CA1310046C - Circuit breaker contact assembly - Google Patents
Circuit breaker contact assemblyInfo
- Publication number
- CA1310046C CA1310046C CA000550113A CA550113A CA1310046C CA 1310046 C CA1310046 C CA 1310046C CA 000550113 A CA000550113 A CA 000550113A CA 550113 A CA550113 A CA 550113A CA 1310046 C CA1310046 C CA 1310046C
- Authority
- CA
- Canada
- Prior art keywords
- contact
- movable blade
- circuit breaker
- blade
- operating mechanism
- 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
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
- H01H73/04—Contacts
-
- 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
- H01H1/22—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact
Abstract
Abstract A circuit breaker having a movable upper blade with a free floating pivot end. The operating mechanism is solidly connected to the Upper blade. The contact force is generated by a contact spring which exerts an upward force on the lower blade. No other resilient force acts directly upon the upper blade. As the contacts separate, the force exerted on the upper blade is virtually eliminated, reducing substantially the resistance at the pivot end of the upper blade. The load terminal and pivot end of the upper blade provide a current path parallel to that of the load side flexible connector.
Description
~ 3 ~ 6 CIRC~IT BREAKER CONTACT ASSEMBLY
This inventlon relates to circuit breakers and in particular to circuit breakers having a movable contact mounted on a pivotable blade.
Description of the Prior Art Circuit breakers often have a moving contact mounted on a fixed pivotable blade that is controlled by an operating mechanism. In some designs a pair of links are directly connected to the movable blade to open and close the circuit breaker contacts.
As the current carried by the circuit breaker increases, constriction forces between the contacts may cause the contacts to blow apart. This problem is eliminated by increasing the contact force in any one of a number of ways. One method used in the prior art is to place a flat spring and/or coil spring between the movable blade and the blade carrier. The lower contact exerts an upward force on the moving contacts at the right end of the movable blade. The flat spring positioned between the blade carrier and movable blade exerts a consistent downward force near the middle of the movable blade. Since the operating mechanism is connected the blade carrier and controls the position of the movable blade via the flat spring, the flat spring acts as the pivot point for the movable blade. After applying forces to the movable blade, the resultant force is exerted by the line terminal upwards on the pivot end of the movable blade. At all times, even as the movable blade opens, an upwards force will be exerted against the pivot point of the movable blade because of the springs trying to forc0 apart the movable blade ar.d the blade carrier. This upwards force wears down both the load terminal and ~i ~
- .
This inventlon relates to circuit breakers and in particular to circuit breakers having a movable contact mounted on a pivotable blade.
Description of the Prior Art Circuit breakers often have a moving contact mounted on a fixed pivotable blade that is controlled by an operating mechanism. In some designs a pair of links are directly connected to the movable blade to open and close the circuit breaker contacts.
As the current carried by the circuit breaker increases, constriction forces between the contacts may cause the contacts to blow apart. This problem is eliminated by increasing the contact force in any one of a number of ways. One method used in the prior art is to place a flat spring and/or coil spring between the movable blade and the blade carrier. The lower contact exerts an upward force on the moving contacts at the right end of the movable blade. The flat spring positioned between the blade carrier and movable blade exerts a consistent downward force near the middle of the movable blade. Since the operating mechanism is connected the blade carrier and controls the position of the movable blade via the flat spring, the flat spring acts as the pivot point for the movable blade. After applying forces to the movable blade, the resultant force is exerted by the line terminal upwards on the pivot end of the movable blade. At all times, even as the movable blade opens, an upwards force will be exerted against the pivot point of the movable blade because of the springs trying to forc0 apart the movable blade ar.d the blade carrier. This upwards force wears down both the load terminal and ~i ~
- .
- 2 - 00219-611/PA/GWH/fs the pivot end oE the blade. The wearing oE the terminal and the blade increases the resistance and the power loss oE the circuit breaker. The power loss of a circuit breaker is particularly important when the circuit breaker is mounted in a panelboard or other enclosure having specific heat rise limitations.
