WO2016096587A1 - An electric protective element holder assembly - Google Patents

An electric protective element holder assembly Download PDF

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Publication number
WO2016096587A1
WO2016096587A1 PCT/EP2015/079196 EP2015079196W WO2016096587A1 WO 2016096587 A1 WO2016096587 A1 WO 2016096587A1 EP 2015079196 W EP2015079196 W EP 2015079196W WO 2016096587 A1 WO2016096587 A1 WO 2016096587A1
Authority
WO
WIPO (PCT)
Prior art keywords
conductive portion
assembly
base part
hollow
protective element
Prior art date
Application number
PCT/EP2015/079196
Other languages
French (fr)
Inventor
Jari Arto UUSITALO
Juha Antero Manninen
Timo Artturi SKIPPARI
Juha Heikki KUULUVAINEN
Original Assignee
Eaton Power Quality Oy
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 Eaton Power Quality Oy filed Critical Eaton Power Quality Oy
Publication of WO2016096587A1 publication Critical patent/WO2016096587A1/en

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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
    • H01H85/54—Protective devices wherein the fuse is carried, held, or retained by an intermediate or auxiliary part removable from the base, or used as sectionalisers
    • H01H85/62—Protective devices wherein the fuse is carried, held, or retained by an intermediate or auxiliary part removable from the base, or used as sectionalisers the intermediate or auxiliary part being adapted for screwing into the base

