EP3140846B1 - Moulded case circuit breaker and method for assembling the same - Google Patents

Moulded case circuit breaker and method for assembling the same Download PDF

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Publication number
EP3140846B1
EP3140846B1 EP15736654.3A EP15736654A EP3140846B1 EP 3140846 B1 EP3140846 B1 EP 3140846B1 EP 15736654 A EP15736654 A EP 15736654A EP 3140846 B1 EP3140846 B1 EP 3140846B1
Authority
EP
European Patent Office
Prior art keywords
case
circuit breaker
moulded
contact
case circuit
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
EP15736654.3A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3140846A1 (en
Inventor
Roberto Boffelli
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
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BTicino SpA
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Publication date
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Publication of EP3140846A1 publication Critical patent/EP3140846A1/en
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Publication of EP3140846B1 publication Critical patent/EP3140846B1/en
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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
    • H01H71/0207—Mounting or assembling the different parts of the circuit breaker
    • H01H71/0221—Majority of parts mounted on central frame or wall
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/20—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition
    • H01H83/22—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition the other condition being unbalance of two or more currents or voltages
    • H01H83/226—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition the other condition being unbalance of two or more currents or voltages with differential transformer

Definitions

  • the present disclosure refers to the technical field of electrical installations and, more particularly, regards a moulded case circuit breaker and a method for assembling the same.
  • a moulded case circuit breaker as opposed to a circuit breaker of the so-called "open" type, has a housing made of insulating material that, in addition to providing protection against external agents, supports the internal circuits and mechanisms of the circuit breaker and terminals for connection to the external line and load circuits.
  • moulded case circuit breakers are generally used as protective devices in the fields of electrical distribution, industrial automation and advanced service fields to interrupt currents having, for example, a value up to 3200 A.
  • Some manufacturers in the industry provide the market different types of moulded case circuit breakers with different functions, since, for example, the market requires various types of moulded case circuit breakers, each of which can be equipped or not with an internal residual current protection device.
  • One possible type of moulded case circuit breaker is, for example, an automatic circuit breaker with magnetothermic type trip system, which, in practice, comprises only electromechanical devices.
  • Another possible type of moulded case circuit breaker is, for example, an automatic circuit breaker with electronic type trip system, wherein the trip system is interlocked with an electronic control. Therefore, a single manufacturer must have different production lines, which results in relatively high product production and management costs.
  • the belong to the state of the prior art includes solutions that associate to a moulded case circuit breaker an external residual current protection module connectable to one of the two arrays of electric connection terminals of the moulded case circuit breaker, which makes the final assembly relatively bulky because, for example, there is a significant increase in the height of the final assembly compared to the height of only the moulded case circuit breaker.
  • the solution described above is also relatively expensive as it requires the purchase of two separate units, each having their own case, which must be electrically interconnected.
  • the document FR 2 681 725 A1 discloses a moulded case circuit breaker according to the preamble of claim 1. The purpose of this disclosure is to provide a moulded case circuit breaker such as to overcome the drawbacks mentioned above with reference to the moulded case circuit breakers of the prior art.
  • moulded case circuit breaker as generally defined in claim 1.
  • Preferred and advantageous embodiments of said moulded case circuit breaker are defined in the appended dependent claims.
  • the moulded case circuit breaker 1 is a multipolar circuit breaker and, in particular, a tripolar circuit breaker. According to a variant embodiment, the moulded case circuit breaker 1 is a four-pole circuit breaker. However, the teachings of this description also extend to a moulded case circuit breaker 1 having a different number of poles, for example unipolar or bipolar.
  • circuit breaker 1 is, as in the example shown in the figures, a multipolar moulded case circuit breaker.
  • the moulded case circuit breaker 1 comprises a first case 10, made of an electrically insulating material such as, for example, a resin, and a second case 20 coupled to the first case 10, also made of an electrically insulating material such as a resin.
  • the above cases 10 and 20 are formed, for example, by injection moulding, in two pieces separate from each other.
  • the moulded case circuit breaker 1 comprises at least one fastening element 31,32 adapted to couple and maintain the first 10 and the second 20 cases stably fixed to each other. It is preferable to provide a plurality of fastening elements 31,32.
  • the at least one fastening element 31,32 is adapted to removably couple the two cases 10,20, and, for example, is embodied by one or more screws 31,32 or in one or more pairs of screws 31,32.
  • the at least one fixing element 31,32 is an irreversible fixing element and, for example, is embodied by at least one rivet.
  • a plurality of fastening elements are provided in the form of screws or pairs of screws 31 that, passing through the first case 10, are inserted in suitable seats 42 of the second case 20 and in the form of screws or pairs screws 32 that, passing through first the second housing 20, are inserted in suitable seats 41 provided in the first housing 10.
  • the first case 10 comprises a first case portion 11 and a second case portion 12 made in two separate pieces, for example by injection moulding, and coupled together.
