WO1996013847A1 - Remote alarm fuse - Google Patents

Remote alarm fuse Download PDF

Info

Publication number
WO1996013847A1
WO1996013847A1 PCT/US1995/013859 US9513859W WO9613847A1 WO 1996013847 A1 WO1996013847 A1 WO 1996013847A1 US 9513859 W US9513859 W US 9513859W WO 9613847 A1 WO9613847 A1 WO 9613847A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuse
current carrying
alarm
parallel
interruption device
Prior art date
Application number
PCT/US1995/013859
Other languages
French (fr)
Inventor
Stephen Whitney
Varinder Kalra
Ron Mollet
Original Assignee
Cooper Industries, Inc.
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
Application filed by Cooper Industries, Inc. filed Critical Cooper Industries, Inc.
Priority to AU40126/95A priority Critical patent/AU4012695A/en
Publication of WO1996013847A1 publication Critical patent/WO1996013847A1/en

Links

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
    • H01H85/30—Means for indicating condition of fuse structurally associated with the fuse
    • 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
    • H01H85/24—Means for preventing insertion of incorrect fuse
    • 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
    • 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
    • H01H85/32—Indicating lamp structurally associated with the protective device

Definitions

  • This invention relates to circuit interruption devices in general and in particular to modular plug-in fuses with blown fuse indication.
  • U.S. Patent No. 3,190,987 shows a plug-in fuse with a holder having three contacts, for line, load, and alarm. When this fuse opens, a spring arm flies up and strikes the contact. In this device the alarm wire and fuse are the same, and thus not suitable for high amperage loads. Also, the interrupting rating is lower than what the telecommunication industry desires .
  • discrete main and alarm fuses are connected electrically in parallel and are mounted in a blade type, plug-in fuse assembly. Under a fault condition, both fuses operate, isolating the voltage source from the load.
  • the alarm fuse has a mechanical mechanism which connects the voltage source to an alarm contact and light emitting diode in the assembly to provide local and remote indication of fuse operation.
  • the main fuse is comprised of individual high performance subminiature fuses, such as surface mount fuses or axial lead fuses, mounted in parallel.
  • the main fuse is then connected in parallel to the alarm fuse.
  • a rejection feature is necessary so that standard automotive fuses do not fit in the fuse block. The rejection feature also insures proper orientation of the fuse for polarization purposes.
  • Fig. 1 shows a schematic diagram of a fuse according to the present invention.
  • Fig. 2 is a side view, partially in section of a fuse according to the present invention.
  • Fig. 3 is a plan view of a fuse block incorporating a light emitting diode as an alarm indicator.
  • Fig. 4 is a side view, partially in section, incorporating a chip fuse with parallel fuse elements.
  • Fig. 5 is a schematic diagram of an alternate embodiment of the present invention.
  • Fig. 6 is a side view, partially in section, illustrating the alternate embodiment shown in Fig. 5.
  • Fig. 7 is a schematic view of an additional embodiment of the present invention.
  • Fig. 8 is a sectional view showing an alarm contact and a source contact with the fuse blade.
  • Fig. 9 is a schematic view of yet an additional embodiment of the present invention.
  • Fig. 10 is a perspective view of a modular fuse according to the present invention.
  • Fig. 1 is a schematic illustration of the fuse according to the present invention referred to in general by the numeral 10.
  • the fuse 10 is comprised of main fuse 20 and alarm assembly 40.
  • Main fuse 20 is comprised of individual subminiature fuses 22, shown in Fig. 2, electrically connected in parallel to two metal blades 32 and 33.
  • Subminiature fuses 22 may be axial fuses or surface mount fuses. These fuses may be wire bonded, thin film, or thick film fuses.
  • Metal blades 33 and 32 plug into fuse block 60 shown in Fig. 3.
  • blade 32 plug into voltage source 31 and not load 34. This is achieved as shown in Fig. 2 by having blade 33 thicker than blade 32.
