EP1388158B1 - Circuit breaker mechanism for a rotary contact system - Google Patents
Circuit breaker mechanism for a rotary contact system Download PDFInfo
- Publication number
- EP1388158B1 EP1388158B1 EP01952099A EP01952099A EP1388158B1 EP 1388158 B1 EP1388158 B1 EP 1388158B1 EP 01952099 A EP01952099 A EP 01952099A EP 01952099 A EP01952099 A EP 01952099A EP 1388158 B1 EP1388158 B1 EP 1388158B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- crank
- rotary contact
- circuit breaker
- contact assembly
- shaft
- 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.)
- Expired - Lifetime
Links
Images
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
- H01H71/10—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
- 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
-
- 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
- H01H71/1009—Interconnected mechanisms
- H01H2071/1036—Interconnected mechanisms having provisions for four or more poles
-
- 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
- H01H71/1009—Interconnected mechanisms
Definitions
- the present invention is directed to mechanism for a molded case circuit breaker capable of switching a rotary contact structure between on, off and tripped positions.
- the present invention is directed to a molded case circuit breaker having a mechanism for switching a rotary contact system between on, off and tripped positions.
- United States Patent 5,281,776 ('776) describes a molded case circuit breaker having a toggle type mechanism for switching a rotary contact system.
- This mechanism utilizes a lower linkage that directly attaches to a drive shaft which extends through and rotates the contact system, as is shown in Figure 1 .
- a crank attached to the same drive pin is used to drive another pin that also extends through the contact system. Since the drive shaft passes through the contact system, optimum positioning of this shaft may not be possible which may cause geometric constraints on how much force can be transferred from the switching mechanism to the rotor. This often limits the performance level that a circuit breaker which uses the '776 switching mechanism is able to achieve.
- EP-A-0 555 158 discloses a bell-crank operating mechanism of a moulded case circuit breaker which includes a crank connected to two bars.
- a mechanism for a multi-pole circuit breaker comprises at least one side frame, a crank member being attached for rotation to the side frame and having a first and second end and a first rotary contact assembly mounted for rotation adjacent to the crank.
- a first shaft is connected to the crank first end and the first rotary contact assembly.
- a second shaft is positioned apart from the crank second end and connected to the rotary contact assembly.
- a multipole circuit breaker comprises a base, a first side frame mounted to the base, a crank member being attached for rotation to the side frame and having a first and second end and a first rotary contact assembly mounted for rotation within the base adjacent to the crank.
- a first shaft is connected to the crank first end and the first rotary contact assembly.
- a second shaft is positioned apart from the crank second end and connected to the first rotary contact assembly.
- a circuit breaker mechanism comprises a side frame having a cradle attached thereto.
- a toggle linkage consisting an upper link having a first and second end attaches to the cradle and a lower link attached to the upper link second end by a spring spindle.
- a crank member attached to the side frame attaches to the lower link. The crank provides the output torque generated by the mechanism.
- a first and second shaft extend through a rotor assembly.
- the first shaft connects with the crank to drive the rotor assembly between a closed and open position in response to a change in state of the circuit breaker mechanism.
- the circuit breaker 10 in accordance with the present invention is comprised of a base 22 and a cover 24. Enclosed within the base 22 and cover 24 are four poles 14C, 14L, 14R, 14N each corresponding to a respective phase in an electrical circuit. Each pole 14C, 14L, 14R, 14N contains a rotary contact assembly 16C, 16L, 16R and 16N respectively, capable of carrying and interrupting electrical current. A drive shaft 18 connects the four poles 14C, 14L, 14R, 16N.
- center pole 14C is straddled by a mechanism assembly 12.
- the mechanism 12 connects to the poles 14C, 14L, 14R by the drive shaft 18.
- the poles 14C, 14L, 14R are operable to move between three positions open, closed, or tripped in response to operation of the mechanism 12.
- each pole 14 is made up of a rotor 60 housing a contact arm 26, and a pair of movable contacts are 28, 28'.
- the movable contacts 28,28' mate with the pair of stationary contacts 30, 30' when the mechanism is in the CLOSED position shown.
