EP2107588A2 - Schutzschalter - Google Patents

Schutzschalter Download PDF

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Publication number
EP2107588A2
EP2107588A2 EP08016768A EP08016768A EP2107588A2 EP 2107588 A2 EP2107588 A2 EP 2107588A2 EP 08016768 A EP08016768 A EP 08016768A EP 08016768 A EP08016768 A EP 08016768A EP 2107588 A2 EP2107588 A2 EP 2107588A2
Authority
EP
European Patent Office
Prior art keywords
break
circuit breaker
rotor
link
double
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
EP08016768A
Other languages
English (en)
French (fr)
Other versions
EP2107588B1 (de
EP2107588A3 (de
Inventor
Kazumasa Watanabe
Masahiro Fushimi
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP2107588A2 publication Critical patent/EP2107588A2/de
Publication of EP2107588A3 publication Critical patent/EP2107588A3/de
Application granted granted Critical
Publication of EP2107588B1 publication Critical patent/EP2107588B1/de
Ceased legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/20—Bridging contacts
    • H01H1/2041—Rotating bridge
    • H01H1/2058—Rotating bridge being assembled in a cassette, which can be placed as a complete unit into a circuit breaker
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H11/0006—Apparatus or processes specially adapted for the manufacture of electric switches for converting electric switches
    • 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
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/52—Manual reset mechanisms which may be also used for manual release actuated by lever
    • H01H71/522—Manual reset mechanisms which may be also used for manual release actuated by lever comprising a cradle-mechanism
    • H01H71/525—Manual reset mechanisms which may be also used for manual release actuated by lever comprising a cradle-mechanism comprising a toggle between cradle and contact arm and mechanism spring acting between handle and toggle knee
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H2011/0093—Standardization, e.g. limiting the factory stock by limiting the number of unique, i.e. different components

