EP0309924A2 - Gekapselte Gehäuse- und Deckelanordnung für Strombegrenzungsschalter - Google Patents

Gekapselte Gehäuse- und Deckelanordnung für Strombegrenzungsschalter Download PDF

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Publication number
EP0309924A2
EP0309924A2 EP88115602A EP88115602A EP0309924A2 EP 0309924 A2 EP0309924 A2 EP 0309924A2 EP 88115602 A EP88115602 A EP 88115602A EP 88115602 A EP88115602 A EP 88115602A EP 0309924 A2 EP0309924 A2 EP 0309924A2
Authority
EP
European Patent Office
Prior art keywords
circuit breaker
cover
breaker enclosure
enclosure
side walls
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
EP88115602A
Other languages
English (en)
French (fr)
Other versions
EP0309924A3 (en
EP0309924B1 (de
Inventor
Francesco De Vizzi
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.)
CGE Generale Elettromeccanica SpA
Original Assignee
CGE Generale Elettromeccanica 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 CGE Generale Elettromeccanica SpA filed Critical CGE Generale Elettromeccanica SpA
Publication of EP0309924A2 publication Critical patent/EP0309924A2/de
Publication of EP0309924A3 publication Critical patent/EP0309924A3/en
Application granted granted Critical
Publication of EP0309924B1 publication Critical patent/EP0309924B1/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
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/02—Housings; Casings; Bases; Mountings
    • H01H71/025—Constructional details of housings or casings not concerning the mounting or assembly of the different internal parts
    • H01H71/0257—Strength considerations

Definitions

  • This invention relates to a unique insulating enclosure for low voltage current limiting circuit breakers and, more specifically, to the inter-­connection between the case and the cover of the enclosure to allow the enclosure to strongly resist the overpressure caused by gases generated during the interruption process.
  • the standard insulating molded plastic enclosure for such low voltage circuit breakers consists of an enclosure, which contains the circuit breakers components, provided with a cover having openings for an operat­ing handle.
  • the cover is usually attached to the case by screws passing through the cover itself to engage threaded openings in the case. Additionally, the cover includes projecting ridges for accurate alignment with the case.
  • the high gas pressure generated when a short circuit occurs, exerts a strong mechanical stress to the side walls of the case which ordinarily is incapable of resisting such high pressure. Accordingly, it is con­sidered beneficial to transfer such stress from the side walls of the case to the cover which is more capable of resisting stress because of the reduced height and increased thickness of the cover.
  • Another know method of reinforcing the enclosure consisted of providing a number of metal pins in the edge of the cover received whithin cor­responding recesses formed in the cross-section of the side walls of the case. The method was effective for increasing the resistance of the en­closure to stress but resulted in an increase in the overall cost of manufacturing the cover and the case.
  • the invention comprises a current limiting circuit breaker enclosure hav­ing a case and a cover which include a plurality of dovetail intercon­nections to provide increased stress resistance to the enclosure.
  • the cover is provided with dovetail projections having edges that taper inwardly toward the cover while the case is provided with corresponding slots which taper outwardly from the case to receive the dovetails proj­ections.
  • a further embodiment includes a metal tang embedded within the dovetails projections on the cover to provide increased stiffness to the dovetail projections.
  • the molded plastic insulating enclosure 10 shown in Figure 1 is designed for a current limiting circuit breaker, according to the invention and consists of a case 12 which houses the components of the low voltage circuit breaker (not shown) and a cover 14.
  • the case includes two side walls 16 and 18 which occur upon short circuit interruption whereby the gases developed in the arc chambers of the circuit breaker generate such a high internal pressure that side walls would otherwise camber and move away from each other.
  • the upper edges of the side walls 16 and 18 have, at both ends, areas defined at 23, 24, 26 and 28 respectively which are separated by recesses 20a, 20b, 20c, 20d, 20e, 20f, 20g and 20h, alternated with outwardly tapered protrusions 22a, 22b, 22c, 22e, 22f and 22g.
  • Each of the protrusions is defined by a narrow exterior surface and a wider interior surface.
  • the cover is provided with a pair of opposing side walls 30A, 30B.
  • a plurality of dovetail-shaped projections 32a, 32b, 32c, 32d alternate with recesses 34a, 34b, 34c which reciprocally align with the protusions 22a-d of the corresponding side wall 16 as best seen by referring to Figure 2.
  • a pair of thru-holes 36 and 38 on one end of the cover 14 aligns with the corresponding threaded holes 44 and 46 and in the case 12, for attaching the cover to that side of the case 12.
  • a similar pair of thru-holes 52 and 54 on the opposite side of the cover aligns with a corresponding pair of threaded holes 64 and 66 in the case for attaching the opposite end of the cover to the case as shown in Figure 1.
  • the remaining thru-holes 40, 42, 56 and 58 in the cover respectively align with corresponding thru-­holes 48, 50, 60 and 62 in the case to allow for attaching the circuit breaker within a panelboard.
  • Such additional support consists of a U-shaped sheet metal bracket 70 embedded in the top and side walls of the cover itself.
  • the U-shaped bracket includes a first leg 72, exending from the interior to the exterior of the cover, a bight 74 and second leg 76 extending from the exterior to the interior of the cover.
  • the legs 72, 76, and bight 74 are embedded in the molded top part of the cover 14 so that the entire braket 70 is embedded in the insulating plastic material forming the cover as indicated at 80.
  • a plurality of holes 82 are formed in the metal sheet of the bracket.
  • the holes beome filled with the plastic material 80 during the molding pro­cess.
  • a tail piece or tang 84 protrudes from yoke or bight 74 of the bracket 70 which extends into the protrusions of the lateral wall of the cover to enhance the strength of the dovetail projec­tions as depicted at 32a in Figure 5.
  • the dovetail projections such as 32a, 32b in Figure 4 are provided with tapered edges 88, 90 which complement corresponding tapered edges 92, 94 and the recesses 20a-d in the side walls of the case 12.
  • the gaps between the tops 96 of the dovetail 32a-d of the cover 14 and the bottoms 98 of the recesses 20a-d of the case 12 permit a limited amount of gas venting from the enclosure 10. There are no gaps between the tops 100 of the prostrusions 22a-d of the case and the bottoms 102 of the recesses 34a-d of the cover in order to insure that the cover sits solidly on the case.
  • the U-shaped brackets receive the gas pressure through the tail piece 84 when enbedded in the body of the dovetail projections and transfer the gas pressure to the top 78 of the cover by means of legs 72 and 76. As depicted in figure 5, the operation of the bracket 70 is insured by an accurate positioning of the tang 84 inside the body of the dovetail projection 32a.
  • This positioning is obtained by using the folded tang 87 as a reference point which, in turn, allows the bracket 70 to be positioned within the mold during the manufacturing of the cover 14 itself.

