EP0155373B1 - High-voltage high-power fuse - Google Patents

High-voltage high-power fuse Download PDF

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Publication number
EP0155373B1
EP0155373B1 EP84114942A EP84114942A EP0155373B1 EP 0155373 B1 EP0155373 B1 EP 0155373B1 EP 84114942 A EP84114942 A EP 84114942A EP 84114942 A EP84114942 A EP 84114942A EP 0155373 B1 EP0155373 B1 EP 0155373B1
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EP
European Patent Office
Prior art keywords
fuse
pin
pawl
impact pin
impact
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
Application number
EP84114942A
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German (de)
French (fr)
Other versions
EP0155373A3 (en
EP0155373A2 (en
Inventor
Dietrich Dipl.-Ing. Mooz
Rolf Dirks
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.)
Felten and Guilleaume Energietechnik AG
Original Assignee
Felten and Guilleaume Energietechnik AG
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Application filed by Felten and Guilleaume Energietechnik AG filed Critical Felten and Guilleaume Energietechnik AG
Priority to AT84114942T priority Critical patent/ATE47250T1/en
Publication of EP0155373A2 publication Critical patent/EP0155373A2/en
Publication of EP0155373A3 publication Critical patent/EP0155373A3/en
Application granted granted Critical
Publication of EP0155373B1 publication Critical patent/EP0155373B1/en
Expired legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/14—Electrothermal mechanisms
    • 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
    • H01H85/306—Movable indicating elements acting on an auxiliary switch or contact
    • 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
    • H01H85/0241—Structural association of a fuse and another component or apparatus
    • H01H2085/0258—Structural association of a fuse or a fuse holder with a bimetallic element

