US3183327A - Indicating fuse - Google Patents
Indicating fuse Download PDFInfo
- Publication number
- US3183327A US3183327A US267192A US26719263A US3183327A US 3183327 A US3183327 A US 3183327A US 267192 A US267192 A US 267192A US 26719263 A US26719263 A US 26719263A US 3183327 A US3183327 A US 3183327A
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- Prior art keywords
- piston
- casing
- pair
- caps
- ribbon
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- 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
Definitions
- Dual element fuses comprise two distinct and separate circuit interrupting means, of which one becomes operative upon occurrence of major fault currents, or shortcircuit currrents, while the other interrupting means hecomes operative upon occurrence of relatively small overload currents of inadmissible duration. Interruption of a circuit upon occurrence of relatively small overload currents of inadmissible duration can effectively be carried out by separation of a pair of cooperating contacts.
- Another object of this invention to provide dual element the overload persists for too long a period of time and further adapted to indicate interruption of the circuit, irrespective of whether the interruption is caused by a major fault current, or short-circuit current, or by a relatively small overload current of inadmissible duration.
- Another object of this invention is to provide dual element fuses having a high interrupting capacity and in which so-called follow currents are suppressed when the fuses blow as a result of a major fault current, or shortcircuit current.
- FIG. 1 is a vertical section along a dual element fuse embodying the present invention taken along 11 of FIG. 2;
- FIG. 2 is a vertical section of the dual element fuse of FIG. 1 taken along 22. of FIG. 1;
- FIG. 3 is a top-plan View of the fuse of FIGS. 1 and 2.
- Ribbon 1 is made of a metal having a relatively high conductivi y and a relatively high fusing point, preferably silver. Rectangular perforations 2 in ribbon 1 result in formation of a plurality of serially related points of reduced cross-sectional area along ribbon 1. Ribbon 1 is embedded in a pulverulent arc-quenching substance 3, preferably quartz sand.
- a tubular casing 4 of insulating material as, for instance, a synthetic resin-fiber-glass-cloth laminate, houses ribbon 1 and the pulverulent arc-quenching substance 3. The length of ribbon 1 arranged within casing 4 is less than that of casing 4.
- FIG. 1 The tubular space 4:: inside of casing 4 not coextensive with, and not occupied by, ribbon 1.
- Reference numeral 5 has been applied to indicate a housing or cylinder arranged inside of tubular casing 4 in coaxial relation thereto. Housing 5 occupies the aforementioned tubular space 4a and accommodates a piston 6 and a compressed helical spring 7 biasing piston 6 away from ribbon 1. Housing 5 segregates piston 6 and spring 7 from the arc-quenching substance or filter 3 inside of casing 4.
- Piston rod 8 is arranged below the lower surface of piston 7 and projects transversely through housing 5 toward ribbon 1. Piston rod 8 is made of metal, e.g.
- Pin 10 may be provided at its lower end with a screw-thread (not shown) allowing to screw it into the upper surface of piston 6.
- Housing 5 forms an integral part of a terminal cap 11 mounted on the upper surface of casing 4 and closing the upper end of casing 4.
- terminal cap 11 defines a recess coaxial with casing 4 and extending into casing 4 in a direction longitudinally thereof, and it is this recess which forms a housing 5 accommodating piston 6, spring '7 and insulating pin it Insulating disc 12 is press-fitted into said recess and provided with a central aperture 13 for the passage of pin 10.
- the lower end of casing 4 is closed by a terminal cap 11a mounted on the outer surface of casing 4 and provided with a slot 14 sage of the lower end of ribbon 1 from the inside of casing to the recess which is considerably shallower than the recess provided in cap 11 and the recess in cap 11a is filled with a body 15 of soft solder.
- This body of soft solder establishes a conductive connection between the lower end of ribbon 1 and terminal cap 11a.
- the perforated end surface of lower terminal cap 11a is substantially flush with the lower end of casing 4.