Definitions

  • the invention relates to an electric protective element holder assembly, particularly a fuse holder assembly suitable to establishing a secured electric connection between a wire for low power applications like a small gauge or sense wire for measuring purposes or feeding auxiliary electric circuits and a power circuit such as a high voltage and/or high current busbar.
  • Small gauge and sense wires are commonly used in electric and electronic equipment and systems for measuring purposes and for feeding auxiliary circuits. Such wires are often attached to circuits having overcurrent protection dimensioned for several hundreds of amps. Without sufficient overcurrent or short circuit protection such wires may cause a considerable risk for the safety of electric or electronic equipment.
  • the present invention is based on the idea to design a holder assembly for an electric protective element, which can easily be connected to an energized part of an electric circuit such as to a busbar of a power circuit and efficiently protect a wire such as a small gauge or sense wire from overcurrent of the electric circuit.
  • the holder assembly is also designed to isolate the protective element and the wire connector from the electric circuit to which the assembly is attached so that the risk of a short circuit of the wire and the electric circuit is further reduced.
  • An embodiment of the invention relates to an electric protective element holder assembly
  • a base part having a first conductive portion for attaching the assembly to an electrically energized part of an electric circuitry and a second conductive portion, wherein the first and second conductive portions are electrically connected to each other, and a hollow, insulating part having a wire connector and means for attaching it to the second conductive portion of the base part, wherein the hollow, insulating part forms a holder for the electric protective element such that the second conductive portion of the base part is electrically connected over the protective element to the wire connector when the hollow part is attached to the second portion of the base part.
  • the second conductive portion of the base part may comprise a thread and the means for attaching the hollow, insulating part to the second conductive portion may comprise a thread for screwing it on the thread of the second conductive portion.
  • the means for attaching the hollow, insulating part to the second conductive portion may comprise a bayonet coupling.
  • the first conductive portion may comprise a thread for screwing it in a threaded hole of the electrically energized part of the electric circuitry.
  • the base part may comprise a middle portion with the first and the second portions being provided on opposite sides of the middle portion.
  • the middle portion may be made of an insulating material enclosing a conductive portion electrically connecting the first conductive portion with the second conductive portion.
  • the middle portion may be made of metal, particularly brass, which electrically connects the first conductive portion with the second conductive portion.
  • a conductive spring element may be positioned within the hollow, insulating part between the resistive element and the wire connector such that an electrical contact of the resistive element is pressed on the second conductive portion to electrically contact the resistive element with the first conductive portion.
  • the assembly may further comprise a mounting plate having first fixation means for fixing the first conductive portion on the mounting plate and second fixation means for attaching the assembly to the electrically energized part of the electric circuitry.
  • the mounting plate may be formed as an integral part of the base part. Alternatively, the mounting plate may be formed as a separate entity.
  • the protective element may be a fuse, a resistor, particularly a PTC resistor, or a diode.
  • the hollow, insulating part and the protective element may be formed as an integral component.
  • the hollow, insulating part and the protective element may also be integrated in a standard screw head comprising also the second conductive portion.
  • Fig. 1 shows a sectional view of a first embodiment of the electric protective element holder assembly according to the invention
  • Fig. 2 shows a sectional view of a second embodiment of the electric protective element holder assembly according to the invention
  • Fig. 3 shows a sectional view of a third embodiment of the electric protective element holder assembly according to the invention
  • Fig. 4 shows a sectional view of a fourth embodiment of the electric protective element holder assembly according to the invention.
  • Fig.5 shows a sectional view of a fifth embodiment of the electric protective element holder assembly and a top view on mounting plate of the assembly according to the invention
  • the present invention outlines a component, which can be used to attach sense wires to main circuit bolt heads or busbars to provide fuse, impedance, or polarity protection for such wires.
  • a threaded hole in a bolt-head or in a busbar or a through hole in a busbar can be used to attach a special fuse holder according to the invention to the main circuit.
  • the other pole of the fuse is provided for the sense wire to be attached to it.
  • several fuse sizes may be considered according to the available short circuit current at the point of connection.
  • This same fundamental idea can be used to hold a resistor with sufficiently large resistance value, so that the fault current resulting from the insulation fault of the sense wire will be limited to a sufficiently low value.
  • a diode could be used to prevent a false polarity from causing damage to the electronic circuits connected to it.
  • Common denominator is to mechanically attach the holder assembly directly to an energized part. This will avoid any and all unprotected sense wiring in the system.
  • Standard bolts used in the system power circuit can be replaced by a bolt having a threaded hole in its head. This threaded hole can be used to attach a specially designed electric protective element holder assembly such as fuse or resistor holder to it.
  • a suitable means of connection will be made available for connecting the wire to be protected.
  • the threaded hole can be in a busbar or in an equal energized system component as well.
  • the hole in the bolt head can be large enough to allow for example a 5x20mm fuse and a fuse holder assembly according to the invention to fit in.