Definitions

  • the invention relates to a high-voltage high-performance (HH) fuse according to the preamble of claims 1 and 2.
  • HH high-voltage high-performance
  • Such a high-voltage fuse is, for. B. from FR-A-1 461 736 (Fig. 2, 3) known.
  • HV fuses are devices for the one-time interruption of short-circuit currents in indoor and outdoor switchgear. These fuses are therefore suitable as short-circuit protection against voltage transformers, capacitors, cable branches, transformers and similar devices. They protect downstream devices and lines from the thermal and dynamic effects of large short-circuit currents, which they interrupt as current-limiting fuses when the current rises.
  • the HV fuses are only used for short-circuit protection, the overload protection is taken over by overcurrent devices on the secondary side (low voltage).
  • overcurrent devices on the secondary side (low voltage).
  • the HV fuses cannot switch off currents below their triple nominal current.
  • so-called full-range fuses have recently been offered, which represent a combination of a manual override fuse with an overload fuse.
  • this combination is very complex.
  • Switch disconnectors are generally combined with HV HRC fuses to connect distribution transformers to the medium-voltage network. Since the load-break switch safely masters the currents below three times the nominal fuse current, the object of the invention is to provide an HV fuse in addition to the short-circuit device with an overload device which is able to prevent an overcurrent occurring through the load-break switch connected upstream of the HV fuse switch off.
  • the trigger pin is triggered by a simple bimetal release when an overcurrent occurs and the upstream switch disconnector is released.
  • overcurrents are switched off by the switch disconnector and the HV HRC fuse did not need to be equipped with a switching capacity.
  • the device can be used several times by resetting the release pin after the bimetal release has cooled down.
  • the switch disconnector is released when there is an overcurrent by the tripping pin and in the event of a short circuit by the striker of the fuse.
  • the second solution provides a common release pin that responds in the event of an overcurrent by the bimetal release and in the event of a short circuit by the trigger pin.
  • the overload device is integrated in a cap of the fuse, so that the fuse fits into the fuse holder without additional measures.
  • a special embodiment of the fuse is that the cap with the overload device is designed so that it can be plugged onto a standard fuse (claim 5). It is advantageous here that the overload device can be reused for an intact fuse after the fuse has blown.
  • the main fuse element consists of two parallel conductors to achieve the necessary for the line voltage conductor length helically on a Keramikträ - ger 3 are wound up.
  • the secondary fuse element is usually a resistance wire connected in parallel to the main fuse element, which is inserted in the interior of the ceramic carrier. This resistance wire triggers an interruption detector during melting, which is designed as a striking pin 5.
  • the entire arrangement of the fuse is located in an insulating body 6 which is closed airtight on both sides by caps 7 which are designed as connecting contacts for the fuse holder.
  • a bimetallic release 8 which consists of a metal strip. This metal strip is bent at an angle at its ends, one part of the fastening on the inside of the cap top surface and the other part bent at an angle serving to accommodate a pawl 9.
  • the firing pin has the task of opening the switch disconnector after a short circuit. For this purpose, he passes through an outlet opening 10 on the cap, actuates a lever and hereby opens the upstream switch disconnector. In the event of a short circuit, the fuse must then be replaced will.
  • the striking pin is surrounded in the cap area by a tubular release pin 11. It has the task of tripping in the event of an overcurrent (overload), covering the same path as the striker and fulfilling the same function when opening the upstream switch disconnector as the striker. Both pins work completely independently of each other, but with the aim of switching off the switch disconnector.
  • the trigger pin has on its outer periphery a locking device 12, which serves as a locking point of the pawl 9.
  • the release pin is locked against the pressure of a spring 13 tensioned on the block.
  • the bimetallic release is connected to the fusible conductors via a flexible line 14.
  • a trigger pin 110 is provided, which surrounds a striker pin 50, which is shorter than the length of the trigger pin, as a hollow body.
  • Another pawl 16 is arranged on the bimetallic release 8 above the pawl 9. The pawl 16 is chamfered to secure and engages in a recess of the release pin. In the event of a short circuit, the striker pin hits the pawl and pushes the bimetallic release outwards, causing the release pin to snap outwards. When resetting, it can be determined whether the firing pin has triggered or not.
  • the bimetallic release can also be accommodated in a cap 70 which is designed as a plug-in part for a standard fuse.
  • the plug-in part with an insulating tube 17, which has the length of the cap and the securing attachment 18, is plugged or screwed onto the securing attachment.
  • the cap also contains a massive extension pin 111. In the event of a short circuit, this is pushed out by the striker pin 5, while in the event of an overcurrent, the tubular trigger pin 11 triggers.

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  • Fuses (AREA)
  • Switch Cases, Indication, And Locking (AREA)

Abstract

An HRC-fuse as an insulating body surrounding a main fusible conductor and an auxiliary fusible conductor connected to a spring biased impact pin. A conductive cap serving as a terminal for the fusible conductors is arranged on the insulating body and is provided with an outlet opening opposite the impact pin. A tripping hollow pin or sleeve coaxially surrounds at least a part of the impact pin and passes through the outlet opening. A bimetal release pawl is arranged in the one cap parallel to the pin and being electrically connected to the fusible conductors. The pawl engages a rest on the tripping sleeve to counteract a biasing spring. The impact pin and the tripping sleeve are triggered independently one from the other either by a short-circuit current melting the auxiliary conductor, or by an overload which heats up the bimetal release and triggers the sleeve. Both the tripping sleeve and the impact pin act on a load interruptor arranged opposite the outlet opening.

Description

Die Erfindung betrifft eine Hochspannungs-Hochleistungs (HH)-Sicherung gemäß dem Oberbegriff der Ansprüche 1 und 2. Eine derartige Hochspannungssicherung ist z. B. aus der FR-A-1 461 736 (Fig. 2, 3) bekannt.The invention relates to a high-voltage high-performance (HH) fuse according to the preamble of claims 1 and 2. Such a high-voltage fuse is, for. B. from FR-A-1 461 736 (Fig. 2, 3) known.

