • Still another object of the invention is to provide means for establishing reclosable breaks in the protected circuit if the overcurrent therein is relatively small, and to provide means for establishing non-reclosable breaks in the protected circuit if the excess current therein is relatively large.
  • Another object of the invention is to provide protective systems for semiconductor rectifiers, and more particularly rectifier bridges, comprising a relatively large number of rectifier cells, which systems are provided with selective means for clearing fault currents resulting from actual or impending cell failure and for clearing small overload currents resulting from external faults or overloads.
  • Still another object of the invention is to provide protective systems for semiconductor rectifiers wherein the rectifier cells are arranged in series with current-limiting cell fuses and wherein the cell fuses are adapted to generate re t velv hi h are voltages and to minimize the arcing fi -dt incident to interruption below values normally encountered with silver-sand fuses,
  • Fig. 1 is a section along l-l of Fig. 2. and shows a prior art current-limiting fuse
  • Fig. 2 is a section along 2-2 of Fig. 1;
  • Fig. 3 is a section along 3-3 of Fig. 4 and shows a current-limiting fuse applied for carrying the invention into effect;
  • Fig. 4 is a section along 4-4 of Fig. 3;
  • Fig. 5 is a circuit diagram of a rectifier system embodying the invention.
  • Fig. 6 is a time-current curve of the circuity shown in Fig. 5, both the abscissae and the ordinates being plotted on a logarithmic scale.
  • FIG. 1 has been applied to indicate a casing of insulating material which is closed on both ends by terminal elements 2 in the form of copper plugs.
  • Each plug 2 is provided with a connecting contact 3 in the form of a blade, and both plugs.2 are conductively interconnected by a ribbon fuse link 40f a high conductivity low fusing energy metal such as silver.
  • Fuse link .4 is embedded in a pulverulent arc-quenching filler 5, such as chemically pure quartz sand.
  • Two substantially V-shaped lateral incisions 6 in fuse link 4 define a point 7 of greatly reduced cross-sectional area.
  • link 4 is small, say in the order of .015", and the point of greatly reduced cross-sectional area or neck 7 is sufficiently short and sufficiently narrow to approximate a point-heat-source when link 4 is carrying an electric .current, It.is important that point 7 of link 4 be of silver; the adjacent axially outer portions of link 4 which have a relatively large cross-sectional area might be made of copper, if desired.
  • a multimetallic fuse link of. this character adapted for current-limiting fuses is disclosed in United States Patent 2,781,434 to Kenneth W. Swain, Current-Limiting. Fuses Comprising Fuse Links of Silver and Copper, February 12, 1957, and reference may be had to that patent for additional information on the above subject. A fuse as shown in Fig.
  • Fig. 1 lends itself relatively well to the protection of semiconductor rectifiers because its time current curve comes close to that desired for that particular application or, in other words, matches closely with the damage characteristic of very sensitive rectifier cells.
  • the fuse shown in Fig. 1 is, however, too slow in the range of overloads less than 3 times itscurrent rating.
  • the quartz filler 5 forms fulgurites when fused under the heat of an arc kindled in the fuse, which fulgurites shunt the arc gap when hot and forming good conductors of electricity.
  • Such arc-gap-shunting fulgurites are conducive to relatively high values of the arcing fi -dz and tend to give rise to small leakage currents flowing through the fuse upon interruption of the circuit by it.
  • a fuse of the type illus- 'trated in Fig. 1 is to be fully adapted for the protection of highly critical rectifier cells such as, for instance, silicon rectifier cells.
  • highly critical rectifier cells such as, for instance, silicon rectifier cells.
  • the difiiculties encountered by the formation of arc-gap-shunting fulgurites can be avoided by providing blast action are extinguishing means as will be shown below more in detail.
  • the speed desirable for semiconductor rectifier applications at current ratings above 3 to 5 times current rating can be achieved by relying on corrosion of the base metal of the fusible element by an overlay of a metal having a lower fusing point than the base metal.
  • the reduced cross-section portion 7 of link 4 is provided with a critically thin link-destroying low-fusing point metal overlay. What is meant by the words "critically thin will be described below in greater detail.
  • the link-destorying overlay may, for instance, be of tin, or an alloy of tin.
  • the overlay may
  • fuses of the type shown in Figs. 1 and 2 having fusible elements with a critically thin overlaycapable of corroding the base metal are adequate for semiconductor rectifier cell protection at currents in excess of three times current rating as far as speed requirements are concerned, such fuses are not adequate for semiconductor rectifier cell protection in other respects.