According to one aspect of the present invention, there is provided a circuit breaker comprising: a first contact mounted on a first movable blade, the first movable blade having a curved surface cooperating with a stationary flat load contact terminal surface to form a floating pivot adjacent to one end; a second contact mounted on a second movable blade; an operating mechanism connected to the first movable blade, said operating mechanism moving said Eirst movable blade between an open position and a closed position, wherein in said open position said first contact and said second contact are separated, wherein in said closed position said Eirst contact and said second contact are engaged; a resilient member acting on the second movable blade to move said second contact toward said first contact; said resilient member supplying the sole contact pressure between said first contact and said second contact; and a first flexible connector, said first flexible connector being connected to said first terminal and to said first movable blade; said floating pivot being under substantially zero loading when said Eirst contact and said second contact are in said open position.
~ 3 ~
According to one aspect of the present invention, there is provided a circuit breaker comprising: a first contact mounted on a first movable blade, the first movable blade having a curved surface cooperating with a stationary flat load contact terminal surface to form a floating pivot adjacent to one end; a second contact mounted on a second movable blade; an operating mechanism connected to the first movable blade, said operating mechanism moving said Eirst movable blade between an open position and a closed position, wherein in said open position said first contact and said second contact are separated, wherein in said closed position said Eirst contact and said second contact are engaged; a resilient member acting on the second movable blade to move said second contact toward said first contact; said resilient member supplying the sole contact pressure between said first contact and said second contact; and a first flexible connector, said first flexible connector being connected to said first terminal and to said first movable blade; said floating pivot being under substantially zero loading when said Eirst contact and said second contact are in said open position.
~ 3 ~
- 3 - 00219-611/PA/GWH/fs Brlef Description of the Drawinas Figure l is a side view of a portion of the contact assembly and mechanism of a circuit breaker.
Figure 2 is a side view of a portion of the contact assembly and operating mechanism of a prior art circuit breaker.
Figure 3 is a side view of a moving blade pivot assembly of Figure 2.
Figure 4 is a side view of a circuit breaker having a floating pivot blade in the closed position.
Figure 5 is a side view of a circuit breaker having a floating pivot blade in the manually opened position.
Figure 6 is a side view of a circuit breaker having a floating pivot blade in the tripped position.
Descri~tion of the Preferred Embodiment Referring now the drawings and in particular to Figures 4 and 5, the circuit breaker is indicated generally by the reference character 10. The current path through the circuit breaker is via the load terminal 12, load side flexible connector 14, upper blade 16, moving main contact 18 and moving arcing contact, lower main and arcing contacts 22 and 24, respectively, lower blade 26, line side flex connector 28 and line terminal 30. The contacts are open and closed by moving the upper blade 16 via the operating mechanism, indicated generally as 34.
It will be noted that in the circuit breaker closed position, as shown in Figure 4, the upper link 36 and the lower link 38 form a nearly straight line to force the upper blade 16 and the upper blade carrier 40 down. The moving main contacts 18 and moving arcing contact then engage the lower main contacts 22 and , 13~ ~13~6 -4~
lower accing contact 24, d~pressing the ~ontact spclngs 44 tO provide the nece66arY contact focce The contact 6pcings 44 are the only comeonents that creates contact rOrce In the c~rcuit breaker clo~ed position, the lower main and arcing contact~, Z2 and 24, respectively, exert an upwards ~orce on the rlght ~ide of the upper blade 16 via the moving main and arcing contact6, as 6hown in Pigure 4 The lower link 38 exert6 a downwards force near the center of the upper blade 16 vta the upper blade carrier 40 The upper blade carcier 40 i6 ~oltdly connected to the upper blade 16 The upper blade 16 is approximately rectan~ular in shape an~ has ~oving ma~n contact6 18 and a mov~ng arclng contact mounted at one end and a rounded plvot e~d 46 at lS the other end The pivot end 46 re~ts on a le~ge 48 of the load terminal 12 The pivot end 46 of the u~per blade 16 i~ ~ree ~loating and does not rotate about a ~ixed ~oint When the circu1t breaker i~ in the closed po6ition, a~ ~hown in Ftgure 4, the ~ownwards ~orc- exerted by the low-r ltnk 38 and tho upwacds ~orce exerted by the lower main and arcing contacts create a ce6ultant downward~
rOcce exected by tho pivot end 46 on tho ledge 48 Since the lower llnk rorce 1~ applie~ in approxtmately the ~iddle Or t~e upper blade 16, the upward6 ~orce at the contact~ n~ o~ th- upper blade 16 i6 appeoxlmately equal to the downward~ ~orc- exerte~ by the pivot end 46 When the ctrcult breaker i6 either manually opened or tripped, as ~hown in ~tgures 5 and 6, re6pectlvely, the operattng mechani6m 34 cau~es the ueper link 36 and lower link 38 to collap~e The link pivot S0 movos to the l-~t, a~ ~hown ln ~iguc-~ 5 and 6, causlng the lower link 3~ to mov- the upper blade carrier 40 and upp-r blade 16 ln the up~ard~ ~irection The other components o~ the operatlng mechanism have dt~eFent po6itlon6 in the tripped po~ltlon , , .