HH-Sicherungen sind Einrichtungen zum einmaligen Unterbrechen von Kurzschlußströmen in Innenraum- und Freiluft-Schaltanlagen. Diese Sicherungen eignen sich daher als Kurzschlußschutz vor Spannungswandler, Kondensatoren, Kabelabzweigen, Transformatoren und ähnlichen Einrichtungen. Sie schützen nachgeschaltete Geräte und Leitungen vor den thermischen und dynamischen Auswirkungen großer Kurzschlußströme, die sie als strombegrenzende Sicherungen schon im Stromanstieg unterbrechen.HV fuses are devices for the one-time interruption of short-circuit currents in indoor and outdoor switchgear. These fuses are therefore suitable as short-circuit protection against voltage transformers, capacitors, cable branches, transformers and similar devices. They protect downstream devices and lines from the thermal and dynamic effects of large short-circuit currents, which they interrupt as current-limiting fuses when the current rises.

Die HH-Sicherungen dienen nur dem Kurzschlußschutz, der Überlastschutz wird von Überstromorganen auf der Sekundärseite (Niederspannung) übernommen. Beim Versagen dieser Sekundärorgane oder bei Fehlern vorgeschalteter Einrichtungen, wie z. B. im Verteiler-Transformator besteht eine gefährliche Lücke in einem allumfassenden Schutzbereich, da die HH-Sicherungen Ströme unter ihrem dreifachen Nennstrom nicht abschalten konnen. Um dieser Lücke zu schließen, werden neuerdings sogenannte Vollbereichssicherungen angeboten, die eine Kombination -einer HH-Sicherung mit einer Überlastsicherung darstellen. Diese Kombination ist jedoch sehr aufwendig.The HV fuses are only used for short-circuit protection, the overload protection is taken over by overcurrent devices on the secondary side (low voltage). In the event of failure of these secondary organs or in the event of faults in upstream equipment, such as. B. in the distribution transformer there is a dangerous gap in an all-encompassing protection area, since the HV fuses cannot switch off currents below their triple nominal current. In order to close this gap, so-called full-range fuses have recently been offered, which represent a combination of a manual override fuse with an overload fuse. However, this combination is very complex.

Zum Anschluß von Verteiler-Transformatoren an das Mittelspannungsnetz werden im allgemeinen Lasttrennschalter mit HH-Sicherungen kombiniert. Da der Lasttrennschalter die Ströme unter dem dreifachen Sicherungs-Nennstrom sicher beherrscht, liegt der Erfindung die Aufgabe zugrunde, eine HH-Sicherung neben der Kurzschlußeinrichtung mit einer Überlasteinrichtung auszustatten, die in der Lage ist, einen auftretenden Überstrom durch den der HH-Sicherung vorgeschalteten Lasttrennschalter abzuschalten.Switch disconnectors are generally combined with HV HRC fuses to connect distribution transformers to the medium-voltage network. Since the load-break switch safely masters the currents below three times the nominal fuse current, the object of the invention is to provide an HV fuse in addition to the short-circuit device with an overload device which is able to prevent an overcurrent occurring through the load-break switch connected upstream of the HV fuse switch off.

Diese Aufgabe wird erfindungsgemäß durch die in den wei unabhängigen Ansprüchen angegebenen Maßnahmen gelöst.This object is achieved according to the invention by the measures specified in the white independent claims.

