EP2075811B1 - Improved terminal, particularly for automatic circuit breakers - Google Patents

Improved terminal, particularly for automatic circuit breakers Download PDF

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Publication number
EP2075811B1
EP2075811B1 EP20080010579 EP08010579A EP2075811B1 EP 2075811 B1 EP2075811 B1 EP 2075811B1 EP 20080010579 EP20080010579 EP 20080010579 EP 08010579 A EP08010579 A EP 08010579A EP 2075811 B1 EP2075811 B1 EP 2075811B1
Authority
EP
European Patent Office
Prior art keywords
lateral
terminal
lower side
constituted
tooth
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.)
Active
Application number
EP20080010579
Other languages
German (de)
French (fr)
Other versions
EP2075811A2 (en
EP2075811A3 (en
Inventor
Domenico Bosatelli
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.)
Gewiss SpA
Original Assignee
Gewiss SpA
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Filing date
Publication date
Application filed by Gewiss SpA filed Critical Gewiss SpA
Publication of EP2075811A2 publication Critical patent/EP2075811A2/en
Publication of EP2075811A3 publication Critical patent/EP2075811A3/en
Application granted granted Critical
Publication of EP2075811B1 publication Critical patent/EP2075811B1/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/58—Electric connections to or between contacts; Terminals
    • 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
    • H01H71/08—Terminals; Connections
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/28—Clamped connections, spring connections
    • H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
    • H01R4/36—Conductive members located under tip of screw
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/26—Connections in which at least one of the connecting parts has projections which bite into or engage the other connecting part in order to improve the contact
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/16—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for manufacturing contact members, e.g. by punching and by bending