  • This construction also serves as a rejection feature preventing other types of fuses for example, an automotive fuse from being plugged in to fuse block 60.
  • Other rejection features may be incorporated in fuse 10.
  • blade 33 may be wider than blade 32.
  • blade 33 may be longer than blade 32.
  • blade 33 may be split or forked. Note, either blade may have the rejection feature.
  • An alarm fuse assembly 40 is comprised of a length of wire 42 extending from the load side fuse blade 33 to the alarm fuse 48.
  • wire 42 comprises the features of wire 42 and alarm fuse 48.
  • Alarm fuse 48 is connected to alarm spring 44 which is connected to the voltage source blade 32.
  • An insulating housing encloses the main fuse 20 and alarm fuse assembly 40, shown in Fig. 2
  • Modular fuse 10 is typically installed in a fuse block 60, shown in Fig. 3, electrically connecting the voltage source 31 to load 34.
  • the fuse block 60 also contains an alarm contact 45 and light emitting diode 46, for local indication of fuse operation. Connection to an alarm circuit 49 for remote indication of fuse operation is also provided.
  • fuse block 60 may have multiple positions for fuses, each position having its own load, alarm contacts, and light emitting diode.
  • the main fuse 20 Under normal operating conditions, the main fuse 20 carries the majority of the electrical current since its electrical resistance is much lower than that of the alarm fuse assembly 40.
  • the main fuse 20 and alarm fuse 48 open, isolating the load 34 from the voltage source 31.
  • the alarm spring 44 As the alarm fuse melts, the alarm spring 44 is free to move, completing a conducting path from the voltage source to the light emitting diode and remote alarm circuit through contact 45. This establishes the alarm or open fuse condition, and the light emitting diode 46 and remote alarm 49 are activated.
  • the modular fuse 10 is then extracted from the fuse block and replaced.
  • the individual subminiature fuses 22 which comprise the main fuse 20 are replaced by a single chip fuse 24.
  • the chip fuse 24 may contain multiple fuse elements connected in series or in parallel or in series parallel combinations to achieve the desired operating characteristics.
  • the advantage achieved by using chip fuses are reduction in parts count, and reduction in the number of parts requiring connection to the blades. Using a chip fuse also results in a fuse having a smaller size, lower manufacturing cost, and higher fuse reliability.
  • a light emitting diode 46 and resistor 47 have been incorporated into the chip fuse 24. Diode 46 and resistor 47 is in parallel with main fuse 20.
  • a transparent or translucent insulating housing is used to make the light emitted by the diode 46 visible from the front of the fuse block 60.
  • the advantage of this approach is to further reduce the size of the fuse block.
  • the alarm fuse 48 and spring 44 have been eliminated, further reducing fuse cost and increasing overall alarm system reliability.
  • Transistor circuit 70 is in parallel with main fuse 20. The transistor circuit 70 is incorporated into the fuse block 60 to detect an open circuit caused by an open or missing fuse. Transistor 70 may also be incorporated into fuse 10 rather than into fuse block 60.
  • Fig. 9 is similar to Figs. 6 and 7 with the transistor circuit 70 replaced with an opto isolator circuit 80, which results in a high degree of electrical isolation between the voltage source 31 and the alarm circuit 49.
  • Fig. 10 shows a perspective view of a fuse according to the present invention.
  • Fuse 10 is similar to fuses used in the automotive industry as shown in the drawing. However, those skilled in the art will realize that the present invention is broader in scope than the embodiments shown and pertains to fuses of different sizes, shapes, and capacity.

Abstract

A modular fuse (10) has a main fuse (20) connected in parallel with an alarm circuit assembly (49). The main fuse (20) is comprised of multiple fuse elements connected in parallel or series or series-parallel to give significantly higher circuit capacity. The alarm assembly provides indication of an open fuse. Two current carrying extensions are different in size, shape or length in order to insure proper polarity when the fuse is inserted in an electrical circuit, and to prevent insertion of an improper type of fuse.