  • the are that forms upon fusion of the fusible element converts the surrounding quartz filler into a fulgurite which is a semiconductor when hot and unduly increases the arcing ff -dt of the fuse and the post current zero leakage current through the fuse.
  • the fuse is provided with blast action quenching means adapted to preclude formation of an arc-gap-shunting fulgurite upon fusion of the fusible link or fusible element and inception of an arc.
  • FIG. 10 numeral 10 has been applied to indicate an insulating casing closed on both ends by metal caps 11 which are crimped at the axially inner edges into casing 10 to effect a firm mechanical connection between casing 10 and caps 11.
  • Casing 10 houses a strip of laminated material, generally indicated by the reference numeral 12.
  • Strip 12 is resilient, and bent, and rests with the axially outer ends thereof against the insides of caps 11.
  • Strip 12 comprises an inner layer 13 of insulating material, and two outer layers 14 of metal, preferably copper. Materials of this nature are known as metal clad laminates.
  • the upper layer 14 of copper is subdivided by a transverse groove 19 into two separate sections.
  • Bores 15 project transversely across strip 12 and a fine silver wire 16 is threaded through bores 15 and soldered at points 17 to the upper layer 14 of copper and at points 18 to the lower layer 14 of copper.
  • the lower layer 14 of copper is subdivided by transverse grooves 19 into two axially outer sections and an axially inner section.
  • the solder joints 18 connect wire 16 to said axially inner section of the lower layer 14.
  • Solder joints 19 connect strip 12 to caps 11.
  • the above structure can be made to establish substantially the same thermal pattern as a fuse having a ribbon link with two'serially con nected necks or reduced cross-section portions of which each is' sufficiently narrow and sulficiently short to approximate a point-heat-source when the fuse is carrying current.
  • the portions of wire 16 which are threaded through bores 15 form point-heat-sources when the fuse is carrying current
  • the upper layer 14 and the lower layer 14 of copper form heat dissipating fins operating substantially in the same fashion as the portions of link 4 of Figs. 1 and 2 the cross-section of which is not reduced
  • Figs. 1 and 2 on the one hand, and of Figs. 3 and 4, on the other hand, are, or may be made to be, in substance thermal equivalents of each other inasmuch as both comprise a conductor of electricity which has a drastically short portion of drastically reduced cross-section forming, or approximating, a point-heat-source when the fuse is carrying current.
  • a closer approximation to a point-heat-source may be achieved by means of the'structure of Figs. 3 and 4 than by means of the structure of Figs. 1 and 2 since the diameter of wire 16 may be as small as desired, whereas in the structure of Figs. 1 and 2 mechanical strength or dimensional stability considerations limit the minimum cross-sectional area which may be given to neck 7.
  • FIG. 5 which illustrates a three phase full wave rectifier
  • numerals 20 have been applied to indicate the three secondary Y-connected windings of a transformer used as a source of alternating current.
  • This transformer is connected to a rectifier, and the automatic circuit interrupter or circuit breaker diagrammatically indicated at CB is interposed between the transformer and the rectifier.
  • the rectifier comprises six rectifier cells 31), of which each is connected in series with a current-limiting fuse 31 of the type shown in Figs. 3 and 4.
  • Reference numeral L has been applied to indicate the load in the D.-C. circuit of the rectifier.
  • the automatic circuit interrupter or circuit breaker CB comprises three movable contacts 24, gang operated by means of cross-bar 26, each cooperating with one of the three fixed contacts 25.
  • Tripping devices 22 are connected to each other by conductors or leads 2,1 in each of which a tripping device 22 is arranged.
  • Tripping devices 22 mav be of any desired nature as long as they comply with the requirements set forth below.
  • Reference character B in Fig, 6 indicates the tripping characteristic of an instantaneous electromagnetic tripping device 22.
  • Each tripping device 22 is adapted to control the transverse trip bar 23.
  • Trip bar 23 is, in turn, adapted to unlatch a latching mechanism 27, 28, latch 27 forming an integral part of crossbar 26. If one of the tripping devices 22 responds to an excess current, trip bar 23 is actuated, thereby unlatching latch 27, and thus permitting contacts 24 to move under the action of the bias of spring 29 to theopen pos ien thereof.
  • the link-destroying effect of certain low fusing point metals is generally used in the fuse art to establish time delays in the low overload range to preclude a fuse from blowing in response to harmless inrush currents of short duration as. for instance, inrush currents resulting from starting of electric motors.