Landscapes

  • Switch Cases, Indication, And Locking (AREA)
  • Casings For Electric Apparatus (AREA)
  • Breakers (AREA)
  • Fuses (AREA)
  • Distribution Board (AREA)
  • Motor Or Generator Frames (AREA)
EP88115602A 1987-09-29 1988-09-22 Gekapselte Gehäuse- und Deckelanordnung für Strombegrenzungsschalter Expired - Lifetime EP0309924B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2245287U 1987-09-29
IT8722452U IT211844Z2 (it) 1987-09-29 1987-09-29 Accoppiamento tra base e coperchio di un interruttore in scatola isolante stampata particolarmente resistente a deformazioni e rotture dovute a sovrappressioni derivate da gas prodotti da archi o simili.

Publications (3)

Publication Number Publication Date
EP0309924A2 true EP0309924A2 (de) 1989-04-05
EP0309924A3 EP0309924A3 (en) 1990-06-13
EP0309924B1 EP0309924B1 (de) 1994-07-20

Family

ID=11196492

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88115602A Expired - Lifetime EP0309924B1 (de) 1987-09-29 1988-09-22 Gekapselte Gehäuse- und Deckelanordnung für Strombegrenzungsschalter

Country Status (4)

Country Link
EP (1) EP0309924B1 (de)
AT (1) ATE108944T1 (de)
DE (1) DE3850732T2 (de)
IT (1) IT211844Z2 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2637120A1 (fr) * 1988-09-29 1990-03-30 Gen Electric Agencement de boitier et de couvercle en materiau plastique moule pour des disjoncteurs a limitation de courant
WO2001039230A1 (de) * 1999-11-26 2001-05-31 Siemens Aktiengesellschaft Elektrisches schaltgerät mit mehreren gehäuseteilen
EP4280249A1 (de) * 2022-05-20 2023-11-22 Rockwell Automation Technologies, Inc. Schutzschaltergehäuse mit zweistufiger struktur

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB530353A (en) * 1939-06-22 1940-12-10 Crabtree & Co Ltd J A Improvements in, and connected with, boxes or covers for electrical apparatus
US3632939A (en) * 1970-02-16 1972-01-04 Westinghouse Electric Corp Circuit interrupter with improved molded insulating housing
DE7711221U1 (de) * 1977-04-09 1977-08-18 Ellenberger & Poensgen Gmbh, 8503 Altdorf Klemmbrett für elektrische Installationsgeräte
DE2802553B1 (de) * 1978-01-19 1979-01-18 Siemens Ag Niederspannungs-Leistungsschalter mit geteiltem Isolierstoffgehaeuse
IT210417Z2 (it) * 1987-06-09 1988-12-30 Bassani Spa Apparecchiatura elettrica di protezione magnetermica e differenziale.

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2637120A1 (fr) * 1988-09-29 1990-03-30 Gen Electric Agencement de boitier et de couvercle en materiau plastique moule pour des disjoncteurs a limitation de courant
WO2001039230A1 (de) * 1999-11-26 2001-05-31 Siemens Aktiengesellschaft Elektrisches schaltgerät mit mehreren gehäuseteilen
US6911883B1 (en) 1999-11-26 2005-06-28 Siemens Aktiengesellschaft Electrical switchgear comprising several housing parts
EP4280249A1 (de) * 2022-05-20 2023-11-22 Rockwell Automation Technologies, Inc. Schutzschaltergehäuse mit zweistufiger struktur

Also Published As

Publication number Publication date
IT211844Z2 (it) 1989-05-25
EP0309924A3 (en) 1990-06-13
IT8722452V0 (it) 1987-09-29
ATE108944T1 (de) 1994-08-15
EP0309924B1 (de) 1994-07-20
DE3850732D1 (de) 1994-08-25
DE3850732T2 (de) 1995-03-16

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