Die mit der Erfindung erzielten Vorteile bestehen darin, daß der Auslösestift bei Auftreten eines Übestromes durch einen einfachen Bimetallauslöser ausgelöst wird und der vorgeschaltete Lasttrennschalter entklinkt wird. Dadurch werden Überströme vom Lasttrennschalter abgeschaltet und die HH-Sicherung brauchte hierfür nicht mit einem eingenen Schaltvermögen ausgerüstet zu werden. Außerdem ist die Einrichtung durch Rückstellen des Auslösestifts nach Abkühlung des Bimetallauslösers mehrfach verwendbar. Nach einer ersten Lösung erfolgt die Entklinkung des Lasttrennschalters bei einem Überstrom durch den Auslösestift und bei Kurzschluß durch den Schlagstift der Sicherung. Die zweite Lösung sieht einen gemeinsamen Äuslösestift vor, der bei Überstrom durch den Bimetallauslöser und bei Kurzschluß durch den Shlagstift anspricht. In beiden Fällen ist die Überlasteinrichtung in einer Kappe der Sicherung integriert, womit die Sicherung in den Sicherungshalter ohne zusätzliche Maßnahmen paßt.The advantages achieved by the invention are that the trigger pin is triggered by a simple bimetal release when an overcurrent occurs and the upstream switch disconnector is released. As a result, overcurrents are switched off by the switch disconnector and the HV HRC fuse did not need to be equipped with a switching capacity. In addition, the device can be used several times by resetting the release pin after the bimetal release has cooled down. According to a first solution, the switch disconnector is released when there is an overcurrent by the tripping pin and in the event of a short circuit by the striker of the fuse. The second solution provides a common release pin that responds in the event of an overcurrent by the bimetal release and in the event of a short circuit by the trigger pin. In both cases, the overload device is integrated in a cap of the fuse, so that the fuse fits into the fuse holder without additional measures.

Vorteilhafte und zweckmäßige Ausgestaltungen des Gegenstandes nach den unabhängigen Ansprüchen sind den Unteransprüchen zu entnehmen.Advantageous and expedient refinements of the subject matter according to the independent claims can be found in the subclaims.

Eine besondere Ausführungsform der Sicherung besteht darin, daß die Kappe mit der Überlasteinrichtung so ausgebildet ist, daß sie auf eine Normsicherung aufsteckbar ist (Anspruch 5). Hierbei ist vorteilhaft, daß die Überlasteinrichtung nach Durchbrennen der Sicherung für eine intakte Sicherung wieder verwendbar ist.A special embodiment of the fuse is that the cap with the overload device is designed so that it can be plugged onto a standard fuse (claim 5). It is advantageous here that the overload device can be reused for an intact fuse after the fuse has blown.

Ausführungsbeispiele der Erfindung sind in Zeichnungen dargestellt und werden im folgenden näher erläutert. Es zeigen

  • Fig. 1 einen Bimetallauslöser in der Kappe einer Norm-HH-Sicherung mit nach außen getrennt wirkenden Auslöseund Schlagstiften, in Seitenansicht und im Schnitt,
  • Fig. 2 einen Bimetallauslöser in der Kappe einer Norm-HH-Sicherung mit nach außen gemeinsam wirkendem Auslösestift für Überlast und Kurzschluß, in Seitenansicht und im Schnitt,
  • Fig. 3 einen Bimetallauslöser in einer als Aufsteckteil für eine Norm-HH-Sicherung ausgebildeten Kappe mit nach außen getrennt wirkenden Auslöse- und Schlagstiften, in Seitenansicht und im Schnitt.
Embodiments of the invention are shown in drawings and are explained in more detail below. Show it
  • 1 shows a bimetallic release in the cap of a standard HH fuse with the release and striking pins acting separately on the outside, in side view and in section,
  • 2 shows a bimetallic release in the cap of a standard HH fuse with a release pin for overload and short circuit acting in common to the outside, in side view and in section,
  • Fig. 3 shows a bimetallic release in a cap designed as a plug-in part for a standard HH fuse with outwardly acting release and striking pins, in side view and in section.

