Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
  • H01H71/10—Operating or release mechanisms
  • H01H71/50—Manual reset mechanisms which may be also used for manual release
  • H01H71/52—Manual reset mechanisms which may be also used for manual release actuated by lever
  • H01H71/526—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 invention relates to a circuit breaker with two-pole interruption to protect lines against fault currents, in particular against thermal overload and short circuit.
• circuit breakers for alternating current have been used that interrupt the circuit with one pole. Since such circuit breakers are usually used in so-called zeroed networks, that is to say in network systems in which the neutral conductor is grounded on the part of the energy supply company, an interruption of the neutral conductor in the house installation is not necessary in the event of a fault.
• a circuit breaker with a single-pole interruption which has a contact device with a fixed contact and a movable contact, which is biased into its closed position by a contact spring.
• a hand switch is provided which is connected via a coupling device to a switching lever which is biased by a switching spring into its position separating the two contacts.
• a pawl which can be pivoted about the same axis as the shift lever, serves to keep the coupling device effectively in engagement with the shift lever, so that the switch can be opened and closed manually.
• An overcurrent release interacts with the pawl in order to actuate the pawl in the event of a fault in such a way that the switching lever is released in order to be pivoted by the switching spring into its position which interrupts the contact.
• the switching lever must move the movable contact against the force of the contact spring into its open position. Should such a circuit breaker be triggered so that it both
• the object of the present invention is to design a circuit breaker with a two-pole interruption in such a way that the triggering forces for two contacts to be interrupted can be applied by a single release, so that all functional elements of the circuit breaker can be accommodated in the overall volume of a conventional single-pole circuit breaker.
• a circuit breaker with a two-pole interruption therefore comprises a first and a second contact device, each of which comprises a fixed contact and a movable contact, the two movable contacts being mounted on a supporting body so as to be pivotable about a common pivot axis and in each case in their closed position by a contact spring are biased, a pivotally mounted switching lever on the supporting body, which is spring-biased by the contact springs of the movable contacts into an interruption position, in which it the movable contact te holds in its off position, a switch actuation element that can be coupled to the shift lever via a coupling device, so that the shift lever can be pivoted from its interrupt position against the force of the contact springs into a release position by means of the switch actuation position and can be held in this position, as long as the switch actuation element with the shift lever is coupled, the coupling device comprising a coupling element which is articulated on the switch actuating element and a pawl which is pivotably mounted on the
• a single spring per contact point is thus simultaneously used as a switching spring in a clever manner, so that the requirements for sufficient contact force, tear-open force and unlatching force are achieved for a two-pole switching device.
• the contact springs are each supported at one end on the movable contact and at the other end on the switching lever.
• the shift lever is designed symmetrically to a plane perpendicular to its pivot axis, and that the movable contacts with respect to this plane are symmetrical to one another in the area of the axial outer surfaces of the Shift lever are arranged, the shift lever in the region of its plane of symmetry has a parallel cut in which the pawl is pivotally mounted.
• a particularly expedient development of the invention is characterized in that the switching lever, which is essentially circular in the form of a section around its pivot bearing, has a recess which extends essentially in an arc shape around its pivot bearing, and in that the pivot axis of the movable contacts is at such a distance from the pivot bearing of the Shift lever is arranged so that it lies within the outer contour of the shift lever in the arcuate recess, wherein in Outer circumferential area of the shift lever for each movable contact
• Driver element is provided to take the movable contacts in their off position in the event of a fault.
• the contact springs are each supported at their one end in the region of the outer circumference of the switching lever and at their other end on the movable contact in such a way that the contact springs with their end regions facing the movable contacts each between one of the driver elements and the Swivel axis of the movable contacts are.
• a driver spring for the switch actuating element is provided on the switching lever in order to bring the switch actuating element into the middle position after a trip in the event of a fault, the driver spring is made in one piece with a contact spring.
