EP0213404A1 - Cartridge fuse with a spring blade indicator - Google Patents

Cartridge fuse with a spring blade indicator Download PDF

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Publication number
EP0213404A1
EP0213404A1 EP86110558A EP86110558A EP0213404A1 EP 0213404 A1 EP0213404 A1 EP 0213404A1 EP 86110558 A EP86110558 A EP 86110558A EP 86110558 A EP86110558 A EP 86110558A EP 0213404 A1 EP0213404 A1 EP 0213404A1
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EP
European Patent Office
Prior art keywords
fuse
spring
indicator
indicating
end plate
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
EP86110558A
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German (de)
French (fr)
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EP0213404B1 (en
Inventor
Walter Dipl.-Ing. Biller (Fh)
Albert Seger
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.)
Siemens AG
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Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to AT86110558T priority Critical patent/ATE61695T1/en
Publication of EP0213404A1 publication Critical patent/EP0213404A1/en
Application granted granted Critical
Publication of EP0213404B1 publication Critical patent/EP0213404B1/en
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 fuse link, in particular for low-voltage high-performance fuses, called NH fuses, according to the preamble of claim 1.
  • the fuse link between contact blades has a working fuse and, electrically in parallel with it, an indicator fuse with spring plate indicator.
  • the indicator fuse is stretched between an indicator spring on one end plate and the opposite end plate, it holds down the free end of the indicator spring. If the fuse element melts, the indicator spring can spring open from the end plate and give a visual indication.
  • a fuse link is known (DE-OS 32 03 211).
  • the display fuse element is threaded through a relatively wide opening for filling in extinguishing sand and through a small opening in the opposite end plate with a cannula.
  • This cannula is centered by a funnel-shaped expansion of the passage opening.
  • Such a centering makes it possible to thread the display fuse element through the small passage opening, the diameter of which in practice is kept below 0.35 mm.
  • fuse links with a display fuse element of the type described it can occur in practice that the display fuse element is held in place by grains of sand that jam in the start-up funnel or in the small passage hole, so that the indicator fuse element cannot release the spring plate indicator when activated. It has also sometimes happened that the fuse element has been welded to the live end plate.
  • the invention has for its object to develop a fuse link, the indicator on the principle of a spring plate indicator is insusceptible to the disturbances described.
  • the fuse element is guided through a grommet-shaped sheath which is inserted through the end plate, between the fuse element and the um cover must also be provided for electrical insulation (DE-GM 76 12 790).
  • special molded parts are unnecessary and assembly is facilitated.
  • Fuse inserts on the market if they have a sealing layer, have a wide opening in the area of the passage opening, so that the quenching sand can fill the funnel-shaped run-up.
  • a funnel-shaped start-up of the passage opening is unnecessary if, during assembly, for example, a guide tube is used to ensure that the cannula for threading the fuse element meets the passage opening.
  • the sealing layer can, however, also be designed such that when the cannula is moved sideways to seek the passage opening, the material rests so far that extinguishing sand cannot pass through.
  • the indicator spring on the end plate pretrude beyond the edge of the opening for the display fuse element in order to keep the indicator fuse element fixed on the outside of the end plate free in the passage opening against its wall. This ensures particularly well that the fuse element cannot weld to the end plate. This is already made difficult by the sealing layer.
  • fuse link makes it possible to cover the passage opening for the display fuse element in relation to its diameter over a wide area to train, which on the one hand facilitates threading and on the other hand ensures the function of the fuse element to an even greater extent.
  • the fuse link according to FIG. 1 has a working fuse 3 between contact blades 1, 2. Above and electrically parallel to this, a display fuse element 4 with a spring plate indicator is arranged. The display fuse element 4 is stretched between an end plate 6 and the opposite end plate 7, the free end of the indicator spring 5 being held down. When the fuse element 4 melts, the indicator spring 5 can spring open from the end plate 6 and give a visual display.
  • the end plate 6 with the indicator spring 5 is provided on its inside with a sealing layer 14, which may consist of an asbestos replacement material. A paper-like material can also be used.
  • This sealing layer can be pierced in the assembly by a pointed cannula 20 in a guide tube 8 according to FIG. 5 in order to thread the display fuse element 4 through the end plate 6 into its passage opening 9.
  • the sealing layer 14 extends closer than the amount of the grain diameter of the sand to the display fuse element 4.
  • the contact blades 1, 2 are held with their flanges 11 in an insulating material housing 10, for example made of ceramic.
  • the spring 5 of the indicator spring 5 can be matched to the fuse element 4 according to FIG. 2 by a notch 12.
  • the display fuse element can be flipped behind the passage opening 9 in the end plate 6 and welded in order to hold down the display spring 5.
  • the display fuse element 4 passes through an opening 13 in the display spring 5.
  • the end plates 6 and 7 can be clamped according to Figure 1 by screws 15 on the housing of the fuse link.
  • the fuse element 4 is fixed by the closure 16 of the filling opening for sand and is connected to a contact plate 17 according to FIG.
  • the indicator spring 5 and the contact plate 17 ride on the contact blades 2 and 1, respectively.
  • the indicator spring 5 and the contact plate 17 are fastened by knobs 18. It is advantageous if the indicator spring 5 on the end plate 6 over the edge of the passage opening for the display melt conductor 4 is formed above, as illustrated in Figure 4. As a result, the display fuse element is guided freely in the passage opening 9.
  • the piercing opening 19 in the sealing layer 14 is illustrated in the drawing with an exaggerated diameter.
  • the passage opening 9 for the display fuse element 4 can be designed to be spacious relative to its diameter, since the extinguishing sand of the fuse link is prevented from the passage opening 9 in the end plate by the sealing layer 14.