Definitions

  • the present invention relates to an improved terminal particularly for automatic circuit breakers.
  • the main function that is required of terminals for electrical apparatuses, particularly for modular automatic circuit breakers, is generally to retain, by means of a screw, a rigid or flexible conductor against a connecting plate or block which is arranged within the terminal so as to provide a stable and strong electrical connection.
  • This type of connection must ensure a contact surface suitable to the current capacity, must not lose its mechanical retention over time, and, once clamping has been performed, the cable must not be damaged to the point of reducing its carrying cross-section below the limit set by the standard.
  • box terminals are manufactured by bending a band or strip made of steel or equivalent material, transversely with respect to its length, in at least four points, so as to obtain a closed box shape which is capable of containing both the connection block and one or more rigid or flexible conductors, required in order to establish the connection,
  • the shape of the terminal may vary according to the various applications and to the types of conductor that one intends to use.
  • the clamping action is achieved by acting on the screw usually arranged on the upper side.
  • the screw is inserted in a threaded hole and allows to move the terminal closer to the block and consequently achieve the clamping of the conductor between the lower inner side of the terminal and the lower side of the block or of the connecting plate.
  • a limitation observed in conventional box terminals is the low value of the clamping torque that can be applied without causing their deformation, ripping or, worse, breakage.
  • EP-A-0923100 discloses a terminal collar for a circuit breaker system.
  • the terminal is made of a solderless collar having a T-shaped joint provided with vertical tabs to prevent the weakest portion of the joint from rotating outwardly under the effects of the securing action of the set screw.
  • the aim of the present invention is to provide an improved terminal, particularly for automatic circuit breakers, which overcomes the drawbacks of the prior art.
  • An object of the invention is to provide a terminal which allows to achieve a higher clamping torque.
  • a further object of the invention is to provide a terminal of the so-called box type, which can be manufactured by optimizing the use of raw material, allowing to reduce the waste of raw material to a minimum, during the step for blanking and bending and during closure.
  • a further object is to provide a terminal which allows durable clamping of rigid and flexible cables.
  • a further object is to provide a terminal which allows to fit a finger-safe protection.
  • a furher object of the present invention is to provide a terminal which, by virtue of its particular constructive characteristics, is capable of giving the greatest assurances of reliability and safety in use.
  • a further object of the present invention is to provide a terminal which can be manufactured by using commonly commercially available elements and materials.
  • the terminal according to the invention comprises a parallelepipedal body 2 and an abutment screw 3.
  • the abutment screw 3 is associated with the body 2 so that the end of a conducting cable, not shown in the figures, can be pressed, by acting on the screw, within the parallelepipedal body 2, between the base of the body 2 and the end of the block, which is not visible in the figures.
  • the parallelapipedal body 2 Is constituted by a single piece of blanked and bent metal.
  • the body 2 is constituted by an upper surface 4 and two side walls blended thereto: a first side wall 5 and a second side wall 6.
  • the first side wall 5 ends with an inner lower side 7 and the second side wall 6 ends with an outer lower side 8.
  • a first joining point is constituted by a lateral seam 9, which is constituted by a tab 10 which protrudes from the outer lower side 8 and is engaged within a seat formed in the first side wall 5.
  • the second joining point is constituted by a stud 11, which is provided on the inner lower side 7 and engages a hole 12 provided in the outer lower side 8.
  • a lateral seat 13 is provided in the lower part of the second side wall 6, at the outer lower side 8 blended therewith, which is partially engaged by a lateral tooth 14 formed on the free end of the inner lower side 7.
  • a lower tooth 15 is also provided on a lateral edge of the outer lower side 8.
  • the lateral tooth 14 and the lower tooth 15 constitute an engagement means for a protection device 16.
  • the protection device 16 is constituted by a plate 17 provided with a lateral hook 18 and a rear hook 19.
  • the lateral hook 18 enters the lateral seat 13 and engages the lateral tooth 14.
  • the rear hook 19 engages the lower tooth 15, which partially enters an opening 20 formed in the rear hook 19.
  • the safety device 16 is simply engaged with a snap action on the terminal body 2, and in the active condition becomes an integral part thereof.
  • the safety device 16 constitutes a so-called finger-safe protection, because it obstructs the opening formed by lifting the body of the terminal, when the screw 3 is tightened to lock the conductor, in a per se known manner.
  • the exposed surface of the inner lower side 7 has a knurling 77, which facilitates the adhesion of the end of the conductor to the surface when the terminal is clamped.
  • the conductor is therefore locked between the exposed surface of the upper inner side 7 and the lower side of the block or an optional abutment member.
  • the shape of the terminal is optimized in order to minimize the waste of raw material during the blanking and bending step, and its closure is provided in multiple points.
  • the lateral seam 9 prevents the axial deformation of the terminal in the direction of the action of the screw 3, while the stud 11, arranged on the outer lower side and engaged in the hole 12 formed in the second lower side, prevents its transverse deformation.
  • This double seam system allows a clamping of both flexible and rigid cables which is durable over time.
  • the maximum clamping torque that can be obtained with this system is a function of the type of material used, of the cross-section and of any thermal treatments for hardening.
  • Suitable engagement members allow the snap fitting of the finger-safe protection 16.

