EP0168888A2 - Ultrarapid-release current-limiter electrical switch - Google Patents
Ultrarapid-release current-limiter electrical switch Download PDFInfo
- Publication number
- EP0168888A2 EP0168888A2 EP85201125A EP85201125A EP0168888A2 EP 0168888 A2 EP0168888 A2 EP 0168888A2 EP 85201125 A EP85201125 A EP 85201125A EP 85201125 A EP85201125 A EP 85201125A EP 0168888 A2 EP0168888 A2 EP 0168888A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- lever
- arm
- movable
- contact
- movable unit
- 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.)
- Withdrawn
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H77/00—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
- H01H77/02—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
- H01H77/10—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening
- H01H77/102—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening characterised by special mounting of contact arm, allowing blow-off movement
- H01H77/104—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening characterised by special mounting of contact arm, allowing blow-off movement with a stable blow-off position
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/24—Electromagnetic mechanisms
- H01H71/2418—Electromagnetic mechanisms combined with an electrodynamic current limiting mechanism
- H01H2071/2427—Electromagnetic mechanisms combined with an electrodynamic current limiting mechanism with blow-off movement tripping mechanism, e.g. electrodynamic effect on contacts trips the traditional trip device before it can unlatch the spring mechanism by itself
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/24—Electromagnetic mechanisms
- H01H71/2418—Electromagnetic mechanisms combined with an electrodynamic current limiting mechanism
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/42—Induction-motor, induced-current, or electrodynamic release mechanisms
-
- 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
Definitions
- the object of the present invention is a ultrarapid-release current-limiter switch.
- the instantaneous opening of the contacts is automatically caused, in case of heavy current overloads due to short-circuits, by the repulsive electrodynamic forces produced by the flow of strong currents of opposite sign inside two portions parallel and suitably close to each other of the current path connecting the movable and stationary contacts of the switch at the power supply and load terminals, said parallel portions being normally constituted by the same supports of the movable contacts and of the stationary contacts.
- a current-limiter electrical switch as above briefly set forth is known, e.g., from the German Patent N° 2443771 and from the German Patent Application publ. N° 33 36 207.
- the opening of the contacts by means of the intervention of the release device occurs, in these known switches, as mentioned above, with a certain delay which may result too long for certain practical application requirements. This is due to the fact that the release device is controlled, through suitable mechanisms, by said thermomagnetic devices, so that it has not been possible to date to shorten the intervention times of the release device under certain limits.
- Purpose of the present invention is to provide a current-limiter electrical switch of the type with contact l opening by rodynamic repulsion in case of heavy current overloads, wherein the release, i.e., the ultimate and long-lasting opening contact, is obtained within still shorter times.
- This purpose is achieved according to the invention in that a direct link is provided interplaced between the movable contact bearing arm and the final release device of the control mechanism suitable to cause the release directly upon a shift of the movable contact bearing arm by electrodynamic repulsion.
- Said direct link interplaced between the movable contact bearing arm and the final release device may be simply constituted by a thrust rod assembled in the movable unit supporting the movable contact bearing unit and onto which this latter acts when it is displaced by the repulsive electrodynamic forces in contrast to the action of elastic means, said rod acting in its turn either directly or through a lever on the final element of the release device of the control mechanism of the movable unit.
- FIG. 1 and 2 are schematic views of a pole of the switch respectively with the contacts closed and with the contacts shown in the first step of the opening movement caused by electrodynamic repulsion.
- the schematically illustrated switch pole comprises generally a first terminal 10, e.g., connected to the power supply, and a second terminal 11, e.g., connected to a load.
- a conductor 12 is connected which ends with U-bent portion 13 bearing a stationary contact 14.
- a movable unit 16 is rotatably assembled wherein an arm 18 bearing a movable contact 19 is supported in a rotatable way around a spindle 17.
- thermomagnetic release devices known, schematically indicated in 22 and 23.
- the current path, on stationary contact 14 and movable contact 19 closed, comprises hence two portions parallel and close to each other, constituted by the bent portion 13 of the conductor 12 and by the arm 18 bearing the movable contact 19, along which portions currents of opposite sign flow.
- thermo-magnetic release devices 22 and 23 are inserted in series.
- This mechanism comprises a control lever 24 pivoted in 25 and linked, through a a toggle lever, to the movable unit 16.
- the toggle lever is formed by two links 26 and 27 hinged to each other in 28.
- the free end of the link 26 is hinged in 29 to the movable unit 16, whilst the free end of the link 27 is hinged in 30 to a lever 31 hinged in 32.