  • a hole of this size M8 thread in M10 bolt
  • M3 to M5 threaded hole is needed in the bolt head, and a base part of the two-piece fuse holder assembly according to the invention can be attached to it.
  • the fuse will not penetrate into the bolt head, but will be entirely enclosed by the fuse holder.
  • Both parts of the fuse holder may be made of an insulating material, but for mechanical rigidity, the base part attaching to the bolt head may be made of metal (e.g. brass) as well.
  • Fig. 1 shows a sectional view of a holder assembly 10 for an electric fuse 26 serving as electric protective element.
  • the assembly 10 can be mounted on the screw head of an energized screw 16 of an electric power circuit, for example a high current busbar, or directly connected to an energized busbar or comparable energized components like a heatsink.
  • the assembly 10 comprises a tube-like shaped cap 22 made from an insulating material for receiving and holding the fuse 26.
  • the cap 22 comprises on one end a wire connector 24 for a small gauge or sense wire 25. The other end is open and comprises a thread for screwing the second conductive portion 18 of a base part 12 of the assembly 10.
  • a metal coil spring 34 is positioned between one electric contact of the fuse 26 and an electric contact of the wire connector 24.
  • the spring 34 presses the other electric contact of the fuse 26 on the second conductive portion 18 of the base part 12.
  • the base part 12 comprises a middle portion 32, which can be disk- like shaped and made from an insulating material with a conductive core electrically connecting the second conductive portion 18 with a first conductive portion 14 having a thread 28 for screwing it in a threaded hole 30 of the screw head of the energized screw 16.
  • the wire 25 is electrically connected to the energized screw 16 via the base part 12, the fuse 26, the spring 34 and the wire connector 24 establishing an overcurrent protected connection.
  • the cap 22 While in the assembly shown in Fig. 1, the cap 22 entirely encloses the fuse 26, it is also possible to use a screw as first and second conductive portions of the base part, as the assemblies 12' and 12" show in Figs. 2 and 3, respectively.
  • the assemblies of Fig. 2 and 3 differ from the one of Fig. 1 in the design of the middle portion of the base part 12', 12".
  • the middle portion is designed as plug 32', 32", which can be made from an insulating material such as plastic.
  • the plugs 32', 32" comprise outer threads 20', 20" for screwing the cap 22 on them and a through hole and a borehole for receiving a screw.
  • the screw head 18', 18" is put in the borehole of the plug 32', 32" so that the borehole wall 33, 33' at least partly overlaps the screw head 18', 18".
  • the borehole wall 33 overlaps the screw head 18'
  • the borehole wall 33 ' also overlaps the first contact 36 of the fuse.
  • the embodiment of Fig. 3 has the advantage that the fuse 36 is held by the borehole wall 33' which makes installation of the fuse holder 10" easier.
  • the screw head 18', 18" form the second conductive portion of the base part 12', 12" contacting the fuse contact 36.
  • the screw body 14', 14" forms the first conductive portion of the base part 12', 12" and as screwed in the threaded hole 30 of the energized screw 16.
  • the plug 32', 32" is first fixed with the screw 14', 18', 14", 18" in the screw head of the energized screw 16. Then the cap 22 with the fuse 26 is screwed on the plug 32', 32". A wire can then be easily connected to the wire connector 24.
  • FIG. 4 An embodiment with smaller dimensions due to another, smaller electric fuse 26', but in principle similar to the one of Fig. 1 is shown in Fig. 4.
  • FIG. 5 An embodiment with a mounting plate 38 for fixing the holder assembly 10" " at a standard energized screw 16' without a thread hole in its head is shown in Fig. 5.
  • the mounting plate 38 comprises a bore 42 for receiving the energized screw 16' of a high current bus bar and a threaded bore 40 for screwing in the first conductive portion of the base part of the holder assembly 10" ".
  • the holder assembly of an electric protective element according to the present invention can be used instead of using unprotected sense wires or wires feeding for example internal housekeeping functions.
  • unprotected sense wires or wires feeding for example internal housekeeping functions.
  • fuse holders there will always be some length of unprotected wire in the system.
  • inventive holder assembly of an electric protective device is directly mounted to the energized circuit, no unprotected wires need to exist in the system, resulting in a safety improvement.
  • voltage sensing circuits typically contain some high impedance resistors. Locating some of this measurement circuit impedance into the connection point of the sense wire will effectively protect the sense wire and the entire equipment in case of an insulation failure of the sense wire.
  • fuses with different physical dimensions may be used. Generally, fuses with different dimensions would require a specific fuse holder for each different type.
  • a third option would be to use the same principle to hold a diode. This could be valuable in DC-powered circuits to prevent damage caused by reversed polarity of the DC-supply.
  • the present invention could be used in all electric or electronic equipment where some of its internal wiring is not protected by the overcurrent or short circuit protective devices fitted at the input power feed of the system or equipment.
  • UPSs Uninterruptible Power Supplies
  • variable speed drives elevators, lifts, escalators, switchgear
  • industrial automation traction applications
  • power plants etc.
  • resistor being used to act as protective impedance, and if such impedance is properly selected, its failure is not probable. Under such conditions the resistor and the suitable connector could be directly integrated into one component of the holder assembly to be attached directly to the energized circuit as described above.
  • the present invention has the following advantages: it allows removing practically all unprotected wiring from electric or electronic equipment; it can be designed to provide fuse protection or protective impedance to protect such wires; it can use assembly locations already existing in the system (e.g. bolt heads, busbars); it usually does not require additional real estate within the equipment (depth excluded).