- fusible ribbon 1 On occurrence of major fault currents, or short-circuit currents, fusible ribbon 1 fuses substantially Simultaneously at all its points of reduced cross-sectional area defined by major fault current, or short-circuit current, by fuses is known as follow current. Protracted small follow currents may result in fail are of a fuse subsequent to a successful interruption by it, of a major fault current, or short-circuit current.
- ribbon 1 comprises axially outer or end perforations and axially inner or intermediate perforations.
- Solder joint 11 is arranged immediately adjacent to the upper end perforation. The close proximity of solder joint 11 and the upper end perforation is important for two reasons. Since all points of reduced cross-section of link 1 are virtually simultaneously severed on major fault currents, spring 7 has to drag but a short length of link 1 through filler 3 and, therefore,
- spring 7 does not need to exert a large force and may be relatively compact. If link 1 were severed only adjacent its center a large spring force and a large spring would be required to overcome the friction between link 1 and filler 3 or the fulgurite resulting from fusion of the latter. Since solder joint 11 is arranged at a point remote from that where the highest temperature prevails, the temperatures of solder joint 11 tend to be relatively low. The proximity of solder joint 11 and the upper end perforation in link 1 compensates more or less for the ofcenter location of solder joint 11.
- An electric dual element fuse comprising in combination:
- a pair of terminal caps mounted on the lateral outer surface of said casing, one of said pair of caps having an end surface substantially flush with one of the ends of said casing and being conductively connected to one end of said fusible element and the other of said pair of caps defining a chamber inside said casing housing said piston and said spring and segregating said piston and said spring from said substance, the portion of said other of said pair of caps-deiining said chamber being arranged immediately adjacent to the other of the ends of said casing;
- An electric dual element fuse comprising in combination:
- said housing means including a tubular casing of insulating material projecting beyond said ribbon on one end thereof to provide a tubular space unoccupied by said ribbon;
- an indicator pin arranged on the side of said piston remote from said solder joint and jointly movable with said piston upon fusion of said solder joint as well as upon fusion of said ribbon.
- An electric dual element fuse comprising in combination:
- a fusible ribbon having a plurality of perforations spaced in a direction longitudinally thereof and including end perforations and intermediate perforations, said ribbons being arranged inside 'said casing and having a length shorter than said predetermined length, one end of said ribbon extending to one end of said casing and the other end of said ribbon being spaced from the other end of said casing;
- a dual element fuse comprising in combination:
- a piston inside said recess including a piston rod integral with said piston having one end projecting through said one of said pair of terminal caps into said casing, said piston rod having a slot extending 6 in a direction longitudinally thereof engaged by said another end of said fuse link;
- spring means biasing said piston to cause movement of said piston relative to said casing both in response to fusion of said mass of solder and in response to fusion of said ribbon fuse link at perforations thereof.
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- Fuses (AREA)
Description
May 11, 1965 F. J. KOZACKA INDICATING FUSE Filed March 22, 1963 a 3 5 4 8 9 2 a. G. M M .1... H H m 6 7 M 3 4. 2 G a 5 M a 9 mfl f fi r, f"fldr m TC mm 0 WK an K m R E D E R F.
United States Patent 3,183,327 INDICATING FUSE Frederick J. Kozaclra, South Hampton, N.H., assignor to The Chase-Shawmut Company, N ewburyport, Mass. Filed Mar. 22, 1963, Ser. No. 267,192 4 Claims. (Cl. 200-121) This invention has reference to electric fuses.
It is one object of this invention to provide improved electric fuses of the so-called dual element type which fuses are provided with pin means adapted to indicate blowing of the particular fuse, or to perform some mechanical operation, e.g. closing of a signalling contact, or tripping of a circuit breaker, in response to blowing of the particular fuse.