- the stationary contacts 30, 30' are brazed or welded to a load strap 32 and line strap 34 respectively.
- the rotor 60 pivots on a pin 59 which is either supported by an internal wall (not shown), or a modular cassette (not shown) within the base 22.
- the crank 62 connects the mechanism 12 to the rotor assembly 16C.
- the crank 62 pivots about the pin 61 which is assembled on the side frames 13.
- rotor assemblies 16R, 16L, 16N may be identical to rotor assembly 16C.
- the operation of the rotor assembly 16C operates substantially the same as that described in co-pending United States Patent Application SN 09/087,038 filed May 29, 1998 which is incorporated herein by reference.
- Mechanism 12 consists of a lower link 38 connected to the crank 62 by connector pin 39.
- the opposite end of the lower link 38 from the crank is connected to an upper link 40 by a spring spindle 48.
- the upper link 40 in turn is connected to cradle 42 by pin 56, to which is attached to a latch mechanism (not shown).
- the mechanism spring 50 is connected between the spring spindle 48 and a pin 52 in handle 46. The mechanism 12 is prevented from further counter-clockwise rotation when the pin 58 attached to the upper link 40 comes into contact with the cradle 42.
- the amount of torque that can be generated by the mechanism 12 is determined by the amount force F transferred from mechanism spring 50 through the lower link 38 and the moment arm.
- the moment arm is shown in Figure 3 as the perpendicular distance d.
- the perpendicular distance d is the length of a perpendicular line from the crank pivot 61 to the line of action of the force F. Since torque is the product of the force F times the distance d, it should be apparent that for a given mechanism, the greater the distance d the more torque is generated. This distance d and thus the torque will be maximized when the distance d is coincident with the connecting pin 39.
- the pin 39 only connects the lower link 38 to the crank 62. It should be noted that in prior art mechanisms, the pin 39 was also the drive pin that extended through and connected all the rotors.
- the components of the rotor assembly 16C often do not allow the drive pin to be placed in this optimal position.
- the lower link 38 needs to be decoupled from the drive shaft and the rotor assembly 16C.
- the present invention accomplishes this by attaching the lower link 38 to a crank 62 which in turn transmits the force to the drive shaft 18.
- the drive shaft 18 can then be positioned anywhere on the rotor without effecting the amount of torque the mechanism can create.
- the crank 62 either the rotor assembly 16C, or the mechanism assembly 12 may be optimized without compromising the performance of the other, thus allowing for the maximum amount of flexibility in the design of the circuit breaker while still maintaining optimized subassemblies.
- the handle 46 under normal switching operation, the handle 46, is rotated counter-clockwise to switch the circuit breaker 10 from ON to OFF. As the handle 46 is rotated, the line-of-action of the spring 50 will move from the right side to the left side of the pivot 56. This movement "over-centers" the mechanism 12 and the force stored in the spring causes the mechanism 12 to open the rotor assemblies 16C, 16R, 16L, 16N. This opening movement separates the movable contacts 28, 28' from the stationary contacts 30, 30' thereby preventing any flow of current through the circuit breaker 10.
- the latching mechanism (not shown) is released allowing the cradle 42 to rotate in a clockwise direction.
- the latch and trip unit are similar to United States Patent 4,789,848 which is incorporated herein by reference.
- the resulting movement of the cradle 42 causes the rotor assembly 16C via the upper link 40 and the lower link 38 to rotate separating the movable contacts 28,28' from the stationary contacts 30,30'. The separation of the contacts stops the flow of current through the circuit breaker 10.
- shaft 19 is similar to drive shaft 18 in that it extends through and rotationally connects rotor assemblies 16C, 16L, 16R, and 16N.
- shaft 19 is not connected to the crank 62 which allows it to be connected to the rotor assemblies 16C, 16L, 16R, 16N in any convenient location without effecting the optimal crank loading described herein above.
- the shaft 19 is not attached to the crank 62, significantly greater contact depression has been observed. For example, when the contact depression was measured on a 480V, 600A industrial circuit breaker, the contact depression with the shaft 19 added was as much as 75% greater in the extreme outer pole 14N than that with only the drive shaft 18.
