EP1017079B1 - Hilfseinrichtung für Leistungsschalter - Google Patents

Hilfseinrichtung für Leistungsschalter Download PDF

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Publication number
EP1017079B1
EP1017079B1 EP99204054A EP99204054A EP1017079B1 EP 1017079 B1 EP1017079 B1 EP 1017079B1 EP 99204054 A EP99204054 A EP 99204054A EP 99204054 A EP99204054 A EP 99204054A EP 1017079 B1 EP1017079 B1 EP 1017079B1
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EP
European Patent Office
Prior art keywords
lever
circuit breaker
actuation
auxiliary device
coupling
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
Application number
EP99204054A
Other languages
English (en)
French (fr)
Other versions
EP1017079A3 (de
EP1017079A2 (de
Inventor
Elio Jacovino
Claudio Redaelli
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.)
ABB Service SRL
Original Assignee
ABB Service SRL
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 ABB Service SRL filed Critical ABB Service SRL
Publication of EP1017079A2 publication Critical patent/EP1017079A2/de
Publication of EP1017079A3 publication Critical patent/EP1017079A3/de
Application granted granted Critical
Publication of EP1017079B1 publication Critical patent/EP1017079B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/12—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by voltage falling below a predetermined value, e.g. for no-volt protection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/02—Housings; Casings; Bases; Mountings
    • H01H71/0264—Mountings or coverplates for complete assembled circuit breakers, e.g. snap mounting in panel
    • H01H71/0271—Mounting several complete assembled circuit breakers together
    • H01H2071/0278—Mounting several complete assembled circuit breakers together with at least one of juxtaposed casings dedicated to an auxiliary device, e.g. for undervoltage or shunt trip
    • 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
    • H01H71/04—Means for indicating condition of the switching device
    • 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
    • H01H71/526—Manual reset mechanisms which may be also used for manual release actuated by lever the lever forming a toggle linkage with a second lever, the free end of which is directly and releasably engageable with a contact structure