Dual element fuses comprise two distinct and separate circuit interrupting means, of which one becomes operative upon occurrence of major fault currents, or shortcircuit currrents, while the other interrupting means hecomes operative upon occurrence of relatively small overload currents of inadmissible duration. Interruption of a circuit upon occurrence of relatively small overload currents of inadmissible duration can effectively be carried out by separation of a pair of cooperating contacts.
It is, therefore, another object of this invention to provide dual element the overload persists for too long a period of time and further adapted to indicate interruption of the circuit, irrespective of whether the interruption is caused by a major fault current, or short-circuit current, or by a relatively small overload current of inadmissible duration.
Another object of this invention is to provide dual element fuses having a high interrupting capacity and in which so-called follow currents are suppressed when the fuses blow as a result of a major fault current, or shortcircuit current.
For a better understanding of the invention reference may be had to the accompanying drawings in which:
FIG. 1 is a vertical section along a dual element fuse embodying the present invention taken along 11 of FIG. 2;
FIG. 2 is a vertical section of the dual element fuse of FIG. 1 taken along 22. of FIG. 1; and
FIG. 3 is a top-plan View of the fuse of FIGS. 1 and 2.
Referring now to the drawings, numeral 1 has been applied to indicate a fusible element formed by a multiperforated fusible ribbon. Ribbon 1 is made of a metal having a relatively high conductivi y and a relatively high fusing point, preferably silver. Rectangular perforations 2 in ribbon 1 result in formation of a plurality of serially related points of reduced cross-sectional area along ribbon 1. Ribbon 1 is embedded in a pulverulent arc-quenching substance 3, preferably quartz sand. A tubular casing 4 of insulating material as, for instance, a synthetic resin-fiber-glass-cloth laminate, houses ribbon 1 and the pulverulent arc-quenching substance 3. The length of ribbon 1 arranged within casing 4 is less than that of casing 4. As a result, the upper end of casing 4 projects beyond ribbon 1 at the upper end thereof. This provides a tubular space 4:: inside of casing 4 not coextensive with, and not occupied by, ribbon 1. Reference numeral 5 has been applied to indicate a housing or cylinder arranged inside of tubular casing 4 in coaxial relation thereto. Housing 5 occupies the aforementioned tubular space 4a and accommodates a piston 6 and a compressed helical spring 7 biasing piston 6 away from ribbon 1. Housing 5 segregates piston 6 and spring 7 from the arc-quenching substance or filter 3 inside of casing 4. Piston rod 8 is arranged below the lower surface of piston 7 and projects transversely through housing 5 toward ribbon 1. Piston rod 8 is made of metal, e.g. brass, and has a sufficiently large cross-sectional area to impart to it a larger current carrying capacity than ribbon 1. The lower end of piston rod 8 is slotted at St: and the upper end of ribbon 1 is inserted into the slot formed by piston rod 8. Soft solder joint 9 firmly secures the lower slotted end of piston rod 8 to the upper end of fusible ribbon 1. Liquid solder applied to ribbon 1 adjacent the area thereof overlapped by piston rod 8 flows by capillary action into the slot 8a of the latter, thus tending to establish a firm bond between parts 1 and 8 which has a very small ohmic resistance. Indicator pin it) of electric insulating material is arranged on the upper side of piston 6, or the side thereof remote from solder joint 9. Pin 10 may be provided at its lower end with a screw-thread (not shown) allowing to screw it into the upper surface of piston 6. Housing 5 forms an integral part of a terminal cap 11 mounted on the upper surface of casing 4 and closing the upper end of casing 4. To be more specific, terminal cap 11 defines a recess coaxial with casing 4 and extending into casing 4 in a direction longitudinally thereof, and it is this recess which forms a housing 5 accommodating piston 6, spring '7 and insulating pin it Insulating disc 12 is press-fitted into said recess and provided with a central aperture 13 for the passage of pin 10. The lower end of casing 4 is closed by a terminal cap 11a mounted on the outer surface of casing 4 and provided with a slot 14 sage of the lower end of ribbon 1 from the inside of casing to the recess which is considerably shallower than the recess provided in cap 11 and the recess in cap 11a is filled with a body 15 of soft solder. This body of soft solder establishes a conductive connection between the lower end of ribbon 1 and terminal cap 11a. The perforated end surface of lower terminal cap 11a is substantially flush with the lower end of casing 4.
