EP0201714A2 - Cartouche à fusible à basse tension-grande puissance comportant un indicateur de fusion - Google Patents

Cartouche à fusible à basse tension-grande puissance comportant un indicateur de fusion Download PDF

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Publication number
EP0201714A2
EP0201714A2 EP86104722A EP86104722A EP0201714A2 EP 0201714 A2 EP0201714 A2 EP 0201714A2 EP 86104722 A EP86104722 A EP 86104722A EP 86104722 A EP86104722 A EP 86104722A EP 0201714 A2 EP0201714 A2 EP 0201714A2
Authority
EP
European Patent Office
Prior art keywords
plate
indicator
fuse link
fuse
contact
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP86104722A
Other languages
German (de)
English (en)
Other versions
EP0201714A3 (en
EP0201714B1 (fr
Inventor
Hajo Dipl.-Ing. Lindner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lindner Fabrik Elektrischer Lampen und Apparate GmbH
Original Assignee
Lindner Fabrik Elektrischer Lampen und Apparate GmbH
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 Lindner Fabrik Elektrischer Lampen und Apparate GmbH filed Critical Lindner Fabrik Elektrischer Lampen und Apparate GmbH
Priority to AT86104722T priority Critical patent/ATE53704T1/de
Publication of EP0201714A2 publication Critical patent/EP0201714A2/fr
Publication of EP0201714A3 publication Critical patent/EP0201714A3/de
Application granted granted Critical
Publication of EP0201714B1 publication Critical patent/EP0201714B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/30—Means for indicating condition of fuse structurally associated with the fuse
    • H01H85/303—Movable indicating elements