  • the time delay effect of certain low fusing point metals is achieved by a relative increase of the mass of a link and a concomitant increase of its heat absorbing capacity combined with the derating effect resulting from the application of a linkdestroying low fusing point overlay. If the mass of a link is not increased and the link is provided with a criticallv thin overlay of a link-destroying low fusing point metal. a relative increase of speed of response may be achieved, i.e.
  • the fuse may be caused to blow at an earlier point of time.
  • This phenomenon may be explained as follows. If the neck of a ribbon link such as the neck 7 of the ribbon link shown in Fig. l fuses on relatively high excess currents, i.e. currents which are so high as to cause fusion in times sufficiently short to permit neglecting heat exchange, this requires a predetermined ff -dt.
  • the limit conditions of this integral are the time at which current flow begins and the time at which the required latent heat of fusion has been supplied to neck 7.
  • the above integral may be referred to as the fusion fF-dt, which is a constant.
  • the fusing point of the overlay will be reached much earlier than the fusing point of the base metal. Fusion of the overlay metal results in diffusion of the molecules of the base metal into the overlay metal and, therefore, in a corrosion of the base metal.
  • the alloys formed between the base metal and the overlay metal have a relatively high resistivity, and therefore the resistance of the neck zone caused by the above corrosion process rises at a rapid rate.
  • a ribbon fuse link having a neck which forms virtually a point-heatsource must have a relatively large heat dissipating area immediately adjacent the neck to normally dissipate the relatively large amount of heat generated at the neck where the current density is very high. Only by providing a relatively large heat dissipating area immediately adjacent the neck can a given current-carrying capacity required for the link be achieved. In other words, the link must form a relatively wide cooling fin for its reduced cross-section portion or neck.
  • FIG. 6 shows the fusing characteristic of the current-limiting fuses illustrated in Figs. 1 to 4 with a thin link-destroying low fusing point metal overlay on the point or points of reduced cross-sectional area.
  • Reference letter D has been applied to this particular characteristic.
  • Fig. 6 is intended to illustrate how the circuit breaker CB and the fuses 31 of Fig. 5 are coordinated. Since the R.M.S. current carried by each fuse 31 is /2 the R.M.S. current carried by each tripping device 22, in drawing the fusing characteristic of Fig.
  • the tripping means 22 of the circuit interrupter CB are adapted to trip the circuit interrupter in the low overload range within shorter times than the blowing or fusing times of the current-limiting fuses 31 as determined by the presence of the link-destroying low fusing point overlay on link 4, and more particularly on the neck portion 7 thereof, or as determined by such an overlay on wire 16 (see Figs. 3 and 4).
  • tripping means 22 of circuit interrupter CB preclude blowing of any of current-limiting fuses 31 at inadmissible or dangerous over-currents less than 3 to 5 times the rated current of rectifier cells 30 and therated current of current-limiting fuses 31.
  • the current carried by any of cells 30 or fuses 31 are of the same order but may vary, say, for about 25%.
  • the cross-over point may be at about four times the current rating of cells 30 and of currentlimiting fuses 31.
  • the cross-over point is usually low compared with prior art applicationsof serially connected current-limiting fuses and automatic circuit interrupters or circuit breakers.
  • the circuit, interrupter CB offers the advantage of enabling rapid reclosing of the overloaded circuit subsequent to tripping of the circuit breaker CB on account of a temporary relatively small overload.
  • silicon rectifier cells can withstand much higher temperatures than germanium cells, yet they may reach their faiure temperatures within a few microseconds. This is due to the fact that in such rectifier cells the current density per square inch of effective barrier layer area is very high, and the heat absorbing capacity of a silicon rectifier cell very small. Considering a silicon rectifier cell having a current rating of amps. D.-C. and 75 amps. of peak surge current, the total volume of such a cell may be in the order of .000227 cubic inch. Lack of any substantial mass capable of any significant heat absorption causes the temperature of silicon rectifier cells to rise very rapidly on occurrence of faults, particularly since the generation of heat is proportional to the second power of the fault current.
  • the line C in Fig. 6 is the response characteristic of a fuse as shown in Figs. 1 to 4 with a fusible element of silver lacking any low fusing point metal overlay thereon.
  • the dotted rectifier cell damage curve A of Fig. 6 indicates the times during which a recifier cell may carry 7 predetermined excess currents without being damaged.
  • This curve crosses the time-current-curve of the currentlimiting fuses at the same point at which the time-current-curve of the current-limiting fuses is crossed by the. tripping characteristic B of the automatic switch or circuit breaker CB.