Abstract

The invention relates to an electric protective element holder assembly (10) comprising a base part (12) having a first conductive portion (14) for attaching the assembly to an electrically energized part (16) of an electric circuitry and a second conductive portion (18), wherein the first and second conductive portions are electrically connected to each other, a hollow, insulating part (22) having a wire connector (24) and means for attaching it to the second conductive portion of the base part, wherein the hollow, insulating part forms a holder for the electric protective element (26) such that the second conductive portion of the base part is electrically connected over the protective element to the wire connector when the hollow part is attached to the thread of the second portion of the base part.

Description

AN ELECTRIC PROTECTIVE ELEMENT HOLDER ASSEMBLY
The invention relates to an electric protective element holder assembly, particularly a fuse holder assembly suitable to establishing a secured electric connection between a wire for low power applications like a small gauge or sense wire for measuring purposes or feeding auxiliary electric circuits and a power circuit such as a high voltage and/or high current busbar.
BACKGROUND
Small gauge and sense wires are commonly used in electric and electronic equipment and systems for measuring purposes and for feeding auxiliary circuits. Such wires are often attached to circuits having overcurrent protection dimensioned for several hundreds of amps. Without sufficient overcurrent or short circuit protection such wires may cause a considerable risk for the safety of electric or electronic equipment.
SUMMARY OF INVENTION It is an object of the present invention to propose a technical solution for attaching a wire such as a small gauge or sense wire to a power circuit, and protecting electrical equipment connected to the wire against high current, particularly over current.
This object is achieved by the subject matter of the independent claims. Further embodiments are shown by the dependent claims. The present invention is based on the idea to design a holder assembly for an electric protective element, which can easily be connected to an energized part of an electric circuit such as to a busbar of a power circuit and efficiently protect a wire such as a small gauge or sense wire from overcurrent of the electric circuit. The holder assembly is also designed to isolate the protective element and the wire connector from the electric circuit to which the assembly is attached so that the risk of a short circuit of the wire and the electric circuit is further reduced.
An embodiment of the invention relates to an electric protective element holder assembly comprising a base part having a first conductive portion for attaching the assembly to an electrically energized part of an electric circuitry and a second conductive portion, wherein the first and second conductive portions are electrically connected to each other, and a hollow, insulating part having a wire connector and means for attaching it to the second conductive portion of the base part, wherein the hollow, insulating part forms a holder for the electric protective element such that the second conductive portion of the base part is electrically connected over the protective element to the wire connector when the hollow part is attached to the second portion of the base part.
The second conductive portion of the base part may comprise a thread and the means for attaching the hollow, insulating part to the second conductive portion may comprise a thread for screwing it on the thread of the second conductive portion. Alternatively, the means for attaching the hollow, insulating part to the second conductive portion may comprise a bayonet coupling.
The first conductive portion may comprise a thread for screwing it in a threaded hole of the electrically energized part of the electric circuitry.
The base part may comprise a middle portion with the first and the second portions being provided on opposite sides of the middle portion.
The middle portion may be made of an insulating material enclosing a conductive portion electrically connecting the first conductive portion with the second conductive portion. Alternatively, the middle portion may be made of metal, particularly brass, which electrically connects the first conductive portion with the second conductive portion. A conductive spring element may be positioned within the hollow, insulating part between the resistive element and the wire connector such that an electrical contact of the resistive element is pressed on the second conductive portion to electrically contact the resistive element with the first conductive portion.
The assembly may further comprise a mounting plate having first fixation means for fixing the first conductive portion on the mounting plate and second fixation means for attaching the assembly to the electrically energized part of the electric circuitry.
The mounting plate may be formed as an integral part of the base part. Alternatively, the mounting plate may be formed as a separate entity.
The protective element may be a fuse, a resistor, particularly a PTC resistor, or a diode.
The hollow, insulating part and the protective element may be formed as an integral component.
The hollow, insulating part and the protective element may also be integrated in a standard screw head comprising also the second conductive portion.
These and other aspects of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter.
The invention will be described in more detail hereinafter with reference to exemplary embodiments. However, the invention is not limited to these exemplary embodiments.
BRIEF DESCRIPTION OF DRAWINGS
Fig. 1 shows a sectional view of a first embodiment of the electric protective element holder assembly according to the invention;
Fig. 2 shows a sectional view of a second embodiment of the electric protective element holder assembly according to the invention; Fig. 3 shows a sectional view of a third embodiment of the electric protective element holder assembly according to the invention;