Wie die Figur 1 zeigt, sind die wichtigsten Bestandteile einer HH-Sicherung 1 ein Hauptschmelzleiter 2 und ein hierzu parallel geschalteter Nebenschmelzleiter 4. Der Hauptschmelzleiter besteht aus zwei parallelen Leitern, die zur Erzielung der für die Netzspannung notwendigen Leiterlänge Schraubenförmig auf einem Keramikträ- ger 3 aufgewickelt sind. Der Nebenschmelzleiter ist in der Regel ein zum Hauptschmelzleiter parallel geschalteter Widerstandsdraht, der in dem Innern des Keramikträgers eingesetzt ist. Dieser Widerstandsdraht löst beim Schmelzen einen Unterbrechungsmelder aus, der als Schlagstift 5 ausgebildet ist. Die gesamte Anordnung der Sicherung befindet sich in einem Isolierkörper 6 der beidseitig luftdicht durch Kappen 7 verschlossen ist, die als Anschlußkontakte für den Sicherungshalter ausgebildet sind. In einer dieser Kappen ist ein Bimetallauslöser 8 eingesetzt, der aus einem Metallstreifen besteht. Dieser Matallstreifen ist an seinen Enden winklig abgebogen, wobei das eine Teil der Befestigung an der Innenseite der Kappendeckfläche und das andere winklig abgebogene Teil der Aufnahme einer Klinke 9 dient.As the Figure 1 shows, the main components of a HH-fuse 1, a main fuse element 2 and a thereto connected in parallel subordinate fusible conductor 4. The main fuse element consists of two parallel conductors to achieve the necessary for the line voltage conductor length helically on a Keramikträ - ger 3 are wound up. The secondary fuse element is usually a resistance wire connected in parallel to the main fuse element, which is inserted in the interior of the ceramic carrier. This resistance wire triggers an interruption detector during melting, which is designed as a striking pin 5. The entire arrangement of the fuse is located in an insulating body 6 which is closed airtight on both sides by caps 7 which are designed as connecting contacts for the fuse holder. In one of these caps, a bimetallic release 8 is used, which consists of a metal strip. This metal strip is bent at an angle at its ends, one part of the fastening on the inside of the cap top surface and the other part bent at an angle serving to accommodate a pawl 9.

Der Schlagstift hat die Aufgabe, nach einem Kurzschluß den Lasttrennschalter zu öffnen. Hierzu tritt er durch eine Austrittsöffnung 10 an der Kappe, betätigt einen Hebel und öffnet hiermit den vorgeschalteten Lasttrennschalter. In einem Kurzschlußfall muß dann die Sicherung erneuert werden.The firing pin has the task of opening the switch disconnector after a short circuit. For this purpose, he passes through an outlet opening 10 on the cap, actuates a lever and hereby opens the upstream switch disconnector. In the event of a short circuit, the fuse must then be replaced will.

Der Schlagstift ist im Kappenbereich von einem rohrförmigen Auslösestift 11 umgeben. Er hat die Aufgabe, bei einem Überstrom (Überlast) auszulösen, wobei er den gleichen Weg wie der Schlagstift zurücklegt und die gleiche Funktion bei der Öffnung des vorgeschalteten Lasttrennschalters erfüllt wie der Schlagstift. Beide Stifte arbeiten völlig unabhängig voneinander, jedoch mit dem Ziel, den Lasttrennschalter auszuschalten. Der Auslösestift besitzt an seinem äußeren Umfang eine Rastvorrichtung 12, die der Klinke 9 als Einrastpunkt dient. Die Verrastung des Auslösestifts erfolgt gegen den Druck einer auf Block gespannten Feder 13. Der Bimetallauslöser ist über eine flexible Leitung 14 mit den Schmelzleitern verbunden.The striking pin is surrounded in the cap area by a tubular release pin 11. It has the task of tripping in the event of an overcurrent (overload), covering the same path as the striker and fulfilling the same function when opening the upstream switch disconnector as the striker. Both pins work completely independently of each other, but with the aim of switching off the switch disconnector. The trigger pin has on its outer periphery a locking device 12, which serves as a locking point of the pawl 9. The release pin is locked against the pressure of a spring 13 tensioned on the block. The bimetallic release is connected to the fusible conductors via a flexible line 14.