Description

REMOTE ALARM FUSE
Background of the Invention
This invention relates to circuit interruption devices in general and in particular to modular plug-in fuses with blown fuse indication.
It is desirable to provide both local and remote indication when a circuit interruption device such as a fuse has opened. It is also necessary to have a fuse which is both small and has a high current interrupting rating. This type device is especially valuable for the telecommunications industry which has a requirement for a 65 volt DC, 20,000 Amperes interrupting rating fuse.
A problem with prior art devices is that they are often bulky, expensive, and have low interrupting ratings. For example, U.S. Patent No. 3,190,987 shows a plug-in fuse with a holder having three contacts, for line, load, and alarm. When this fuse opens, a spring arm flies up and strikes the contact. In this device the alarm wire and fuse are the same, and thus not suitable for high amperage loads. Also, the interrupting rating is lower than what the telecommunication industry desires .
Summary of the Invention
In the present invention, discrete main and alarm fuses are connected electrically in parallel and are mounted in a blade type, plug-in fuse assembly. Under a fault condition, both fuses operate, isolating the voltage source from the load. In one embodiment, the alarm fuse has a mechanical mechanism which connects the voltage source to an alarm contact and light emitting diode in the assembly to provide local and remote indication of fuse operation.
Mounting devices in parallel gives a higher circuit ampacity than could otherwise be achieved. In the preferred embodiment of the invention, the main fuse is comprised of individual high performance subminiature fuses, such as surface mount fuses or axial lead fuses, mounted in parallel. The main fuse is then connected in parallel to the alarm fuse. A rejection feature is necessary so that standard automotive fuses do not fit in the fuse block. The rejection feature also insures proper orientation of the fuse for polarization purposes.
Brief Description of the Drawings
Fig. 1 shows a schematic diagram of a fuse according to the present invention. Fig. 2 is a side view, partially in section of a fuse according to the present invention.
Fig. 3 is a plan view of a fuse block incorporating a light emitting diode as an alarm indicator.
Fig. 4 is a side view, partially in section, incorporating a chip fuse with parallel fuse elements.
Fig. 5 is a schematic diagram of an alternate embodiment of the present invention. Fig. 6 is a side view, partially in section, illustrating the alternate embodiment shown in Fig. 5.
Fig. 7 is a schematic view of an additional embodiment of the present invention. Fig. 8 is a sectional view showing an alarm contact and a source contact with the fuse blade.
Fig. 9 is a schematic view of yet an additional embodiment of the present invention.
Fig. 10 is a perspective view of a modular fuse according to the present invention.
Detailed Description of the Present Invention
Fig. 1 is a schematic illustration of the fuse according to the present invention referred to in general by the numeral 10. The fuse 10 is comprised of main fuse 20 and alarm assembly 40. Main fuse 20 is comprised of individual subminiature fuses 22, shown in Fig. 2, electrically connected in parallel to two metal blades 32 and 33. Subminiature fuses 22 may be axial fuses or surface mount fuses. These fuses may be wire bonded, thin film, or thick film fuses. Metal blades 33 and 32 plug into fuse block 60 shown in Fig. 3.
In order to maintain proper polarity of fuse 10 circuitry, it is necessary to have blade 32 plug into voltage source 31 and not load 34. This is achieved as shown in Fig. 2 by having blade 33 thicker than blade 32. This construction also serves as a rejection feature preventing other types of fuses for example, an automotive fuse from being plugged in to fuse block 60. Other rejection features may be incorporated in fuse 10. For example, blade 33 may be wider than blade 32. Alternatively, blade 33 may be longer than blade 32. Yet another embodiment, blade 33 may be split or forked. Note, either blade may have the rejection feature.
An alarm fuse assembly 40 is comprised of a length of wire 42 extending from the load side fuse blade 33 to the alarm fuse 48. In one embodiment wire 42 comprises the features of wire 42 and alarm fuse 48. Alarm fuse 48 is connected to alarm spring 44 which is connected to the voltage source blade 32. An insulating housing encloses the main fuse 20 and alarm fuse assembly 40, shown in Fig. 2 Modular fuse 10 is typically installed in a fuse block 60, shown in Fig. 3, electrically connecting the voltage source 31 to load 34. The fuse block 60 also contains an alarm contact 45 and light emitting diode 46, for local indication of fuse operation. Connection to an alarm circuit 49 for remote indication of fuse operation is also provided. In practice, fuse block 60 may have multiple positions for fuses, each position having its own load, alarm contacts, and light emitting diode.
Under normal operating conditions, the main fuse 20 carries the majority of the electrical current since its electrical resistance is much lower than that of the alarm fuse assembly 40. When a fault current occurs, the main fuse 20 and alarm fuse 48 open, isolating the load 34 from the voltage source 31. As the alarm fuse melts, the alarm spring 44 is free to move, completing a conducting path from the voltage source to the light emitting diode and remote alarm circuit through contact 45. This establishes the alarm or open fuse condition, and the light emitting diode 46 and remote alarm 49 are activated. The modular fuse 10 is then extracted from the fuse block and replaced.
In Fig. 4, the individual subminiature fuses 22 which comprise the main fuse 20 are replaced by a single chip fuse 24. The chip fuse 24 may contain multiple fuse elements connected in series or in parallel or in series parallel combinations to achieve the desired operating characteristics. The advantage achieved by using chip fuses are reduction in parts count, and reduction in the number of parts requiring connection to the blades. Using a chip fuse also results in a fuse having a smaller size, lower manufacturing cost, and higher fuse reliability. In Figs. 5 and 6, a light emitting diode 46 and resistor 47 have been incorporated into the chip fuse 24. Diode 46 and resistor 47 is in parallel with main fuse 20. A transparent or translucent insulating housing is used to make the light emitted by the diode 46 visible from the front of the fuse block 60. The advantage of this approach is to further reduce the size of the fuse block. In Fig 7, the alarm fuse 48 and spring 44 have been eliminated, further reducing fuse cost and increasing overall alarm system reliability. Transistor circuit 70 is in parallel with main fuse 20. The transistor circuit 70 is incorporated into the fuse block 60 to detect an open circuit caused by an open or missing fuse. Transistor 70 may also be incorporated into fuse 10 rather than into fuse block 60.
In Fig. 8, split contacts 35 and 36 are used to make contact with the voltage source blade 32. This modification of the invention shown in schematic in Fig. 7 results in alarm activation only in the case where an open fuse is installed in the block.
Fig. 9 is similar to Figs. 6 and 7 with the transistor circuit 70 replaced with an opto isolator circuit 80, which results in a high degree of electrical isolation between the voltage source 31 and the alarm circuit 49.
Fig. 10 shows a perspective view of a fuse according to the present invention. Fuse 10 is similar to fuses used in the automotive industry as shown in the drawing. However, those skilled in the art will realize that the present invention is broader in scope than the embodiments shown and pertains to fuses of different sizes, shapes, and capacity.