Description

  • The present invention relates to an improved terminal particularly for automatic circuit breakers.
  • As is known, the main function that is required of terminals for electrical apparatuses, particularly for modular automatic circuit breakers, is generally to retain, by means of a screw, a rigid or flexible conductor against a connecting plate or block which is arranged within the terminal so as to provide a stable and strong electrical connection.
  • This type of connection must ensure a contact surface suitable to the current capacity, must not lose its mechanical retention over time, and, once clamping has been performed, the cable must not be damaged to the point of reducing its carrying cross-section below the limit set by the standard.
  • According to the prior art, box terminals are manufactured by bending a band or strip made of steel or equivalent material, transversely with respect to its length, in at least four points, so as to obtain a closed box shape which is capable of containing both the connection block and one or more rigid or flexible conductors, required in order to establish the connection,
  • The shape of the terminal may vary according to the various applications and to the types of conductor that one intends to use.
  • The clamping action is achieved by acting on the screw usually arranged on the upper side. The screw is inserted in a threaded hole and allows to move the terminal closer to the block and consequently achieve the clamping of the conductor between the lower inner side of the terminal and the lower side of the block or of the connecting plate.
  • A limitation observed in conventional box terminals is the low value of the clamping torque that can be applied without causing their deformation, ripping or, worse, breakage.
  • Over time, various more or less elaborate forms and systems for seaming or closing the box have been developed, achieving, in the case of simple systems, optimization of costs but low values of clamping torque or vice versa, in the case of complex systems, high torque values but with significantly high production costs.
  • EP-A-0923100 discloses a terminal collar for a circuit breaker system. The terminal is made of a solderless collar having a T-shaped joint provided with vertical tabs to prevent the weakest portion of the joint from rotating outwardly under the effects of the securing action of the set screw.
  • The aim of the present invention is to provide an improved terminal, particularly for automatic circuit breakers, which overcomes the drawbacks of the prior art.
  • An object of the invention is to provide a terminal which allows to achieve a higher clamping torque.
  • A further object of the invention is to provide a terminal of the so-called box type, which can be manufactured by optimizing the use of raw material, allowing to reduce the waste of raw material to a minimum, during the step for blanking and bending and during closure.
  • A further object is to provide a terminal which allows durable clamping of rigid and flexible cables.
  • A further object is to provide a terminal which allows to fit a finger-safe protection.
  • A furher object of the present invention is to provide a terminal which, by virtue of its particular constructive characteristics, is capable of giving the greatest assurances of reliability and safety in use.
  • A further object of the present invention is to provide a terminal which can be manufactured by using commonly commercially available elements and materials.
  • This aim and these and other objects which will become better apparent hereinafter are achieved by an improved terminal, particularly for automatic circuit breakers, as claimed in the appended claims.
  • Further characteristics and advantages will become better apparent from the description of preferred but not exclusive embodiments of the invention, illustrated by way of non-limiting example in the accompanying drawings, wherein:
    • Figure 1 is a partially exploded perspective view of the terminal;
    • Figure 2 is a perspective view of the terminal without the clamping screw;
    • Figure 3 is a partially exploded front view of the terminal;
    • Figure 4 is a side view of the terminal, in which the clamping screw is separated from the body of the terminal;
    • Figure 5 is a view, similar to the preceding one, but showing the clamping screw engaged in the body of the terminal;
    • Figure 6 is a bottom perspective view of the terminal body;
    • Figure 7 is a perspective view of the terminal body;
    • Figure 8 is a front view of the terminal body;
    • Figure 9 is a side view of the terminal body;
    • Figure 10 is a sectional side view, taken from the opposite side with respect to the preceding figure along the plane X-X of Figure 8;
    • Figure 11 is a side view, taken from the opposite side with respect to Figure 9;
    • Figure 12 is a sectional plan view, taken along the plane XII-XII of Figure 11;
    • Figure 13 is a bottom view of the terminal body.
  • With reference to the cited figures, the terminal according to the invention, generally designated by the reference numeral 1, comprises a parallelepipedal body 2 and an abutment screw 3. The abutment screw 3 is associated with the body 2 so that the end of a conducting cable, not shown in the figures, can be pressed, by acting on the screw, within the parallelepipedal body 2, between the base of the body 2 and the end of the block, which is not visible in the figures.
  • The parallelapipedal body 2 Is constituted by a single piece of blanked and bent metal. The body 2 is constituted by an upper surface 4 and two side walls blended thereto: a first side wall 5 and a second side wall 6.
  • The first side wall 5 ends with an inner lower side 7 and the second side wall 6 ends with an outer lower side 8.
  • The lower sides 7 and 8 are mutually joined in two joining points. A first joining point is constituted by a lateral seam 9, which is constituted by a tab 10 which protrudes from the outer lower side 8 and is engaged within a seat formed in the first side wall 5.
  • The second joining point is constituted by a stud 11, which is provided on the inner lower side 7 and engages a hole 12 provided in the outer lower side 8.
  • A lateral seat 13 is provided in the lower part of the second side wall 6, at the outer lower side 8 blended therewith, which is partially engaged by a lateral tooth 14 formed on the free end of the inner lower side 7.
  • A lower tooth 15 is also provided on a lateral edge of the outer lower side 8.
  • The lateral tooth 14 and the lower tooth 15 constitute an engagement means for a protection device 16.
  • The protection device 16 is constituted by a plate 17 provided with a lateral hook 18 and a rear hook 19.
  • The lateral hook 18 enters the lateral seat 13 and engages the lateral tooth 14.
  • The rear hook 19 engages the lower tooth 15, which partially enters an opening 20 formed in the rear hook 19.
  • Accordingly, the safety device 16 is simply engaged with a snap action on the terminal body 2, and in the active condition becomes an integral part thereof.
  • The safety device 16 constitutes a so-called finger-safe protection, because it obstructs the opening formed by lifting the body of the terminal, when the screw 3 is tightened to lock the conductor, in a per se known manner.
  • The exposed surface of the inner lower side 7 has a knurling 77, which facilitates the adhesion of the end of the conductor to the surface when the terminal is clamped.
  • The conductor is therefore locked between the exposed surface of the upper inner side 7 and the lower side of the block or an optional abutment member.
  • In practice it has been found that the invention achieves the intended aim and objects, an improved terminal particularly for automatic circuit breakers having been provided which has substantial advantages with respect to terminals of the prior art.
  • The shape of the terminal is optimized in order to minimize the waste of raw material during the blanking and bending step, and its closure is provided in multiple points.
  • In particular, the lateral seam 9 prevents the axial deformation of the terminal in the direction of the action of the screw 3, while the stud 11, arranged on the outer lower side and engaged in the hole 12 formed in the second lower side, prevents its transverse deformation.
  • This double seam system allows a clamping of both flexible and rigid cables which is durable over time.
  • The maximum clamping torque that can be obtained with this system is a function of the type of material used, of the cross-section and of any thermal treatments for hardening.
  • Laboratory tests have confirmed that, for an equal cross-section, for an equal material and an equal thermal treatment, the clamping torque that can be applied reaches higher values than obtainable with prior systems without deformations of the terminal.
  • Suitable engagement members allow the snap fitting of the finger-safe protection 16.