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  • Fuses (AREA)
  • Pens And Brushes (AREA)
  • Springs (AREA)
  • Helmets And Other Head Coverings (AREA)

Abstract

The invention relates to a cartridge fuse, particularly for low-voltage, high-rupture capacity fuses, known as hrc fuses, which has an operating fusing conductor (3) between contact blades (1, 2) and above it, and connected electrically in parallel with it, an indicating fusing conductor (4) having a spring plate indicator, an indicating fusing conductor (4) being clamped between an indicating spring (5) on a stop plate (6) and the stop plate (7) located opposite, which indicating fusing conductor (4) holds the free end of the indicating spring (5) down, which springs up from the stop plate (6) after melting of the indicating fusing conductor (4) and provides an optical indication. It is intended that the stop plate (6) with the indicating spring (5) be provided with a sealing layer (14) on its inner side, which can be penetrated by a channel (7) and, in the region of the passage opening (9) in the cover plate, reaches up closer to the indicating fusing conductor (4) than it corresponds to the grain diameter of the extinguishing sand. <IMAGE>

Description

Die Erfindung bezieht sich auf einen Sicherungseinsatz, insbesondere für Niederspannungs-Hochleistungs-Sicherun­gen, NH-Sicherungen genannt, nach Oberbegriff von Patent­anspruch 1. Danach weist der Sicherungseinsatz zwischen Kontaktmessern einen Arbeitsschmelzleiter und darüber, elektrisch parallel hierzu, einen Anzeigeschmelzleiter mit Federblechanzeiger auf. Der Anzeigeschmelzleiter ist zwischen einer Anzeigefeder an einer Abschlußplatte und der gegenüberliegenden Abschlußplatte gespannt, er hält das freie Ende der Anzeigefeder nieder. Wenn der Anzeige­schmelzleiter durchschmilzt, kann die Anzeigefeder von der Abschlußplatte auffedern und eine optische Anzeige geben. Ein derartiger Sicherungseinsatz ist bekannt (DE-OS 32 03 211).The invention relates to a fuse link, in particular for low-voltage high-performance fuses, called NH fuses, according to the preamble of claim 1. Thereafter, the fuse link between contact blades has a working fuse and, electrically in parallel with it, an indicator fuse with spring plate indicator. The indicator fuse is stretched between an indicator spring on one end plate and the opposite end plate, it holds down the free end of the indicator spring. If the fuse element melts, the indicator spring can spring open from the end plate and give a visual indication. Such a fuse link is known (DE-OS 32 03 211).