On occurrence of major fault currents, or short-circuit currents, fusible ribbon 1 fuses substantially Simultaneously at all its points of reduced cross-sectional area defined by major fault current, or short-circuit current, by fuses is known as follow current. Protracted small follow curents may result in fail are of a fuse subsequent to a successful interruption by it, of a major fault current, or short-circuit current.
F danger is eliminated in fuses embodying this invention by virtue of the fact that spring 7 is free, upon fusion of the highest point of reduced cross-section of ribbon 1 On occurrence of relatively small overload currents of moved into inadmissible duration the heat generated at the points of reduced cross-sectional area of ribbon 1 is sufficient to soften solder joint 9. As a result, piston rod 8 and piston 6 are free to move upwardly under the action of spring 7. This establishtes a circuit interrupting gap between ribbon l and piston rod 8. At the same time insulating pin it) is propelled by spring '7beyond casing 4i, thus clearly indicating that the overloaded circuit is interrupted.
As long as the fuse is intact the current path through it is as follows: Cap 11a, solder joint 15, ribbon 1, solder joint 9, piston rod 8, cap 11.
It will be noted that ribbon 1 comprises axially outer or end perforations and axially inner or intermediate perforations. Solder joint 11 is arranged immediately adjacent to the upper end perforation. The close proximity of solder joint 11 and the upper end perforation is important for two reasons. Since all points of reduced cross-section of link 1 are virtually simultaneously severed on major fault currents, spring 7 has to drag but a short length of link 1 through filler 3 and, therefore,
It will also be understood that a relatively large portion of the total length of easing 4 is assigned to housing shortcircuit current interrupting means, resulting in generation of relatively high are voltages.
Having disclosed a preferred embodiment of my invention, it is desired that the same be not limited to the particular structure disclosed. It Will be obvious to any person skilled in the art that many modifications and changes may be made Without departing from the spirit and scope of my invention as set forth in the appended claims.
I claim as my invention:
1. An electric dual element fuse comprising in combination:
(a) a single continuous fusible element adapted to fuse only at relatively high fault currents;
(b) a pulverulent arc-quenching substance embedding said element;
() means for housing said element and said substance, said housing means including a tubular casing of insulating material;
(d) a piston;
(e) a spring biasing said piston;
(f) a pair of terminal caps mounted on the lateral outer surface of said casing, one of said pair of caps having an end surface substantially flush with one of the ends of said casing and being conductively connected to one end of said fusible element and the other of said pair of caps defining a chamber inside said casing housing said piston and said spring and segregating said piston and said spring from said substance, the portion of said other of said pair of caps-deiining said chamber being arranged immediately adjacent to the other of the ends of said casing;
(g) a conductive piston rod arranged on one side of said piston and projecting transversely through said other of said pair of caps toward said fusible element;
(h) a soft solder joint securing said piston rod to said fusible element adapted to soften only at relatively small protracted overload currents; and
(i) an external indicator pin arranged on the side of said piston remote from said solder joint and jointly movable with said piston upon fusion of said fusible element as Well as upon fusion of said solder joint.