  • the second case portion 12 is operatively interposed between the first case portion 11 and the second case 20.
  • the first case 10 comprises a lid 13 removably coupled to the first case portion 11.
  • the lid 13 is, for example, coupled to the first case portion 11 by means of screws that, passing through the lid 13, are inserted in respective screwing seats provided in the first case portion 11.
  • the first case 10 comprises a front face 4 and a rear face 5 opposite to the front face and the second case 20 is coupled to the first case 10 from the side the said rear face 5.
  • front face means the face of the first case 10 that, during normal use of the circuit breaker, is facing the operator and is opposite to an installation wall, for example the wall of an electrical switchboard.
  • the rear face 5 of the first case 10 has a protruding portion 6 and a recessed portion 7 that define a step
  • the second case 20 is arranged above said protruding portion 6 at the recessed portion 7 for levelling said step and imparting a general outer shape of rectangular parallelepiped to the assembly formed by the first case 10 and the second case 20.
  • the first case 10 has a section that, in a plane perpendicular to the rear face 5, is essentially L-shaped; in this regard, note L-shape of the first case 10 visible in Figures 5 and 12 .
  • the second case 20 is preferably shaped like a half-shell with a quadrangular plan or generally quadrangular.
  • the moulded case circuit breaker 1 also comprises a manual control device 3, such as a rotary control lever 3.
  • the manual control device 3 can be alternately moved between two positions corresponding, respectively, to an operational state of opening and an operational state of closing of the moulded case circuit breaker 1.
  • the manual control device 3 for example, passes through an opening provided in the first case 10.
  • the manual control device 3 passes through an opening defined in the first portion 11 of the first case 10 and an opening defined in the lid 13.
  • the manual control device 3 projects from the front face 4 of the first case 10.
  • the manual control device 3 can also be actuated by a motorized device coupled to the moulded case circuit breaker, for example as shown in Figure 5 of European patent EP 2001036 B1 .
  • the manual control device 3 is operatively connected to an actuating mechanism housed and supported by the first case 10 and adapted to determine the switching of the moulded case circuit breaker 1 between the two operating states of opening and closing.
  • an actuating mechanism may include levers, elastic elements, connecting rods, a rotary actuating mechanism 15 (visible in Figures 9 and 10 ) as well as, for example, described in European patent EP 2259278 B1 , etc. From now on, the actuating mechanism will be indicated with the reference 15 to indicate the whole through one of its parts.
  • the moulded case circuit breaker 1 comprises at least a first contact branch C1 comprising at least a first contact element P1 and at least a first support element S1 of the first contact element P1, at least a first connection terminal T1 electrically connected to, or integrated into, the first support element S1.
  • the actuating mechanism 15 of the first support element S1 adapted to move the latter so that the first contact element P1 can be moved from a rest position (shown in Figure 9 ) to a working position (shown in Figure 10 ) and vice versa.
  • the first case 10 houses and supports the first contact branch C1 and the actuating mechanism 15. In other words, the first case 10 houses and supports the first contact branch C1 and the actuating mechanism 15.
  • the moulded case circuit breaker 1 comprises a second contact branch C2 comprising at least a second contact element P2, adapted to be contacted by the first contact element P1 when this is in the working position, at least a second support element S2 of the second contact element P2 and at least a second connection terminal T2 electrically connected to, or integrated into, the second support element S2.
  • the second case 20 houses and supports the second contact branch C2. In other words, the second case 20 performs a supporting function for the second contact branch C2.
  • the at least one first contact branch C1 and the at least one second contact branch C2 each comprise a plurality of contact branches, each associated with a respective phase of the moulded case circuit breaker 1.
  • the actuating mechanism 15 be common to the different contact branches and that it be controlled by a common actuating element 3.
  • the first contact element P1 and the second contact element P2 are pads made of a highly conductive material, such as sintered silver alloy.
  • the first connection terminal T1 and the second connection terminal T2 comprise two portions of bar conductor axially aligned with each other along an axis of alignment Z-Z.
  • said bar conductors bar are conductors with quadrangular and, preferably, rectangular section.
  • bar conductor means a conductor with a cross-section such as to ensure a certain rigidity to the conductor as opposed to relatively flexible conductors such as wires, cables, or wire threads.
  • the first support element S1 is an electrically conductive arm rotatably hinged, directly or indirectly, to the first case 10 to be rotated about an axis of rotation between two angularly spaced positions corresponding respectively to the rest position and the working position of the first contact element P1.
  • these positions correspond respectively to the operating state of opening and to the operating state of closing of the moulded case circuit breaker 1.
  • the first support element S1 is a conductive arm bound to the rotary actuating element 15 and the latter is rotatably hinged to the first case 10, is supported by it and is made of electrically insulating material.
  • this bond between the conductive arm and the rotary actuating element 15 provides, in any case, and in a manner known per se, a possibility of residual movement of the rotary arm and, therefore, of the first support element S1 with respect to the rotary actuating element 15, for example to recover the wear of the contact elements P1, P2, or to compensate for any misalignment.
  • each of these is equipped with a first support element S1 and all the first support elements S1 are preferably bound to the same rotary actuating element 15 and to the same actuating mechanism.
  • the first contact branch C1 comprises a bar conductor 18 having an end portion, for example, provided with a through hole, which is the first connection terminal T1.