Bei den verschiedenartigen auf dem Markt befindlichen Sicherungseinsätzen mit Anzeigevorrichtungen wird der Anzeigeschmelzleiter durch eine verhältnismäßig weite Öffnung zum Einfüllen von Löschsand und durch eine klei­ne Öffnung in der gegenüberliegenden Abschlußplatine mit einer Kanüle hindurchgefädelt. Diese Kanüle wird durch eine trichterförmige Erweiterung der Durchtritts­öffnung zentriert. Eine solche Zentrierung ermöglicht es, den Anzeigeschmelzleiter durch die kleingehaltene Durchtrittsöffnung, deren Durchmesser in der Praxis unterhalb 0,35 mm gehalten wird, hindurchzufädeln. Durch ihre kleine Durchtrittsöffnung will man vermeiden, daß Löschsand verloren wird und auch verhindern, daß beim Abschalten ein Lichtbogen austreten kann.With the various fuse inserts with display devices on the market, the display fuse element is threaded through a relatively wide opening for filling in extinguishing sand and through a small opening in the opposite end plate with a cannula. This cannula is centered by a funnel-shaped expansion of the passage opening. Such a centering makes it possible to thread the display fuse element through the small passage opening, the diameter of which in practice is kept below 0.35 mm. With their small passage opening, one wants to avoid that extinguishing sand is lost and also prevent an arc from escaping when switched off.

Bei Sicherungseinsätzen mit einem Anzeigeschmelzleiter der geschilderten Art kann es in der Praxis vorkommen, daß der Anzeigeschmelzleiter durch Sandkörner, die sich im Anlauftrichter oder in dem kleinen Durchtrittsloch verklemmem, festgehalten wird, so daß der Anzeigeschmelz­leiter beim Ansprechen den Federblechanzeiger nicht frei­geben kann. Es ist mitunter auch vorgekommen, daß der Anzeigeschmelzleiter an der spannungsführenden Abschluß­platte festgeschweißt wurde.In fuse links with a display fuse element of the type described, it can occur in practice that the display fuse element is held in place by grains of sand that jam in the start-up funnel or in the small passage hole, so that the indicator fuse element cannot release the spring plate indicator when activated. It has also sometimes happened that the fuse element has been welded to the live end plate.

Der Erfindung liegt die Aufgabe zugrunde, einen Siche­rungseinsatz zu entwickeln, dessen Anzeiger nach dem Prinzip eines Federblechanzeigers gegen die geschilder­ten Störungen unanfällig ist.The invention has for its object to develop a fuse link, the indicator on the principle of a spring plate indicator is insusceptible to the disturbances described.

Die Lösung der geschilderten Aufgabe liegt nach der Er­findung in einem Sicherungseinsatz mit den Merkmalen nach dem kennzeichnenden Teil von Anspruch 1. Die Ab­schlußplatte mit der Anzeigefeder ist danach auf ihrer Innenseite durch eine Dichtung geschützt, durch die der Anzeigeschmelzleiter mit einer angespitzten Kanüle hin­durchgestochen und durch die Durchtrittsöffnung in der Abdeckplatte durchgefädelt werden kann. Eine solche Dich­tungsschicht läßt zum Anzeigeschmelzleiter in einem Ring­spalt nur einen kleineren Abstand als den Betrag des Korndurchmesser des Löschsandes. Falls an der Durchtritts­öffnung für den Anzeigeschmelzleiter ein trichterförmiger Anlauf ausgebildet ist, wird dieser Hohlraum durch die Dichtungsschicht gegen Löschsand abgedichtet.The solution to the problem described is according to the invention in a fuse link with the features according to the characterizing part of claim 1. The end plate with the indicator spring is then protected on the inside by a seal through which the fuse element is pierced with a pointed cannula and through which Passage opening can be threaded in the cover plate. Such a sealing layer leaves the display fusible conductor in an annular gap only a smaller distance than the amount of the grain diameter of the quenching sand. If a funnel-shaped run-up is formed at the passage opening for the display fuse element, this cavity is sealed against extinguishing sand by the sealing layer.