- an extension spring 34 acts between the hinge 28 connecting the two links 26 and 27 and a point 33 of the control lever 24 .
- the lever 31 with its point 35 is suitable to abut against a stop 36 constituted by a step of a rotary shaft 37 bearing an arm 38 solid with it.
- the shaft 37 with its step-shaped stop 36 and with the arm 18 form a release device for the lever 31, which device can be driven by the thermomagnetic release devices 22, 23, through interposed mechanical means, of which a rod 39 is schematically shown suitable to act on the arm 38 to cause the shaft 37 to rotate and thus disengage the stop 36 from the point 35 of the lever 31.
- the force of the spring 34 via the lever 31 fulcrumed on the rotation pivot 32 brings the toggle lever system 26 and 27 back into the open-contact position.
- the structure of the switch as it has been herein described is substantially that of the known art and the operating way is also known, including that of the thermomagnetic release devices and of the release devices of the con trol mechanism.
- the intervention of the release device as obtained in this way requires a certain time, which for particular practical needs may be excessive. This time may be acceptable when the opening of the contacts of the switch is caused by the intervention of the thermic release device and/or of the mag netic release device, i.e. due to currents higher than the calibration currents of the switch, but not high enough as to produce such repulsive electrodynamic forces as to cause the separation of the movable contact bearing arm from the stationary contact, indipendently from a shift ⁇ o( the movable unit on to which the movable contact bearing arm is mounted.
- the present invention intervenes, which envisages the control of the release device directly by the movable contact bearing arm due to a shift of the same caused by said repulsive electrodynamic forces.
- the present invention provides to this purpose a thrust rod 40 slidingly assembled inside the movable unit 16 and associated with the arm 18 bearing the movable contact 19.
- This rod 40 is moreover provided with a concentric spring 41 acting between a shoulder on the movable unit 16 and a small disk 42 solid with the rod 40, in contact with a lever 43 hinged in 44 to the movable unit 16, which lever 43, to the purpose of exerting the necessary pressure on the contacts is pressed in its turn against an idle roller 45 mounted on the rear edge of the arm 18 bearing the movable contact 19.
- the free end of the thrust rod 40 is extended outwards from the movable unit 16 and is suitable to act on the arm of a bell crank 46, pivoted in 47, the other arm of which cooperates with a second arm 48 solid with the shaft 37 of the release device.
- the control mechanism is capable of holding the movable unit 16 in its position in which the switch contacts are closed.
- the arm 18 bearing the movable contact 19 is displaced in contrast with the force of the spring 41 by the repulsive electrodynamic forces (see fig. 2), said arm acts, through the roller 45 and the lever 43, on the thrust rod 40 so as to cause it to protrude outwards from the movable unit 16 to a greater extent, whereby its free end exerts a thrust on the bell crank 46, causing it to rotate clockwise, so as to act on the arm 48 and to cause the shaft 37 to rotate counterclockwise, thus clearing the stop step 36 of the point of the lever 31.
- the release occurs of the control device and by the action of the spring 34 and with the contribution of the repulsive electrodynamic forces the movable unit 16 is brought to the opening position of switch contacts.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Breakers (AREA)
Abstract
Description
- The object of the present invention is a ultrarapid-release current-limiter switch.
- In a switch of this type, the instantaneous opening of the contacts is automatically caused, in case of heavy current overloads due to short-circuits, by the repulsive electrodynamic forces produced by the flow of strong currents of opposite sign inside two portions parallel and suitably close to each other of the current path connecting the movable and stationary contacts of the switch at the power supply and load terminals, said parallel portions being normally constituted by the same supports of the movable contacts and of the stationary contacts. To that purpose, it is known to assemble the movable contacts supporting arms rotatably and in an elastically yielding fashion in a movable unit which can be moved, by means of a control mechanism, due to a direct manual intervention or to a remote intervention, from an open-contact position to a closed-contact position and vice-versa. Inside said current path comprising said parallel portions close to each other, devices are moreover inserted in series which are sensible to the low- and medium-intensity currents and are generally of thermic and/or magnetic type, suitable to act, in case of abnormally high current overloads, on a control mechanism release device, to automatically cause the displacement of said movable unit to the open-contact position. This automatic release is usually less rapid than the contact opening caused by said repulsive electrodynamic forces.
- A current-limiter electrical switch as above briefly set forth is known, e.g., from the German Patent N° 2443771 and from the German Patent Application publ. N° 33 36 207. The opening of the contacts by means of the intervention of the release device occurs, in these known switches, as mentioned above, with a certain delay which may result too long for certain practical application requirements. This is due to the fact that the release device is controlled, through suitable mechanisms, by said thermomagnetic devices, so that it has not been possible to date to shorten the intervention times of the release device under certain limits.
