EP0708470A1 - Thermoschutzbauteil für einen Selbstschalter - Google Patents

Thermoschutzbauteil für einen Selbstschalter Download PDF

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Publication number
EP0708470A1
EP0708470A1 EP95202803A EP95202803A EP0708470A1 EP 0708470 A1 EP0708470 A1 EP 0708470A1 EP 95202803 A EP95202803 A EP 95202803A EP 95202803 A EP95202803 A EP 95202803A EP 0708470 A1 EP0708470 A1 EP 0708470A1
Authority
EP
European Patent Office
Prior art keywords
appendage
cantilevered
circuit breaker
terminal
unit according
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
EP95202803A
Other languages
English (en)
French (fr)
Other versions
EP0708470B1 (de
Inventor
Sergio Pianezzola
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.)
BTicino SpA
Original Assignee
BTicino 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 BTicino SpA filed Critical BTicino SpA
Priority to SI9530242T priority Critical patent/SI0708470T1/xx
Publication of EP0708470A1 publication Critical patent/EP0708470A1/de
Application granted granted Critical
Publication of EP0708470B1 publication Critical patent/EP0708470B1/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
    • H01H71/08—Terminals; Connections
    • 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
    • H01H71/16—Electrothermal mechanisms with bimetal element
    • 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
    • H01H1/5855—Electric connections to or between contacts; Terminals characterised by the use of a wire clamping screw or nut
    • H01H2001/5861—Box connector with a collar or lug for clamping internal rail and external conductor together by a tightening screw