Bei einer bekannten Anzeigevorrichtung für Sicherungsein­sätze wird der Schmelzleiter durch eine tüllenförmige Um­hüllung geführt, die durch die Abschlußplatte hindurchge­steckt ist, wobei zwischen Anzeigeschmelzleiter und Um­ hüllung zusätzlich für eine elektrische Isolierung zu sorgen ist (DE-GM 76 12 790). Beim erfindungsgemäßen Sicherungseinsatz erübrigen sich besondere Formteile und die Montage wird erleichtert.In a known display device for fuse links, the fuse element is guided through a grommet-shaped sheath which is inserted through the end plate, between the fuse element and the um cover must also be provided for electrical insulation (DE-GM 76 12 790). In the fuse link according to the invention, special molded parts are unnecessary and assembly is facilitated.

Auf dem Markt befindliche Sicherungseinsätze weisen, wenn sie eine Dichtungsschicht haben, im Bereich der Durchtrittsöffnung eine weitgehaltene Ausnehmung auf, so daß der Löschsand den trichterförmigen Anlauf aus­füllen kann. Bei einem erfindungsgemäßen Sicherungsein­satz erübrigt sich ein trichterförmiger Anlauf der Durchtrittsöffnung, wenn man in der Montage beispiels­weise durch ein Führungsrohr dafür sorgt, daß die Kanüle zum Einfädeln des Anzeigeschmelzleiters die Durchtritts­öffnung trifft. Die Dichtungsschicht kann aber auch so ausgebildet sein, daß bei einer Seitbewegung der Kanüle, um die Durchtrittsöffnung zu suchen, sich das Material soweit wieder anlegt, daß Löschsand nicht hindurchtreten kann.Fuse inserts on the market, if they have a sealing layer, have a wide opening in the area of the passage opening, so that the quenching sand can fill the funnel-shaped run-up. In the case of a fuse link according to the invention, a funnel-shaped start-up of the passage opening is unnecessary if, during assembly, for example, a guide tube is used to ensure that the cannula for threading the fuse element meets the passage opening. The sealing layer can, however, also be designed such that when the cannula is moved sideways to seek the passage opening, the material rests so far that extinguishing sand cannot pass through.

Es ist günstig, die Anzeigefeder auf der Abschlußplatte über den Rand der Durchtrittsöffnung für den Anzeige­schmelzleiter vorstehen zu lassen, um den außen auf der Abschlußplatte festgelegten Anzeigeschmelzleiter in der Durchtrittsöffnung gegen ihre Wandung frei zu halten. Dadurch ist besonders gut sichergestellt, daß der An­zeigeschmelzleiter an der Abschlußplatte nicht fest­schweißen kann. Das wird auch schon durch die Dichtungs­schicht erschwert.It is expedient for the indicator spring on the end plate to protrude beyond the edge of the opening for the display fuse element in order to keep the indicator fuse element fixed on the outside of the end plate free in the passage opening against its wall. This ensures particularly well that the fuse element cannot weld to the end plate. This is already made difficult by the sealing layer.