~ 3 ~ 6 than in the manually opened po6ition. It i8 ~u~icient for the purpo6e6 herein ~o recognize that ln both positions the upper llnk 36 and lower link 3a collapse.
causing the contacts ~o separate.
In the tripped or open po~itlon, the re6ultant ~orce on the pivot end 46 i8 greatly reducad, essentially to zero, as 600n a~ the contacts part. In the~e po6i~ion~, the upper link 36 and lower link 3~ hold the upper blade 16 open 80 that the only downward~ ~orce Qn the moving blade pivot end 46 is a portion of its own weight and any downward bia~ from the flex connectors 14. Ae 600n as the moving contacts separate6 ~rom the lower main contact6 22 and lower arcing contact 24, the contact ~pring 44 no longer exerts a force on the upper blade 16. There is no downwards force on the upper blade a6 that which resulted ~rom the ~lat ~pring between the upper blade and the upper blade carrier in the prior art. Fo~ the greater portion Or the opening cycle, there is little force on pivot end 46 o~ the upper blade 16, greatly reducing the wear on the ~ivot end, The load term~nal ledge 4~ and the pivot end 46 provide a current path parallel to that o~ the line 6ite ~lexlble connector 14, In the de~ign as ~hown, eoughly hal~ o~ the cUrrent ~low~ through each current path, thu6 reducing the power lo~s ant heat rise. In the circuit breaker ~hown and te~cribed herein, the overall heat 106g o~ the circuit ~rea~er was reduced by approximately ten percent by the u~e o~ the two parallel path6.
The pivot end 46 and load t~rmlnal ledge 4a provide a current path between the load terminal 12 and upper blade 16 via a pressure ~it. ~he pres6ure connection between these two current carrying member~ mu~t be a~
~mooth a~ pos~ible. Any wear on the plvot end 46 or on the load terminal ledge 48 wil~ cause that ~oint to 3s deteriorate, resulting ln a higher resi~tance in that 1 3 ~
current path. The part dimen~ions o the load tarminal and upper blade are ccitlcal when a ~ixed pivot iB used but not w~th the u~e of the ~loating pivot de~ign.
The upper blade 16 i8 maae of copper or another material ha~ing a low electrical resistance. Since the~e materlals also often aee relatively sofc, the pivot end 46 of the upper blade 16 weae~ very poorly. Thu~ it i8 lmportant to reduce the upwards force on the pivot as quickly and as much as po6sible. By elim~nating the prior art 8prin~ po~itioned between the upper blade carrier 40 and the upper blade 16, the downwards force previously ap~lled by the blade ~pring to the u~per blade continuously is elim~nated as soon a~ the contacts ~art.
~he wear on the pivot ond 46 1~ reduced consideeably. The wattE lost through the circuit brea~ec will stay approxl~ately con6tant during the life of the circuit breaker. ~he ~loating pivot design i~ a 6im~1e and lnexpen~ive ~olution to a recurring problem.
While the invention has particulaely been shown and zo d-rcrlbod wlth reference to a preferred embodiment it wlll be underrtood by those skllled in the art that vaeiations ln ~orm, consteuction and arrangement may be made thorein wlthout teparting ~eom the ~plrlt and scope o~ the lnventlon.
, . , ., . ~ .
Figure 2 is a side view of a portion of the contact assembly and operating mechanism of a prior art circuit breaker.
Figure 3 is a side view of a moving blade pivot assembly of Figure 2.
Figure 4 is a side view of a circuit breaker having a floating pivot blade in the closed position.
Figure 5 is a side view of a circuit breaker having a floating pivot blade in the manually opened position.
Figure 6 is a side view of a circuit breaker having a floating pivot blade in the tripped position.