Claims (4)

  1. An improved terminal, particularly for automatic circuit breakers, comprising a strip which is blanked and bent so as to form a parallelepipedal body (2), an abutment screw (3) associated with said parallelepipedal body (2); said body (2) being constituted by at least two side walls (5, 6), an upper surface (4), and a lower surface (7, 8); said lower surface (7, 8) being constituted by the ends (,7, 8) of said plate which are mutually joined by at least two joining points; said two side walls (5, 6) comprise a first side wall (5) and a second side wall (6); said first side wall (5) ends with an inner lower side (7) and said second side wall (6) ends with an outer lower side (8); said lower sides (7, 8) are mutually joined in said two joining points; a first joining point is constituted by a lateral seam (9), which is constituted by a tab (10) which protrudes from the outer lower side (8) and is engaged in a seat formed in said first side wall (5); characterized in that a second joining point is constituted by a stud, provided on said inner lower side (7), and which engages a hole (12) formed in said outer lower side (8).
  2. The terminal according to claim 1, characterized in that it comprises a lateral seat (13) which is formed in the lower part of said second side wall (6), at the outer lower side (8) blended therewith, said lateral seat (13) being partially engaged by a lateral tooth (14) which is formed on the free end of said inner lower side (7); said terminal (1) comprising a lower tooth (15), which is formed on a lateral edge of said outer lower side (8); said lateral tooth (14) and said lower tooth (15) constituting an engagement means for a protection device (16).
  3. The terminal according to claim 2, characterized in that said protection device (16) is constituted by a plate (17) which is provided with a lateral hook (18) and a rear hook (19); said lateral hook (18) being inserted in said lateral seat (13) and engaging said lateral tooth (14); said rear hook (19) engaging said lower tooth (15), which partially enters an opening (20) formed in said rear hook (19).
  4. The terminal according to claim 1, characterized in that the exposed surface of said inner lower side (7) has a knurling (77) which facilitates the adhesion of the end of the conductor to said surface when the terminal is clamped.
EP20080010579 2007-12-28 2008-06-11 Improved terminal, particularly for automatic circuit breakers Active EP2075811B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITGE20070130 ITGE20070130A1 (en) 2007-12-28 2007-12-28 PERFECTED TERMINAL, PARTICULARLY FOR AUTOMATIC SWITCHES

Publications (3)