  • the rectifier cells 30 may either be protected by the current-limiting fuses 31, or the automatic switch or circuit breaker CB. It is apparent from Fig. 6 that the current-limiting fuses 31 are not able to protect the rectifier cells 30 at currents less than I, in which case the circuit breaker CB takes over.
  • the thickness of a ribbon link of silver may be .014", the Width of the neck .020", and the length of the neck .031".
  • the cross-sectional area of that neck is .014" x .020".
  • a neck of such large cross-sectional area can be rapidly destroyed by a layer of tin as thin as .001". Since the amount of silver present in the system is much larger than the amount of tin, or other link-destroying ly to saturate the liquid metal at the operating temperature. That amount of corrosion is sutficient to instantly increase the operating temperature by increased I -r losses, resulting in increased corrosion, etc.
  • the amount of corrosion of the silver neck may be suflicient to instantly raise the neck temperature to the fusion temperature of silver.
  • a protective system for rectifiers comprising a source of alternating current; a rectifier bridge inc uding a plurality of substantially identical semiconductor rectifier cells each having a predetermined current rating connected to said source by leads to be supplied from said source; a plurality of substantially identical current-limiting fuses each connected in series with one of said plurality of rectifier cells, each of said purality of current-limiting fuses comprising a fusible element having a reduced cross-section portion of silver sufficiently narrow and sufficiently short to approximate a point-heat-source when said element is carrying current, an element-destroying low-fusing-point metal overlay on said reduced cross-section portion sufiiciently thin to reduce the actual fusing fi -dt thereof below the fusing fi -dt required for said element in the absence of said overlay and said current-limiting fuse further including blast action means operatively related to said point of reduced cross-section to preclude formation of an arc-gapshunting fulgurite upon fusion of said point of reduced cross-section and inception of an
  • a protective system for rectifiers comprising a source of alternating current; a rectifier cell supplied with current from said source and having a predetermined current rating; a current-limiting fuse arranged in series with said cell rated to continuously carry the same current as said cell; said current-limiting fuse including a pair of aligned spaced conductors having a relatively large cross-sectional area and defining a narrow gap therebetween at the juxtaposed ends thereof, a fusible conductive connection extending across said gap serially connecting said pair of conductors, said conductive connection having sufficiently small dimensions to approximate a point-heat-source when said pair of conductors is carrying current, an alloy-forming low-fusing-point overlay on said conductive connection adapted to reduce the actual fusing ji -dt on said conductive connection 10 below the fusing fi dt required for said conductive connection in the absence of said overlay and wall means of insulating material arranged immediately adjacent said conductive connection adapted to form an arc-extinguishingblast upon fusion of said connection and
  • a protective system for rectifiers comprising a source of alternating current; a pluraity of substantially identical semiconductor rectifier cells each having a predetermined current rating connected to be supplied by said source; a plurality of substantially identical current-limiting fuses having a predetermined current rating each arranged in series with one of said plurality of rectifier cells, each of said plurality of current-limiting fuses in cluding a pair of aligned spaced conductors having a relatively large cross-sectional area and defining a narrow gap therebetween at juxtaposed ends thereof, a conductive connection of silver extending across said gap serially connecting said pair of conductors, said conductive connection having sufiiciently small dimensions to approximate a point-heat-source when said pair of con ductors is carrying current, an alloy-forming low-fusingpoint overlay on said conductive connection adapted to reduce the actual fusing fi -dz of said conductive connection below the fusing fi -dt required for said conductive connection in the absence of said overlay, and wall means of insulating
  • a protected semiconductor rectifier system comprising an A.-C. current supply; a semiconductor rectifier supplied with current from said supply and including a plura ity of rectifier cells each having a predetermined current rating; a plurality of current-limiting fuses each arranged in series with one of said plurality of cells, each of said plurality of fuses including a pair of terminal elements, conductor means having a relatively large width conductively interconnecting said pair of terminal elements, said conductor means comprising a point of reduced cross-section sufficiently small to approximate a point-heat-source when said conductor means is carrying currents, a corrosive low fusing-point overlay adjacent said point of reduced cross-section adapted to reduce the actual fusing fi -dt of said point of reduced cross-section to a smaller value than the fusing fi 'dt required for said point of reduced cross-section in the absence of said overlay, each of said p'urality of fuses further comprising insulating means arranged in close proximity to said point of reduced cross-section closely confi