Der erfindungsgemäße Aufbau eines Sicherungseinsatzes ermöglicht es, die Durchtrittsöffnung für den Anzeige­schmelzleiter relativ zu dessen Durchmesser weiträumig auszubilden, was einerseits das Durchfädeln erleichtert und andererseits die Funktion des Anzeigeschmelzleiters in noch höherem Maße sicherstellt.The construction of a fuse link according to the invention makes it possible to cover the passage opening for the display fuse element in relation to its diameter over a wide area to train, which on the one hand facilitates threading and on the other hand ensures the function of the fuse element to an even greater extent.

Die Erfindung soll nun anhand eines in der Zeichnung grob schematisch wiedergegebenen Ausführungsbeispiels näher erläutert werden:

  • In Figur 1 ist ein Sicherungseinsatz im Längsschnitt wiedergegeben.
  • In Figur 2 ist die Ansicht eines Sicherungseinsatzes in der Lage nach Figur 1 von rechts gesehen dar­gestellt.
  • In Figur 3 ist der Sicherungseinsatz nach Figur 2 von unten gesehen wiedergegeben.
  • In Figur 4 ist eine Einzelheit der rechten Abschluß­platte nach Figur 1 in vergrößertem Maßstab dargestellt.
  • In Figur 5 ist in der Art der Darstellung nach Figur 4 eine Montagemaßnahme veranschaulicht.
The invention will now be explained in more detail with reference to an exemplary embodiment shown roughly schematically in the drawing:
  • In Figure 1, a fuse link is shown in longitudinal section.
  • FIG. 2 shows the view of a fuse link in the position according to FIG. 1 seen from the right.
  • FIG. 3 shows the fuse link according to FIG. 2 seen from below.
  • FIG. 4 shows a detail of the right end plate according to FIG. 1 on an enlarged scale.
  • An assembly measure is illustrated in FIG. 5 in the manner of the illustration according to FIG.

Der Sicherungseinsatz nach Figur 1 weist zwischen Kon­taktmessern 1, 2 einen Arbeitsschmelzleiter 3 auf. Dar­über und elektrisch hierzu parallel ist ein Anzeige­schmelzleiter 4 mit einem Federblechanzeiger angeordnet. Der Anzeigeschmelzleiter 4 ist zwischen einer Abschluß­platte 6 und der gegenüberliegenden Abschlußplatte 7 gespannt, wobei das freie Ende der Anzeigefeder 5 nieder­gehalten wird. Wenn der Anzeigeschmelzleiter 4 durch­schmilzt, kann die Anzeigefeder 5 von der Abschlußplatte 6 auffedern und eine optische Anzeige geben.The fuse link according to FIG. 1 has a working fuse 3 between contact blades 1, 2. Above and electrically parallel to this, a display fuse element 4 with a spring plate indicator is arranged. The display fuse element 4 is stretched between an end plate 6 and the opposite end plate 7, the free end of the indicator spring 5 being held down. When the fuse element 4 melts, the indicator spring 5 can spring open from the end plate 6 and give a visual display.

Die Abschlußplatte 6 mit der Anzeigefeder 5 ist auf ihrer Innenseite mit einer Dichtungsschicht 14 versehen, die aus einem Asbest-Ersatzmaterial bestehen kann. Es kann auch ein papierartiger Werkstoff verwendet werden. Diese Dichtungsschicht kann von einer angespitzten Kanüle 20 in einem Führungsrohr 8 nach Figur 5 in der Montage durchstochen werden, um den Anzeigeschmelzleiter 4 durch die Abschlußplatte 6 in deren Durchtrittsöffnung 9 hindurchzufädeln. Die Dichtungsschicht 14 reicht dabei näher als bis auf den Betrag des Korndurchmessers des Löschsandes an den Anzeigeschmelzleiter 4 heran. In einem Isolierstoffgehäuse 10, beispielsweise aus Keramik, sind die Kontaktmesser 1, 2 mit ihren Flanschen 11 gehal­ten.The end plate 6 with the indicator spring 5 is provided on its inside with a sealing layer 14, which may consist of an asbestos replacement material. A paper-like material can also be used. This sealing layer can be pierced in the assembly by a pointed cannula 20 in a guide tube 8 according to FIG. 5 in order to thread the display fuse element 4 through the end plate 6 into its passage opening 9. The sealing layer 14 extends closer than the amount of the grain diameter of the sand to the display fuse element 4. The contact blades 1, 2 are held with their flanges 11 in an insulating material housing 10, for example made of ceramic.

