EP0213404B1 - Sicherungseinsatz mit Federblechanzeiger - Google Patents

Sicherungseinsatz mit Federblechanzeiger Download PDF

Info

Publication number
EP0213404B1
EP0213404B1 EP86110558A EP86110558A EP0213404B1 EP 0213404 B1 EP0213404 B1 EP 0213404B1 EP 86110558 A EP86110558 A EP 86110558A EP 86110558 A EP86110558 A EP 86110558A EP 0213404 B1 EP0213404 B1 EP 0213404B1
Authority
EP
European Patent Office
Prior art keywords
indicator
spring
fuse element
indicating
fuse
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
EP86110558A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0213404A1 (de
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
Original Assignee
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/de
Publication of EP0213404A1 publication Critical patent/EP0213404A1/de
Application granted granted Critical
Publication of EP0213404B1 publication Critical patent/EP0213404B1/de
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-A-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 sleeve-shaped sheath which is inserted through the end plate, between the fuse element and the sheath electrical insulation must also be provided (DE-U-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 fuse element 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.

Landscapes

  • Fuses (AREA)
  • Helmets And Other Head Coverings (AREA)
  • Pens And Brushes (AREA)
  • Springs (AREA)
EP86110558A 1985-08-12 1986-07-30 Sicherungseinsatz mit Federblechanzeiger Expired - Lifetime EP0213404B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86110558T ATE61695T1 (de) 1985-08-12 1986-07-30 Sicherungseinsatz mit federblechanzeiger.

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 EP0213404A1 (de) 1987-03-11
EP0213404B1 true EP0213404B1 (de) 1991-03-13

Family

ID=6278330

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86110558A Expired - Lifetime EP0213404B1 (de) 1985-08-12 1986-07-30 Sicherungseinsatz mit Federblechanzeiger

Country Status (6)

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

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 (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5994993A (en) 1998-07-31 1999-11-30 Flexcon Company, 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

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE514968C (de) * 1930-12-20 Siemens Schuckertwerke Akt Ges Einteilige Schmelzsicherungspatrone zur Verwendung mit Stoepselkoepfen
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
FR93779E (fr) * 1967-06-28 1969-05-16 Ferraz & Cie Lucien Perfectionnements aux cartouches a fusibles avec indicateur de fonctionnement.
FR1549230A (cs) * 1967-06-28 1968-12-13
DE2705773A1 (de) * 1977-02-11 1978-08-17 Driescher Spezialfab Fritz Vorrichtung zum einbringen eines schmelzdrahtes in den kennmeldekanal einer nh-sicherungspatrone
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
GR862106B (en) 1986-12-30
ATE61695T1 (de) 1991-03-15
EP0213404A1 (de) 1987-03-11
IN166377B (cs) 1990-04-21
BR8603809A (pt) 1987-03-17
DE3678067D1 (de) 1991-04-18

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