Fig. 4 shows a sectional view of a fourth embodiment of the electric protective element holder assembly according to the invention; and
Fig.5 shows a sectional view of a fifth embodiment of the electric protective element holder assembly and a top view on mounting plate of the assembly according to the invention;
DESCRIPTION OF EMBODIMENTS
In the following, functionally similar or identical elements may have the same reference numerals. Absolute values are shown below by way of example only and should not be construed as limiting the invention.
The present invention outlines a component, which can be used to attach sense wires to main circuit bolt heads or busbars to provide fuse, impedance, or polarity protection for such wires. A threaded hole in a bolt-head or in a busbar or a through hole in a busbar can be used to attach a special fuse holder according to the invention to the main circuit. The other pole of the fuse is provided for the sense wire to be attached to it. As the fuse needs to have sufficient interrupt current rating, several fuse sizes may be considered according to the available short circuit current at the point of connection. This same fundamental idea can be used to hold a resistor with sufficiently large resistance value, so that the fault current resulting from the insulation fault of the sense wire will be limited to a sufficiently low value. Also, in DC- circuits a diode could be used to prevent a false polarity from causing damage to the electronic circuits connected to it.
In the following, multiple possible constructions of the holder assembly according to the present invention are described. Common denominator is to mechanically attach the holder assembly directly to an energized part. This will avoid any and all unprotected sense wiring in the system. Standard bolts used in the system power circuit can be replaced by a bolt having a threaded hole in its head. This threaded hole can be used to attach a specially designed electric protective element holder assembly such as fuse or resistor holder to it. At the other end of the holder assembly a suitable means of connection will be made available for connecting the wire to be protected. The threaded hole can be in a busbar or in an equal energized system component as well. In one implementation, the hole in the bolt head can be large enough to allow for example a 5x20mm fuse and a fuse holder assembly according to the invention to fit in. As the hole of this size (M8 thread in M10 bolt) already reduces the strength of the bolt considerably, in another implementation only a M3 to M5 threaded hole is needed in the bolt head, and a base part of the two-piece fuse holder assembly according to the invention can be attached to it. The fuse will not penetrate into the bolt head, but will be entirely enclosed by the fuse holder. Both parts of the fuse holder may be made of an insulating material, but for mechanical rigidity, the base part attaching to the bolt head may be made of metal (e.g. brass) as well.
Various protective circuit elements can be used in conjunction with this invention. Those include but are not limited to the ones shown below along with few possible constructional examples described with reference to the accompanying drawings in the following in detail:
Fig. 1 shows a sectional view of a holder assembly 10 for an electric fuse 26 serving as electric protective element. The assembly 10 can be mounted on the screw head of an energized screw 16 of an electric power circuit, for example a high current busbar, or directly connected to an energized busbar or comparable energized components like a heatsink. The assembly 10 comprises a tube-like shaped cap 22 made from an insulating material for receiving and holding the fuse 26. The cap 22 comprises on one end a wire connector 24 for a small gauge or sense wire 25. The other end is open and comprises a thread for screwing the second conductive portion 18 of a base part 12 of the assembly 10. A metal coil spring 34 is positioned between one electric contact of the fuse 26 and an electric contact of the wire connector 24. The spring 34 presses the other electric contact of the fuse 26 on the second conductive portion 18 of the base part 12. The base part 12 comprises a middle portion 32, which can be disk- like shaped and made from an insulating material with a conductive core electrically connecting the second conductive portion 18 with a first conductive portion 14 having a thread 28 for screwing it in a threaded hole 30 of the screw head of the energized screw 16. By this construction, the wire 25 is electrically connected to the energized screw 16 via the base part 12, the fuse 26, the spring 34 and the wire connector 24 establishing an overcurrent protected connection. By mechanically attaching the holder assembly 10 to the energized screw 16, any and all unprotected sense wiring can be avoided.
While in the assembly shown in Fig. 1, the cap 22 entirely encloses the fuse 26, it is also possible to use a screw as first and second conductive portions of the base part, as the assemblies 12' and 12" show in Figs. 2 and 3, respectively. The assemblies of Fig. 2 and 3 differ from the one of Fig. 1 in the design of the middle portion of the base part 12', 12". In Figs. 2 and 3, the middle portion is designed as plug 32', 32", which can be made from an insulating material such as plastic. The plugs 32', 32" comprise outer threads 20', 20" for screwing the cap 22 on them and a through hole and a borehole for receiving a screw. The screw head 18', 18" is put in the borehole of the plug 32', 32" so that the borehole wall 33, 33' at least partly overlaps the screw head 18', 18". In the embodiment of Fig. 2, the borehole wall 33 overlaps the screw head 18', while in the embodiment of Fig. 3 the borehole wall 33 ' also overlaps the first contact 36 of the fuse. The embodiment of Fig. 3 has the advantage that the fuse 36 is held by the borehole wall 33' which makes installation of the fuse holder 10" easier. The screw head 18', 18" form the second conductive portion of the base part 12', 12" contacting the fuse contact 36. The screw body 14', 14" forms the first conductive portion of the base part 12', 12" and as screwed in the threaded hole 30 of the energized screw 16. For installing the assembly 10', 10", the plug 32', 32" is first fixed with the screw 14', 18', 14", 18" in the screw head of the energized screw 16. Then the cap 22 with the fuse 26 is screwed on the plug 32', 32". A wire can then be easily connected to the wire connector 24.