  • the terminal T1 is a part of, or is electrically connected to, a connecting terminal not shown in the figures.
  • the bar conductor 18 is electrically connected to the first support element S1 via a flexible conductive thread 16, directly or by interposition of a conductive fastening plate 17 to which one end of said flexible braid 16 is welded.
  • the conductive fastening plate 17 is, for example, riveted to the bar conductor 18.
  • the second contact element P2 is a fixed contact element and comprises a pad and the second support element S2 comprises a bar conductor 28 fastened to said second case 20 and having a first end portion to which said pad P2 is welded and a second opposite end portion which represents said second connection terminal T2.
  • said bar conductor 28 is essentially hook-shaped.
  • the terminal T2 is a part of, or is electrically connected to, a connecting terminal not shown in the figures.
  • the second case 20 also comprises at least one block made of insulating material 22, for example removably coupled to the second case 20, placed below the second contact element P2 and below the end portion of the second support element which carries the second contact element P2 and having the function of stiffening said end portion and which is preferably adapted to clamp the second support element S2 against a wall of the second case 20, for example through a fastening element 23 in the form of a screw.
  • the moulded case circuit breaker 1 comprises at least one guidance element of the electric arc 24 made of C-shaped or U-shaped ferromagnetic material, for example of the type generally described in European patent EP 1998349 B1
  • the block made of insulating material 22 allows maintaining such guidance element of the electric arc 24 in place.
  • the second case 20 also serves as the support and fastening base for the guidance element of the electric arc 24.
  • the first case 10 includes an arc extinguishing chamber 19 housing a deionization cell 8 and having an opening 9 facing towards the second case 20 and the second case 20 includes at least one compartment communicating with said extinguishing chamber 19 through said opening 9 adapted to receive the expansion of the gases developed upon the occurrence of an electric arc.
  • the spaces available in the second case 20 are advantageously exploited for the expansion of the gases that develop upon the occurrence of an electric arc between the contact elements P1, P2, which implies an increase in the performance of the moulded case circuit breaker 1 in terms of breaking capacity and/or in terms of robustness over time to the wear phenomena related to electric arcs.
  • the first case comprises an automatic protection system with a trip system adapted to bring said first contact element P1 in the rest position upon detecting a condition of short-circuit or overcurrent.
  • the body of knowledge of an expert in the field includes the various types of trip systems, both of the fully electromechanical type (automatic magnetothermic circuit breakers) and interlocked with an electronic control (automatic electronic circuit breakers).
  • the moulded case circuit breaker 1 includes a second housing 20 as shown in Figures 4 , 5 , 7 and 8 , the moulded case circuit breaker 1 is an automatic, magnetic or electronic circuit breaker without a residual current protection system.
  • first case 10 is a single module that can be fitted with accessories in different ways and that, coupled to a second module that can be of different types and that is represented by second housing 20 and by what this supports, allows producing a wide range of types of moulded case circuit breakers.
  • the measuring toroid 50 may be connected to the trip device, directly or by interposition of an electronic control module housed in the first case, by passing at least two conductors, each connected to a respective terminal of the measuring toroid 50, from the second case 20 to the first case 10.
  • the measuring toroid 50 may be connected to the trip device, directly or by interposition of an electronic control module housed in the first case, by passing at least two conductors, each connected to a respective terminal of the measuring toroid 50, from the second case 20 to the first case 10.
  • a removable lid 52 coupled to the rear face 5 of the first case 10.
  • each of the contact branches C2 housed in the second case 20 and supported by this comprises a first bar conductor 28', a second bar conductor 28'' and an electric connection element 28"' between the first 28' and second 28'' bar conductor that crosses the measuring toroid 50.
  • the first 28' and second 28'' bar conductor are fixed to the second case 20 by means of screws
  • the third bar conductor 28''' is a rigid conductor bar having an end portion riveted, or otherwise attached and electrically connected, to the first conductor bar 28' and an opposite end portion, riveted, or otherwise attached and electrically connected, to the second conductor bar 28''.
  • such insulating blocks 22 stiffen the second support element S2 and, possibly, keep in place the guidance elements of the electric arc 24, if these are provided, as in Figure 13 .
  • such insulating blocks 22 do not perform the function of fixing the second support S2 to the second case 20, contrary to what has been described for the examples of Figures 7 and 8 .
  • moulded case circuit breaker 1 also corresponds to the description of a method for assembling a moulded case circuit breaker 1 comprising the steps of:
  • the aforementioned assembly method greatly reduces the production costs of a wide range of moulded case circuit breakers, with great benefit to both manufacturers and purchasers.
  • the aforementioned assembly method also includes a step of connecting at least one electrical signal cable between the first case and the second case by passing it inside said cases.
  • a step of connecting at least one electrical signal cable between the first case and the second case by passing it inside said cases in this way, it is possible, for example, to wire an element contained in the second case, such as, for example, the measuring toroid, to a trip or control device housed in the first case.
EP15736654.3A 2014-05-07 2015-04-20 Moulded case circuit breaker and method for assembling the same Active EP3140846B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITRM20140227 2014-05-07
PCT/IT2015/000108 WO2015170354A1 (en) 2014-05-07 2015-04-20 Moulded case circuit breaker and method for assembling the same