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- Breakers (AREA)
Abstract
Description
- The present invention is directed to mechanism for a molded case circuit breaker capable of switching a rotary contact structure between on, off and tripped positions.
- The present invention is directed to a molded case circuit breaker having a mechanism for switching a rotary contact system between on, off and tripped positions.
- United States Patent
5,281,776 ('776) describes a molded case circuit breaker having a toggle type mechanism for switching a rotary contact system. This mechanism utilizes a lower linkage that directly attaches to a drive shaft which extends through and rotates the contact system, as is shown inFigure 1 . A crank attached to the same drive pin is used to drive another pin that also extends through the contact system. Since the drive shaft passes through the contact system, optimum positioning of this shaft may not be possible which may cause geometric constraints on how much force can be transferred from the switching mechanism to the rotor. This often limits the performance level that a circuit breaker which uses the '776 switching mechanism is able to achieve. -
EP-A-0 555 158 discloses a bell-crank operating mechanism of a moulded case circuit breaker which includes a crank connected to two bars. - Therefore, it is desirable to optimize the switching mechanism to transmit an increased amount of force to a rotary contact system.
- It is also considered desirable in conjunction with the improved switching mechanism to describe an interface between the mechanism and the contact system that allows for flexibility in the placement and design of the mechanism.
- In accordance with the present invention, a mechanism for a multi-pole circuit breaker comprises at least one side frame, a crank member being attached for rotation to the side frame and having a first and second end and a first rotary contact assembly mounted for rotation adjacent to the crank. A first shaft is connected to the crank first end and the first rotary contact assembly. A second shaft is positioned apart from the crank second end and connected to the rotary contact assembly.
- Also in accordance with the present invention, a multipole circuit breaker comprises a base, a first side frame mounted to the base, a crank member being attached for rotation to the side frame and having a first and second end and a first rotary contact assembly mounted for rotation within the base adjacent to the crank. A first shaft is connected to the crank first end and the first rotary contact assembly. A second shaft is positioned apart from the crank second end and connected to the first rotary contact assembly.
- A circuit breaker mechanism is provided that comprises a side frame having a cradle attached thereto. A toggle linkage consisting an upper link having a first and second end attaches to the cradle and a lower link attached to the upper link second end by a spring spindle. A crank member attached to the side frame attaches to the lower link. The crank provides the output torque generated by the mechanism.
- A first and second shaft extend through a rotor assembly. The first shaft connects with the crank to drive the rotor assembly between a closed and open position in response to a change in state of the circuit breaker mechanism.
- Other advantages and features will become more clearly apparent from the following description of an illustrative embodiment of the invention, given as a nonrestrictive example only and represented in the accompanying drawings, in which:
-
Figure 1 is a cross-sectional view of a prior art mechanism in the closed position. -
Figure 2 is a top perspective view of a circuit breaker in accordance with the present invention. -
Figure 3 is a front plan view of the elements of the present invention as illustrated inFigure 2 in the CLOSED position. -
Figure 4 is a front plan view of the elements of the present invention as illustrated inFigure 2 in the OPEN position. -
Figure 5 is a front plan view of the elements of the present invention as illustrated inFigure 2 in the TRIPPED position. - Referring now to
Figure 2 , thecircuit breaker 10 in accordance with the present invention is comprised of abase 22 and acover 24. Enclosed within thebase 22 andcover 24 are fourpoles pole rotary contact assembly drive shaft 18 connects the fourpoles - In addition, the
center pole 14C is straddled by amechanism assembly 12. Themechanism 12 connects to thepoles drive shaft 18. Thepoles mechanism 12. - As is seen in
Figure 3 , each pole 14 is made up of arotor 60 housing acontact arm 26, and a pair of movable contacts are 28, 28'. Themovable contacts 28,28' mate with the pair ofstationary contacts 30, 30' when the mechanism is in the CLOSED position shown. Thestationary contacts 30, 30' are brazed or welded to aload strap 32 andline strap 34 respectively. Therotor 60 pivots on apin 59 which is either supported by an internal wall (not shown), or a modular cassette (not shown) within thebase 22. Thecrank 62 connects themechanism 12 to therotor assembly 16C. Thecrank 62 pivots about thepin 61 which is assembled on theside frames 13. It should be appreciated that the rotor assemblies 16R, 16L, 16N may be identical torotor assembly 16C. The operation of therotor assembly 16C operates substantially the same as that described in co-pending United States Patent ApplicationSN 09/087,038 filed May 29, 1998 -