• the trigger, the contact devices with assigned extinguishing chambers, and the switching lever with the assigned latch on the common, T-shaped support body are symmetrical are arranged.
• FIG. 1 shows a simplified schematic side view of a circuit breaker according to the invention, a side cover being partially broken away to show the functional elements inside,
• FIG. 2 shows a plan view from below of the circuit breaker according to the invention according to FIG. 1,
• Figures 3a to 3c a side view of the switching and triggering mechanism in various functional positions
• FIGS. 4a to 4c partially sectioned side views, corresponding to Figures 3a to 3c to illustrate the switch function.
• a support body 10 with the functional parts located thereon is closed by a left and right bowl-shaped cover 11, 12.
• the support body 10 and the two covers 11, 12 are connected to each other in a manner not shown by means of molded rivets.
• the circuit breaker according to the invention is equipped with two input-side connection terminals 13 and two output-side connection terminals 14 (only one of which is shown), which can be designed either as screw terminals or as plug-in terminals.
• two input-side connection terminals 13 and two output-side connection terminals 14 (only one of which is shown), which can be designed either as screw terminals or as plug-in terminals.
• plug-in terminals it is advantageous if the connection, as in the case of the connection terminal 14 on the output side shown in FIG. after mounting the circuit breaker on a mounting rail, not shown, in the distribution box or control cabinet.
• these connection terminals 14, which are designed as plug-in terminals are reset so that there is sufficient space for the connection between a cover plate of the distribution box (not shown) and the connection terminal 14.
• a trigger 16 which is preferably designed for thermal and magnetic triggering in the event of a fault, is arranged in a recess 15 of the support body 10 essentially symmetrically to the latter.
• the trigger 16 has a bimetallic disc 17 for thermal triggering and a coil 18 for magnetic triggering.
• a trigger plunger 19 interacts, as can be seen particularly clearly in FIGS. 4a to 4c, with a pawl 20 which is pivotably mounted on a shift lever 21.
• the shift lever 21, which, as can be seen particularly well in FIGS. 3a to 4c, has an outer contour which is substantially in the form of a circular section, is pivotably mounted on a bearing pin 22 provided on the supporting body 10 and is symmetrical in relation to a plane extending perpendicularly to its pivot axis.
• the swivel lever therefore has the same elements on its side shown in FIG. 1 as the back as on its front shown in FIG.
• FIGS. 4a to 4c which show the shift lever 21 in section, that it has an incision lying essentially in the plane of symmetry, in which the pawl 20 is pivotably held, and into which the release key 19 of the Trigger 16 can engage to actuate the pawl 20.
• a movable contact 23 is pivotally mounted on the support body 10 on a pivot pin 24.
• the shift lever 21 has an arcuate recess 21 ', which is arranged such that the pivot pin (s) 24 lie in this recess 21', so that a pivoting movement of the shift lever is not hindered.
• the movable contacts 23 are connected to the respective connection terminal 13 via strands 25. In its closed position, the movable contact 23 bears against a fixed contact 26, one of which is connected to its connecting terminal 14 via the coil 18. The other fixed contact which is arranged on the side of the supporting body 10 which is to be seen as the rear side in FIG. 1, is connected directly to the associated connecting terminal 14.
• Arcing chambers 27 are assigned to the contact devices made of movable contact 23 and fixed contact 26, of which only the one on the left or right side of support body 10 is shown.
• a contact spring 28 which also serves as a tear-open spring, is supported with its one end on a pin 29 provided on the outer circumference of the shift lever 21 and with its other end on the movable contact 23.
• an arcuate stop web 30 is provided as a driving element.
• the driver element can also have any other suitable shape that enables reliable power transmission from the shift lever 21 to the movable contact 23.
• a coupling element 32 is pivotably articulated on the shift handle 31, which is held in coupling engagement with the shift lever 21 by means of the pawl 20.
• the switching handle 31 In order to move the movable contact from the interrupter position shown in FIGS. 3a and 4a to its closed position, the switching handle 31 is moved counterclockwise in FIGS. 3a and 4a, so that it engages via the coupling element 32, that of the pawl 20 in coupling engagement is held with the shift lever 21, the shift lever 21 clockwise moved. Due to the contact spring 28, the movable contact 23 is carried along until it rests on the fixed contact 26. When the switching lever 21 moves further into its locked release position, which is shown in FIGS. 3b and 4b, the stop web 30 is released from the movable contact 23, so that the contact spring 28, which has one end on the movable one
• the current flows from the terminal 13 via the flexible wire 23 to the contact device made of movable contact 23 and fixed contact 26 and further via the coil 18 of the release 16 to the terminal 7.
• the bimetallic disc 18 in the release 16 or the magnet armature respond and move the trigger plunger 19 downwards in FIG. 1 or to the right in FIGS. 3a to 4c.