Definitions

  • the present invention relates to an auxiliary actuation device for opening a circuit breaker associated therewith if the supply voltage drops below a preset threshold. More particularly, the present invention relates to an auxiliary device, known in the art as undervoltage relay, which has improved shape and characteristics.
  • magnetothermal or residual-current circuit breakers for low-voltage electrical applications are generally coupled to suitable auxiliary devices.
  • These devices are conventionally of two kinds, respectively an actuating type and an actuated type, depending on whether they act on the circuit breaker and actuate an action thereof or perform an action as a consequence of an actuation received from said circuit breaker.
  • a typical example of an actuating auxiliary device is constituted by an undervoltage relay, whose main function is to allow to protect loads which are connected to a power supply line, such as for example electric motors, against supply conditions which are not optimum for their operation.
  • the undervoltage relay is in fact supplied by a voltage which is correlated to the voltage of the line to which the load to be protected is connected. If the value of the line supply voltage drops below a threshold, the relay trips, causing the circuit breaker associated therewith to open and therefore interrupting the supply of power to the load. If this did not occur, the load would operate in non-optimum conditions which might cause malfunctions and even damage to said load.
  • the circuit breaker actuates, by means of appropriate lever systems, a kinematic mechanism inside a device for signaling the state of the circuit breaker associated therewith, which accordingly constitutes an actuated device.
  • the actuated device provides operators with a signal which corresponds to the current state of the circuit breaker.
  • one of the solutions generally used entails placing all the auxiliary devices on a same side of the circuit breaker relative to a front view of said circuit breaker.
  • the mechanical connection between the circuit breaker and the auxiliary devices is achieved by using a shaft which is shaped so as to have multiple protrusions and transmits the movements among the various components, according to a solution which is particularly disadvantageous from the point of view of production as well as from the point of view of functionality.
  • the shaft that is used in fact requires accurate machining in order to form the protrusions and the dimensions required to take into account the different stress levels and the considerable clearances involved. This leads to an increase in production costs and possibly to a reduction in the precision and overall reliability of the assembly constituted by the circuit breakers and the auxiliary devices.
  • Another solution that is used for coupling the circuit breaker and the auxiliary devices is to distribute the devices on both sides of the circuit breaker; in particular, relative to a front view of the circuit breaker, the actuating auxiliary devices according to the present invention are always fitted on the same side of the circuit breaker, for example on the left, while the actuated ones are fitted on the other side, on the right.
  • This coupling solution is particularly advantageous with respect to the one described earlier both because it considerably facilitates users in practical applications and because it allows to use a shaft with a smaller number of protrusions, which is accordingly simpler and cheaper to machine; moreover, the mechanical stresses that occur are more balanced and clearance is reduced.
  • magnetothermal and residual-current low-voltage circuit breakers have moving contacts which are mechanically mutually different and can be arranged differently inside the circuit breakers according to specific applications and/or to the applicable national standards.
  • the moving contacts comprise phase contacts and neutral contacts which are mechanically different from each other and can be located either on the right side or on the left side of said circuit breaker relative to a front view thereof.
  • the undervoltage relay is an actuating auxiliary device, it is generally always fitted on the same side of the circuit breaker, for example on the left; in the current state of the art, this leads to the need to produce a plurality of separate series of actuation devices according to the constructive structure of the circuit breaker to which they will be coupled, increasing constructive complexity and production costs.
  • the kinematic mechanisms for opening the contacts of the circuit breaker can be affected negatively by the corresponding kinematic systems of said auxiliary device; in particular, the opening speed of the circuit breaker might be reduced, accordingly leading to malfunctions or even to breakage of said circuit breaker.
  • a further drawback is the fact that if the circuit breaker opens, for example due to a drop in the supply voltage below a threshold, in the current state of the art conventional actuating auxiliary devices are not provided with means for local visual indication means which protrude outside the device and allow easy and immediate identification of the tripped circuit breaker; this furthermore prevents resetting the auxiliary device without directly acting on the open circuit breaker.
  • the aim of the present invention is to provide an auxiliary device for opening a circuit breaker associated therewith if the supply voltage is lower than a threshold in which the coupling to the residual-current or magnetothermal circuit breaker occurs fully independently of the arrangement of the contacts inside it, with a considerable benefit from the point of view of production.
  • an object of the present invention is to provide an auxiliary device for opening a circuit breaker associated therewith if the supply voltage is lower than a threshold in which the coupling with the circuit breaker does not affect the kinematic mechanisms of said circuit breaker, accordingly preserving its design characteristics, particularly in terms of contact opening speed in case of triggering due to a fault.
  • Another object of the present invention is to provide an auxiliary device for opening a circuit breaker associated therewith if the supply voltage is lower than a threshold in which there is a local visual indication of the open state of the circuit breaker caused by a said supply voltage being lower than a threshold.
  • Another object of the present invention is to provide an auxiliary device for opening a circuit breaker associated therewith if the supply voltage is lower than a threshold in which it is possible to reset the auxiliary device without direct intervention on the circuit breaker.
  • Another object of the present invention is to provide an auxiliary device for opening a circuit breaker associated therewith if the supply voltage is lower than a threshold which is highly reliable, relatively easy to provide and at competitive costs.
  • Document DE 87 03 360 U discloses a device according to the preamble of claim 1.
  • the device comprises an insulating enclosure 1 inside which there is an electromagnetic element which comprises a fixed magnet 21 whereon a coil 12 is wound and a moving magnet 22 which is pivoted in a point 100 and with which a return spring 28 is associated.
  • connection terminals 16 In normal operating conditions, i.e., when the associated circuit breaker is closed, the coil 12, whose terminals are connected to connection terminals 16, is supplied with electric power by means of a suitable power supply circuit.
  • the circuit provides a supply voltage which is a function of the voltage of the line in which the device and the circuit breaker associated therewith are inserted.
  • Figures 1 and 2 illustrate a single terminal 16, but the device in actual fact comprises a second connection terminal 16 which is superimposed on the first one.
  • This arrangement generates a magnetic field whose intensity allows to contrast the force applied by the return spring 28 on the moving magnet 22 and to keep the latter coupled electromagnetically to the fixed magnet 21 in the position shown in Figure 1.
  • the return force applied by the spring 28 can be adjusted appropriately by means of an adjustment screw 31 which acts directly on said spring 28. This allows to make the device easily suitable to the applicable standards and/or to specific application requirements.
  • the movement of the moving magnet 22 actuates a suitable kinematic mechanism which opens the circuit breaker in a way described in detail hereinafter.
  • the device according to the invention comprises means for coupling to the circuit breaker which comprise a tripping lever 5, a coupling lever 6 and a transmission lever 10 whose function and connections are described hereinafter.
  • Actuation means actuated by the moving magnet comprise an actuation lever 9.
  • means for the local visual indication of the open state of the circuit breaker due to the supply voltage being lower than a threshold comprise a reset and indication lever 7 and an engagement lever 11.
  • the transmission lever 10 is pivoted in a point 101 of the enclosure 1 with which a return spring 23 is associated; the engagement lever 11 is furthermore arranged on the same pivoting point 101, whereas the reset and indication lever 7 is pivoted in a point 103.
  • the transmission lever 10 is detachably connected, by means of a U-shaped element 32, to a kinematic chain, comprising an actuation lever 4, and to the tripping lever 5, both of which are pivoted to a point 102 of the enclosure 1; an actuation spring 26 whose function will be described in greater detail hereinafter acts on the lever 4.
  • the actuation lever 4 has a pivot 30 which can interact with the surface of a slot 31 of the lever 7 and a groove 33 in which the U-shaped element 32 can slide.
  • the tripping lever 5 comprises a pivot 14 for coupling to the tripping mechanism of the circuit breaker and has the particularity of having a toothed sector 2 whose function will be described hereinafter.
  • the reset and indication lever 7 has, in addition to the slot 31, a first raised portion 34, on which a first end of a spring 24 acts, and a second raised portion 35, which interacts against a shaped wall 36 of the engagement lever 11.
  • Said engagement lever 11, shown in detail in Figure 5, furthermore has a pivot 50 on which the second end of the spring 24 acts.
  • the spring 24 pushes on one side against the raised portion 34, forcing the lever 7 to turn clockwise, and against the pivot 50 at the other side, forcing the lever 11 to turn counterclockwise. Accordingly, the levers 7 and 11 move against each other, facilitating contact between the second raised portion 35 and the shaped wall 36 and remaining engaged in the inactive position shown in Figure 1.
  • the device according to the invention comprises the actuation lever 9 which is operatively actuated by the moving magnet; further, the lever 9 is pivoted to a point 100 of the enclosure 1 and is connected to a return spring 28.
  • the lever 9 is composed of two parts: a first part is shaped so as to form a seat 42 for geometric coupling to the moving magnet 22 and a second part protrudes from the first one, two slots 37 and 38 being formed thereon; in particular, the slot 38 has a substantially straight shaped portion 39 for the purpose described hereinafter.
  • a wing 40 is further provided on the lever 9 and has a protrusion which is substantially perpendicular to the median plane of the lever 9 and is suitable to interact with the pivot 50 of the lever 11 and with the second raised portion 35.
  • the device according to the invention comprises an additional coupling lever 6, pivoted to the point 103, which has a pivot 15 for optional coupling to the kinematic mechanism of the associated circuit breaker, and a toothed sector 3 which is operatively coupled to the toothed sector 2 of the tripping lever 5.
  • the two toothed sectors 2 and 3 mutually mesh, rotating with respect to each other in opposite directions.
  • a further innovative aspect of the actuation device according to the invention is provided by the fact that the lever 7 has a shaped protrusion 60 which, when the circuit breaker opens because the supply voltage is below a preset threshold, protrudes from a corresponding opening 61 formed in the enclosure 1 and therefore allows local visual indication of the tripping of the associated circuit breaker due to the supply voltage being lower than a given threshold. Furthermore, once the protrusion 60 has protruded from the enclosure, it directly provides a button on which an operator can, for any requirement, act directly to reset the auxiliary device without having to act on the associated circuit breaker, which accordingly remains open. The lever 7 therefore simultaneously provides local indication of an open circuit breaker and resetting of said auxiliary device. In further embodiments, not illustrated by figures, said protrusion might be associated with other levers of the kinematic mechanism of the device.
  • the lever 4 under the action of the U-shaped element 32, rotates about its own pivoting axis 102, in the direction indicated by the arrow 106, and reaches the position shown in Figure 2.
  • levers 5 and 6 also rotate in mutually opposite directions, facilitating the meshing of the two toothed sectors 2 and 3.
  • the remaining part of the mechanism is substantially not affected by the movement, since the coil 12 continues to be supplied correctly.
  • the supply voltage of the coil 12 When the mains supply voltage drops below a preset value, the supply voltage of the coil 12 also decreases correspondingly; accordingly, when the supply voltage of the coil 12 drops below a preset threshold value, the return force of the spring 28 is no longer effectively contrasted by the magnetic field generated by the coil 12 and causes the separation of the moving magnet 22 from the fixed magnet 21.
  • the shaped portion 39 of the slot 38 pushes against the pivot 15 of the lever 6, forcing it to rotate in the direction indicated by the arrow 107.
  • the toothed sector 3 meshes with the toothed sector 2 of the lever 5, causing the movement of the pivot 14 in the direction indicated by the arrow 108; in this manner, the circuit breaker receives motion either directly by means of the pivot 15 or indirectly from the lever 5 by means of the pivot 14 and the meshing of the two toothed sectors 2 and 3; furthermore, by virtue of this rotation the tripping lever 5 disengages the U-shaped element 32, which becomes able to slide freely in the groove 33 of the lever 4.
  • the actuation lever 4 no longer locked by the U-shaped element 32, rotates under the action of the thrust of the spring 26 in the direction indicated by the arrow 106 and simultaneously facilitates a faster rotation of the lever 5.
  • This simultaneous rotation is achieved by means of a spring, not shown, which is interposed between the levers 4 and 5 and couples their movement; said spring is conveniently inserted in a seat 80 of the lever 4.
  • the wing 40 of the lever 9 interacts with the pivot 50, pushing it toward the inside of the device and disengaging the shaped wall 36 from the engagement with the second raised portion 35.
  • the lever 7, pushed by the action of the spring 24 on the raised portion 34 rotates about the pivoting axis 103 and the shaped protrusion 60 protrudes from the enclosure 1 through an opening 61, providing a local visual indication that the circuit breaker has tripped because the voltage was lower than the preset threshold.
  • the transmission lever 10 following the movement of the associated circuit breaker, reaches the position shown in Figure 3, in which the U-shaped element 32 re-engages the levers 4 and 5.
  • an operator can therefore reset the auxiliary device simply by acting on the protrusion 60; by pushing the protrusion 60, the second raised portion 35 in fact pushes against the wing 40 of the lever 9 until it reaches a position which is suitable for re-engagement with the shaped wall 36; this re-engagement is facilitated by the thrust applied by the spring 24, which acts on a raised portion 70 of said lever 11.
  • the thrust applied on the wing 40 of the lever 9 furthermore facilitates the movement of the moving magnet 22 toward the fixed one 21 and therefore the reduction of the existing gap. This provides the advantage of being able to optimize the dimensions of the electromagnetic part (moving magnet 22, fixed magnet 21 and coil 12), consequently providing savings in terms of materials, dimensions and costs.
  • the device trips again as described above and prevents the closure of the circuit breaker and the restore of the power supply of the load that it protects.
  • the device can also be reset by acting on the control knob of the circuit breaker.
  • the movement is transmitted from the circuit breaker to the transmission lever 10 which pushes the lever 4 by means of the U-shaped element 32; the pivot 30, during the movement of the lever 4, acts against the surface of the slot 31 of the lever 7 and pulls it downward, causing it to rotate.
  • the second raised portion 35 couples to the shaped wall 36 and pushes downward the protrusion 40, as described earlier.
  • the device causes the circuit breaker to reopen.
  • the auxiliary actuation device according to the invention fully achieves the intended aim, since it allows to provide a coupling with the circuit breaker independently of the mechanical structure of the circuit breaker and of the arrangement of the contacts inside it without affecting its performance in any way; furthermore, by means of the adoption of the particular constructive refinements described above, it is possible to locally and directly identify the opening of the circuit breaker, with consequent reset of said device.

Landscapes

  • Electronic Switches (AREA)
  • Breakers (AREA)
  • Dc-Dc Converters (AREA)
  • Relay Circuits (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Cookers (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)

Claims (10)

  1. Eine Hilfsvorrichtung zur Öffnung eines ihr zugeordneten Leistungsschalters falls die Versorgungsspannung niedriger ist als ein Schwellenwert, aufweisend ein isolierendes Gehäuse, welches einen festen Magneten (21) enthält, auf welchem eine Spule (12) aufgewickelt ist, einen beweglichen Magneten (22) und Verbindungsklemmen, aufweisend:
    - Betätigungsmittel (9), welche betreibbar verbunden sind mit und betätigt werden durch den beweglichen Magneten;
    - eine kinematische Kette, betreibbar verbunden mit den Betätigungsmitteln;
    - Mittel (7, 11) zur Kopplung an den Leistungsschalter, welche betreibbar mit den kinematischen Betätigungsmitteln verbunden sind;
    - Mittel zur lokalen visuellen Anzeige des Offen Zustandes des Leistungsschalters, weil die Versorgungsspannung geringer ist als ein Schwellenwert, dadurch gekennzeichnet, dass
    die Mittel zur Kopplung an den Leistungsschalter zwei Hebel aufweisen, jeweils einen Auslösehebel (5) und einen Kopplungshebel (6), welche betreibbar miteinander verbunden sind, wobei jeder Hebel ein Drehgelenk zur Kopplung mit dem Leistungsschalter aufweist, und dadurch, dass
    die Kopplungs- und Auslösehebel miteinander betreibbar verbunden sind mittels zwei gezahnten Abschnitten, welche den Hebeln zugeordnet sind und sich miteinender verzahnen, wobei sie sich im Bezug aufeinander in zueinander entgegengesetzte Richtungen drehen.
  2. Die Hilfsvorrichtung gemäß Anspruch 1, dadurch gekennzeichnet, dass die Mittel zur Kopplung an den Leistungsschalter einen Übertragungshebel aufweisen, welcher betreibbar mit dem Leistungsschalter verbunden ist und dem eine Rückholfeder zugeordnet ist.
  3. Die Hilfsvorrichtung gemäß Anspruch 1, dadurch gekennzeichnet, dass die Betätigungsmittel, die durch den Magneten betätigt werden, einen Betätigungshebel aufweisen, dem eine Rückholfeder zugeordnet ist, wobei der Betätigungshebel einen Sitz zur geometrischen Koppelung an den beweglichen Magneten hat, und einen Schlitz, der mit einem im Wesentlichen geraden Teil ausgestattet ist, der mit dem Drehgelenk des Kopplungshebels wechselwirken kann.
  4. Die Hilfsvorrichtung gemäß Anspruch 3, dadurch gekennzeichnet, dass sie eine Justageschraube aufweist, welche geeignet ist, die Kraft zu justieren, die durch die Rückholfeder auf den Betätigungshebel ausgeübt wird.
  5. Die Hilfsvorrichtung gemäß Anspruch 1, dadurch gekennzeichnet, dass das kinematische Betätigungsmittel einen Betätigungshebel aufweist, der mit einer Rille ausgestattet ist, in welcher ein U-förmiges Element gleitet, wobei das Element geeignet ist, lösbar den Betätigungshebel und den Auslösehebel mit dem Übertragungshebel zu koppeln.
  6. Die Hilfsvorrichtung gemäß Anspruch 5, dadurch gekennzeichnet, dass eine erste Feder und eine zweite Feder dem Betätigungshebel zugeordnet sind, wobei die erste Feder geeignet ist, eine Menge von Energie bereitzustellen, die benötigt wird, um den Leistungsschalter zu öffnen, wobei die zweite Feder in einen Sitz des Betätigungshebels eingefügt ist und dazu geeignet ist, betreibbar den Auslösehebel mit dem Betätigungshebel zu koppeln.
  7. Die Hilfsvorrichtung gemäß Anspruch 1, dadurch gekennzeichnet, dass die Mittel zur lokalen visuellen Anzeige des Offenzustands des Leistungsschalters, weil die Versorgungsspannung niedriger ist als ein Schwellenwert, einen Rücksetz- und Anzeigehebel und einen Erfassungshebel aufweisen, welche jeweils mit einer Klinke ausgestattet sind und mit einer geformten Wand, welche geometrisch miteinander gekoppelt werden können, wobei die Klinke dazu in der Lage ist, mit einem Flügel wechselzuwirken, der auf der Oberfläche des Betätigungshebels des Betätigungsmittels gebildet wird.
  8. Die Hilfsvorrichtung gemäß Anspruch 7, dadurch gekennzeichnet, dass der Rücksetz-und Anzeigehebel einen Vorsprung hat, welcher aus einer Öffnung des Gehäuses vorspringen kann als Folge der Öffnung des Leistungsschalters, die dadurch bewirkt wird, dass die Versorgungsspannung niedriger ist als ein Schwellenwert.
  9. Die Hilfsvorrichtung gemäß Anspruch 7, dadurch gekennzeichnet, dass der Rücksetz-und Anzeigehebel einen ansteigenden Teil hat, auf welchen ein erstes Ende einer Feder einwirkt, und einen Schlitz, welcher geeignet ist, mit einem Drehgelenk wechselzuwirken, das auf der Oberfläche des Betätigungshebels gebildet wird.
  10. Die Hilfsvorrichtung gemäß Anspruch 9, dadurch gekennzeichnet, dass der Erfassungshebel ein Drehgelenk hat und einen Sitz, welche geeignet sind, mit dem zweiten Ende der Feder zusammenzuwirken, wobei der Flügel ferner auf das Drehgelenk des Erfassungshebels wirkt.
EP99204054A 1998-12-29 1999-12-01 Hilfseinrichtung für Leistungsschalter Expired - Lifetime EP1017079B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI982847 1998-12-29
IT1998MI002847A IT1304061B1 (it) 1998-12-29 1998-12-29 Dispositivo accessorio per interruttori di bassa tensione

Publications (3)

Publication Number Publication Date
EP1017079A2 EP1017079A2 (de) 2000-07-05
EP1017079A3 EP1017079A3 (de) 2001-08-29
EP1017079B1 true EP1017079B1 (de) 2006-02-22

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Application Number Title Priority Date Filing Date
EP99204054A Expired - Lifetime EP1017079B1 (de) 1998-12-29 1999-12-01 Hilfseinrichtung für Leistungsschalter

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EP (1) EP1017079B1 (de)
AT (1) ATE318447T1 (de)
DE (1) DE69929931T2 (de)
IT (1) IT1304061B1 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE60044194D1 (de) * 2000-11-21 2010-05-27 Abb Research Ltd Hilfseinrichtung

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH669067A5 (de) * 1986-04-02 1989-02-15 Sprecher & Schuh Ag Niederspannungs-schutzschalter mit angebautem unterspannungs-ausloeser.

Also Published As

Publication number Publication date
EP1017079A3 (de) 2001-08-29
DE69929931T2 (de) 2006-10-19
ATE318447T1 (de) 2006-03-15
DE69929931D1 (de) 2006-04-27
ITMI982847A1 (it) 2000-06-29
IT1304061B1 (it) 2001-03-07
EP1017079A2 (de) 2000-07-05

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