EP0852388B1 - Fuse-holder disconnector for switchboard - Google Patents

Fuse-holder disconnector for switchboard Download PDF

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Publication number
EP0852388B1
EP0852388B1 EP97203779A EP97203779A EP0852388B1 EP 0852388 B1 EP0852388 B1 EP 0852388B1 EP 97203779 A EP97203779 A EP 97203779A EP 97203779 A EP97203779 A EP 97203779A EP 0852388 B1 EP0852388 B1 EP 0852388B1
Authority
EP
European Patent Office
Prior art keywords
fuse
support
fixing means
outer casing
projection
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
EP97203779A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0852388A1 (en
Inventor
Elio Jacovino
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.)
ABB SACE SpA
Original Assignee
ABB SACE SpA
SACE SpA
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 ABB SACE SpA, SACE SpA filed Critical ABB SACE SpA
Publication of EP0852388A1 publication Critical patent/EP0852388A1/en
Application granted granted Critical
Publication of EP0852388B1 publication Critical patent/EP0852388B1/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
    • H01H85/54—Protective devices wherein the fuse is carried, held, or retained by an intermediate or auxiliary part removable from the base, or used as sectionalisers
    • H01H85/547—Protective devices wherein the fuse is carried, held, or retained by an intermediate or auxiliary part removable from the base, or used as sectionalisers with sliding fuse carrier

Definitions

  • the invention relates to a fuse-holder for a switchboard comprising an outer casing, a support which can move inside the casing and holds the fuse, and fixing means, preferably a pair of clamps or equivalent means, located inside the casing, into which the ends of the fuse are inserted, said fuse-holder exhibiting the mechanical characteristics required by the Standards relating to disconnectors.
  • Fuse-holders for switchboards are components, which are well known in the art, which normally constitute an essential element of electrical circuits (in particular of low-voltage electrical circuits) and which are generally mounted in a switchboard together with one or more thermo-magnetic circuit breakers, said fuse-holders being generally electrically and/or functionally coupled with said circuit breakers.
  • Such fuse-holders comprise an outer casing, located inside which are fixing means, preferably but not necessarily a pair of clamp elements, hereinafter referred to as "clamps", or equivalent means, into which the ends of the fuse are inserted, said fuse being carried by a support which can move inside the casing: the support can rotate or translate with respect to the outer casing so as to allow an operator to take the fuse out of the fuse-holder and replace it with an intact fuse, if the pre-existing fuse had "blown", and/or with a different fuse rated to "carry” a different nominal current.
  • fixing means preferably but not necessarily a pair of clamp elements, hereinafter referred to as "clamps”, or equivalent means
  • the operator inserts the support fully into the outer casing until the fuse engages in the fixing means present in the outer casing.
  • Fuse-holders of known type have often also the function of disconnectors, i.e. the job of breaking the electric circuit into which they are inserted preferably but not necessarily when this electric circuit is not traversed by current: thus, disconnectors are known which are able to operate "under load", i.e. when the electric circuit into which they are inserted is traversed by current.
  • fuse-holders of known type In fuse-holders of known type the operator, after having disengaged the fuse from the fixing means, can release the support in any position, without necessarily having to carry the support to a position such that the distance between the fixing means and the ends of the fuse is not less than the aforesaid specified minimum safety distance, which therefore is not guaranteed: under the Standard in force, fuse-holders of known type cannot therefore also function as disconnectors.
  • Documents GB-A-581048 and DE-U-8 716 273 disclose fuse-holders according to the preamble of claim 1.
  • the subject of the present invention is a fuse-holder according to claim 1.
  • the elastic means consists of a pair of spiral springs 7 (for clarity of description, in the figures only one spring 7 is visible) mounted inside the outer casing 5 (to which they are fixed in a manner known per se) in symmetrical positions with respect to the longitudinal axis of symmetry of the support 4.
  • Figure 1 shows, schematically, a cross-section of the invention with the ends 3 (seen more clearly in Figures 2 to 4) of the fuse 1 fully inserted into the clamps 2; the free end of each of the springs 7 is located in a recess 8 (seen more clearly in Figures 2 to 4) made on the front surface of the projection 9 belonging to a longitudinal rib 10 of the support 4.
  • the springs 7 are mounted in the outer casing 5 in such a way as to be inclined towards the clamps 2 when the fuse 1 is fully inserted into these clamps: under these conditions the forces exerted by the springs 7 tend to maintain the fuse 1 in its seat and ease the insertion thereof into the clamps 2, by reducing the force required from the operator.
  • Figure 2 shows, schematically, a cross-section of the invention in which the support 4, partially extracted from the outer casing 5 by the operator, has undergone a translation (of greater amplitude than the so-called “travel of disengagement” of the fuse 1 from the clamps 2) such as to unfasten the ends 3 of the fuse 1 from the clamps 2, which ends touch (or can touch) the clamps (to which they are in any event very close) but are no longer retained by the clamps 2; the distance between the clamps 2 and the ends 3 of the fuse 1 is in any event much less than the minimum safety distance prescribed by the Standards relating to disconnectors and, in a fuse-holder of known type, remains unchanged if for any reason the operator releases the support 4.
  • a translation of greater amplitude than the so-called “travel of disengagement” of the fuse 1 from the clamps 2
  • the distance between the clamps 2 and the ends 3 of the fuse 1 is in any event much less than the minimum safety distance prescribed by the Standards relating to disconnectors and, in a fuse-holder of known
  • Figure 3 shows, schematically, a cross-section of the invention in which the action of the springs 7 has extracted the support 4 from the outer casing 5 so as to carry the ends 3 of the fuse 1 to a distance from the clamps 2 not less than the minimum safety distance prescribed by the aforesaid Standards: the springs 7 have accomplished their task and are (or could be) unloaded.
  • the support 4 (released by the operator after having unfastened the fuse 1 from the clamps 2) is therefore positioned automatically in such a way as to satisfy the Standards relating to disconnectors.
  • Figure 4 shows, schematically, a cross-section of the invention in which the operator has extracted the support 4 fully from the outer casing 5: as the support 4 passes from the position of Figure 3 to that of Figure 4, the free end of each of the springs 7 runs (almost) without friction in a seat 12 formed in the corresponding rib 10 of the support 4.
EP97203779A 1996-12-04 1997-12-03 Fuse-holder disconnector for switchboard Expired - Lifetime EP0852388B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT96MI002543A IT1286436B1 (it) 1996-12-04 1996-12-04 Porta-fusibile sezionatore per quadro elettrico
ITMI962543 1996-12-04