An embodiment with smaller dimensions due to another, smaller electric fuse 26', but in principle similar to the one of Fig. 1 is shown in Fig. 4.
An embodiment with a mounting plate 38 for fixing the holder assembly 10" " at a standard energized screw 16' without a thread hole in its head is shown in Fig. 5. The mounting plate 38 comprises a bore 42 for receiving the energized screw 16' of a high current bus bar and a threaded bore 40 for screwing in the first conductive portion of the base part of the holder assembly 10" ". In the following, some examples of usage and advantages of the present invention over the prior art are described:
The holder assembly of an electric protective element according to the present invention can be used instead of using unprotected sense wires or wires feeding for example internal housekeeping functions. When using conventional and commercially available fuse holders, there will always be some length of unprotected wire in the system. As the inventive holder assembly of an electric protective device is directly mounted to the energized circuit, no unprotected wires need to exist in the system, resulting in a safety improvement.
When comparing the present invention to the existing technology, also the number of unreliable connections may get reduced. The same applies for the need of mechanical mounting provisions.
Typically voltage sensing circuits contain some high impedance resistors. Locating some of this measurement circuit impedance into the connection point of the sense wire will effectively protect the sense wire and the entire equipment in case of an insulation failure of the sense wire.
When feeding power to housekeeping functions a resistor cannot be used, and a fuse is needed instead. Using a fuse may be justified also in sensing circuits when low impedance of the circuit is required.
Depending on the required interrupt rating of the fuse, fuses with different physical dimensions may be used. Generally, fuses with different dimensions would require a specific fuse holder for each different type.
A third option would be to use the same principle to hold a diode. This could be valuable in DC-powered circuits to prevent damage caused by reversed polarity of the DC-supply.
The present invention could be used in all electric or electronic equipment where some of its internal wiring is not protected by the overcurrent or short circuit protective devices fitted at the input power feed of the system or equipment. Examples of such systems are UPSs (Uninterruptible Power Supplies), variable speed drives, elevators, lifts, escalators, switchgear, industrial automation, traction applications, power plants, etc.
In case of a resistor being used to act as protective impedance, and if such impedance is properly selected, its failure is not probable. Under such conditions the resistor and the suitable connector could be directly integrated into one component of the holder assembly to be attached directly to the energized circuit as described above.
As a failure of the resistor element is unlikely, the cost of a separate multi-piece resistor holder could be avoided by integrating everything into a one-piece component.
The present invention has the following advantages: it allows removing practically all unprotected wiring from electric or electronic equipment; it can be designed to provide fuse protection or protective impedance to protect such wires; it can use assembly locations already existing in the system (e.g. bolt heads, busbars); it usually does not require additional real estate within the equipment (depth excluded).
REFERENCE NUMERALS AND ABBREVIATIONS
10 holder assembly for an electric fuse
10' holder assembly for an electric fuse
10" ho lder assembly for an electric fuse
10" ' ho lder assembly for an electric fuse
10"" ho lder assembly for an electric fuse
12 base part of the holder assembly 10
12' base part of the holder assembly 10')
12" base part of the holder assembly 10")
14 first conductive portion of the base part 12
14' screw body (first conductive portion of the base part 12')
14" ' screw body (first conductive portion of the base part 12")
16 energized screw of a high current busbar comprising a threaded hole 16' energized screw of a high current busbar
18 second conductive portion of the base part 12
18' screw head (second conductive portion of the base part 12')
18" screw head (second conductive portion of the base part 12") 18" ' second conductive portion of the base part 12
20 thread of the second conductive portion 18
20' thread of the middle portion 32'
20 ' ' thread of the middle portion 32 "
22 insulating cap of the holder assembly 10
22' insulating cap of the holder assembly 10
23 space under the insulating cap 22 for receiving the electric fuse 16
24 wire connector
25 small gauge or sense wire
26 electric fuse
26' electric fuse
28 thread of the first conductive portion 14
30 threaded hole for screwing in the first conductive portion 14
32 middle portion of the base part 12
32' plug (middle portion of the base part 12')
32" plug (middle portion of the base part 12")
32" ' middle portion of the base part 12
33 boreho le wall o f the p lug 32 '
33' borehole wall of the plug 32"
34 metal coil spring
36 first contact portion of the electric fuse
36' first contact portion of the electric fuse
38 mounting plate for holder assembly 10
40 threaded bore for screwing in the first conductive portion
42 bore for receiving the energized screw 16' of a high current bus bar