2. An electric dual element fuse comprising in combination:
(a) a fusible element formed by a single multiperforated length of ribbon adapted to fuse only at relatively high fault currents;
(b) a pulverulent arc-quenching substance embedding said ribbon;
(0) means for housing said ribbon and said substance, said housing means including a tubular casing of insulating material projecting beyond said ribbon on one end thereof to provide a tubular space unoccupied by said ribbon;
(at) a piston arranged in said space in coaxial relation to said casing;
(e) a compressed spring arranged in said space biasing said piston away from said ribbon;
(f) a pair of terminal caps mounted on the lateral outer surface of said casing, one of said pair of caps having an end surface substantially flush with one of the ends of said casing and conductively connected to one end of said ribbon, and the other of said pair of caps defining a housing inside said casing at said end thereof unoccupied by said ribbon accommodating said piston and said spring and segregating said piston and said spring from said substance;
(g) a piston rod having a larger current-carrying capacity than said ribbon arranged on one side of said piston and projecting transversely through said other of said pair of caps toward said ribbon;
(h) a soft solder joint securing said piston to the end of said ribbon adjacent said other of said pair of caps and adapted to soften only at relatively small protracted overload currents; and
(i) an indicator pin arranged on the side of said piston remote from said solder joint and jointly movable with said piston upon fusion of said solder joint as well as upon fusion of said ribbon.
3 An electric dual element fuse comprising in combination:
(a) a tubular casing of insulating material having a predetermined length;
([2) a fusible ribbon having a plurality of perforations spaced in a direction longitudinally thereof and including end perforations and intermediate perforations, said ribbons being arranged inside 'said casing and having a length shorter than said predetermined length, one end of said ribbon extending to one end of said casing and the other end of said ribbon being spaced from the other end of said casing;
(c) a pair of terminal caps mounted on the lateral outer surface of said casing and closing the ends thereof, one of said pair of caps defining a recess coaxial with said casing and extending into said casing in a direction longitudinally thereof and the other of said pair of caps having an end surface substantially tiush with one of said ends of said casing, said other of said pair of caps being conductively connected to one of the ends of said ribbon;
(d) a piston arranged in said recess;
(2) a compressed helical spring arranged in said recess biasing said piston away from the bottom of said recess;
(f) a pin attached to one side of said piston adapted to project beyond said casing upon movement of said piston under the bias of said spring;
(g) a piston rod secured to the other side of said piston projecting through said one of said pair of caps into said casing, said piston rod having a slot extending in a direction longitudinally thereof and engaged by the other end of said ribbon; and
(h) a solder join-t substantially coextensive with said slot conductively connecting said piston rod to said other end of said ribbon, and said solder joint being 5 arranged immediately adjacent to one of said end perforations of said ribbon.
4. A dual element fuse comprising in combination:
(a) a tubular casing of insulating material;
(b) a pair of terminal caps mounted upon the lateral outer surface of said casing and closing said casing, one of said pair of caps defining a recess coaxial with said casing and extending into said casing and the other of said pair of caps having an end surface substantially flush with one end of said casing;
(c) a multiperforated ribbon fuse link having one end immediately adjacent to the end surface of said one of said pair of caps and conductively connected to said one of said pair of caps and said fuse link having another end spaced from one of the ends of said casing;
(d) a pulverulent arc-quenching filler inside said casing embedding said ribbon fuse link;
(e) a piston inside said recess including a piston rod integral with said piston having one end projecting through said one of said pair of terminal caps into said casing, said piston rod having a slot extending 6 in a direction longitudinally thereof engaged by said another end of said fuse link;
(f) a mass of solder inside said slot conductively connecting said end of said piston rod to said another end of said ribbon fuse link; and
(g) spring means biasing said piston to cause movement of said piston relative to said casing both in response to fusion of said mass of solder and in response to fusion of said ribbon fuse link at perforations thereof.
References Cited by the Examiner UN TED STATES PATENTS 2,026,381 12/35 Fiedler 200121 2,321,711 6/43 Taylor 200-123 FOREIGN PATENTS 180,824 6/22 Great Britain.
542,667 5/56 Belgium.
BERNARD A. GILHEANY, Primary Examiner.