Claims

1. An electrical circuit interruption device comprising: a housing; a first and a second current carrying leg attached to said housing; a main fuse electrically connecting said current carrying legs,- and an alarm assembly electrically connected in parallel with said main fuse.
2. A circuit interruption device as in Claim 1 wherein said first current carrying leg is thicker than said second current carrying leg.
3. A circuit interruption device as in Claim 1 wherein said first current carrying leg is substantially wider than said second current carrying leg.
4. A circuit interruption device as in Claim 1 wherein said first current carrying leg is longer than said second current carrying leg.
5. A circuit interruption device as in Claim 1 wherein said first current carrying leg is forked.
6. A circuit protection device as in Claim 1 wherein said main fuse is comprised of two or more fuses connected in parallel.
7. A circuit protection device as in Claim 1 wherein said main fuse is comprised of an electrical circuit having fuses connected in a series-parallel arrangement.
8. A circuit protection device as in Claim 1 wherein said alarm assembly is comprised of an alarm fuse in series with a spring.
9. An electrical circuit interruption device as in Claim 1 wherein said alarm assembly is electrically connected to an alarm circuit when said main fuse opens.
10. An electrical circuit interruption device as in Claim 1 wherein said main fuse is a chip fuse comprised of multiple fuse elements.
11. An electrical circuit interruption device as in Claim 10 wherein said main fuse is in a series- parallel circuit .
12. An electrical circuit interruption device as in Claim 1 wherein said alarm assembly is a transistor circuit.
13. An electrical circuit interruption device as in Claim 1 wherein said alarm assembly is an opto isolator circuit .
14. An electrical circuit interruption device as in Claim 1 wherein a diode is connected in parallel with said main fuse.
15. A fuse comprising: a body; a first and a second current carrying extension connected to said body; a main fuse electrically connecting said first and second current carrying extension wherein said main fuse is comprised of multiple subminiature fuses connected in parallel.
16. An electrical circuit interruption device comprising: a housing; a first and a second current carrying leg attached to said housing; a main fuse electrically connecting said current carrying legs; a fuse block, adapted to receive said current carrying legs; and an alarm assembly electrically connected to said legs and in parallel with said main fuse.
PCT/US1995/013859 1994-10-28 1995-10-27 Remote alarm fuse WO1996013847A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU40126/95A AU4012695A (en) 1994-10-28 1995-10-27 Remote alarm fuse