  • a protected semiconductor rectifier system comprising a nolypnase A.-C. current supply; a polyphase semiconductor rectifier supplied with current from said supply and including a plurality of rectifier cells each having a predetermined current rating; a plurality of currentlimiting fuses each arranged in series with one of said plurality of cells, each of said plurality of fuses including a pair of terminal elements, conductor means having a relatively large width conductively interconnecting said pair of terminal elements, said conductor means comprising a point of reduced cross-section made of silver sufliciently small to approximate a point heat source when said conductor means is carrying current, a corrosive low fusing-point overlay adjacent said point of reduced crosssection adapted to reduce the actual fusing fi -dt of said point of reduced cross-section to a smaller value than the fusing fi -dz required for said point of reduced cross-section in the absence of said overlay, each of said current-limiting fuses further comprising insulating means defining an open passage housing said point of reduced
  • a protective system comprising an electric circuit, a semiconductor rectifier cell having a predetermined current rating arranged in said circuit; a current-limiting fuse arranged in said circuit in series with said cell,said current-limiting fuse including a fusible element having a point of reduced cross-section sufiiciently small to approximate a point-heat-source when said element is carrying current, a low-fusing-point overlay on said point of reduced cross-section adapted to reduce the actual fusing ji -dt required for said element below the fusing fF-dt required for said element in the absence of said overlay,: and said current-limiting fuse further including blast action means operatively related to said point of reduced cross-section adapted to preclude formation of an arcgap-shunting fulgurite upon fusion of said point of re cuted cross-section and inception of an arc; and an auto-.-
  • circuit interrupter having separable contacts arranged in said circuit with said cell and said currentv limiting fuse, said circuit interrupter including tripping; means adapted to trip said circuit interrupter at the occur--,

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US663950A 1957-06-06 1957-06-06 Coordination of current-limiting fuses and circuit interrupters for the protection of semi-conductor rectifiers Expired - Lifetime US2961593A (en)

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DENDAT1073108D DE1073108B (de) 1957-06-06 Überstromschutz fur Halbleitergleichnchteranlagen
US663950A US2961593A (en) 1957-06-06 1957-06-06 Coordination of current-limiting fuses and circuit interrupters for the protection of semi-conductor rectifiers

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3110855A (en) * 1960-07-28 1963-11-12 Ite Circuit Breaker Ltd Polarity sensitive fuse
US3179853A (en) * 1960-02-29 1965-04-20 Chase Shawmut Co Integral semiconductor diode and diode-fuse unit
US3191151A (en) * 1962-11-26 1965-06-22 Fairchild Camera Instr Co Programmable circuit
US3335328A (en) * 1965-10-21 1967-08-08 Burroughs Corp Universal diode matrix package with improved fuse means
US3949340A (en) * 1970-05-22 1976-04-06 Micro Devices Corporation Fuse construction
US4361867A (en) * 1980-01-17 1982-11-30 Robert Bosch Gmbh Electrical connection system for rectifiers
US4920446A (en) * 1986-04-18 1990-04-24 G & W Electric Co. Pyrotechnically-assisted current interrupter

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2703352A (en) * 1953-08-13 1955-03-01 Chase Shawmut Co Fuse and fuse link of the time lag type
US2813243A (en) * 1956-07-12 1957-11-12 Westinghouse Electric Corp Rectifier system
US2823338A (en) * 1953-07-29 1958-02-11 Chaseshawmut Company Coordinated combinations of currentlimiting fuses and circuit interrupters

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2823338A (en) * 1953-07-29 1958-02-11 Chaseshawmut Company Coordinated combinations of currentlimiting fuses and circuit interrupters
US2703352A (en) * 1953-08-13 1955-03-01 Chase Shawmut Co Fuse and fuse link of the time lag type
US2813243A (en) * 1956-07-12 1957-11-12 Westinghouse Electric Corp Rectifier system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3179853A (en) * 1960-02-29 1965-04-20 Chase Shawmut Co Integral semiconductor diode and diode-fuse unit
US3110855A (en) * 1960-07-28 1963-11-12 Ite Circuit Breaker Ltd Polarity sensitive fuse
US3191151A (en) * 1962-11-26 1965-06-22 Fairchild Camera Instr Co Programmable circuit
US3335328A (en) * 1965-10-21 1967-08-08 Burroughs Corp Universal diode matrix package with improved fuse means
US3949340A (en) * 1970-05-22 1976-04-06 Micro Devices Corporation Fuse construction
US4361867A (en) * 1980-01-17 1982-11-30 Robert Bosch Gmbh Electrical connection system for rectifiers
US4920446A (en) * 1986-04-18 1990-04-24 G & W Electric Co. Pyrotechnically-assisted current interrupter

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