Claims (1)
1. AN ELECTRIC DUAL ELEMENT FUSE COMPRISING IN COMBINATION: (A) A SINGLE CONTINUOUS FUSIBLE ELEMENT ADAPTED TO FUSE ONLY AT RELATIVELY HIGH FAULT CURRENTS; (B) A PULVERULENT ARC-QUENCHING SUBSTANCE EMBEDDING SAID ELEMENT; (C) MEANS FOR HOUSING SAID ELEMENT AND SAID SUBSTANCE, SAID HOUSING MEANS INCLUDING A TUBULAR CASING OF INSULATING MATERIAL; (D) A PISTON; (E) A SPRING BIASING SAID PISTON; (F) A PAIR OF TERMINAL CAPS MOUNTED ON THE LATERAL OUTER SURFACE OF SAID CASING, ONE OF SAID PAIR OF CAPS HAVING AN END SURFACE SUBSTANTIALLY FLUSH WITH ONE OF THE ENDS OF SAID CASING AND BEING CONDUCTIVELY CONNECTED TO ONE END OF SAID FUSIBLE ELEMENT AND THE OTHER OF SAID PAIR OF CAPS DEFINING A CHAMBER INSIDE SAID CASING HOUSING SAID PISTON AND SAID SPRING AND SEGREGATING SAID PISTON AND SAID SPRING FROM SAID SUBSTANCE, THE PORTION OF SAID OTHER OF SAID PAIR OF CAPS-DEFINING SAID CHAMBER BEING ARRANGED IMMEDIATELY ADJACENT TO THE OTHER OF THE ENDS OF SAID CASING; (G) A CONDUCTIVE PISTON ROD ARRANGED ON ONE SIDE OF SAID PISTON AND PROJECTING TRANSVERSELY THROUGH SAID OTHER OF SAID PAIR OF CAPS TOWARD SAID FUSIBLE ELEMENT; (H) A SOFT PAIR OF CAPS TOWARD SAID FUSIBLE ELEMENT; FUSIBLE ELEMENT ADAPTED TO SOFTEN ONLY AT RELATIVELY SMALL PROTRACTED OVERLOAD CURRENTS; AND (I) AN EXTERNAL INDICATOR PIN ARRANGED ON THE SIDE OF SAID PISTON REMOTE FROM SAID SOLDER JOINT AND JOINTLY MOVABLE WITH SAID PISTON UPON FUSION OF SAID FUSIBLE ELEMENT AS WELL AS UPON FUSION OF SAID SOLDER JOINT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US267192A US3183327A (en) | 1963-03-22 | 1963-03-22 | Indicating fuse |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US267192A US3183327A (en) | 1963-03-22 | 1963-03-22 | Indicating fuse |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3183327A true US3183327A (en) | 1965-05-11 |
Family
ID=23017705
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US267192A Expired - Lifetime US3183327A (en) | 1963-03-22 | 1963-03-22 | Indicating fuse |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US3183327A (en) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3281557A (en) * | 1965-10-22 | 1966-10-25 | Mc Graw Edison Co | Indicator fuse for electric circuits |
| US3319029A (en) * | 1966-02-07 | 1967-05-09 | Jr Philip C Jacobs | High-voltage fuses having zig-zagshaped fuse link |
| US3342964A (en) * | 1967-03-24 | 1967-09-19 | Chase Shawmut Co | Dual element cartridge fuse for small current intensities |
| US3416114A (en) * | 1964-09-26 | 1968-12-10 | Int Standard Electric Corp | Plug-in type flat fuse |
| US3483501A (en) * | 1968-06-17 | 1969-12-09 | Chase Shawmut Co | Electric cartridge fuse |
| US3523264A (en) * | 1967-03-30 | 1970-08-04 | English Electric Co Ltd | Fuse links |
| US3663915A (en) * | 1970-12-15 | 1972-05-16 | Chase Shawmut Co | Electric cartridge fuses with blown fuse indicator |
| US4032877A (en) * | 1976-05-03 | 1977-06-28 | Mcgraw-Edison Company | Protector for electric circuits |
| US4153893A (en) * | 1977-09-27 | 1979-05-08 | S&C Electric Company | End fitting for high-voltage fuse |