- Purpose of the present invention is to provide a current-limiter electrical switch of the type with contact l opening by rodynamic repulsion in case of heavy current overloads, wherein the release, i.e., the ultimate and long-lasting opening contact, is obtained within still shorter times.
- This purpose is achieved according to the invention in that a direct link is provided interplaced between the movable contact bearing arm and the final release device of the control mechanism suitable to cause the release directly upon a shift of the movable contact bearing arm by electrodynamic repulsion.
- Thanks to this direct action on the release device by the movable contact bearing arm, it has been possible it to considerably shorten the total circuit-opening time, and namely up to one third of the time to date required by the known switches of this type.
- Said direct link interplaced between the movable contact bearing arm and the final release device may be simply constituted by a thrust rod assembled in the movable unit supporting the movable contact bearing unit and onto which this latter acts when it is displaced by the repulsive electrodynamic forces in contrast to the action of elastic means, said rod acting in its turn either directly or through a lever on the final element of the release device of the control mechanism of the movable unit.
- An embodiment of the switch according to the invention shall be described in more detail hereinunder with reference to the attached drawings, wherein Figs. 1 and 2 are schematic views of a pole of the switch respectively with the contacts closed and with the contacts shown in the first step of the opening movement caused by electrodynamic repulsion.
- As it is seen in the drawing, the schematically illustrated switch pole comprises generally a
first terminal 10, e.g., connected to the power supply, and asecond terminal 11, e.g., connected to a load. To the terminal 10 aconductor 12 is connected which ends withU-bent portion 13 bearing astationary contact 14. - Around a pivot 15 a
movable unit 16 is rotatably assembled wherein anarm 18 bearing amovable contact 19 is supported in a rotatable way around aspindle 17. - To the second terminal 11 a
conductor 21 is connected which is in its turn electrically connected to thearm 18 through thermomagnetic release devices known, schematically indicated in 22 and 23. The current path, onstationary contact 14 andmovable contact 19 closed, comprises hence two portions parallel and close to each other, constituted by thebent portion 13 of theconductor 12 and by thearm 18 bearing themovable contact 19, along which portions currents of opposite sign flow. Moreover, in said current path the thermo-magnetic release devices - In order to bring the
movable unit 16 into the position of closure and into the position of opening of thecontacts - This mechanism comprises a
control lever 24 pivoted in 25 and linked, through a a toggle lever, to themovable unit 16. The toggle lever is formed by twolinks link 26 is hinged in 29 to themovable unit 16, whilst the free end of thelink 27 is hinged in 30 to alever 31 hinged in 32. Between thehinge 28 connecting the twolinks point 33 of the control lever 24 anextension spring 34 acts. Thelever 31 with itspoint 35 is suitable to abut against astop 36 constituted by a step of arotary shaft 37 bearing anarm 38 solid with it. Theshaft 37 with its step-shaped stop 36 and with thearm 18 form a release device for thelever 31, which device can be driven by thethermomagnetic release devices rod 39 is schematically shown suitable to act on thearm 38 to cause theshaft 37 to rotate and thus disengage thestop 36 from thepoint 35 of thelever 31. In this case, the force of thespring 34 via thelever 31 fulcrumed on therotation pivot 32 brings thetoggle lever system - The structure of the switch as it has been herein described is substantially that of the known art and the operating way is also known, including that of the thermomagnetic release devices and of the release devices of the con trol mechanism.
- Unfortunately, as it has been set forth, the intervention of the release device as obtained in this way requires a certain time, which for particular practical needs may be excessive. This time may be acceptable when the opening of the contacts of the switch is caused by the intervention of the thermic release device and/or of the mag netic release device, i.e. due to currents higher than the calibration currents of the switch, but not high enough as to produce such repulsive electrodynamic forces as to cause the separation of the movable contact bearing arm from the stationary contact, indipendently from a shift \ o( the movable unit on to which the movable contact bearing arm is mounted.
- On the contrary, when the instantaneous opening of the contacts is caused, under conditions of very strong current intensities due to a short-circuit, by the repulsive electrodynamic forces, the intervention time of the release device to the purpose of bringing also the mobile unit into the opening position may result too long for determined needs, if the control of said release device takes place through the normal thermomagnetic release devices.
- At this point the present invention intervenes, which envisages the control of the release device directly by the movable contact bearing arm due to a shift of the same caused by said repulsive electrodynamic forces.