Descri~tion of the Preferred Embodiment Referring now the drawings and in particular to Figures 4 and 5, the circuit breaker is indicated generally by the reference character 10. The current path through the circuit breaker is via the load terminal 12, load side flexible connector 14, upper blade 16, moving main contact 18 and moving arcing contact, lower main and arcing contacts 22 and 24, respectively, lower blade 26, line side flex connector 28 and line terminal 30. The contacts are open and closed by moving the upper blade 16 via the operating mechanism, indicated generally as 34.
It will be noted that in the circuit breaker closed position, as shown in Figure 4, the upper link 36 and the lower link 38 form a nearly straight line to force the upper blade 16 and the upper blade carrier 40 down. The moving main contacts 18 and moving arcing contact then engage the lower main contacts 22 and , 13~ ~13~6 -4~
lower accing contact 24, d~pressing the ~ontact spclngs 44 tO provide the nece66arY contact focce The contact 6pcings 44 are the only comeonents that creates contact rOrce In the c~rcuit breaker clo~ed position, the lower main and arcing contact~, Z2 and 24, respectively, exert an upwards ~orce on the rlght ~ide of the upper blade 16 via the moving main and arcing contact6, as 6hown in Pigure 4 The lower link 38 exert6 a downwards force near the center of the upper blade 16 vta the upper blade carrier 40 The upper blade carcier 40 i6 ~oltdly connected to the upper blade 16 The upper blade 16 is approximately rectan~ular in shape an~ has ~oving ma~n contact6 18 and a mov~ng arclng contact mounted at one end and a rounded plvot e~d 46 at lS the other end The pivot end 46 re~ts on a le~ge 48 of the load terminal 12 The pivot end 46 of the u~per blade 16 i~ ~ree ~loating and does not rotate about a ~ixed ~oint When the circu1t breaker i~ in the closed po6ition, a~ ~hown in Ftgure 4, the ~ownwards ~orc- exerted by the low-r ltnk 38 and tho upwacds ~orce exerted by the lower main and arcing contacts create a ce6ultant downward~
rOcce exected by tho pivot end 46 on tho ledge 48 Since the lower llnk rorce 1~ applie~ in approxtmately the ~iddle Or t~e upper blade 16, the upward6 ~orce at the contact~ n~ o~ th- upper blade 16 i6 appeoxlmately equal to the downward~ ~orc- exerte~ by the pivot end 46 When the ctrcult breaker i6 either manually opened or tripped, as ~hown in ~tgures 5 and 6, re6pectlvely, the operattng mechani6m 34 cau~es the ueper link 36 and lower link 38 to collap~e The link pivot S0 movos to the l-~t, a~ ~hown ln ~iguc-~ 5 and 6, causlng the lower link 3~ to mov- the upper blade carrier 40 and upp-r blade 16 ln the up~ard~ ~irection The other components o~ the operatlng mechanism have dt~eFent po6itlon6 in the tripped po~ltlon , , .
~ 3 ~ 6 than in the manually opened po6ition. It i8 ~u~icient for the purpo6e6 herein ~o recognize that ln both positions the upper llnk 36 and lower link 3a collapse.
causing the contacts ~o separate.
In the tripped or open po~itlon, the re6ultant ~orce on the pivot end 46 i8 greatly reducad, essentially to zero, as 600n a~ the contacts part. In the~e po6i~ion~, the upper link 36 and lower link 3~ hold the upper blade 16 open 80 that the only downward~ ~orce Qn the moving blade pivot end 46 is a portion of its own weight and any downward bia~ from the flex connectors 14. Ae 600n as the moving contacts separate6 ~rom the lower main contact6 22 and lower arcing contact 24, the contact ~pring 44 no longer exerts a force on the upper blade 16. There is no downwards force on the upper blade a6 that which resulted ~rom the ~lat ~pring between the upper blade and the upper blade carrier in the prior art. Fo~ the greater portion Or the opening cycle, there is little force on pivot end 46 o~ the upper blade 16, greatly reducing the wear on the ~ivot end, The load term~nal ledge 4~ and the pivot end 46 provide a current path parallel to that o~ the line 6ite ~lexlble connector 14, In the de~ign as ~hown, eoughly hal~ o~ the cUrrent ~low~ through each current path, thu6 reducing the power lo~s ant heat rise. In the circuit breaker ~hown and te~cribed herein, the overall heat 106g o~ the circuit ~rea~er was reduced by approximately ten percent by the u~e o~ the two parallel path6.