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US33076994A 1994-10-28 1994-10-28
US08/330,769 1994-10-28

Publications (1)

Publication Number Publication Date
WO1996013847A1 true WO1996013847A1 (en) 1996-05-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1995/013859 WO1996013847A1 (en) 1994-10-28 1995-10-27 Remote alarm fuse

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WO (1) WO1996013847A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1130616A2 (en) * 2000-03-03 2001-09-05 Pacific Engineering Corporation Fuse and fuse support
WO2009055243A1 (en) * 2007-10-24 2009-04-30 Cooper Technologies Company Fuse state indicator systems
US8134828B2 (en) 2010-01-21 2012-03-13 Cooper Technologies Company Configurable deadfront fusible panelboard
WO2020193197A1 (en) * 2019-03-22 2020-10-01 Siemens Aktiengesellschaft Device and fuse for direct-current circuits

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2502856A (en) * 1949-06-22 1950-04-04 Walter P Keller Fuse holder and circuit disconnect device
US3801946A (en) * 1973-03-22 1974-04-02 Westinghouse Electric Corp Dropout fuse assembly including improved current limiting fuse structures
USH248H (en) * 1984-09-04 1987-04-07 The United States Of America As Represented By The Secretary Of The Army Fuse status indicator system
US4679877A (en) * 1985-07-17 1987-07-14 Ahroni Joseph M Electric plug with snap-fitted housing components
US5355274A (en) * 1991-11-05 1994-10-11 Cooper Industries, Inc. Fused disconnect
US5479147A (en) * 1993-11-04 1995-12-26 Mepcopal Company High voltage thick film fuse assembly

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2502856A (en) * 1949-06-22 1950-04-04 Walter P Keller Fuse holder and circuit disconnect device
US3801946A (en) * 1973-03-22 1974-04-02 Westinghouse Electric Corp Dropout fuse assembly including improved current limiting fuse structures
USH248H (en) * 1984-09-04 1987-04-07 The United States Of America As Represented By The Secretary Of The Army Fuse status indicator system
US4679877A (en) * 1985-07-17 1987-07-14 Ahroni Joseph M Electric plug with snap-fitted housing components
US5355274A (en) * 1991-11-05 1994-10-11 Cooper Industries, Inc. Fused disconnect
US5479147A (en) * 1993-11-04 1995-12-26 Mepcopal Company High voltage thick film fuse assembly

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1130616A2 (en) * 2000-03-03 2001-09-05 Pacific Engineering Corporation Fuse and fuse support
EP1130616A3 (en) * 2000-03-03 2003-02-05 Pacific Engineering Corporation Fuse and fuse support
US6608546B2 (en) 2000-03-03 2003-08-19 Pacific Engineering Corp. Fuse and fuse support
US7855630B2 (en) 2004-09-13 2010-12-21 Cooper Technologies Company Fuse state indicator systems
US8344844B2 (en) 2004-09-13 2013-01-01 Cooper Technologies Company Fuse state indicator systems
WO2009055243A1 (en) * 2007-10-24 2009-04-30 Cooper Technologies Company Fuse state indicator systems
US8134828B2 (en) 2010-01-21 2012-03-13 Cooper Technologies Company Configurable deadfront fusible panelboard
WO2020193197A1 (en) * 2019-03-22 2020-10-01 Siemens Aktiengesellschaft Device and fuse for direct-current circuits

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