Publications (2)

Publication Number Publication Date
EP3140846A1 EP3140846A1 (en) 2017-03-15
EP3140846B1 true EP3140846B1 (en) 2018-07-18

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Application Number Title Priority Date Filing Date
EP15736654.3A Active EP3140846B1 (en) 2014-05-07 2015-04-20 Moulded case circuit breaker and method for assembling the same

Country Status (6)

Country Link
EP (1) EP3140846B1 (ru)
CN (1) CN105097369B (ru)
CL (1) CL2016002813A1 (ru)
RU (1) RU2660912C2 (ru)
TR (1) TR201815193T4 (ru)
WO (1) WO2015170354A1 (ru)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201700084076A1 (it) * 2017-07-24 2019-01-24 Bticino Spa Elemento di copertura ed azionamento e placca di copertura per il montaggio a parete di apparecchi elettrici modulari
CN110993446B (zh) * 2019-12-31 2020-12-18 纳图智能科技(常州)有限公司 一种塑壳断路器生产制造组装装配机械

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5276416A (en) * 1991-09-20 1994-01-04 Kabushiki Kaisha Toshiba Circuit breaker
RU2110103C1 (ru) * 1996-03-19 1998-04-27 Российский Федеральный Ядерный Центр - Всероссийский Научно-Исследовательский Институт Экспериментальной Физики Пружинный механизм выключателя
ITMI20012586A1 (it) * 2001-12-10 2003-06-10 Abb Service Srl Polo elettrico per un interruttore di potenza di bassa tensione, e relativo interruttore
JP4251092B2 (ja) * 2004-02-23 2009-04-08 パナソニック電工株式会社 回路遮断器
JP4650023B2 (ja) * 2005-02-25 2011-03-16 富士電機機器制御株式会社 回路遮断器
AT505602A1 (de) * 2006-09-01 2009-02-15 Moeller Gebaeudeautomation Gmb Schaltgerät
JP5402378B2 (ja) * 2009-08-11 2014-01-29 富士電機機器制御株式会社 回路遮断器

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
CN105097369A (zh) 2015-11-25
EP3140846A1 (en) 2017-03-15
CN105097369B (zh) 2018-12-28
RU2016142719A3 (ru) 2018-06-08
RU2016142719A (ru) 2018-06-08
WO2015170354A1 (en) 2015-11-12
TR201815193T4 (tr) 2018-11-21
CL2016002813A1 (es) 2017-02-17
RU2660912C2 (ru) 2018-07-11

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