Definitions

  • the invention relates to a NH fuse link with the features of the preamble of claim 1.
  • NH fuses are used for short-circuit and overcurrent protection of low-voltage, high-performance circuits. They are used in so-called NH fuse bases, which are usually strung together like a control panel.
  • the grip tabs of NH fuse links are increasingly insulated and the front cover plates are no longer made from a metallic material but from an insulating material.
  • Another measure for all-round protection against unintentional contact with live parts is the installation of contact protection covers for the contacts of the NH fuse-bases and disconnectors. In normal operating conditions, live parts can no longer be touched with an IEC test finger. Likewise, accidental touching of such components by a technician is largely ruled out. So far, however, the possibility has not been taken into account that the indicator can still be live even when triggered.
  • the indicators which are generally attached to an end face of an NH fuse link, essentially represent a parallel current branch to the fuse fuse connected via the contact blades.
  • the leaf spring type is attached at the end ge indicator plate electrically connected to a contact knife at its fastening end.
  • the sheet In the normal state of the fuse link, the sheet is held by the indicator wire by acting against its spring force in approximately parallel contact with the end plate forming the end face.
  • the second end of the indicator wire is in electrical connection with the opposite contact knife.
  • the full current flows through the indicator wire after the fuse element has been cut and also causes it to melt.
  • the leaf spring-like biased free end of the indicator plate is thereby released and protrudes from the end plate clearly visible when released. Since there is still a conductive connection between the fastening end of the indicator plate and the associated contact knife, the full mains voltage is present on the plate if this contact knife was inserted into the NH fuse base on the mains side. The associated risk of accident is obvious.
  • NH fuse-links are already known in which the indicator device has no external live parts.
  • An example here is a construction in which a detector wire contacted via an inner sheet metal acts in the normal state against the spring force of a coil spring on a longitudinally displaceable detector stamp made of insulating material and arranged within the insulating housing. After melting of the wire of the characteristic detector stamp is released and displaced by the spring outwardly and enters' apparent from the insulating forth.
  • This solution is structurally very complex and requires more components. Solutions are also known in which the indicator plate, which may be live, is covered by transparent caps or insulating coverings. However, such indicator devices are generally technically far more complex and inefficient to manufacture. It has also not been clarified whether a cover cap protruding from the end plate complies with the existing national and international measurement standards.
  • the present invention has for its object to provide an NH fuse link, which is equipped with a reliably working, rationally producible and in the tripped state voltage-free indicator device.
  • This object is achieved in accordance with the characterizing features of claim 1.
  • the fastening end of the indicator plate is namely - unlike conventional NH fuse links - insulated in the end plate and the contact is made in the normal state via its free end. If the indicator wire melts in the event of a fault, the free end of the spring-loaded indicator plate is released and lifts off the live part - for example the contact knife. It is therefore free of tension.
  • the indicator device according to the invention therefore does not require any further components or the like for covering live parts. and is very simple in its construction.
  • the construction of the indicator device according to the invention is also implemented on NH fuse-links of other types can be.
  • a fuse link made of two half-shells, for example, is also suitable for installing the indicator device.
  • Claim 2 describes a preferred embodiment of the subject matter of the invention, in which the contact point between the contact knife and the indicator plate is located at a point which can be seen from the outside. This makes it possible to visually check whether the identification device has actually been contacted during the manufacture of the NH fuse link. This improves the reliability of the end product.
  • the position of the fastening end in the edge area of the end plate on the side of the handle tab makes use of the entire available space between the contact knife and the handle tab.
  • the indicator plate can therefore be made large and easily visible from the outside.
  • the indicator plate In the manufacture of the NH fuse link according to the invention, the indicator plate is placed with its fastening end in the corresponding holder and brought into its end plate parallel position by pulling on the indicator wire. The free end of the indicator plate slides onto the edge of the contact knife on the handle tab. The traction forces required for this are reduced by the free end of the indicator plate rolled over according to claim 3. This also largely prevents the free end from getting caught on unevenness in the contact knife surface.
  • Another advantage of this construction according to the invention is the possibility that certain positional tolerances of the contact knife and length tolerances of the sheet itself can be compensated for automatically by the rolled free end.
  • the characteristic feature of claim 4 increases the contact pressure between the indicator plate and the contact knife, since an additional force component perpendicular to the surface of the contact knife is generated when the sheet metal strip is preloaded in a circular arc by means of the indicator wire.
  • the free end of the indicator plate on the end plate slides in the direction of the contact knife until it touches it.
  • the rolled free end has a positive effect because this prevents the free end from getting caught on unevenness in the end plate.
  • Another advantage of the pre-tensioning of the indicator plate is the improved contact separation, since the plate also shortens after being released for lifting.
  • the characterizing features of claim 6 describe an advantageously simple attachment of the indicator plate in the corresponding end plate. Its barb-like bent end is inserted into a recess in the end plate. The hook end preferably snaps behind a projection located in the recess and is thereby held captive. The manufacturing step of fastening the indicator plate is therefore exhausted by simply inserting the fastening end into the recess in the end plate.
  • claims 7 and 8 relate to two alternative ways of protecting the indicator plate which is live in the normal state against unintentional contact. For this purpose, it can be arranged over its entire length in a recess in the end plate. This should then be made thicker. The associated additional material expenditure is avoided by training according to claim 8.
  • the locking protrusion protruding approximately at right angles from the end plate between the grip tab and the fastening end of the indicator plate reduces the free space between the end plate and the opposing contact protection cover of the lower part of the NH fuse to a degree that gives access to the live indicator plate with an IEC test finger or the like. makes impossible. It is sufficient that the locking projection has approximately the width of the indicator plate according to claim 9.
  • Claim 10 teaches a further measure to improve the contact between the live part and the indicator plate.
  • irregularities in shape and dimensions for example of the contact knife, can be better compensated for by different bending of the two metal flags that are now present . Due to the great flexibility, an enlarged contact area can also be created if necessary.
  • the slot creates a simple attachment option for the free end of the indicator wire, which is attached to the slot with a thickening.
  • the NH fuse link 1 consists of a sleeve-like insulating body 2, which is closed at the end by two end plates 3 made of insulating material. These each fix an approximately U-shaped holding plate 4 for the contact blades 5, which are guided through two openings 6 to the outside.
  • the insulating body 2 In its edge area, the insulating body 2 has two recesses 7 (one of which can be seen in the sectional view), in each of which one leg of the L-shaped tabs 8 is inserted.
  • the grip tabs 8 are also fixed in position by the end plates 3 and are kept stress-free by the construction shown in the figures.
  • the fusible conductor 9 (shown schematically) serves as the connection between the two contact blades 5.
  • the indicator device consisting of indicator plate 10 and indicator wire 11, is located electrically parallel to this current path In the normal state of the fuse link 1 (FIG. 1), the plate is from the indicator wire 11 held against the spring force in approximately parallel contact with the end plate 3. The contacting of the indicator device takes place via the rolled-over free end 12 of the indicator plate 10, which in the normal state rests on the edge 13 of the contact knife 5 on the handle tab side.
  • the tensioned indicator wire 11 runs approximately parallel to the fuse element 9 to the opposite end plate 3 and is electrically connected there to the second contact knife 5, the indicator device is therefore electrically parallel to the fuse element 9.
  • fuse element 9 and indicator wire 11 melt one after the other. This releases the free end 12 of the indicator plate 10, which then assumes the position shown in FIG. 3. Due to its clear protrusion from the end plate 3, the release state of the fuse link is indicated, at the same time the indicator plate 10 is coupled to any live parts, that is to say no voltage.
  • the fastening end 14 of the indicator plate 10 has the barb-like bend 15 which lies in the recess 16 arranged in the edge area of the end plate 3 on the handle tab.
  • the hook end 17 engages behind the projection 18 located in the recess 16, as a result of which the fastening end 14 of the indicator plate 10 can be snapped in during manufacture and is captively fixed there. Since the end plate 3 is made of insulating material, the absence of voltage in the indicator plate is also ensured here.
  • connection point between the indicator wire 11 and the indicator plate 10 is arranged approximately in the central area thereof. In the normal state, the through is below guide opening 19 for the indicator wire 11. Since the connection between the two components of the indicator device can only be stressed in the direction of the fuse interior, it is sufficient to provide the free end of the indicator wire 11 with a thickening 20 and the wire through a hole (not shown) to pull in the indicator plate 10.
  • the indicator plate 10 has the slot 22 extending from its free end 12, which ends approximately in its central region.
  • the locking projection 23 projecting approximately at right angles from the end plate 3 is arranged. It is preferably integrally formed on the end plate 3. Its width corresponds approximately to that of the indicator plate 10.
  • FIG. 5 shows the alternative contacting method in which the indicator plate 10 is put under tension via the holding plate 4.
  • a continuous opening 24 is provided in the end plate 3 in the region of the free end 12 of the indicator plate 10, which is penetrated by the free end 12 of the plate bent in the direction of the fuse interior. In the normal state, this free end 12 bears on the holding plate 4, the electrical contact between the contact knife 5 and the indicator device is created.