Mechanism 12 consists of alower link 38 connected to thecrank 62 byconnector pin 39. The opposite end of thelower link 38 from the crank is connected to anupper link 40 by aspring spindle 48. Theupper link 40 in turn is connected tocradle 42 bypin 56, to which is attached to a latch mechanism (not shown). Themechanism spring 50 is connected between thespring spindle 48 and apin 52 inhandle 46. Themechanism 12 is prevented from further counter-clockwise rotation when thepin 58 attached to theupper link 40 comes into contact with thecradle 42. - The amount of torque that can be generated by the
mechanism 12 is determined by the amount force F transferred frommechanism spring 50 through thelower link 38 and the moment arm. The moment arm is shown inFigure 3 as the perpendicular distance d. The perpendicular distance d is the length of a perpendicular line from thecrank pivot 61 to the line of action of the force F. Since torque is the product of the force F times the distance d, it should be apparent that for a given mechanism, the greater the distance d the more torque is generated. This distance d and thus the torque will be maximized when the distance d is coincident with the connectingpin 39. In the present invention, thepin 39 only connects thelower link 38 to thecrank 62. It should be noted that in prior art mechanisms, thepin 39 was also the drive pin that extended through and connected all the rotors. - The components of the
rotor assembly 16C often do not allow the drive pin to be placed in this optimal position. For example, as seen inFigure 3 , if thepin 39 is used as the drive shaft to connect all the rotor assemblies, then it would need to pass directly through thecontact arm 26. Thus, if an optimized mechanism arrangement is desired, thelower link 38 needs to be decoupled from the drive shaft and therotor assembly 16C. The present invention accomplishes this by attaching thelower link 38 to acrank 62 which in turn transmits the force to thedrive shaft 18. Thedrive shaft 18 can then be positioned anywhere on the rotor without effecting the amount of torque the mechanism can create. By using thecrank 62, either therotor assembly 16C, or themechanism assembly 12 may be optimized without compromising the performance of the other, thus allowing for the maximum amount of flexibility in the design of the circuit breaker while still maintaining optimized subassemblies. - Referring to
Figure 4 , under normal switching operation, thehandle 46, is rotated counter-clockwise to switch thecircuit breaker 10 from ON to OFF. As thehandle 46 is rotated, the line-of-action of thespring 50 will move from the right side to the left side of thepivot 56. This movement "over-centers" themechanism 12 and the force stored in the spring causes themechanism 12 to open therotor assemblies movable contacts 28, 28' from thestationary contacts 30, 30' thereby preventing any flow of current through thecircuit breaker 10. - When an abnormal condition is detected by a circuit breaker trip unit (not shown), the latching mechanism (not shown) is released allowing the
cradle 42 to rotate in a clockwise direction. The latch and trip unit are similar to United States Patent4,789,848 which is incorporated herein by reference. The resulting movement of thecradle 42 causes therotor assembly 16C via theupper link 40 and thelower link 38 to rotate separating themovable contacts 28,28' from thestationary contacts 30,30'. The separation of the contacts stops the flow of current through thecircuit breaker 10. - It should be appreciated that large loads are applied to the
drive shaft 18 by themechanism 12 and therotor assemblies circuit breaker 10 is in the closed position. These loads tend to either deflect thedrive shaft 18, or twist therotor assemblies shaft 18 tends to greatly reduce the either the contact depression, or the contact pressure between thestationary contact 30, 30' and themoveable contacts second shaft 19 is added to provide the additional strength. - Referring to
Figures 2 and3 ,shaft 19 is similar to driveshaft 18 in that it extends through and rotationally connectsrotor assemblies shaft 19 is not connected to the crank 62 which allows it to be connected to therotor assemblies shaft 19 is not attached to the crank 62, significantly greater contact depression has been observed. For example, when the contact depression was measured on a 480V, 600A industrial circuit breaker, the contact depression with theshaft 19 added was as much as 75% greater in the extreme outer pole 14N than that with only thedrive shaft 18. - Although a preferred embodiment of this invention has been described, many variations and modifications will now be apparent to those skilled in the art, and it is therefore preferred that the instant invention be limited not by the specific disclosure herein but only by the following claims.