Claims

1. An electric protective element holder assembly (10) comprising a base part (12) having a first conductive portion (14) for attaching the assembly to an electrically energized part (16) of an electric circuitry and a second conductive portion (18), wherein the first and second conductive portions are electrically connected to each other, and a hollow, insulating part (22) having a wire connector (24) and means for attaching it to the second conductive portion of the base part, wherein the hollow, insulating part forms a holder for the electric protective element (26) such that the second conductive portion of the base part is electrically connected over the protective element to the wire connector when the hollow part is attached to the second portion of the base part.
2. The assembly of claim 1, wherein the second conductive portion (18) of the base part (12) comprises a thread (20) and the means for attaching the hollow, insulating part (22) to the second conductive portion (18) comprise a thread for screwing it on the thread of the second conductive portion.
3. The assembly of claim 1, wherein the means for attaching the hollow, insulating part to the second conductive portion comprise a bayonet coupling.
4. The assembly of claim 1, 2 or 3, wherein the first conductive portion comprises a thread (28) for screwing it in a threaded hole (30) of the electrically energized part of the electric circuitry.
5. The assembly of claim 1, 2, 3 or 4, wherein the base part comprises a middle portion (32) with the first and the second portions being provided on opposite sides of the middle portion.
6. The assembly of claim 5, wherein the middle portion is made of an insulating material enclosing a conductive portion electrically connecting the first conductive portion with the second conductive portion.
7. The assembly of claim 5, wherein the middle portion is made of metal, particularly brass, which electrically connects the first conductive portion with the second conductive portion.
8. The assembly of any of the preceding claims, wherein a conductive spring element (34) is positioned within the hollow, insulating part between the resistive element and the wire connector such that an electrical contact (36) of the resistive element is pressed on the second conductive portion to electrically contact the resistive element with the first conductive portion.
9. The assembly of any of the preceding claims further comprising a mounting plate (38) having first fixation means (40) for fixing the first conductive portion on the mounting plate and second fixation means (42) for attaching the assembly to the electrically energized part of the electric circuitry.
10. The assembly of claim 9, wherein the mounting plate is formed as an integral part of the base part.
11. The assembly of claim 9, wherein the mounting plate is formed as a separate entity.
12. The assembly of any of the preceding claims, wherein the protective element is a fuse, a resistor, particularly a PTC resistor, or a diode.
13. The assembly of any of the preceding claims, wherein the hollow, insulating part and the protective element are formed as an integral component.
14. The assembly of any of the preceding claims, wherein the hollow, insulating part and the protective element are integrated in a standard screw head comprising also the second conductive portion.
PCT/EP2015/079196 2014-12-18 2015-12-10 An electric protective element holder assembly WO2016096587A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB201422543 2014-12-18
GB1422543.7 2014-12-18

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US20090066469A1 (en) * 2007-09-10 2009-03-12 Naeem Rahman Battery fuse assembly
KR20100003533A (en) * 2008-07-01 2010-01-11 현대자동차주식회사 Fuse and bolt assembly including the same

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GB1246423A (en) * 1970-04-23 1971-09-15 Hego Electric Gmbh Fuse cartridge holder
JPH08287816A (en) * 1995-04-10 1996-11-01 Tokin Corp Fuse holder
US6162098A (en) * 2000-02-02 2000-12-19 Cheng; Wen Tzung Modified connector for car battery
US20090066469A1 (en) * 2007-09-10 2009-03-12 Naeem Rahman Battery fuse assembly
KR20100003533A (en) * 2008-07-01 2010-01-11 현대자동차주식회사 Fuse and bolt assembly including the same

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