Landscapes

  • Fuses (AREA)
  • Glass Compositions (AREA)
  • External Artificial Organs (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
EP86104722A 1985-05-11 1986-04-07 Cartouche à fusible à basse tension-grande puissance comportant un indicateur de fusion Expired - Lifetime EP0201714B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86104722T ATE53704T1 (de) 1985-05-11 1986-04-07 Nh-sicherungseinsatz mit sicherheitskennmelder.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3517038 1985-05-11
DE19853517038 DE3517038A1 (de) 1985-05-11 1985-05-11 Nh-sicherungseinsatz mit sicherheitskennmelder

Publications (3)

Publication Number Publication Date
EP0201714A2 true EP0201714A2 (fr) 1986-11-20
EP0201714A3 EP0201714A3 (en) 1989-03-22
EP0201714B1 EP0201714B1 (fr) 1990-06-13

Family

ID=6270493

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86104722A Expired - Lifetime EP0201714B1 (fr) 1985-05-11 1986-04-07 Cartouche à fusible à basse tension-grande puissance comportant un indicateur de fusion

Country Status (3)

Country Link
EP (1) EP0201714B1 (fr)
AT (1) ATE53704T1 (fr)
DE (2) DE3517038A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998007172A1 (fr) * 1996-08-08 1998-02-19 Siemens Aktiengesellschaft Liaison fusible
CZ299300B6 (cs) * 2004-11-10 2008-06-11 Oez S. R. O. Pojistková vložka elektrické tavné pojistky s duální indikací provozního stavu
CZ300923B6 (cs) * 2002-03-25 2009-09-09 Oez S.R.O. Kontakt nožové pojistky a zpusob jeho výroby
WO2011114176A1 (fr) 2010-03-18 2011-09-22 Kopcic Nikola Indicateur d'état de liaison fusible pour fusible basse tension, haute puissance

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD559203S1 (en) 2006-11-14 2008-01-08 Littelfuse, Inc. Indicator for a fuse

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7528974U (de) * 1975-09-12 1976-01-08 Siemens Ag, 1000 Berlin Und 8000 Muenchen Niederspannungs-Hochleistungs-Sicherung mit einer Anzeigevorrichtung
DE2932584A1 (de) * 1979-08-10 1981-02-26 Siemens Ag Nh-sicherung mit isolierten grifflaschen
DE3034762A1 (de) * 1980-09-15 1982-03-25 Siemens AG, 1000 Berlin und 8000 München Sicherungseinsatz und verfahren zu seiner herstellung
DE3203211C2 (de) * 1982-02-01 1986-05-15 Siemens AG, 1000 Berlin und 8000 München Sicherungseinsatz, insbesondere für NH-Sicherungen

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998007172A1 (fr) * 1996-08-08 1998-02-19 Siemens Aktiengesellschaft Liaison fusible
CZ300923B6 (cs) * 2002-03-25 2009-09-09 Oez S.R.O. Kontakt nožové pojistky a zpusob jeho výroby
CZ299300B6 (cs) * 2004-11-10 2008-06-11 Oez S. R. O. Pojistková vložka elektrické tavné pojistky s duální indikací provozního stavu
WO2011114176A1 (fr) 2010-03-18 2011-09-22 Kopcic Nikola Indicateur d'état de liaison fusible pour fusible basse tension, haute puissance
US20130002393A1 (en) * 2010-03-18 2013-01-03 Nikola Kopcic Fuse link status indicator for a low-voltage high-power fuse

Also Published As

Publication number Publication date
EP0201714A3 (en) 1989-03-22
DE3517038A1 (de) 1986-11-13
DE3672021D1 (de) 1990-07-19
EP0201714B1 (fr) 1990-06-13
ATE53704T1 (de) 1990-06-15

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