EP0201714B1 - 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
EP0201714B1
EP0201714B1 EP86104722A EP86104722A EP0201714B1 EP 0201714 B1 EP0201714 B1 EP 0201714B1 EP 86104722 A EP86104722 A EP 86104722A EP 86104722 A EP86104722 A EP 86104722A EP 0201714 B1 EP0201714 B1 EP 0201714B1
Authority
EP
European Patent Office
Prior art keywords
indicator
fuse
plate
link
free end
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.)
Expired - Lifetime
Application number
EP86104722A
Other languages
German (de)
English (en)
Other versions
EP0201714A3 (en
EP0201714A2 (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 being 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.
  • a typical representative of such a NH fuse link - but still with live grip tabs - is known for example from DE-A-32 03 211.
  • the indicator device with indicator wire and with an indicator usually attached to an end face of the NH fuse link represents a parallel current branch to the fuse link connected via the contact blades.
  • the leaf spring-type indicator plate which is fastened at the end, is mounted at its fastening end on one of the end plates and electrically with one Contact knife connected.
  • 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 abutment on the end plate forming the end face.
  • the second end of the indicator wire is in electrical connection with the opposite contact knife. In the event of an overload or short circuit in the protected circuit, the full current flows through the indicator wire after the fuse wire has been cut and also melts it.
  • 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 applied to the plate if this contact knife was inserted into the NH fuse base on the mains side. The associated risk of accidents is obvious.
  • an NH fuse link is also known, in which the fastening end of the indicator plate is insulated in one end face of the insulating body thereof.
  • the free end of the indicator plate which protrudes from the end face when triggered is connected to the indicator wire, if necessary, in one piece.
  • the electrical connection of the indicator wire takes place in that it is guided in the area of its indicator plate-side end over the corresponding holding plate for the one contact blade of the fuse link. After cutting the indicator wire in the release state, the free end of the indicator plate protrudes from the front of the fuse link, but the remaining section of the indicator wire hanging on the indicator plate can still be in electrical connection with the corresponding holding plate for the one contact knife.
  • 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 the wire has melted, the indicator stamp is released and pushed outwards by the spring. It therefore clearly emerges from the insulating housing.
  • This solution is structurally very complex and requires a large number of components.
  • the present invention has for its object to provide a NH fuse link, which is equipped with a structurally simple, but reliably responsive, rationally producible and in the release state with the greatest possible security 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 kept insulated in the end plate and the contact - in contrast to conventional NH fuse links - 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 can also be implemented on NH fuse-links of other types.
  • 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 contacting point between the contact knife and the indicator plate is located at a point which is visible 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 handle tab makes use of the entire space available 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 design 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 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 with the flat pulling of the sheet metal strip that is pre-tensioned in a circular arc.
  • 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 NH fuse-lower part 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 region, the insulating body 2 has two recesses 7 (one of which can be seen in the sectional view), into 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 is.
  • the sheet In the normal state of the fuse link 1 (FIG. 1), the sheet is held by the indicator wire 11 by acting against its 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.
  • 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, there is the lead-through opening 19 for the indicator wire 11. Since the connection between the two components of the indicator device must only be able to withstand tension in the direction of the interior of the fuse, it is sufficient to provide the free end of the indicator wire 11 with a thickening 20 and the wire by a Pull the hole (not shown) 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.
  • 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)

Claims (10)

1. Cartouche de coupe-circuit basse tension à haut pouvoir de coupure (1) comprenant:
un corps isolant (2) semblable à un manchon,
deux plaques terminales (3) en matériau isolant, qui ferment les extrémités de ce corps et fixent des plaques de maintien (4) de lames de contact (5),
deux pattes de préhension (8) qui sont chacune maintenues, hors tension, entre une plaque terminale (3) et le corps isolant (2), et
un dispositif indicateur pour indiquer l'état déclenché de la cartouche (1) et qui est constitué d'un fil indicateur (11) connecté électriquement en parallèle avec le conducteur fusible (9) et d'une lamelle indicatrice (10) en tôle, semblable à un ressortlame et reliée électriquement et mécaniquement à une extrémité de ce fil (11), la lamelle (10) étant
fixée par une extrémité à l'une des plaques terminales (3), maintenue appliquée, à l'état normal de la cartouche, contre la plaque terminale (3), en étant orientée à peu près parallèlement à celle-ci, par le fil indicateur (11), lequel agit sur la lamelle à l'encontre de la force élastique de celle-ci,
dont l'extrémité fixée (14) est maintenue isolée dans la plaque terminale (3) et
dont l'extrémité libre (12) dépasse de la plaque terminale (3) à l'état déclenché de la cartouche (1 ), après la fusion de son conducteur fusible (9) et du fil indicateur (11),