Definitions

  • the present invention relates to a thermal protection unit for automatic switches and the like, known as disjunctors or circuit breakers.
  • Automatic circuit breakers for example, of the modular type used for protecting electrical installations comprise complex contact-opening and -closing mechanisms.
  • the contacts are closed by a manual arming device which can also open them upon manual operation and the contacts have to open automatically as a result of excess currents passing through the circuit breaker, in order to protect the electrical installations against overloads and short-circuits.
  • Overload protection is ensured by a bimetal element through which the load current passes and which is heated, owing to the Joule effect, by the current flowing through it and bends until it acts on a release device and thus causes the contacts to open.
  • the overload or thermal protection requires precision and repeatability of operation and has to ensure that, for a predetermined overload condition corresponding, for example, to a current of 20 amperes lasting for a predetermined period, for example, of 30 seconds, the contacts will open.
  • the thermal protection for an automatic circuit breaker therefore requires a calibration operation which has to be carried out on each individual circuit breaker and which then has to ensure repeatability of operation and prevent possible loss of calibration.
  • the bimetal element which constitutes the overload sensor generally forms a rigid member cantilevered on a relatively flexible support the free end of which acts on the release device.
  • a calibration screw accessible from outside the circuit breaker acts on the flexible support at the joint where the member is fixed and enables the angle of the joint to be changed so as to pivot the member on the joint and bring about a travel of the free end of the member.
  • the flexible support of the member which is made of conductive material, may form an electrical connection with other parts of the circuit to which it is fixed mechanically by crimping, riveting or welding which also ensure electrical continuity.
  • a further disadvantage is constituted by the bulk represented by these connection elements which, although flexible, must not interfere with the thermal deformations of the bimetal member.
  • the present invention solves this problem and provides a thermal protection unit for an automatic circuit breaker constituted by a small number of elements and fixed directly by electric welding to a terminal of the circuit breaker having an integral appendage which acts as a fixed support for the bimetal member and which can be calibrated.
  • the number of components to be assembled is also reduced to a minimum, the production process is simplified and size is reduced with clear advantages in terms of cost and compactness.
  • An arc-switching or arc-guide electrode is also advantageously fixed to the connection terminal by the same electric welding operation as the bimetal member.
  • an automatic circuit-breaker incorporating a thermal protection unit comprises a generally rectangular parallelepipedal casing 50 constituted by two coupled half-shells one of which is shown in section in the coupling plane in order to place greater emphasis on the internally ribbed structure of the half-shells.
  • the frames and internal ribs of the two half-shells interpenetrate in a suitable manner and precisely position the two half shells and the various components housed in the casing relative to one another.
  • the two half-shells are fixed together by means of screws or rivets extending through holes 51, 52, 53, 54, 55 perpendicular to the plane of the drawing.
  • the circuit breaker shown is a modular circuit breaker for installation on a rail with several modules arranged side by side along the faces of the casings parallel to the coupling plane of the half-shells or side faces.
  • the circuit breaker has a recess 56 in its rear wall for housing a standard DIN rail on which the circuit breaker is engaged by means of toothed engagement slides not shown.
  • a plurality of mechanical and electrical components is housed and precisely positioned in the casing; in particular, these are:
  • the overall view gives an idea of the structural complexity of the circuit breaker, of the assembly difficulties, of the compactness requirements and of the small size which the various components have to have in order to be housed in a casing of limited dimensions.
  • the energized electromagnet 59 throws a striker against the release device activating it and causing the contacts to open.
  • the free end of the plate 10 then interferes with a tooth of the slide 8 bringing about translation thereof and a second tooth of the slide 8 interferes with a tooth of the release device causing activation thereof and consequent opening of the contacts.
  • the electric arc which develops between the contacts 3 and 4 upon opening travels from the contact 4 to the arc-guide electrode 11 which conveys it towards the arc-extinguishing cell 60.
  • the arc-guide electrode Due to the travelling of the arc, the arc-guide electrode has to be connected electrically to the movable contact 4.
  • the braid 6 is fixed, again by electric welding, near the free end of the bimetal plate and is connected to the movable contact arm 5 by a third electrical weld.
  • the arc-guide electrode 11 is advantageously also connected mechanically and electrically to the plate by the same electric welding operation which connects the bimetal plate 10 mechanically and electrically to the appendage 9 of the terminal 57, further reducing the number of welding operations.
  • Figure 2 is an exploded perspective view of a preferred embodiment of the thermal protection unit formed according to the present invention.
  • a terminal block 20 is produced by successive bending operations and is constituted by two perpendicular pairs of faces 21, 22, 23, 24 the faces of each pair being parallel with one another.
  • a face 22 formed by the end of the blank constitutes one jaw of the terminal.
  • a face 21 parallel to the face 22 has a hole 25 through which a clamping screw 26 of the terminal can pass freely.
  • the face 22 is connected to the face 21 by a front block face 23 of the block and by the rear face 24 on which the face 22 is engaged by a tooth 27.
  • Lateral undercuts are formed near the bent portions of the blank with the dual effect of facilitating the bending operation and forming, on the sides of the front and rear faces, anchoring teeth 28, 29, 30, 31 which, by engaging in suitable slots in the casing, position the block correctly and firmly in the casing.
  • the rear face 24 is extended, via a first connecting elbow 32 with a hole for the insertion and engagement of the tooth 27, by an appendage 33 terminating, via a second connecting elbow 34, in a welding plate 35 with a welding surface parallel to the face 24 but advantageously spaced from the plane of the face 24.
  • the appendage 33 also advantageously has opposed anchoring teeth 48, 49 which engage in suitable seats in the casing for the reasons which will be explained below.
  • the appendage 33 which has to operate as a cantilevered support for the bimetal plate which is subjected to bending stress by a calibration screw, advantageously has a hole 36 which reduces its cross-section and its moment of inertia upon bending and at the same time limits its thermal conductivity and the heat dissipation from the bimetal plate towards the support.
  • the hole 36 may be replaced or combined for the same purpose with a reduction in thickness of the appendage formed by the removal of material or by pressing.
  • the terminal block thus formed is associated with a movable jaw 37 also produced from an elongate, flat blank by successive bending operations which form a rectangular ring linked with the block 20.
  • the upper face 38 of the ring formed by the superimposition of the two ends of the blank has a threaded hole 39 into which the screw 26 is screwed.
  • the screw By pushing with its end against the lower face 22 of the block 20, the screw pulls the upper face 38 of the ring towards the upper face 21 of the block forcing the lower face 40 of the ring alongside the lower face of the block 22 and clamping any interposed lead ends.
  • a resilient tongue 24A is advantageously formed by blanking in the face 24 of the block and interferes with the edge of the upper face 38 of the clamping ring, keeping it in the maximum closure position by friction. This facilitates the use of the terminal as a two-connection terminal, that is, as a terminal which can receive both an electrical terminal between the face 22 of the block and the face 40 of the clamping ring and a flat fork terminal inserted between the head of the screw 26 and the upper face 21 of the block.
  • the casing of the circuit breaker has a hole 70 for admitting the fork terminal.
  • the end 43 of the switching electrode 44 which is also produced by suitable bending from a flat blank, is fixed by the same welding operation on the opposite face of the plate to that which contacts the plate 35.
  • the thickness, and hence the stiffness, of the switching electrode 44 is advantageously less than the stiffness of the appendage 33.
  • the end 46 of a flexible conductive braid 47 is welded electrically near the free end 45 of the bimetal member, its other end being welded electrically to the contact arm 5 which can be assembled in the release device in known manner to form a unitary subassembly which can easily be installed in the casing.
  • the terminal, the bimetal member and the switching electrode thus form an extremely simple and functional thermal protection unit which can be installed in the casing together with the tripping device by only two easy steps of engagement in suitable seats.
  • the appendage 33 has to have a predetermined length since it has to extend from the terminal block to interfere with the calibration screw 12 ( Figure 1).
  • the teeth 29, 30 of the block which are engaged in the casing, act more as supports for a cantilevered member formed by the face 24 and by the appendage 33 than as a fixed joint for the appendage 33.
  • Figure 4 shows in a static diagram the structure thus obtained.
  • the length of the cantilevered appendage 33 is indicated C
  • the length of the teeth 29, 30, which virtually corresponds to the distance of the bearing constraints formed in the casing is indicated l
  • the length l + C is indicated L.
  • the teeth 48, 49 form a bearing constraint much closer to the point of application of the force exerted by the calibration screw, reducing the cantilevered length C.
  • the amplification is limited exclusively by the maximum resilient stresses withstood by the cantilevered appendage and by the economic advantage of using a standard threaded calibration screw rather than a more expensive fine-pitch micrometric screw which might be required in order to reconcile too large an amplification factor with adequate calibration sensitivity.
  • the teeth 48, 49 form a bearing constraint which practically eliminates the undesired pivoting effects induced on the support arm by the mechanical stresses exerted on the terminal by the ends clamped therein.