• the pawl 20 is rotated counterclockwise about its pivot point 20 ', as a result of which the coupling element 32 is released.
• the contact spring 28 now serves as a tear spring, which is supported via the movable contact 23, its bearing pin 24 and the fixed contact 26 on the support body 10, in order to deliver the tear force until the stop bar 30 strikes against the movable contact 23 and tears it off the fixed contact 26.
• the switching lever 21 and thus the movable contact 23 is moved into the position shown in FIGS. 3c and 4c by the contact spring 28, which acts as a tear-off spring, until the switching lever 21 and the pawl 20 on stops 10a and 10b on the support body 10 (in FIGS Figures 3a to 4c not shown) is present.
• a drive spring 33 which is mounted on the pin 29 on the switching lever 21 and cooperates with a projection 34 on the switching handle 31, rotates the switching handle 31 into an intermediate position, by which it is indicated that the circuit breaker has interrupted the lines as a result of a fault.
• the trigger plunger 19 of the trigger 16 is driven so strongly by the magnet armature that not only is the unlatching carried out, as described above, but also via a connecting web 35 against which the pawl 21 is released by the trigger plunger 19 is pressed, the tappet force is transmitted to the shift lever 21 and thus to the movable contact 23.
• the movable contacts 23 are additionally accelerated in the event of a short circuit.
• the switching handle 31 To switch on again, the switching handle 31 must first be turned clockwise in order to pull the coupling element 32 between the pawl 20 and the switching lever 21 until it engages with the pawl 20, as shown in FIGS. 3a and 4a. Then it is switched on again as already explained above.
• the combination of the trigger 16 in connection with the switching lever equipped with a pawl and other functional parts represents a largely tolerance-independent arrangement which does not require any adjustment processes for operation.
• FIGS. 5a, 5b, 6a, 6b and 7a, 7b Components that are identical to those of the first exemplary embodiment are no longer described again.
• Embodiment of the invention to move the movable contacts 23 in their interrupted position (see FIGS. 6b and 7b), instead of or in addition to the stop bar 30, a striking lever 40 is provided which, like FIGS. 5a and 5b, shows two striking bars 42 and two guide cheeks
• the central section 45 of the impact lever 40 carrying the guide cheeks 43 at one end has an extension or nose 46 at its other end, which forms a shoulder or step 47 with the central section 46.
• the nose 46 of the impact lever 40 is guided like the pawl 20 in the incision in the shift lever 21.
• the striking lever 40 is mounted between the shift lever 21, support body 10 and movable contacts 23 in such a way that its central portion 45 and the elongated nose 46 partially surround the bearing pin 24 of the movable contacts 23 extends around, while the striking webs 42 abut against a projection 23 'of the movable contacts 23.
• the pawl 20 is first pivoted, as described in connection with the first exemplary embodiment, so that the coupling element 32 is released. At the same time, the pawl 20 strikes the striking lever 40 and moves it in such a way that the movement of the striking lever 40, which is transmitted to the moving contacts 23 by means of the striking webs 42, moves them into their interrupted position, as can be seen particularly well in FIG. 7b.
• a guide wall accommodated between the guide cheeks 43 of the striking lever 40 can have a corresponding guide or cam surface.
• Impact lever 40 strikes the side of the pawl 20 and after completion tion of the tearing movement secures the movable contacts 23 via the striking lever in its interrupted position.
• an impact lever 40 is provided as an additional special element of the switching mechanism, via which the trigger plunger 19 of the trigger 16 acts on the movable contacts 23.
• the movable contacts can be opened more quickly, so that a timely and reliable opening of the circuit breaker is ensured in the event of a short circuit or the like.
• the striking lever 40 is formed symmetrically to the center plane of the circuit breaker.

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• Breakers (AREA)
• Mechanisms For Operating Contacts (AREA)
• Emergency Protection Circuit Devices (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=27815731

Family Applications (1)

Country Status (7)

Families Citing this family (2)

Citations (4)

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• 2002
  • 2002-03-18 DE DE10211905A patent/DE10211905A1/de not_active Withdrawn
• 2003
  • 2003-03-18 DE DE50306378T patent/DE50306378D1/de not_active Expired - Lifetime
  • 2003-03-18 AU AU2003214137A patent/AU2003214137B9/en not_active Ceased
  • 2003-03-18 ES ES03709797T patent/ES2279099T3/es not_active Expired - Lifetime
  • 2003-03-18 AT AT03709797T patent/ATE352857T1/de not_active IP Right Cessation
  • 2003-03-18 CN CNB038113619A patent/CN100356494C/zh not_active Expired - Fee Related
  • 2003-03-18 EP EP03709797A patent/EP1488438B1/de not_active Expired - Lifetime
  • 2003-03-18 WO PCT/EP2003/002817 patent/WO2003079389A1/de active IP Right Grant

Patent Citations (4)

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