Publication Number Publication Date
EP2075811A2 EP2075811A2 (en) 2009-07-01
EP2075811A3 EP2075811A3 (en) 2009-07-22
EP2075811B1 true EP2075811B1 (en) 2013-08-14

Family

ID=40315485

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20080010579 Active EP2075811B1 (en) 2007-12-28 2008-06-11 Improved terminal, particularly for automatic circuit breakers

Country Status (4)

Country Link
EP (1) EP2075811B1 (en)
CN (1) CN101471204B (en)
ES (1) ES2428635T3 (en)
IT (1) ITGE20070130A1 (en)

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DE102009049709A1 (en) * 2009-10-17 2011-04-21 Abb Ag Screw terminal with cover and service switching device
DE102010033112B4 (en) * 2010-08-02 2021-02-04 Siemens Aktiengesellschaft Electrical installation device
BR112014014059A2 (en) * 2011-12-12 2017-06-13 Eaton Corp breaker terminal ear cap, breaker apparatus and method for protecting a breaker terminal ear from degradation or corrosion
US9293841B2 (en) * 2013-07-10 2016-03-22 Panduit Corp. Mechanical lug with dovetail interlock feature
JP5857226B2 (en) * 2014-04-01 2016-02-10 パナソニックＩｐマネジメント株式会社 Switchgear
US10319545B2 (en) 2016-11-30 2019-06-11 Iskra Za{hacek over (s)}{hacek over (c)}ite d.o.o. Surge protective device modules and DIN rail device systems including same
US10707678B2 (en) 2016-12-23 2020-07-07 Ripd Research And Ip Development Ltd. Overvoltage protection device including multiple varistor wafers
US10447026B2 (en) 2016-12-23 2019-10-15 Ripd Ip Development Ltd Devices for active overvoltage protection
US10340110B2 (en) 2017-05-12 2019-07-02 Raycap IP Development Ltd Surge protective device modules including integral thermal disconnect mechanisms and methods including same
US10685767B2 (en) 2017-09-14 2020-06-16 Raycap IP Development Ltd Surge protective device modules and systems including same
US11223200B2 (en) 2018-07-26 2022-01-11 Ripd Ip Development Ltd Surge protective devices, circuits, modules and systems including same
US11862967B2 (en) 2021-09-13 2024-01-02 Raycap, S.A. Surge protective device assembly modules
US11723145B2 (en) 2021-09-20 2023-08-08 Raycap IP Development Ltd PCB-mountable surge protective device modules and SPD circuit systems and methods including same

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US3638173A (en) * 1969-11-12 1972-01-25 Wadsworth Electric Mfg Co The Electrical connecting lug
US3775733A (en) * 1971-04-12 1973-11-27 Underwriters Safety Device Co Terminal block and terminal connector
DE3412317A1 (en) * 1984-04-03 1985-10-03 C.A. Weidmüller GmbH & Co, 4930 Detmold LADDER CONNECTION FOR LAMINATED PCB
DE3707780A1 (en) * 1987-03-11 1988-09-22 Schlegel Georg Fa SCREW TERMINAL FOR ELECTRIC LADDERS
FR2612340B1 (en) * 1987-03-13 1993-02-12 Merlin Gerin MULTIPLE CONNECTION TERMINAL FOR MODULAR ELECTRICAL APPARATUS
EP0337236B1 (en) * 1988-04-15 1993-12-22 Siemens Aktiengesellschaft Electrical terminal
IT237508Y1 (en) * 1997-05-20 2000-09-13 Gewiss Spa TERMINAL STRUCTURE WITH FINGER-PROOF PROTECTION, PARTICULARLY FOR ELECTRICAL EQUIPMENT
US5978208A (en) 1997-12-12 1999-11-02 Eaton Corporation Circuit breaker arrangement with improved terminal collar having interlock sections

Also Published As

Publication number Publication date
ITGE20070130A1 (en) 2009-06-29
EP2075811A2 (en) 2009-07-01
CN101471204A (en) 2009-07-01
EP2075811A3 (en) 2009-07-22
ES2428635T3 (en) 2013-11-08
CN101471204B (en) 2013-01-09

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