Die Anzeigefeder 5 kann nach Figur 2 durch eine Ausklin­kung 12 in ihrer Federkraft auf den Anzeigeschmelzleiter 4 abgestimmt werden. Der Anzeigeschmelzleiter kann hin­ter der Durchtrittsöffnung 9 in der Abschlußplatte 6 umgelegt und festgeschweißt werden, um die Anzeigefeder 5 niederzuhalten. Im Ausführungsbeispiel tritt der Anzeige­schmelzleiter 4 durch eine Öffnung 13 in der Anzeigefe­der 5 hindurch. Die Abschlußplatten 6 und 7 können nach Figur 1 durch Schrauben 15 am Gehäuse des Sicherungsein­satzes verspannt sein.The spring 5 of the indicator spring 5 can be matched to the fuse element 4 according to FIG. 2 by a notch 12. The display fuse element can be flipped behind the passage opening 9 in the end plate 6 and welded in order to hold down the display spring 5. In the exemplary embodiment, the display fuse element 4 passes through an opening 13 in the display spring 5. The end plates 6 and 7 can be clamped according to Figure 1 by screws 15 on the housing of the fuse link.

Zur Abschlußplatte 6 mit der Anzeigefeder 5 gegenüberlie­gend ist der Anzeigeschmelzleiter 4 durch den Verschluß 16 der Einfüllöffnung für Löschsand festgelegt und mit einem Kontaktblech 17 nach Figur 3 verbunden. Die Anzei­gefeder 5 und das Kontaktblech 17 reiten auf den Kontakt­messern 2 bzw. 1 auf. Die Anzeigefeder 5 und das Kontakt­blech 17 sind durch Noppen 18 befestigt. Es ist günstig, wenn die Anzeigefeder 5 auf der Abschlußplatte 6 über den Rand der Durchtrittsöffnung für den Anzeigeschmelz­ leiter 4 vorstehend ausgebildet ist, wie es in Figur 4 veranschaulicht ist. Dadurch wird der Anzeigeschmelzlei­ter in der Durchtrittsöffnung 9 frei geführt. Die Durch­stichöffnung 19 in der Dichtungsschicht 14 ist in der Zeichnung bei übertriebenem Durchmesser verdeutlicht. Die Durchtrittsöffnung 9 für den Anzeigeschmelzleiter 4 kann relativ zu dessen Durchmesser weiträumig ausgebildet werden, da der Löschsand des Sicherungseinsatzes durch die Dichtungsschicht 14 von der Durchtrittsöffnung 9 in der Abschlußplatte abgehalten wird.To the end plate 6 with the indicator spring 5 opposite, the fuse element 4 is fixed by the closure 16 of the filling opening for sand and is connected to a contact plate 17 according to FIG. The indicator spring 5 and the contact plate 17 ride on the contact blades 2 and 1, respectively. The indicator spring 5 and the contact plate 17 are fastened by knobs 18. It is advantageous if the indicator spring 5 on the end plate 6 over the edge of the passage opening for the display melt conductor 4 is formed above, as illustrated in Figure 4. As a result, the display fuse element is guided freely in the passage opening 9. The piercing opening 19 in the sealing layer 14 is illustrated in the drawing with an exaggerated diameter. The passage opening 9 for the display fuse element 4 can be designed to be spacious relative to its diameter, since the extinguishing sand of the fuse link is prevented from the passage opening 9 in the end plate by the sealing layer 14.