- In fact, the present invention provides to this purpose a
thrust rod 40 slidingly assembled inside themovable unit 16 and associated with thearm 18 bearing themovable contact 19. Thisrod 40 is moreover provided with aconcentric spring 41 acting between a shoulder on themovable unit 16 and asmall disk 42 solid with therod 40, in contact with alever 43 hinged in 44 to themovable unit 16, which lever 43, to the purpose of exerting the necessary pressure on the contacts is pressed in its turn against anidle roller 45 mounted on the rear edge of thearm 18 bearing themovable contact 19. The free end of thethrust rod 40 is extended outwards from themovable unit 16 and is suitable to act on the arm of abell crank 46, pivoted in 47, the other arm of which cooperates with asecond arm 48 solid with theshaft 37 of the release device. - When, with the contacts being closed (see fig. 1), the
arm 18 bearing themovable contact 19 is in its normal operating position under the action of thespring 41, thethrust rod 40 does not exert any actions on thebell crank 46 and thelever 31 is stopped by thestep 36 of theshaft 37. The control mechanism is capable of holding themovable unit 16 in its position in which the switch contacts are closed. - When, on the contrary, due to a very strong current intensity due to a short circuit, the
arm 18 bearing themovable contact 19 is displaced in contrast with the force of thespring 41 by the repulsive electrodynamic forces (see fig. 2), said arm acts, through theroller 45 and thelever 43, on thethrust rod 40 so as to cause it to protrude outwards from themovable unit 16 to a greater extent, whereby its free end exerts a thrust on thebell crank 46, causing it to rotate clockwise, so as to act on thearm 48 and to cause theshaft 37 to rotate counterclockwise, thus clearing thestop step 36 of the point of thelever 31. In such a way, the release occurs of the control device and by the action of thespring 34 and with the contribution of the repulsive electrodynamic forces themovable unit 16 is brought to the opening position of switch contacts. - Practical tests have shown that, thanks to this direct control of the release device by the movable contact bearing arm, the total circuit-opening time can be reduced down to about one third of the time needed when the release is controlled by the traditional thermomagnetic release devices of the known art.
Claims (4)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT2261684U | 1984-07-18 | ||
IT2261684U IT8422616V0 (en) | 1984-07-18 | 1984-07-18 | ELECTRIC SWITCH CURRENT LIMITER WITH ULTRA-QUICK RELEASE. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0168888A2 true EP0168888A2 (en) | 1986-01-22 |
EP0168888A3 EP0168888A3 (en) | 1987-05-20 |
Family
ID=11198474
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85201125A Withdrawn EP0168888A3 (en) | 1984-07-18 | 1985-07-09 | Ultrarapid-release current-limiter electrical switch |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0168888A3 (en) |
IT (1) | IT8422616V0 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2785085A1 (en) * | 1998-10-22 | 2000-04-28 | Gen Electric | ARTICULATING FOLDING CONTACT ARM DRIVE DEVICE FOR CIRCUIT BREAKER CONTROL MECHANISM, AND CIRCUIT BREAKER COMPRISING SUCH A DEVICE |
EP1261009A2 (en) * | 2001-05-22 | 2002-11-27 | AEG Niederspannungstechnik GmbH & Co. KG | Circuit breaker tripping device and circuit breaker system |
DE19830017B4 (en) * | 1998-06-26 | 2005-10-27 | Siemens Ag | Multipole current-limiting circuit breaker |
EP2824689A1 (en) * | 2013-06-13 | 2015-01-14 | ABB Schweiz AG | Dynamic actuator and electric installation device with a dynamic trigger |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1393064A (en) * | 1963-05-16 | 1965-03-19 | Licentia Gmbh | Circuit breaker where opening the contact system limits the intensity of the current |
DE1238994B (en) * | 1963-06-28 | 1967-04-20 | Licentia Gmbh | Circuit breaker which opens in a current-limiting manner in the event of an overcurrent under the effect of the current flowing through the contact system |
US3505622A (en) * | 1968-11-21 | 1970-04-07 | Ite Imperial Corp | Current limiting circuit breaker with collapsible cradle structure |
FR2305010A1 (en) * | 1975-03-19 | 1976-10-15 | Licentia Gmbh | CURRENT LIMITER CIRCUIT BREAKER |
GB2033159A (en) * | 1978-10-16 | 1980-05-14 | Westinghouse Electric Corp | Current limiting circuit breaker |
US4346358A (en) * | 1981-01-16 | 1982-08-24 | General Electric Company | Contact pop responsive latch release for circuit breakers |