caractérisée en ce
que le fil indicateur (11) est exclusivement relié électriquement à la lamelle indicatrice (10) à son extrémité côté lamelle et que, pour le raccordement électrique du fil indicateur (11), l'extrémité libre (12) de la lamelle (10) est appliquée, à l'état normal de la cartouche, contre une pièce sous tension (lame de contact 5, plaque de maintien 4).
2. Cartouche selon la revendication 1, caractérisée en ce que l'extrémité libre (12) de la lamelle indicatrice (10) est appliquée, à l'état normal, contre le bord (13) côté patte de préhension de la lame de contact (5) et son extrémité fixée (14) est supportée dans la zone du bord de la plaque terminale (3) du côté de la patte de préhension.
3. Cartouche selon la revendication 1 ou 2, caractérisée en ce que l'extrémité libre (12) de la lamelle (10) est recourbée pour s'appliquer tangentiellement contre une pièce sous tension (lame de contact 5, plaque de maintien 4).
4. Cartouche selon la revendication 2 ou 3, caractérisée en ce que la zone centrale de la lamelle (10) est précontrainte de manière à avoir une forme en arc de cercle (forme précontrainte 21
5. Cartouche selon la revendication 1 ou 3, caractérisée en ce que la plaque terminale (3) présente une ouverture (24) dans la zone de l'extrémité libre de la lamelle (10), ouverture qui est traversée, à l'état normal, par une extrémité libre (12) de la lamelle (10) qui est courbée à peu près à angle droit vers l'intérieur et est appliquée, à travers cette ouverture, contre la plaque de maintien (4), sous tension, pour la lame de contact (5).
6. Cartouche selon une des revendications précédentes, caractérisée en ce que l'extrémité fixée (14) de la lamelle (10) est courbée en crochet et est glissée dans un évidement (16) de la plaque terminale (3), de manière que l'extrémité crochue (17) vienne se placer, dans cet évidement (16), derrière une saillie (18) située en face d'elle.
7. Cartouche selon une des revendications précédentes, caractérisée en ce que la lamelle (10) est disposée sur toute sa longueur dans un creux de la plaque terminale (3).
8. Cartouche selon une des revendications 1 à 6, caractérisée en ce que la plaque terminale (3) présente, entre la patte de préhension (8) et l'extrémité fixée (14) de la lamelle (10), une saillie (23) de blocage ou de fermeture dépassant à peu près à angle droit de la plaque.
9. Cartouche selon la revendication 8, caractérisée en ce que la saillie de blocage (23) possède à peu près la largeur de la lamelle (10).
10. Cartouche selon une des revendications précédentes, caractérisée en ce que la lamelle (10) présente une fente (22) s'étendant à peu près dans le sens de la longueur depuis son extrémité libre (12) jusque dans la zone centrale.
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 EP0201714A2 (fr) 1986-11-20
EP0201714A3 EP0201714A3 (en) 1989-03-22
EP0201714B1 true 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 (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

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ287833B6 (en) * 1996-08-08 2001-02-14 Siemens Ag Fuse carrier
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
HRP20100161A2 (hr) * 2010-03-18 2011-09-30 Kopčić Nikola Indikator stanja rastalnice uloška niskonaponskih visokoučinskih osigurača

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 (4)

* 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
USD577688S1 (en) 2006-11-14 2008-09-30 Littelfuse, Inc. Indicator for a fuse
USD577687S1 (en) 2006-11-14 2008-09-30 Littelfuse, Inc. Indicator for a fuse
USD581881S1 (en) 2006-11-14 2008-12-02 Littelfuse, Inc. Indicator for a fuse

Also Published As

Publication number Publication date
EP0201714A3 (en) 1989-03-22
DE3517038A1 (de) 1986-11-13
DE3672021D1 (de) 1990-07-19
ATE53704T1 (de) 1990-06-15
EP0201714A2 (fr) 1986-11-20

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