The pivot end 46 and load t~rmlnal ledge 4a provide a current path between the load terminal 12 and upper blade 16 via a pressure ~it. ~he pres6ure connection between these two current carrying member~ mu~t be a~
~mooth a~ pos~ible. Any wear on the plvot end 46 or on the load terminal ledge 48 wil~ cause that ~oint to 3s deteriorate, resulting ln a higher resi~tance in that 1 3 ~
current path. The part dimen~ions o the load tarminal and upper blade are ccitlcal when a ~ixed pivot iB used but not w~th the u~e of the ~loating pivot de~ign.
The upper blade 16 i8 maae of copper or another material ha~ing a low electrical resistance. Since the~e materlals also often aee relatively sofc, the pivot end 46 of the upper blade 16 weae~ very poorly. Thu~ it i8 lmportant to reduce the upwards force on the pivot as quickly and as much as po6sible. By elim~nating the prior art 8prin~ po~itioned between the upper blade carrier 40 and the upper blade 16, the downwards force previously ap~lled by the blade ~pring to the u~per blade continuously is elim~nated as soon a~ the contacts ~art.
~he wear on the pivot ond 46 1~ reduced consideeably. The wattE lost through the circuit brea~ec will stay approxl~ately con6tant during the life of the circuit breaker. ~he ~loating pivot design i~ a 6im~1e and lnexpen~ive ~olution to a recurring problem.
While the invention has particulaely been shown and zo d-rcrlbod wlth reference to a preferred embodiment it wlll be underrtood by those skllled in the art that vaeiations ln ~orm, consteuction and arrangement may be made thorein wlthout teparting ~eom the ~plrlt and scope o~ the lnventlon.
, . , ., . ~ .
Claims (5)
1. A circuit breaker comprising:
a first contact mounted on a first movable blade, the first movable blade having a curved surface cooperating with a stationary flat load contact terminal surface to form a floating pivot adjacent to one end;
a second contact mounted on a second movable blade;
an operating mechanism connected to the first movable blade, said operating mechanism moving said first movable blade between an open position and a closed position, wherein in said open position said first contact and said second contact are separated, wherein in said closed position said first contact and said second contact are engaged;
a resilient member acting on the second movable blade to move said second contact toward said first contact;
said resilient member supplying the sole contact pressure between said first contact and said second contact; and a first flexible connector, said first flexible connector being connected to said first terminal and to said first movable blade;
said floating pivot being under substantially zero loading when said first contact and said second contact are in said open position.
a first contact mounted on a first movable blade, the first movable blade having a curved surface cooperating with a stationary flat load contact terminal surface to form a floating pivot adjacent to one end;
a second contact mounted on a second movable blade;
an operating mechanism connected to the first movable blade, said operating mechanism moving said first movable blade between an open position and a closed position, wherein in said open position said first contact and said second contact are separated, wherein in said closed position said first contact and said second contact are engaged;
a resilient member acting on the second movable blade to move said second contact toward said first contact;
said resilient member supplying the sole contact pressure between said first contact and said second contact; and a first flexible connector, said first flexible connector being connected to said first terminal and to said first movable blade;
said floating pivot being under substantially zero loading when said first contact and said second contact are in said open position.
2. A circuit breaker as claimed in claim 1 wherein said operating mechanism is operably connected to said first movable blade.
00219-611/PA/GWH/fs
00219-611/PA/GWH/fs
3. A circuit breaker as claimed in claim 1 wherein said operating mechanism is operably connected to said first movable blade.
4. A circuit breaker comprising:
a first contact mounted on a first movable blade, said first movable blade having a curved surface at one end;
a second contact mounted on a second movable blade;
an operating mechanism connected to said first movable blade for moving said first movable blade between an open position wherein said first contact and said second contact are separated and a closed position wherein said first contact and said second contact are engaged;
a spring urging said second contact into engagement with said first contact and providing the sole force acting on said contacts in said closed position, whereby substantially zero loading is applied to said one end of said first movable blade in said open position;
a load terminal forming a stationary flat surface;
a flexible connector interconnecting said load terminal with said first movable blade; and said curved surface and said stationary flat surface cooperating to form a floating pivot for said first movable blade, said first movable blade being conductive and said floating pivot completing a parallel conductive path between said load terminal and said first movable blade.