Definitions

  • the present invention relates to a circuit breaker such as a molded case circuit breaker or an earth leakage breaker, and more particularly to standardization of components of a make and break mechanism and unified design on the appearance.
  • a circuit breaker has not only a function of opening or closing the electric path, namely, a switch function, by operating an operation handle provided for this circuit breaker, but also takes a great role of shutting off the electric path to prevent beforehand burning of an electric wire or a load device due to a flow of over-current.
  • This breaking of the electric path is defined in the range from 1kA to 200kA as a "rated breaking current" in the JIS (Japanese Industrial Standards) C8370, for example, and it is well known that each manufacturer have been filling out the product variations so that the circuit breaker having an adequate rated breaking current can be appropriately selected in accordance with the conditions of the electric path, namely, the distance from a transformer and the thickness of electric wire.
  • an arc occurs between so-called one pair of contact points, including the moving contact point and the stationary contact point, but to extinguish this arc rapidly, it is preferable that an arc voltage for maintaining the arc itself is increased.
  • one pair of contact points a so-called single-pole double-break
  • the arc voltage is doubled, and particularly suitable for high breaking capacity products.
  • this single-pole double-break is a circuit breaker in which the power and load side contacts plates are arranged in point symmetry with respect to a revolution center of a revolving contacts plate that has tow moving contact points at both ends, and each of the power and load side contacts plates have a stationary contact point paired with one of the moving contact points (e.g., refer to patent document 1).
  • Patent document 1 JP-A-10-223115 (45th line in right column of page 2 to first line in left column of page 3, Fig. 1 )
  • a constitutional feature of this single-pole double-break (hereinafter referred to as a rote active type) is that the power side moving contact point (number 3) needs to be parted in the opening direction from the bottom surface of the housing because of the exhaust to the load side (right side, on the paper) at the time of breaking.
  • the circuit breaker it is generally required to exert a greater force in the contact point contacting direction than the contact point opening direction to assure the contact reliability between contact points.
  • the arrangement of the main spring at the greatest space efficiency is in the direction of Fig.
  • the toggle link is composed of the upper link and the lower link (in the almost straight line when in the ON as shown, or substantially L-character when in the OFF, not shown).
  • a lifting force in the so-called clockwise or OFF direction
  • a greater pushing force in the so-called counterclockwise or ON direction
  • this arrangement and constitution have the advantage that the higher reliability can be achieved as the products.
  • the point at which the movable contacts plate (hereinafter referred to as a rotor) is driven by the lower link is located on the power side (left side, on the paper) of the revolution axis of this rotor, whereby the make and break mechanism comprising the lower link is naturally closer to the power side of the circuit breaker, and the operation handle is similarly arranged on the power side.
  • circuit breakers are of the rote active type, the "closer to the power side" has almost no problem.
  • the rated breaking capacity is diverse, each manufacturer must produce the breaker at the manufacturing cost according to the rated breaking capacity, namely, as the circuit breaker has the lower rated breaking capacity, the manufacturing cost must be cheaper. Though it is unnecessary that all the circuit breakers are single-pole double-break, a wide assortment of so-called single-pole single-breaks having excellent cost performance are provided in the current situation.
  • this single-pole single-break is also required to improve the breaking performance.
  • the opening distance between contact points is secured by making the movable contact as long as possible. Therefore, the crossbar for holding the movable contact has to be closer to the load side, and accordingly the make and break mechanism comprising the operation handle is arranged almost in the center of the circuit breaker.
  • the single-pole double-break and the single-pole single-break can share the so-called make and break mechanism leading from the operation handle to the lower link, there is complexity that two kinds of accessory units for the operation handle are provided, and further there was a problem that the user-friendliness was worse due to a difference in the appearance design caused by different positions of the operation handle. Also, if the specific make and break mechanism is provided in accordance with the position of the operation handle, the component standardization is worse, and the cost competitiveness is inevitably lost.
  • This invention has been achieved to solve the above-mentioned problems, and it is an object of the invention to provide a circuit breaker of single-pole double-break and single-pole single-break in which the components of a make and breakmechanismare standardized and the position of an operation handle is unified.
  • a circuit breaker comprising a housing; a frame that is fixed to the housing; a movable contact member that has a moving contact point on at least one end; a stationary contact member that has a stationary contact point contacting with or separating from the moving contact point; a holding member for holding the movable contact member; and a make and break mechanism that comprises: a lower link for driving the holding member; a lever that is engaged with a latch of an over-current tripping device, the lever revolving at the time of tripping the circuit breaker; an upper link that is supported on the lever, the upper link coupled with the lower link via a spring pin, the upper link making up a toggle link together with the lower link; a main spring that is coupled with the spring pin on a driven side of the main spring; and a handle arm that has a substantially U-character shape, the handle arm coupled with the main spring on a driving side of the main spring, the handle arm rotatably supported on
  • the invention can provide a cheap circuit breaker that is user-friendly.
  • Figs. 1 to 5 show a single-pole double-break circuit breaker according to an embodiment 1 of the present invention. More particularly, Fig. 1 is an external perspective view with a cover removed, Fig. 2 is a side cross-sectional view in a trip state, Fig. 4 is a side cross-sectional view in the ON state and Fig. 5 is a side cross-sectional view in the OFF state. Fig. 3 is a cross-sectional view taken along the line A-A in Fig. 2 . Fig. 6 is an equivalent view of Fig. 2 showing a single-pole single-break circuit breaker according to the embodiment 1 of the invention.
  • an insulation housing of a single-pole double-break circuit breaker 101 for triple-pole comprises a cover 1 (see Fig. 2 ) and a base 2A.
  • a make and break mechanism 51 having an operation handle 3, a double-break unit case 52 for the number of poles (in this case, triple-pole) and an over-current tripping device 53 are disposed on the base 2A.
  • the operation handle 3 projects out of a handle window hole 1a (see Fig. 2 ) in the cover 1 to allow an operation in the ON or OFF direction, and a power side terminal 4 and a load side terminal 5 are in the positional relationship between the double-break unit case 52 and the over-current tripping device 53, as well known.
  • the double-break unit case 52 is well known, except for a rotor link as will be described later. That is, the double-break unit case has a power side stationary contact member 6 extended from the power side terminal 4 and having a power side stationary contact point 7 at one end, a load side stationary contact member 12 connected via the over-current tripping device 53 to the load side terminal 5 and having a load side stationary contact point 11 at one end, and a movable contact member 9 having the power side and load side moving contact points 8 and 10 contacting with or separating from the power side and load side stationary contacts 7 and 11 at both ends, and held by the rotor 13 of a resin molding, for example, and the arc-extinguishing devices 14 and 15 for extinguishing arc occurring by opening between the power side stationary contact point 7 and the power side moving contact point 8 and between the load side moving contact point 10 and the load side stationary contact point 11, as shown in Fig.
  • the rotor 13 has a contact pressure spring 32 (see Fig. 3 ) for producing a contact pressure between the contact points 7 and 8 and between the contact points 10 and 11, and is connected by a connecting rod, not shown, to revolve the movable contact member 9 of each pole in accordance with the operation of the make and break mechanism 51. That is, the side cross-sectional view of Fig. 2 shows a middle pole in the connection with the make and break mechanism 51 that is the main part of the invention.
  • the make and break mechanism 51 is a so-called unit composed of a handle arm 17 like U-character shape axially supported for free rotation and an operation handle 3 fixed to the handle arm 17 on a frame 16 formed by a pair of opposed frame plates 16A and 16B, as shown in Fig. 1 .
  • a handle arm 17 like U-character shape axially supported for free rotation
  • an operation handle 3 fixed to the handle arm 17 on a frame 16 formed by a pair of opposed frame plates 16A and 16B, as shown in Fig. 1 .
  • the inside of the make and break mechanism 51 is engaged with a latch 18 of the over-current tripping device 53, and comprises a lever 19 axially supported on the frame 16 by a revolution shaft 19a, an upper link 20 axially supported by the lever 19, a lower link 21 coupled via a spring pin 22 with the upper link 20 to make up a toggle link, and a main spring 23 stretched to the spring pin 22 on the driven side 23a (see Fig. 3 ) and to the handle arm 17 on the drive side 23b (see Fig. 3 ).
  • the first point of the invention is that the make and break mechanism 51 as the unit is usable in each of the circuit breaker 101 having the base 2A and the circuit breaker 102 having the base 2B.
  • the make and break mechanism 51 is fixed with the double-break unit case 52 by the first stationary portions 16a1 and 16a2 provided on the frame plate 16A (16B), so that the lower link 21 projecting downward from the frame 16 on the paper is inserted into a revolution hole 52a provided in the double-break unit case 52 and coupled with one end 24a of the rotor link 24.
  • This rotor link 24 has a shape like L-character, with the rotor pin 25 provided in the rotor 13 engaged in a long hole 24b at inflection point.
  • the motion of the lower link 21 is conveyed via the rotor link 24 to the rotor 13.
  • the other end 24c of the rotor link 24, in other words, the power side (right side, on the paper) of the rotor revolution shaft 13a serves as the revolution shaft of the rotor link 24.
  • the over-current tripping device 53 is activated by sensing an over-current in the ON state of Fig. 4 , the latch 18 is revolved by reaction of a trip bar 26 (see Fig. 1 ), releasing engagement between the latch 18 and the lever 19.
  • the lever 19 is always urged clockwise on the paper by the main spring 23, and starts to revolve clockwise around the revolution shaft 19a, as well known.
  • the drive side 23b is moved relatively to the spring pin 22, and finally an upper force begins to act on the spring pin 22, so that the lower link 21 is moved.
  • the operation handle transits from ON to OFF as previously described, and is put in a so-called trip state, as shown in Fig. 2 .
  • the point of application is closer to the supporting point (corresponding to the position of the other end 24c) than the point of force (corresponding to the position of one end 24a), which produces a greater driving force, more particularly, multiplied by L2/L1, where L1 and L2 are distances as shown in Fig. 4 , than the rotor link 24 is not provided, whereby improving the contact reliability of contact points.
  • the rotor pin 25 by changing the position of the rotor pin 25, a subsidiary effect that the adjustment of the load required for contact between the contact points or the adjustment for opening distance between the contact points can be made relatively easily.
  • the make and break mechanism 51 as described above can be also employed in a single-pole single-break circuit breaker 102 for triple poles, as shown in Fig. 6 .
  • the coupling between the make and break mechanism 51 and the double-break unit case 52 is contrived as previously described. That is, stating repeatedly, the rotor link 24 is interposed between the lower link 21 and the rotor 13, and the make and break mechanism 51 is disposed on the load side of the rotor 13, more particularly, in the almost center of the circuit breaker 101, as will be apparent from Fig.
  • the second point of the invention is that the frame plate 16A (16B) is provided with the second stationary portion 16b press-fitted into a concave portion, not shown, of the base 2B having a suitable shape for accommodating the components (stationary contact member 27, movable contact member 28, crossbar 29, movable member receptacle 30, arc-extinguishing device 31 and so on), fixing the make and break mechanism 51 on the base 2B, and coupling the lower link 21 with the crossbar 29, whereby the single-pole single-break circuit breaker 102 different from the single-pole double-break circuit breaker 101 can be formed.
  • One series of operations of the single-pole single-break circuit breaker 102 are well known, and not described here in detail.
  • the aspect of the invention is that the make and break mechanism is shared between double-break and single-break, and the position of the make and break mechanism and the position of the operation handle for both circuit breakers 101 and 102 are unified by taking such policies that the stationary portions are provided commonly on the frame 16 as an outer hull, and the rotor link 24 is interposed in the double-break unit case.
  • the component standardization is achieved, apparent incompatibility when both the circuit breakers 101 and 102 are arranged in parallel is resolved, and, for example, further a handle member and an electric operation unit for the operation handle 3 can be shared, whereby the circuit breaker that is user-friendly and has excellent cost performance can be provided to the user.
  • the circuit breaker has been described above, the invention may be naturally applied to all the breakers of this type, and various variations may be made without departing from the scope of the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Breakers (AREA)
  • Switch Cases, Indication, And Locking (AREA)
EP08016768.7A 2008-03-31 2008-09-24 Schutzschalter Ceased EP2107588B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2008090586A JP4821793B2 (ja) 2008-03-31 2008-03-31 回路遮断器

Publications (3)

Publication Number Publication Date
EP2107588A2 true EP2107588A2 (de) 2009-10-07
EP2107588A3 EP2107588A3 (de) 2010-12-29
EP2107588B1 EP2107588B1 (de) 2016-06-08

Family

ID=40693608

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08016768.7A Ceased EP2107588B1 (de) 2008-03-31 2008-09-24 Schutzschalter

Country Status (3)

Country Link
EP (1) EP2107588B1 (de)
JP (1) JP4821793B2 (de)
CN (1) CN101552159B (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012186065A (ja) * 2011-03-07 2012-09-27 Mitsubishi Electric Corp 回路遮断器
KR101680492B1 (ko) * 2012-10-11 2016-11-28 미쓰비시덴키 가부시키가이샤 회로 차단기
JP5971654B2 (ja) * 2012-11-14 2016-08-17 三菱電機株式会社 回路遮断器
JP6159747B2 (ja) * 2015-02-10 2017-07-05 株式会社Ｎｔｔファシリティーズ 遮断器及び遮断方法
CN111463079B (zh) * 2019-01-18 2024-01-23 施耐德电器工业公司 断路器

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10223115A (ja) 1997-02-10 1998-08-21 Hitachi Ltd 回路遮断器
JP2008090586A (ja) 2006-10-02 2008-04-17 Tsukuba Secure Network Research Co Ltd ウェブサイトの正当性判定支援システム

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3380732B2 (ja) * 1997-12-25 2003-02-24 株式会社日立製作所 回路遮断器
JP3900780B2 (ja) * 2000-03-06 2007-04-04 富士電機機器制御株式会社 回路しゃ断器
DE20111726U1 (de) * 2001-07-14 2002-12-05 Moeller GmbH, 53115 Bonn Schaltschloss für mehrpolige elektrische Schaltgeräte
JP2006228492A (ja) * 2005-02-16 2006-08-31 Fuji Electric Fa Components & Systems Co Ltd 回路遮断器
JP4522362B2 (ja) * 2005-12-21 2010-08-11 三菱電機株式会社 回路遮断器
JP4857881B2 (ja) * 2006-04-14 2012-01-18 富士電機機器制御株式会社 回路遮断器
DE102006059307B3 (de) * 2006-12-15 2008-02-21 Moeller Gmbh Elektrisches Schaltgerät

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10223115A (ja) 1997-02-10 1998-08-21 Hitachi Ltd 回路遮断器
JP2008090586A (ja) 2006-10-02 2008-04-17 Tsukuba Secure Network Research Co Ltd ウェブサイトの正当性判定支援システム

Also Published As

Publication number Publication date
EP2107588B1 (de) 2016-06-08
CN101552159A (zh) 2009-10-07
CN101552159B (zh) 2013-05-08
JP4821793B2 (ja) 2011-11-24
EP2107588A3 (de) 2010-12-29
JP2009245731A (ja) 2009-10-22

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