-
1984
- 1984-07-18 IT IT2261684U patent/IT8422616V0/en unknown
-
1985
- 1985-07-09 EP EP85201125A patent/EP0168888A3/en not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1393064A (en) * | 1963-05-16 | 1965-03-19 | Licentia Gmbh | Circuit breaker where opening the contact system limits the intensity of the current |
DE1238994B (en) * | 1963-06-28 | 1967-04-20 | Licentia Gmbh | Circuit breaker which opens in a current-limiting manner in the event of an overcurrent under the effect of the current flowing through the contact system |
US3505622A (en) * | 1968-11-21 | 1970-04-07 | Ite Imperial Corp | Current limiting circuit breaker with collapsible cradle structure |
FR2305010A1 (en) * | 1975-03-19 | 1976-10-15 | Licentia Gmbh | CURRENT LIMITER CIRCUIT BREAKER |
GB2033159A (en) * | 1978-10-16 | 1980-05-14 | Westinghouse Electric Corp | Current limiting circuit breaker |
US4346358A (en) * | 1981-01-16 | 1982-08-24 | General Electric Company | Contact pop responsive latch release for circuit breakers |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19830017B4 (en) * | 1998-06-26 | 2005-10-27 | Siemens Ag | Multipole current-limiting circuit breaker |
FR2785085A1 (en) * | 1998-10-22 | 2000-04-28 | Gen Electric | ARTICULATING FOLDING CONTACT ARM DRIVE DEVICE FOR CIRCUIT BREAKER CONTROL MECHANISM, AND CIRCUIT BREAKER COMPRISING SUCH A DEVICE |
EP1261009A2 (en) * | 2001-05-22 | 2002-11-27 | AEG Niederspannungstechnik GmbH & Co. KG | Circuit breaker tripping device and circuit breaker system |
DE10124985A1 (en) * | 2001-05-22 | 2002-12-12 | Aeg Niederspannungstech Gmbh | Tripping device of a circuit breaker and circuit breaker system |
DE10124985B4 (en) * | 2001-05-22 | 2004-02-05 | Aeg Niederspannungstechnik Gmbh & Co Kg | Tripping device of a circuit breaker and circuit breaker system |
EP1261009A3 (en) * | 2001-05-22 | 2004-10-06 | AEG Niederspannungstechnik GmbH & Co. KG | Circuit breaker tripping device and circuit breaker system |
EP2824689A1 (en) * | 2013-06-13 | 2015-01-14 | ABB Schweiz AG | Dynamic actuator and electric installation device with a dynamic trigger |
Also Published As
Publication number | Publication date |
---|---|
EP0168888A3 (en) | 1987-05-20 |
IT8422616V0 (en) | 1984-07-18 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4259651A (en) | Current limiting circuit interrupter with improved operating mechanism | |
US2581181A (en) | Heavy-duty air circuit breaker | |
US6018284A (en) | Circuit breaker with high electrodynamic strength and breaking capacity | |
GB1214363A (en) | Circuit interrupter | |
ES485005A1 (en) | Current limiting circuit breaker | |
US3599130A (en) | Circuit interrupter | |
CA1231125A (en) | Latch release mechanism for molded case electric circuit breakers | |
US5713459A (en) | Roller latching and release mechanism for electrical switching apparatus | |
US2089716A (en) | Circuit breaker | |
EP0168888A2 (en) | Ultrarapid-release current-limiter electrical switch | |
US4550299A (en) | Electric switch with protective function | |
US4227161A (en) | Current limiting circuit breaker with pivoting contact arm | |
US3786382A (en) | Compact circuit breaker | |
US3475711A (en) | Electric circuit breaker operating mechanism and assembly thereof | |
US3940723A (en) | Instantaneously tripping device for circuit interrupter | |
US2539567A (en) | Electric circuit breaker | |
US4739291A (en) | Magnetic vacuum circuit breaker | |
US3835275A (en) | Electric power circuit breaker equipped with a latching mechanism wherein restoring forces are provided as a function of switching shaft position | |
US3688227A (en) | Impedance protector | |
US3227925A (en) | Control for switch means | |
CA1091733A (en) | Electrical switch assembly including a separate interrupter switch | |
US2315633A (en) | Breaker mechanism | |
US4554524A (en) | Secondary circuit breaker for distribution transformer with indicator light switch mechanism | |
GB1405914A (en) | Electrical circuit breaker | |
US3909764A (en) | Electric circuit breaker |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Designated state(s): BE CH DE FR GB LI NL SE |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): BE CH DE FR GB LI NL SE |
|
17P | Request for examination filed |
Effective date: 19871028 |
|
17Q | First examination report despatched |
Effective date: 19891215 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19900426 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: MOSTOSI, ANGELO |