Liste der BezugszeichenList of reference numbers

  • 1 Kontaktmesser1 contact knife
  • 2 Kontaktmesser, gegenüberliegend2 contact blades, opposite
  • 3 Arbeitsschmelzleiter3 working fuse
  • 4 Anzeigeschmelzleiter4 display fuse elements
  • 5 Anzeigefeder5 indicator spring
  • 6 Abschlußplatte auf der Anzeigeseite6 end plate on the display side
  • 7 Abschlußplatte auf der Sandfüllseite7 End plate on the sand filling side
  • 8 Führungsrohr8 guide tube
  • 9 Durchtrittsöffnung in Abschlußplatte9 passage opening in end plate
  • 10 Isolierstoffgehäuse10 insulating housing
  • 11 Flansch der Kontaktmesser11 flange of the contact blades
  • 12 Ausklinkung12 notch
  • 13 Öffnung in Anzeigefeder13 Opening in the indicator spring
  • 14 Dichtungsschicht14 sealing layer
  • 15 Schrauben15 screws
  • 16 Verschluß16 closure
  • 17 Kontaktblech17 contact plate
  • 18 Noppe18 pimples
  • 19 Durchstichöffnung in Dichtungsschicht19 puncture opening in the sealing layer
  • 20 Kanüle20 cannula

Claims (3)

1. Sicherungseinsatz, insbesondere für Niederspannungs-­Hochleistungs-Sicherungen, NH-Sicherungen genannt, der zwischen Kontaktmessern (1, 2) einen Arbeitsschmelzlei­ter (3) und darüber, elektrisch parallel hierzu einen Anzeigeschmelzleiter (4) mit Federblechanzeiger aufweist, wobei zwischen einer Anzeigefeder (5) an einer Abschluß­platte (6) und der gegenüberliegenden Abschlußplatte (7) ein Anzeigeschmelzleiter (4) gespannt ist, der das freie Ende der Anzeigefeder (5) niederhält, die nach Durch­schmelzen des Anzeigeschmelzleiters (4) von der Abschluß­platte (6) auffedert und eine optische Anzeige gibt, dadurch gekennzeichnet, daß die Abschlußplatte (6) mit der Anzeigefeder (5) auf ihrer Innenseite mit einer Dichtungsschicht (14) versehen ist, die von einer Kanüle (7) durchstechbar ist und im Bereich der Durchtrittsöffnung (9) in der Abdeckplatte näher an den Anzeigeschmelzleiter (4) heranreicht als es dem Korn­durchmesser des Löschsandes entspricht.1. Fuse insert, in particular for low-voltage high-performance fuses, NH fuses, which has a working fuse (3) between contact blades (1, 2) and, above that, an indicator fuse (4) with a spring plate indicator, in parallel, with an indicator spring ( 5) on an end plate (6) and the opposite end plate (7) a display fuse (4) is tensioned, which holds down the free end of the display spring (5), which springs open after the fuse link (4) has melted through the cover plate (6) and gives an optical display, characterized in that the end plate (6) with the indicator spring (5) is provided on its inside with a sealing layer (14) which can be pierced by a cannula (7) and in the area of the passage opening (9) in the cover plate comes closer to the fuse element (4) than it corresponds to the grain diameter of the sand. 2. Sicherungseinsatz nach Anspruch 1, dadurch gekennzeichnet, daß die Anzeigefeder (5) auf der Abschlußplatte (6) über den Rand der Durchtritts­öffnung (9) für den Anzeigeschmelzleiter (4) vorstehend ausgebildet ist.2. Fuse link according to claim 1, characterized in that the indicator spring (5) on the end plate (6) above the edge of the passage opening (9) for the fuse element (4) is formed above. 3. Sicherungseinsatz nach Anspruch 2, dadurch gekennzeichnet, daß die Durchtrittsöff­nung (9) für den Anzeigeschmelzleiter (4) relativ zu dessen Durchmesser weiträumig ausgebildet ist.3. A fuse link according to claim 2, characterized in that the passage opening (9) for the fuse element (4) is designed to be spacious relative to its diameter.
EP86110558A 1985-08-12 1986-07-30 Cartridge fuse with a spring blade indicator Expired - Lifetime EP0213404B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86110558T ATE61695T1 (en) 1985-08-12 1986-07-30 FUSE LINK WITH SPRING INDICATOR.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3528915 1985-08-12
DE3528915 1985-08-12