Publications (2)

Publication Number Publication Date
EP0852388A1 EP0852388A1 (en) 1998-07-08
EP0852388B1 true EP0852388B1 (en) 2005-03-02

Family

ID=11375345

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97203779A Expired - Lifetime EP0852388B1 (en) 1996-12-04 1997-12-03 Fuse-holder disconnector for switchboard

Country Status (3)

Country Link
EP (1) EP0852388B1 (it)
ES (1) ES2238711T3 (it)
IT (1) IT1286436B1 (it)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5973418A (en) * 1998-05-05 1999-10-26 Cooper Technologies Company Pull-out high current switch
DE29903252U1 (de) * 1999-02-23 2000-08-03 Ceag Sicherheitstechnik Gmbh Elektrische Anlage
AT412927B (de) * 1999-04-20 2005-08-25 Felten & Guilleaume Ag Oester Schmelzsicherungsschalter
DE102009017338B4 (de) 2009-04-14 2016-12-01 Wöhner GmbH & Co. KG Elektrotechnische Systeme Halter für Sicherungen
FR2982705B1 (fr) * 2011-11-16 2013-11-15 Ece Dispositif de protection d'un circuit electrique alimente par un courant alternatif integrable dans un contacteur.
US9613776B2 (en) 2014-08-19 2017-04-04 Regal Beloit America, Inc. Fuse holder and associated method

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB581048A (en) * 1944-08-04 1946-09-30 Vernon Hope Improvements in or relating to push pull switch-fuses
US2842640A (en) * 1955-12-13 1958-07-08 Robert S Ragan Cam-actuated, quick break electric switch
BE567011A (it) * 1959-10-15
US4400678A (en) * 1981-04-29 1983-08-23 Chen Chang C Fuse switch box
DE3303471A1 (de) * 1983-02-02 1984-08-02 Siemens AG, 1000 Berlin und 8000 München Reihenklemme
DE8716273U1 (it) * 1987-12-09 1988-02-18 Klaus Bruchmann Gmbh, 8633 Roedental, De

Also Published As

Publication number Publication date
ITMI962543A1 (it) 1998-06-04
IT1286436B1 (it) 1998-07-08
ITMI962543A0 (it) 1996-12-04
ES2238711T3 (es) 2005-09-01
EP0852388A1 (en) 1998-07-08

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