Claims (4)
- A mechanism for a multi-pole circuit breaker comprising:at least one side frame (13);a crank member (62) being attached for rotation to said side frame (13) and having a first and second end;a first rotary contact assembly (16C) mounted for rotation adjacent to said crank (62);a first shaft (18) connected to said crank (62) first end and said first rotary contact assembly (16C);characterised by:a second shaft (19) connected to said first rotary contact assembly (16C) and connected to a second rotary contact assembly (16L) adjacent to said first rotary contact assembly (16C) and connected to said first (18) and second (19) shafts, the second shaft (19) not being connected to the crank (62) such that the crank (62) can be connected to the rotary assemblies at any convenient location without effecting the optimal crank loading.
- The mechanism of claim 1 further comprising:a third rotary contact assembly (16R) adjacent to said first rotary contact assembly (16C) and connected to said first (18) and second (19) shafts.
- The mechanism of claim 2 further comprising:a fourth rotary contact assembly (16N) adjacent to said third rotary contact assembly (16R) and connected to said first (18) and second (19) shafts.
- A multipole circuit breaker comprising:a base (22); anda mechanism for a multi-pole circuit breaker according to any preceding claim.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US2001/007271 WO2002082487A1 (en) | 2001-04-09 | 2001-04-09 | Circuit breaker mechanism for a rotary contact system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1388158A1 EP1388158A1 (en) | 2004-02-11 |
EP1388158B1 true EP1388158B1 (en) | 2008-09-10 |
Family
ID=21742381
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01952099A Expired - Lifetime EP1388158B1 (en) | 2001-04-09 | 2001-04-09 | Circuit breaker mechanism for a rotary contact system |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1388158B1 (en) |
CN (1) | CN1199215C (en) |
MX (1) | MXPA01011428A (en) |
WO (1) | WO2002082487A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4395022B2 (en) * | 2004-07-13 | 2010-01-06 | 三菱電機株式会社 | Circuit breaker |
KR100662752B1 (en) * | 2005-10-04 | 2007-01-02 | 엘에스산전 주식회사 | Multi pole circuit breaker |
KR100689324B1 (en) * | 2005-10-05 | 2007-03-08 | 엘에스산전 주식회사 | Multi pole circuit breaker |
US7800007B2 (en) * | 2007-06-26 | 2010-09-21 | General Electric Company | Circuit breaker subassembly apparatus |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4789848A (en) * | 1987-09-03 | 1988-12-06 | General Electric Company | Molded case circuit breaker latch and operating mechanism assembly |
FR2682531B1 (en) * | 1991-10-15 | 1993-11-26 | Merlin Gerin | MULTIPOLAR CIRCUIT BREAKER WITH SINGLE POLE BLOCKS. |
FR2687249B1 (en) * | 1992-02-07 | 1994-04-01 | Merlin Gerin | CONTROL MECHANISM OF A MOLDED BOX CIRCUIT BREAKER. |
US6114641A (en) * | 1998-05-29 | 2000-09-05 | General Electric Company | Rotary contact assembly for high ampere-rated circuit breakers |
-
2001
- 2001-04-09 MX MXPA01011428A patent/MXPA01011428A/en unknown
- 2001-04-09 CN CN01800498.9A patent/CN1199215C/en not_active Expired - Fee Related
- 2001-04-09 EP EP01952099A patent/EP1388158B1/en not_active Expired - Lifetime
- 2001-04-09 WO PCT/US2001/007271 patent/WO2002082487A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
WO2002082487A1 (en) | 2002-10-17 |
MXPA01011428A (en) | 2003-08-20 |
EP1388158A1 (en) | 2004-02-11 |
CN1404614A (en) | 2003-03-19 |
CN1199215C (en) | 2005-04-27 |
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