Publications (2)

Publication Number Publication Date
EP0213404A1 true EP0213404A1 (en) 1987-03-11
EP0213404B1 EP0213404B1 (en) 1991-03-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP86110558A Expired - Lifetime EP0213404B1 (en) 1985-08-12 1986-07-30 Cartridge fuse with a spring blade indicator

Country Status (6)

Country Link
EP (1) EP0213404B1 (en)
AT (1) ATE61695T1 (en)
BR (1) BR8603809A (en)
DE (1) DE3678067D1 (en)
GR (1) GR862106B (en)
IN (1) IN166377B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6373370B1 (en) * 1999-09-24 2002-04-16 Cooper Technologies Sputtered metal film fuse state indicator
US6456189B1 (en) * 2000-11-28 2002-09-24 Ferraz Shawmut Inc. Electrical fuse with indicator
US6809627B2 (en) 1998-07-31 2004-10-26 FLEXcon, Inc. Fuse indicator label

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE514968C (en) * 1930-12-20 Siemens Schuckertwerke Akt Ges One-piece fuse cartridge for use with stopper heads
US2357747A (en) * 1940-08-02 1944-09-05 Schweitzer & Conrad Inc Fuse construction
US2794095A (en) * 1954-11-15 1957-05-28 Chase Shawmut Co Striker pin structures
FR1549230A (en) * 1967-06-28 1968-12-13
FR93779E (en) * 1967-06-28 1969-05-16 Ferraz & Cie Lucien Improvements to fuse cartridges with operating indicator.
DE2705773A1 (en) * 1977-02-11 1978-08-17 Driescher Spezialfab Fritz Fuse cartridge with wire in indicator channel - is produced by machine with mechanically driven wire grip and guide element
DE3203211A1 (en) * 1982-02-01 1983-08-11 Siemens AG, 1000 Berlin und 8000 München Fuse insert, especially for low-voltage h.r.c. fuses

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE514968C (en) * 1930-12-20 Siemens Schuckertwerke Akt Ges One-piece fuse cartridge for use with stopper heads
US2357747A (en) * 1940-08-02 1944-09-05 Schweitzer & Conrad Inc Fuse construction
US2794095A (en) * 1954-11-15 1957-05-28 Chase Shawmut Co Striker pin structures
FR1549230A (en) * 1967-06-28 1968-12-13
FR93779E (en) * 1967-06-28 1969-05-16 Ferraz & Cie Lucien Improvements to fuse cartridges with operating indicator.
DE2705773A1 (en) * 1977-02-11 1978-08-17 Driescher Spezialfab Fritz Fuse cartridge with wire in indicator channel - is produced by machine with mechanically driven wire grip and guide element
DE3203211A1 (en) * 1982-02-01 1983-08-11 Siemens AG, 1000 Berlin und 8000 München Fuse insert, especially for low-voltage h.r.c. fuses

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6809627B2 (en) 1998-07-31 2004-10-26 FLEXcon, Inc. Fuse indicator label
US6373370B1 (en) * 1999-09-24 2002-04-16 Cooper Technologies Sputtered metal film fuse state indicator
US6456189B1 (en) * 2000-11-28 2002-09-24 Ferraz Shawmut Inc. Electrical fuse with indicator

Also Published As

Publication number Publication date
IN166377B (en) 1990-04-21
DE3678067D1 (en) 1991-04-18
GR862106B (en) 1986-12-30
ATE61695T1 (en) 1991-03-15
BR8603809A (en) 1987-03-17
EP0213404B1 (en) 1991-03-13

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