Im Überstrom erwärmt sich der Bimetallauslöser und verschwenkt dabei zum Kappenrand. Mit dieser Bewegung wird die Klinke 9 von der Rastvorrichtung abgezogen und der Auslösestift schnellt nach außen.In the overcurrent, the bimetal release heats up and pivots to the edge of the cap. With this movement, the pawl 9 is pulled off the latching device and the trigger pin swings outwards.

Die genaue Einstellung des Bimetallauslösers ist mittels einer Einstellschraube 15 in einem bestimmten Toleranzbereich möglich. Dadurch laßt sich die Zuordnung Bimetallstrom zu Sicherungsnennstrom variieren. Nach Figur 2 ist ein Auslösestift 110 vorgesehen, der als Hohlkörper einen gegenüber der Länge des Auslösestifts verkürzten Schlagstift 50 umgibt. Oberhalb der Klinke 9 ist eine weitere Klinke 16 am Bimetallauslöser 8 angeordnet. Die Klinke 16 ist zur Sicherung hin abgeschrägt und greift in eine Aussparung des Auslösestifts. Im Kurzschlußfall stößt der Schlagstift gegen die Klinke und drückt den Bimetallauslöser nach außen, wodurch der Auslösestift nach außen schnellt. Beim Rückstellen kann festgestellt werden, ob der Schlagstift ausgelöst hat oder nicht.The exact setting of the bimetallic release is possible by means of an adjusting screw 15 within a certain tolerance range. This allows the assignment of the bimetal current to the nominal fuse current to be varied. According to FIG. 2, a trigger pin 110 is provided, which surrounds a striker pin 50, which is shorter than the length of the trigger pin, as a hollow body. Another pawl 16 is arranged on the bimetallic release 8 above the pawl 9. The pawl 16 is chamfered to secure and engages in a recess of the release pin. In the event of a short circuit, the striker pin hits the pawl and pushes the bimetallic release outwards, causing the release pin to snap outwards. When resetting, it can be determined whether the firing pin has triggered or not.

Im Überstromfall erfolgt die Auslösung des Auslösestifts unter den gleichen Bedingungen wie nach Fig. 1.In the event of an overcurrent, the tripping pin is triggered under the same conditions as in FIG. 1.

Nach Fig. 3 kann der Bimetallauslöser auch in einer Kappe 70 untergebracht werden, die als Steckteil für eine Normsicherung ausgebildet ist. Hierbei wird das Steckteil mit einem Isolierrohr 17, das die Länge der Kappe und des Sicherungsansatzes 18 aufweist, auf den Sicherungsansatz aufgesteckt bzw. aufgeschraubt. Die Kappe enthält neben dem Auslösestift 11 noch einen massiven Verlängerungsstift 111. Dieser wird im Kurzschlußfall vom Schlagstift 5 herausgedrückt, während im Überstromfall eine Auslösung durch den rohrförmigen Auslösestift 11 erfolgt.3, the bimetallic release can also be accommodated in a cap 70 which is designed as a plug-in part for a standard fuse. Here, the plug-in part with an insulating tube 17, which has the length of the cap and the securing attachment 18, is plugged or screwed onto the securing attachment. In addition to the trigger pin 11, the cap also contains a massive extension pin 111. In the event of a short circuit, this is pushed out by the striker pin 5, while in the event of an overcurrent, the tubular trigger pin 11 triggers.

Claims (6)