a first contact mounted on a first movable blade, said first movable blade having a curved surface at one end;
a second contact mounted on a second movable blade;
an operating mechanism connected to said first movable blade for moving said first movable blade between an open position wherein said first contact and said second contact are separated and a closed position wherein said first contact and said second contact are engaged;
a spring urging said second contact into engagement with said first contact and providing the sole force acting on said contacts in said closed position, whereby substantially zero loading is applied to said one end of said first movable blade in said open position;
a load terminal forming a stationary flat surface;
a flexible connector interconnecting said load terminal with said first movable blade; and said curved surface and said stationary flat surface cooperating to form a floating pivot for said first movable blade, said first movable blade being conductive and said floating pivot completing a parallel conductive path between said load terminal and said first movable blade.
5. A circuit breaker of the type including a first contact carried by a contact carrier and a second contact, an operating mechanism for moving said contact carrier to bring said first 00219-611/PA/GWH/fs contact into engagement with said second contact, said first contact including a contact arm having a curved end for mechanically and electrically engaging a load terminal surface in a floating pivot, the improvement comprising:
spring means for urging said second contact towards said first contact, said spring means providing the sole contact pressure when the circuit breaker is in the closed condition and resulting in said floating pivot experiencing substantially zero loading when said circuit breaker is in an open condition.
spring means for urging said second contact towards said first contact, said spring means providing the sole contact pressure when the circuit breaker is in the closed condition and resulting in said floating pivot experiencing substantially zero loading when said circuit breaker is in an open condition.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US92257686A | 1986-10-24 | 1986-10-24 | |
| US06/922,576 | 1986-10-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1310046C true CA1310046C (en) | 1992-11-10 |
Family
ID=25447246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000550113A Expired - Lifetime CA1310046C (en) | 1986-10-24 | 1987-10-23 | Circuit breaker contact assembly |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0296183B1 (en) |
| CA (1) | CA1310046C (en) |
| DE (1) | DE3784065T2 (en) |
| WO (1) | WO1988003324A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2709251B2 (en) * | 1992-02-27 | 1998-02-04 | 寺崎電気産業株式会社 | Draw-out type circuit breaker |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2600223A (en) * | 1944-11-10 | 1952-06-10 | Westinghouse Electric Corp | Circuit interrupter |
| US3593227A (en) * | 1968-02-28 | 1971-07-13 | Gennady Fedosievich Mitskevich | Automatic electrodynamic blowoff breaker with stationary contact form of two series wound u-shaped members |
| US4259651A (en) * | 1978-10-16 | 1981-03-31 | Westinghouse Electric Corp. | Current limiting circuit interrupter with improved operating mechanism |
| IE56136B1 (en) * | 1983-12-19 | 1991-04-24 | Westinghouse Electric Corp | Circuit breaker with improved cross-bar and contact assembly |
| US4598263A (en) * | 1984-11-13 | 1986-07-01 | Westinghouse Electric Corp. | Magnetically operated circuit breaker |
| JPH0658785B2 (en) * | 1985-06-12 | 1994-08-03 | 株式会社東芝 | Circuit breaker |
| US4680562A (en) * | 1985-07-29 | 1987-07-14 | Westinghouse Electric Corp. | Integral circuit interrupter with separable modules |
| US4626811A (en) * | 1985-10-15 | 1986-12-02 | Westinghouse Electric Corp. | Circuit interrupter with integral resilient stop means for contact arm |
-
1987
- 1987-10-23 CA CA000550113A patent/CA1310046C/en not_active Expired - Lifetime
- 1987-10-23 EP EP19870907568 patent/EP0296183B1/en not_active Expired - Lifetime
- 1987-10-23 DE DE19873784065 patent/DE3784065T2/en not_active Expired - Fee Related
- 1987-10-23 WO PCT/US1987/002830 patent/WO1988003324A1/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| WO1988003324A1 (en) | 1988-05-05 |
| DE3784065T2 (en) | 1993-07-15 |
| EP0296183A1 (en) | 1988-12-28 |
| EP0296183A4 (en) | 1990-02-26 |
| EP0296183B1 (en) | 1993-02-03 |
| DE3784065D1 (en) | 1993-03-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |