EP0563775B1 - Disjoncteur de protection commandé par bimétal - Google Patents

Disjoncteur de protection commandé par bimétal Download PDF

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Publication number
EP0563775B1
EP0563775B1 EP93104853A EP93104853A EP0563775B1 EP 0563775 B1 EP0563775 B1 EP 0563775B1 EP 93104853 A EP93104853 A EP 93104853A EP 93104853 A EP93104853 A EP 93104853A EP 0563775 B1 EP0563775 B1 EP 0563775B1
Authority
EP
European Patent Office
Prior art keywords
bimetal
circuit breaker
shunt
rail
contact
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
EP93104853A
Other languages
German (de)
English (en)
Other versions
EP0563775A1 (fr
Inventor
Josef Peter
Peter Meckler
Fritz Krasser
Gerhard Endner
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.)
Ellenberger and Poensgen GmbH
Original Assignee
Ellenberger and Poensgen GmbH
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
Priority claimed from DE9207762U external-priority patent/DE9207762U1/de
Application filed by Ellenberger and Poensgen GmbH filed Critical Ellenberger and Poensgen GmbH
Publication of EP0563775A1 publication Critical patent/EP0563775A1/fr
Application granted granted Critical
Publication of EP0563775B1 publication Critical patent/EP0563775B1/fr
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
    • 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
    • H01H71/46—Automatic release mechanisms with or without manual release having means for operating auxiliary contacts additional to the main contacts
    • 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
    • H01H71/14—Electrothermal mechanisms
    • H01H71/16—Electrothermal mechanisms with bimetal element
    • 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
    • H01H71/43—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
    • H01H71/66—Power reset mechanisms
    • H01H71/68—Power reset mechanisms actuated by electromagnet
    • 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
    • H01H2071/048—Means for indicating condition of the switching device containing non-mechanical switch position sensor, e.g. HALL sensor
    • 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
    • H01H71/14—Electrothermal mechanisms
    • H01H71/16—Electrothermal mechanisms with bimetal element
    • H01H2071/167—Multiple bimetals working in parallel together, e.g. laminated together
    • 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
    • H01H71/46—Automatic release mechanisms with or without manual release having means for operating auxiliary contacts additional to the main contacts
    • H01H2071/467—Automatic release mechanisms with or without manual release having means for operating auxiliary contacts additional to the main contacts with history indication, e.g. of trip and/or kind of trip, number of short circuits etc.
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
    • H01H47/226—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil for bistable relays
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/10—Electromagnetic or electrostatic shielding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H51/00—Electromagnetic relays
    • H01H51/22—Polarised relays
    • H01H51/2209—Polarised relays with rectilinearly movable armature
    • 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

Definitions

  • the invention relates to a circuit breaker with the features of the preamble of claim 1.
  • Such circuit breakers are e.g. known from EP 0 391 086 A1.
  • a U-shaped bimetal with an also U-shaped extension, which acts as a busbar is electrically connected in series.
  • the busbar flanks the bimetal in such a way that the current directions of the sections of busbar and bimetal opposite in the deflection plane of the bimetal are opposite. These opposite current directions strongly repel the bimetal and busbar, especially at high currents.
  • the busbar is fixed in the housing of the circuit breaker, the repulsive forces act as additional electrodynamic forces on the bimetal in order to lay it out in its deflection plane.
  • the relatively slow, thermally induced deflection movement of the bimetal is consequently supported by the electrodynamic force effect. Since this effect occurs particularly at very high currents, a particularly short switch-off time is achieved in the event of a short circuit. With small currents, the electrodynamic force effect is only subordinate or not effective at all.
  • the bimetal In the known bimetallic circuit breaker, the bimetal can be overloaded by excessive currents. It is destroyed or at least its triggering accuracy and sensitivity is impaired. This does not guarantee the safe functioning of the circuit breaker. In order to avoid this danger, known circuit breakers can only be used in a very limited spectrum of different current strengths. Several circuit breakers may have to be used for different currents.
  • the bimetal can e.g. be made more robust by increasing the cross-section.
  • a more robust construction affects its trigger sensitivity and accuracy.
  • the invention has for its object to build a bimetallic circuit breaker such that it is suitable for larger currents.
  • the trigger sensitivity and accuracy of the bimetal should be improved. This object is achieved by the combination of features of claim 1.
  • the circuit breaker Due to the shunt current path electrically connected in parallel to the bimetal, the circuit breaker is suitable for a wide range of different current intensities without having to change the bimetal.
  • the required maximum permissible current strengths are taken into account in a simple manner by a corresponding line resistance of the shunt current path. This is done in a known manner by different lengths or cross-sectional dimensions or also by selecting a different material for the shunt current path.
  • circuit breakers that can be used for different current spectra are technically and structurally identical with the exception of the shunt current path. This lowers the manufacturing and logistics costs of the circuit breakers.
  • the shunt current path connected in parallel also has the effect that the cross section of the bimetal can be reduced without overloading its material by overcurrent.
  • a bimetal with a smaller cross section has improved spring properties for deflecting it.
  • the spring properties of the bimetal are characterized by its moment of resistance, which depends on the width and thickness of the bimetal. The width is linear and the thickness is square in the resistance moment.
  • Such improved spring properties of the bimetal have the effect that the electrodynamic force effect of the busbar on the bimetal is improved.
  • the thermal deflection movement of the bimetal is also facilitated.
  • the trigger sensitivity of the bimetal is increased and shorter trigger times are achieved.
  • the required or desired tripping characteristic can therefore be taken into account in a simple manner by means of bimetals with different cross sections.
  • a shunt current path designed according to the invention as a shunt rail also produces an electrodynamic force between the shunt rail and the bimetal in a corresponding parallel arrangement to the bimetal, the electrodynamic force acting in full on the bimetal through the rigid shunt rail fixed in the housing of the circuit breaker.
  • the tripping sensitivity of the circuit breaker is further increased without additional components.
  • the parallel course of the bimetal, shunt rail and busbar also favors the space-saving construction of the circuit breaker.
  • Claim 2 relates to a preferred embodiment of the arrangement of busbar, bimetal and shunt rail.
  • the shunt rail has a repulsive force between the bimetal and the busbar, for example, so that the bimetal is deflected in the direction of the shunt rail.
  • This deflection movement is supported by an attraction force of the shunt rail on the bimetal.
  • the shunt rail must be designed for a current direction course which causes the attraction.
  • the increased electrodynamic force effect has the advantage that it is effective even with small overcurrents and thereby further increases the sensitivity of the circuit breaker to tripping.
  • the busbar and shunt rail arranged on opposite sides of the bimetal further favor the space-saving construction of the circuit breaker.
  • the force effects of the two rails cannot influence one another. They each act on the bimetal independently with the maximum possible force.
  • Claims 3 and 4 relate to further measures to improve the electrodynamic force effect on the bimetal.
  • the bimetal is U-shaped.
  • the U-plane is arranged at right angles to the deflection plane and the free ends of the U-legs which act as contact ends are fixed in place.
  • the contact ends on the one hand cause the bimetal to be electrically connected in series with the circuit in a simple manner.
  • the one-sided fixation of the bimetal in the area of its contact ends means that a mechanically stable deflection end of the bimetal is created with the connecting yoke connecting the two U-legs.
  • Such a deflection end results in a very effective power transmission of the deflected bimetal to, for example, a switch lock for reliably interrupting the circuit within the circuit breaker.
  • the bimetal, busbar and shunt rail are connected by their contact ends or shunt contacts.
  • the free ends of the U-legs are preferably used as contact ends or shunt contacts. Due to the parallel spacing of bimetal, busbar and shunt rail necessary for the electrodynamic force effects, a structurally simple connection technique of these components in the area of the free ends of the U-legs is possible.
  • connections act on the one hand as electrical contact between the bimetal, busbar and shunt rail and on the other hand as a fixed mechanical fixation of the components to one another. Since the busbar and shunt rail are fixed in the housing, the structural unit made up of bimetal, busbar and shunt rail is adequately fastened in the assembled state of the circuit breaker and is therefore well protected against external forces. As a structural unit, the bimetal, busbar and shunt rail also do not have to be fastened separately within the circuit breaker housing, so that additional fastening means are not required. This saves construction and costs. In addition, the assembly effort is kept low.
  • this compact unit Due to the parallel distance between bimetal, busbar and shunt rail necessary for an effective electrodynamic force effect, this compact unit has a slim design.
  • the circuit breaker housing can thus be made smaller.
  • Claim 7 relates to a preferred embodiment of the connection between bimetal, busbar and shunt rail. This reduces contact resistance between the bimetal, busbar and shunt rail.
  • the welded connection also enables a long service life for the bimetal, busbar and shunt rail as a compact unit.
  • the structural unit is additionally fixed to a support bracket. This promotes the mechanical stability of the assembly in the assembled state. Since the support bracket forms part of the circuit, it is next to the Busbar the second connection contact for the module to connect it electrically in series with the circuit. Mechanically stable and electrically contacting connections between the components are achieved by one and the same measure. This saves on components and costs. The use of only a few components also makes it possible to make the circuit breaker housing smaller.
  • Claim 9 relates to a preferred embodiment of the attachment of the support bracket. This type of attachment makes it possible that the support bracket can be contacted directly with a power line connected to the circuit breaker without the interposition of additional current-conducting components. This in turn saves components, costs and space. Additional contact resistances are also avoided.
  • Claim 10 relates to a particular embodiment of the electrical contact between the carrier console and an external power line or an electrical consumer.
  • the connecting bolt fulfills the double function on the one hand as a mechanical fixing and fastening means and on the other hand as an electrical contacting means for the support bracket.
  • a carrier console designed according to claim 11 enables it to perform several functions. This also supports the space-saving construction of the circuit breaker.
  • the adjustment screw used enables the trigger sensitivity to be changed at any time. This means that one and the same circuit breaker can be triggered at different nominal currents.
  • Bimetal 1 current rail 2 and shunt rail 3 are arranged in mutually parallel planes.
  • the two U-legs 4, 5 of the bimetal 1 are arranged in a longitudinal direction 6.
  • the U-bottom forms the deflecting end 7 of the bimetal 1 and extends in a depth direction 8 running at right angles to the longitudinal direction 6.
  • the deflecting end 7 is bent in the direction away from the metal legs 4, 5 in the direction of the busbar 2 by 45 °.
  • a bimetallic projection 9 adjoins the region of the deflection end 7 which is bent by 45 °.
  • the bimetallic projection 9 has a smaller extent in the depth direction 8 than the deflecting end 7 and is integrally formed at the end of the bent region of the deflecting end 7.
  • the free ends of the bimetal legs 4, 5 are shaped approximately square in the transverse direction 10 and form the bimetal contact ends 11, 12. They are arranged offset in the direction of the busbar 2 relative to the rest of the area of the bimetal legs 4, 5. In the final assembly position, the busbar 2 covers the bimetallic leg 4 as seen in the transverse direction 10.
  • the deflection plane of the bimetal 1 is spanned by the longitudinal direction 6 and the transverse direction 10.
  • a rail extension 13 is integrally formed on the end of the busbar 2 facing the deflection end 7.
  • the rail extension 13 has approximately one seen in the depth direction 8 square cross section.
  • the longitudinal extension of the rail extension 13 corresponds to the depth direction 8.
  • the conductor rail 2 and the rail extension 13 are arranged perpendicular to one another. Together they have an L shape.
  • Busbar 2 and rail extension 13 are made in one piece from a metal strip. However, this metal strip in the depth direction 8 in the region of the busbar 2 is only about half as wide as in the region of the rail extension 13. The outer region of the busbar 2 facing the bimetal leg 4 in the depth direction 8 has a plurality of rectangular bulges or grooves, seen in the transverse direction 10 . The width of the bimetal 1 in the depth direction 8 is somewhat smaller than the corresponding extension of the rail extension 13.
  • the shunt rail 3 like the bimetal 1, is U-shaped. It is arranged in a plane parallel to bimetal 1.
  • the U-bottom of the shunt rail 3 projects beyond the two shunt legs 14, 15 in the depth direction 8. Its extension in this direction is somewhat larger than the corresponding extent of the rail extension 13.
  • the two shunt legs 14, 15 and the adjoining leg ends 16, 17 correspond in outline form and arrangement about the bimetal legs 4.5 and their bimetal contact ends 11, 12.
  • leg ends 16, 17 are extended by fastening ends 18, 19.
  • the leg end 17 is extended approximately in the longitudinal direction 6 by means of the fastening end 19.
  • the fastening end 19 is bent away from the bimetal 1. Seen in the transverse direction 10, the fastening end 19 is approximately square.
  • the leg end 16 has a greater extent in the depth direction 8 compared to the associated shunt leg 14. This is followed by a right-angled bend and directed towards the conductor rail 2, the fastening end 18.
  • the outline shape of the fastening end 18 is essentially rectangular (FIG. 2).
  • the fastening end 18 is pierced in its central region by a rectangular contact opening 20 in the depth direction 8.
  • the surface of the busbar 2 facing the fastening end 18 contains, as already mentioned in FIG. 1, a plurality of grooves and bulges.
  • the contact bulge 22 which extends in the depth direction 8, is formed onto the rail end 21 of the busbar 2 facing away from the rail extension 13. Its outline shape is adapted to the outline shape of the contact opening 20 in such a way that a positive connection between the busbar 2 and the fastening end 18 is produced in the final assembly state.
  • the leg end 16 is pierced in its area facing the leg end 17 by a screw opening 23 in the transverse direction 10. Its outline corresponds approximately to that of a semicircle with its concave side facing the leg end 17.
  • the screw opening 23 enables an adjusting screw 24 (FIG. 3) with its insulating pin 25 to reach through the leg end 16 without contact and act on the bimetal contact end 11 of the bimetal 1 in the final assembly state.
  • the cylindrical insulating pin 25 is integrally formed on the front side of the adjusting screw 24 facing the bimetal 1.
  • the direction of action of the adjusting screw 24 corresponds to the transverse direction 10.
  • the adjusting screw 24 is mounted in a threaded bore 26.
  • the threaded bore 26 breaks through a currentless bearing arm 27 of a support bracket 28 in the transverse direction 10.
  • the bearing arm 27 has the outline shape of a rectangular plate. In the region of its corner edge facing the shunt leg 14 and diagonally opposite corner edge (FIG. 3), the bearing arm 27 is recessed in a rectangular manner.
  • connection arm 29 is integrally formed on the support bracket 28 in addition to the bearing arm 27.
  • the outline shape of the connecting arm 29 is essentially rectangular when viewed in the transverse direction 10. While the currentless bearing arm 27 is arranged parallel to the leg end 16 of the shunt rail 3 in the final assembly position, the connecting arm 29 is bent in the direction of the busbar 2.
  • the connecting arm 29 and the fastening end 19 which is also bent relative to the leg end 17 are arranged in mutually parallel planes.
  • a bimetal contact surface 30 running parallel to the busbar 2 is integrally formed.
  • the bimetal contact surface 30 is square.
  • the plate-like bimetallic contact surface 30 projects beyond the connecting arm 29 in the depth direction 8 on the side facing away from the bearing arm 27.
  • a bottom piece 31 as part of the support bracket 28 is rectangular as seen in the longitudinal direction 6.
  • a connecting bolt 32 (FIG. 4) is electrically contacted in the final assembly position.
  • the base piece 31 is pierced by a cylindrical bolt opening 33 in the longitudinal direction 6.
  • Fig. 3 the bimetallic unit can be seen in its assembled state.
  • the rail end 21 is welded to the bimetal contact end 11 of the bimetal 1.
  • the contact bulge 22 of the busbar 2 is connected by a positive connection to the fastening end 18 of the shunt rail 3 and electrically contacted.
  • the bimetal contact end 12 of the bimetal 1 is welded to the bimetal contact surface 30. The same applies to the fastening end 19 of the shunt rail 3 and the connecting arm 29.
  • the mutually facing end faces of the bimetal contact end 11 and the leg end 16 are separated from one another by an air gap.
  • an insulating plate can be inserted between these two end faces.
  • the bimetal projection 9 passes through a rectangular slide slot 34 of a slide 35.
  • the slide 35 is mounted on the housing and extends in the plane spanned by the depth direction 8 and the transverse direction 10. Seen in the longitudinal direction 6, the slider 35 has a rectangular outline shape.
  • the slide slot 34 is wider in the transverse direction 10 than the bimetal projection 9. Depending on the ambient temperature and the adjustment of the bimetal 1, the bimetal projection 9 lies in a different position within the slide slot 34 along the transverse direction 10.
  • the slide 35 is made of electrically non-conductive material.
  • the rail extension 13 and a contact lever 36 are connected to one another by an electrically conductive strand 52.
  • the contact lever 36 is made of electrically conductive material.
  • the contact lever 36 extends essentially in the transverse direction 10. In its end region facing the bimetal 1, the contact lever 36 contains a bearing opening 37. It breaks through the contact lever 36 in the depth direction 8.
  • the bearing opening 37 is penetrated by an axis, not shown here, which extends in the depth direction 8 and is fixed to the housing.
  • the contact lever 36 is mounted fixed to the housing.
  • a plate-shaped contact piece 38 is attached to the surface of the contact lever 36 facing away from the slide 35 in the longitudinal direction 6.
  • the contact piece 38 is arranged on that end region of the contact lever 36 which faces away from the bearing opening 37 in the transverse direction 10.
  • a pin 39 extending in the longitudinal direction 6 is formed on the surface of the contact lever 36 connected to the contact piece 38. Viewed in the transverse direction 10, the pin 39 is arranged between the bearing opening 37 and the contact piece 38, but at a smaller distance from the bearing opening 37.
  • the pin 39 is positively surrounded by a compression spring 40.
  • the compression spring 40 acts against a surface not shown here and thereby pressurizes the contact lever 36 in the longitudinal direction 6.
  • the compression spring 40 supports the contact lever 36 in a defined switch-on position (FIG. 3) or in a defined switch-off position.
  • the contact piece 38 cooperates with a fixed contact 41 for closing and opening the circuit.
  • the fixed contact 41 is also plate-shaped.
  • the fixed contact 41 is attached to a support base 42.
  • the carrier base 42 is a metal strip bent in a U shape as seen in the depth direction 8.
  • the U-legs extend in the transverse direction 10.
  • the U-base faces the bimetal 1.
  • the fixed contact 41 is arranged in the end region of the U-leg of the support base 42 facing the contact lever 36.
  • the end faces of contact piece 38 and fixed contact 41 facing each other in the longitudinal direction 6 form their contact faces. These contact surfaces extend approximately in the plane spanned by the depth direction 8 and the transverse direction 10. If the mutually facing end faces of the contact piece 38 and the fixed contact 41 lie against one another (FIG. 3), the support base 42 is electrically connected to the rail extension 13.
  • the U-leg of the support base 42 facing away from the contact lever 36 is pierced by a bolt opening 43 in the longitudinal direction 6. It serves the same purpose as the bolt opening 33 in the area of the base piece 31.
  • the bimetal contact end 11 of the bimetal 1 is pressurized by means of the adjusting screw 24.
  • the bimetallic legs 4, 5 can be braced against one another by adjusting the adjusting screw 24.
  • the bimetal 1 is thus adjusted and a different trigger sensitivity can be set.
  • busbar 2 So that only the bimetal 1 is moved when the electrodynamic forces are used, the busbar 2 is fixed in place in the area of its rail extension 13 and the shunt rail 3 in the area of its U-bottom within the circuit breaker housing. This fixation causes the immobility of busbar 2 and shunt rail 3 required with respect to bimetal 1. At the same time, busbar 2 in the region of its rail end 21 and shunt rail 3 in the region of its leg end 16 are still movable in such a way that the pressurization of the bimetal contact end 11 by means of the adjusting screw 24 is not is hindered.
  • the conductor rail 2 is dimensioned weaker in the region of its rail end 21 and its contact bulge 22 due to the shoulder-like arrangement of recesses in the depth direction 8.
  • a current flowing from the support base 42 in the direction of the busbar 2 is divided in the region of the busbar end 21 (FIG. 1).
  • One part flows through the bimetal 1 from the bimetal contact end 11 to the bimetal contact end 12.
  • the other current component flows through the shunt rail 3 from the fastening end 18 to the fastening end 19.
  • the bimetal 1 is designed such that the deflection end 7 is deflected in the direction of a deflection side 44 in the direction of a deflection plane in the event of small overcurrents due to thermal conditions.
  • the side facing away from this is the rear side 45.
  • the bimetal 1 While the thermally induced deflection movement of the bimetal 1 is particularly effective at low overcurrents, the bimetal 1 becomes very large Overflow deflected mainly by the electrodynamic force effect. At high overcurrents, the electrodynamic force supports or replaces the relatively slow, thermally induced deflection movement of the bimetal 1, so that in the event of a short circuit the switch-off time is shortened and the tripping characteristic of the circuit breaker is improved.
  • the busbar 2 and the bimetallic leg 4 act like two parallel conductors through which the current flows in opposite directions. Such conductors repel each other due to the electrodynamic force effect.
  • the shunt leg 14 and the bimetallic leg 4 or the shunt leg 15 and the bimetallic leg 5 act like two parallel conductors through which current flows. Such conductors attract due to the electrodynamic force. Since the busbar 2 and the shunt rail 3 are fixed in place, only the bimetal 1 is moved with its deflecting end 7 in the direction of the deflecting side 44.
  • the switch lock 46 is shown schematically as an approximately square box. It can consist of various electrical and mechanical components, e.g. composed of switches and levers.
  • the arrow directions 47, 48 indicate the interaction of the slide 35 and the contact lever 36 with the switching mechanism 46.
  • the slide 35 acts e.g. on a trigger of the switch lock 46, not shown here.
  • the bimetal projection 9 strikes the slide slot 34.
  • the housing-mounted slide 35 is moved in the direction of the deflection side 44 (FIG. 3).
  • the switch position of the trigger not shown, has the effect that the pressurizing effect of the switch lock 46 on the contact lever 36 in the direction of the fixed contact 41 is ended.
  • the contact lever 36 is rotated counterclockwise about the axis passing through the bearing opening 37.
  • the rotation of the contact lever 36 counterclockwise is supported by the compression spring 40.
  • the contact lever 36 thereby reaches its defined switch-off position.
  • an actuating element can be provided on the switching lock 46 be.
  • the actuating element can be switched by an operator.
  • the switching mechanism 46 produces its pressurizing effect on the contact lever 36.
  • the contact lever 36 is rotated clockwise about the axis passing through the bearing opening 37 in the direction of the fixed contact 41.
  • the mutually facing end faces of the contact piece 38 and the fixed contact 41 rest against one another in the switched-on position of the contact lever 36. This closes the circuit inside the circuit breaker.
  • the effective direction of the contact pressure corresponds to the longitudinal direction 6.
  • the contact pressure is additionally improved by the action of the compression spring 40.
  • the pressurizing effect of the switch lock 46 on the contact lever 36 to remain in its switched-on position can be determined by the operator e.g. be ended via the actuating element, not shown.
  • the switch lock 46 can also be connected to electronics for remote control of the switching position of the contact lever 36.
  • the bimetallic unit shown in FIGS. 1 to 4 is also suitable for currents above 50 A.
  • a current division takes place through the parallel shunt rail 3, which enables the cross-sectional area of the bimetal 1 to be reduced.
  • the reduction in cross section brings about improved spring properties of the bimetal 1, as a result of which the electrodynamic force effect can be better utilized.
  • the bimetal assembly is attached to a housing wall 49 of the circuit breaker.
  • the connecting bolt 32 positively engages through the housing wall 49 and the base piece 31 and in this way establishes a firm mechanical connection between the housing wall 49 and the support bracket 28.
  • the bimetal assembly is a self-supporting, compact and stable unit and, apart from the support bracket 28 and the fixing of the busbar 2 and the shunt rail 3 to the circuit breaker housing, requires no additional fastening means. Because of the necessary insulation, the entire circuit breaker housing exists, ie also the housing wall 49, and a housing wall 50 arranged perpendicularly thereto and made of an insulating material. An external power line or an electrical consumer can be connected to the connecting bolt 32.
  • FIG. 4 it can be seen that the geometric structure of the bimetallic unit is well adapted to the course of the housing walls 49.50.
  • This space-saving structure enables the circuit breaker housing to have small dimensions.
  • a slide housing 51 is integrally formed on the housing wall 50 in the area of the bimetal projection 9.
  • the slide housing 51 extends in the transverse direction 10.
  • the slide 35 is mounted in the slide housing 51.
  • the movements of the slide 30 are performed in the transverse direction 10.
  • the movements of all components are carried out in the deflection plane spanned by the longitudinal direction 6 and transverse direction 10. This also favors the space-saving construction of the circuit breaker housing.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)

Claims (11)

  1. Disjoncteur de protection commandé par bilame comportant, montés en série dans le circuit,
    - le bilame (1) et
    - une barre conductrice (2) rigide par rapport au bilame (1), s'étendant dans le plan de déviation du bilame parallèlement à celui-ci, pour assister la déviation du bilame par effet électrodynamique,
    caractérisé en ce que
    - le bilame (1) est monté en parallèle avec une barre conductrice dérivée (3) rigide par rapport au bilame (1), cette dernière opérant en tant que ligne en dérivation pour former une division du courant et
    - la rigide barre conductrice dérivée (3) s'étend également parallèle au bilame (1) et dans son plan de déviation.
  2. Disjoncteur selon la revendication 1, caractérisé en ce que la barre conductrice dérivée (3) est disposée sur le côté du bilame (1) qui est opposé à la barre conductrice (2).
  3. Disjoncteur selon l'une des revendications 1 ou 2, caractérisé par une forme de profil de la barre conductrice (2) et/ou de la barre conductrice dérivée (3) correspondant approximativement au bilame (1).
  4. Disjoncteur selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que la barre conductrice (2) et/ou la barre conductrice dérivée (3) présentent une longueur effective correspondant à la longueur du bilame (1).
  5. Disjoncteur selon l'une ou plusieurs des revendications précédentes comportant un bilame (1) en forme de U,
    - dont le plan en U est approximativement perpendiculaire au plan de déviation et
    - dont les bras en U (4,5)
    -- sont fixés à demeure avec leurs extrémités de contact de bilame (11,12) et
    -- forment l'extrémité de déviation (7) par l'âme de liaison, caractérisé en ce que la barre conductrice (2) et /ou la barre conductrice dérivée (3) ont également une forme en U, dont les âmes de liaison en U sont disposées respectivement du même côté.
  6. Disjoncteur selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que
    - les extrémités de contact branchées au circuit (11, 12, 17, 21) du bilame (1), de la barre conductrice (2) et de la barre conductrice dérivée (3) et
    - les contacts dérivés (18,22) de la barre conductrice (2) et de la barre conductrice dérivée (3) sont raccordés les uns aux autres.
  7. Disjoncteur selon la revendication 6, caractérisé en ce que le raccord est formé par un soudage.
  8. Disjoncteur selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que l'ensemble constitué par le bilame (1), la barre directrice (2) et la barre directrice dérivée (3) est fixé au contact principal (19) de la barre directrice dérivée (3) et/ou à l'extrémité de contact du bilame (12) en contact avec celui-ci, sur une console support (28) située dans le circuit.
  9. Disjoncteur selon la revendication 8, caractérisé par une fixation de la console support (28) sur une paroi du boîtier (49) du disjoncteur.
  10. Disjoncteur selon la revendication 9, caractérisé en ce que la console support (28) est fixée sur un plot connecteur (32) du disjoncteur servant de raccord à la conduite électrique externe ou à un consommateur électrique.
  11. Disjoncteur selon l'une ou plusieurs des revendications 8-10, caractérisé en ce que la console support (28) présente
    - un bras de raccordement (29) pour les extrémités de contact (12, 17, 19) du bilame (1) et de la barre directrice dérivée (3) ainsi que
    - un bras d'appui (27) sans courant pour loger une vis d'ajustage (24) agissant sur le bilame (1), pour régler la sensibilité de déclenchement du disjoncteur.
EP93104853A 1992-03-31 1993-03-24 Disjoncteur de protection commandé par bimétal Expired - Lifetime EP0563775B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE9204342U 1992-03-31
DE9204342 1992-03-31
DE9207762U 1992-06-09
DE9207762U DE9207762U1 (de) 1992-06-09 1992-06-09 Bimetallgesteuerter Schutzschalter

Publications (2)

Publication Number Publication Date
EP0563775A1 EP0563775A1 (fr) 1993-10-06
EP0563775B1 true EP0563775B1 (fr) 1996-02-07

Family

ID=25959329

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93104853A Expired - Lifetime EP0563775B1 (fr) 1992-03-31 1993-03-24 Disjoncteur de protection commandé par bimétal

Country Status (3)

Country Link
US (1) US5432491A (fr)
EP (1) EP0563775B1 (fr)
DE (1) DE59301570D1 (fr)

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DE102012200728A1 (de) * 2012-01-19 2013-07-25 Siemens Aktiengesellschaft Elektrischer Schalter

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JP3298428B2 (ja) * 1996-05-22 2002-07-02 富士電機株式会社 反転ばね式接点開閉機構および熱動形過負荷継電器
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CZ306743B6 (cs) * 2012-01-19 2017-06-07 Siemens Aktiengesellschaft Elektrický spínač

Also Published As

Publication number Publication date
EP0563775A1 (fr) 1993-10-06
US5432491A (en) 1995-07-11
DE59301570D1 (de) 1996-03-21

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