| US4204182A (en) * | 1978-05-01 | 1980-05-20 | Gould Inc. | Indicating or striker pin for electric fuses |
| US5659283A (en) * | 1994-12-30 | 1997-08-19 | Arratia; Jose F. | Indicating fuse block |
| USRE36317E (en) * | 1994-12-30 | 1999-09-28 | Arratia; Jose F. | Indicating fuse block |
| US20080117015A1 (en) * | 2006-11-22 | 2008-05-22 | Thomas & Betts International, Inc. | Fuse providing circuit isolation and visual interruption indication |
| US11302506B1 (en) * | 2020-04-20 | 2022-04-12 | Norberg-IES, LLC | High voltage fuse adapter system and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE542637A (en) * | ||||
| GB180824A (en) * | 1921-04-02 | 1922-06-08 | Hermann Abraham Erdbrink | Improvements in enclosed electric fuses |
| US2026381A (en) * | 1934-03-13 | 1935-12-31 | Gen Electric | High voltage primary cut-out |
| US2321711A (en) * | 1939-05-12 | 1943-06-15 | Chase Shawmut Co | Fusible electric protective device |
-
1963
- 1963-03-22 US US267192A patent/US3183327A/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE542637A (en) * | ||||
| GB180824A (en) * | 1921-04-02 | 1922-06-08 | Hermann Abraham Erdbrink | Improvements in enclosed electric fuses |
| US2026381A (en) * | 1934-03-13 | 1935-12-31 | Gen Electric | High voltage primary cut-out |
| US2321711A (en) * | 1939-05-12 | 1943-06-15 | Chase Shawmut Co | Fusible electric protective device |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3416114A (en) * | 1964-09-26 | 1968-12-10 | Int Standard Electric Corp | Plug-in type flat fuse |
| US3281557A (en) * | 1965-10-22 | 1966-10-25 | Mc Graw Edison Co | Indicator fuse for electric circuits |
| US3319029A (en) * | 1966-02-07 | 1967-05-09 | Jr Philip C Jacobs | High-voltage fuses having zig-zagshaped fuse link |
| US3342964A (en) * | 1967-03-24 | 1967-09-19 | Chase Shawmut Co | Dual element cartridge fuse for small current intensities |
| US3523264A (en) * | 1967-03-30 | 1970-08-04 | English Electric Co Ltd | Fuse links |
| US3483501A (en) * | 1968-06-17 | 1969-12-09 | Chase Shawmut Co | Electric cartridge fuse |
| US3663915A (en) * | 1970-12-15 | 1972-05-16 | Chase Shawmut Co | Electric cartridge fuses with blown fuse indicator |
| US4032877A (en) * | 1976-05-03 | 1977-06-28 | Mcgraw-Edison Company | Protector for electric circuits |
| US4153893A (en) * | 1977-09-27 | 1979-05-08 | S&C Electric Company | End fitting for high-voltage fuse |
| US4204182A (en) * | 1978-05-01 | 1980-05-20 | Gould Inc. | Indicating or striker pin for electric fuses |
| US5659283A (en) * | 1994-12-30 | 1997-08-19 | Arratia; Jose F. | Indicating fuse block |
| USRE36317E (en) * | 1994-12-30 | 1999-09-28 | Arratia; Jose F. | Indicating fuse block |
| US20080117015A1 (en) * | 2006-11-22 | 2008-05-22 | Thomas & Betts International, Inc. | Fuse providing circuit isolation and visual interruption indication |
| US7724122B2 (en) * | 2006-11-22 | 2010-05-25 | Thomas & Betts International, Inc. | Fuse providing circuit isolation and visual interruption indication |
| US11302506B1 (en) * | 2020-04-20 | 2022-04-12 | Norberg-IES, LLC | High voltage fuse adapter system and method |
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