1. A high-voltage higt-power (HH) fuse having a main fuse wire (2) for interrupting short-circuit current, an auxiliary fuse wire (4) for tripping an impact pin (5) which is under spring tension, and having an insulating body (6) surrounding both fuse wires, this insulating body being closed on both sides in an air-tight manner with covers (7) which are designed as connecting contacts between the fuse wires and the external connections, characterized in that the impact pin (5) in the area of one of the covers (7) is surrounded by a trip pin (11) which is pipe-shaped in design and is, like the impact pin (5), guided up to the outlet (10) of the cover (7) in that in this cover a bimetallic tripping device (8) is inserted into the circuit of the HH fuse (1), which tripping device is provided with a pawl (9) which catches the trip pin (11) and is under spring tension, and in that the bimetallic tripping device (8) is adjusted in such a way that when an overcurrent occurs it releases the trip pin (11) which for its part opens a power breaker which is connected in series.
2. A high-voltage high-power (HH) fuse having a main fuse wire (2) for interrupting short-circuit current, an auxiliary fuse wire (4) for tripping an impact pin (50) which is under spring tension, and an having insulating body (6) surrounding both fuse wires and being closed on both sides in an air-tight manner with covers (7) which are designed as connecting contacts between the fuse wires and the external connections, characterized in that the impact pin (50) in the area of one of the covers (7) is surrounded by a trip pin (110) which is pipe-shape in design, in that the impact pin (50) has a shortened length compared with the trip pin (110), in that in this cover (7) a bimetallic tripping device (8) has a second pawl (16) next to a first pawl (9), which second pawl engages into a recess of the pipe-shaped trip pin (110), and in that with an overcurrent the first pawl (9) and with a short-circuit current the second pawl (16) which is impacted on by the impact pin (110), releases the trip pin.
3. A fuse in accordance with one of Claims 1 to 2, characterized in that the bimetallic tripping device (8) is designed in the form of a strip running parallel to the trip pin (11 ; 110), the length of which strip is calculated in such a way that the pawl (9) arranged at the free end of the strip holds the impact pin in place against the pressure of the spring (13) tensioned on a block, the pawl engaging on an engaging toothing (12) of the trip pin, which engaging toothing is arranged on the circumference in the area of the open end.
4. A fuse in accordance with one of the Claims 1 to 3, characterized in that the minimum operating value of the bimetallic tripping device (8) is adjustable by means of a screw (15) to be operated from outside of the cover (7).
5. A fuse in accordance with one of Claims 1, 3 and 4, characterized in that the impact pin (5) is lengthened into the cover length by a solid trip pin (111), and in that the cover (70) with the bimetallic tripping device (8) is pushed onto the joining piece (18) by means of an insulation pipe (17).
6. A fuse in accordance with one of Claims 1 to 5, characterized in that the cover (70) with the bimetallic tripping device (8) can be screwed to the fuse (1) and can be exchanged between different fuses.
EP84114942A 1984-03-17 1984-12-07 High-voltage high-power fuse Expired EP0155373B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84114942T ATE47250T1 (en) 1984-03-17 1984-12-07 HIGH VOLTAGE, HIGH POWER FUSE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843409957 DE3409957A1 (en) 1984-03-17 1984-03-17 HIGH VOLTAGE HIGH PERFORMANCE FUSE
DE3409957 1984-03-17

Publications (3)

Publication Number Publication Date
EP0155373A2 EP0155373A2 (en) 1985-09-25
EP0155373A3 EP0155373A3 (en) 1987-04-22
EP0155373B1 true EP0155373B1 (en) 1989-10-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP84114942A Expired EP0155373B1 (en) 1984-03-17 1984-12-07 High-voltage high-power fuse

Country Status (5)

Country Link
US (1) US4617544A (en)
EP (1) EP0155373B1 (en)
JP (1) JPS60211735A (en)
AT (1) ATE47250T1 (en)
DE (2) DE3409957A1 (en)

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DE3607596A1 (en) * 1986-03-07 1987-09-10 Ritz Messwandler Kg High-voltage fuse
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Also Published As

Publication number Publication date
ATE47250T1 (en) 1989-10-15
DE3480142D1 (en) 1989-11-16
EP0155373A3 (en) 1987-04-22
JPS60211735A (en) 1985-10-24
JPS6153813B2 (en) 1986-11-19
DE3409957A1 (en) 1985-09-19
DE3409957C2 (en) 1989-02-09
US4617544A (en) 1986-10-14
EP0155373A2 (en) 1985-09-25

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