Landscapes

  • Thermally Actuated Switches (AREA)
  • Breakers (AREA)
  • Fuses (AREA)
  • Protection Of Generators And Motors (AREA)
EP95202803A 1994-10-18 1995-10-17 Selbstschalter mit einem Thermoschutzbauteil Expired - Lifetime EP0708470B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI9530242T SI0708470T1 (en) 1994-10-18 1995-10-17 An automatic circuit breaker with a thermal protection unit

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT94MI002125A IT1275641B1 (it) 1994-10-18 1994-10-18 Gruppo di protezione termica per interruttore automatico
ITMI942125 1994-10-18

Publications (2)

Publication Number Publication Date
EP0708470A1 true EP0708470A1 (de) 1996-04-24
EP0708470B1 EP0708470B1 (de) 1999-01-27

Family

ID=11369728

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95202803A Expired - Lifetime EP0708470B1 (de) 1994-10-18 1995-10-17 Selbstschalter mit einem Thermoschutzbauteil

Country Status (7)

Country Link
EP (1) EP0708470B1 (de)
AT (1) ATE176358T1 (de)
DE (1) DE69507566T2 (de)
ES (1) ES2129750T3 (de)
GR (1) GR3029906T3 (de)
IT (1) IT1275641B1 (de)
SI (1) SI0708470T1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014126644A1 (en) * 2013-02-12 2014-08-21 Eaton Corporation Heater apparatus, circuit interrupter, and related method
CN106997830A (zh) * 2017-01-17 2017-08-01 上海永继电气股份有限公司 一种易于自动化生产的小型断路器
CN108054067A (zh) * 2017-12-06 2018-05-18 俊朗电气有限公司 一种小型自动重合闸

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3265837A (en) * 1964-10-22 1966-08-09 Gen Electric Electric circuit breaker provide with an improved terminal strap for mounting a bimetal element
DE2841004B1 (de) * 1978-09-21 1980-02-14 Licentia Gmbh Leitungsschutzschalter mit zusaetzlicher Blasschleife
DE3514390A1 (de) * 1985-04-20 1986-10-23 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Leitungsschutzschalter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3265837A (en) * 1964-10-22 1966-08-09 Gen Electric Electric circuit breaker provide with an improved terminal strap for mounting a bimetal element
DE2841004B1 (de) * 1978-09-21 1980-02-14 Licentia Gmbh Leitungsschutzschalter mit zusaetzlicher Blasschleife
DE3514390A1 (de) * 1985-04-20 1986-10-23 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Leitungsschutzschalter

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014126644A1 (en) * 2013-02-12 2014-08-21 Eaton Corporation Heater apparatus, circuit interrupter, and related method
US9378916B2 (en) 2013-02-12 2016-06-28 Eaton Corporation Heater apparatus, circuit interrupter, and related method
CN106997830A (zh) * 2017-01-17 2017-08-01 上海永继电气股份有限公司 一种易于自动化生产的小型断路器
CN108054067A (zh) * 2017-12-06 2018-05-18 俊朗电气有限公司 一种小型自动重合闸

Also Published As

Publication number Publication date
ITMI942125A0 (it) 1994-10-18
EP0708470B1 (de) 1999-01-27
ITMI942125A1 (it) 1996-04-18
SI0708470T1 (en) 1999-08-31
GR3029906T3 (en) 1999-07-30
DE69507566T2 (de) 1999-08-26
ES2129750T3 (es) 1999-06-16
ATE176358T1 (de) 1999-02-15
DE69507566D1 (de) 1999-03-11
IT1275641B1 (it) 1997-10-17

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