EP0255483A2 - Mécanisme de commutation d'un interrupteur de protection - Google Patents

Mécanisme de commutation d'un interrupteur de protection Download PDF

Info

Publication number
EP0255483A2
EP0255483A2 EP87810418A EP87810418A EP0255483A2 EP 0255483 A2 EP0255483 A2 EP 0255483A2 EP 87810418 A EP87810418 A EP 87810418A EP 87810418 A EP87810418 A EP 87810418A EP 0255483 A2 EP0255483 A2 EP 0255483A2
Authority
EP
European Patent Office
Prior art keywords
switching mechanism
contact part
movable contact
lever
toggle lever
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.)
Granted
Application number
EP87810418A
Other languages
German (de)
English (en)
Other versions
EP0255483A3 (en
EP0255483B1 (fr
Inventor
Arthur Rusch
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.)
Weber AG
Original Assignee
Weber AG
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 Weber AG filed Critical Weber AG
Publication of EP0255483A2 publication Critical patent/EP0255483A2/fr
Publication of EP0255483A3 publication Critical patent/EP0255483A3/de
Application granted granted Critical
Publication of EP0255483B1 publication Critical patent/EP0255483B1/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
    • H01H71/50—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 switching mechanism of a circuit breaker according to the preamble of claim 1.
  • Such a switching mechanism is e.g. known from DE-A-35l62l7.
  • a circuit breaker is described there (FIG. 1), with a pair of separable contacts 16, 18, at least one of which is movable.
  • the actuating mechanism 34 consists of a locking element 44 and an articulated lever mechanism 58.
  • the locking element 44 is rotatably mounted on the movable contact arm 36.
  • the articulated lever mechanism 58 is connected at one end to an actuating part 32, and at its other end is directly engageable with the movable contact arm 36 and with the locking element 44.
  • the movable contact arm 36 has a locking surface 72, and the locking element 44 has a locking end 82 which, together with the locking surface 72, removably catches the other end of the articulated lever mechanism 58.
  • a stop surface 75 is formed on the movable contact arm 36, which prevents movement of the other end 68 of the articulated lever mechanism 58 beyond a point at which the articulated lever mechanism 58 is partially folded over when the contacts 16, 18 are welded to one another.
  • the switching mechanism described above has the major disadvantage that the locking surface 72 is designed in such a way that the resulting force of the articulated lever mechanism 58 on the movable contact arm 36 is greatest when the contacts 16 and 18 are just touching when switched on. The distance between the piston 30 of the electromagnetic switching device 26 and the movable contact arm 36 is then the smallest. If the circuit breaker is switched on while there is a short circuit on the subsequent electrical lines, a greater force is required to trigger the switch. There is therefore a risk that the switch will not trip. To prevent this, the trigger force should be small with a small trigger stroke and larger with a larger trigger stroke. The trigger stroke is to be understood as the distance between the piston 30 and the movable contact arm 36.
  • the object of the invention is now, in a switching mechanism of the aforementioned type, to improve the interaction of the toggle lever and release lever in such a way that the circuit breaker is triggered with less force when switched on during a short circuit than with a short circuit in the switched on state.
  • This object is achieved in a switching mechanism of the above type by the features of claim 1.
  • the invention is based on the knowledge that only an exact coordination of the forces acting on the switching mechanism ensures an optimal function of the circuit breaker under all conditions.
  • the stroke of the impact anchor - i.e. the total kinetic energy released by the impact anchor can therefore be significantly lower than with conventional circuit breakers.
  • An additional advantage of the invention is the automatic construction of the switching mechanism.
  • the individual parts of the switching mechanism are manufactured in such a way that the circuit breaker can be manufactured in assemblies by production machines. For example, no additional guidance for the toggle lever is required in the switch housing, since it is constantly surrounded by the movable contact part.
  • the guide bracket and the guide in the bottom part of the housing ensure that the switching mechanism does not tilt even during assembly.
  • a part of a circuit breaker is shown, in which the contact parts just touch.
  • the switching mechanism 1 is housed in a housing 2.
  • the contact device of the circuit breaker consists of a movable contact part 3 and a fixed contact part 4.
  • the movable contact part 3 is pressed against the fixed contact part 4 by a contact spring 5.
  • the contact spring 5 is a leg spring with two longer ends. One end lies directly on the narrow side of the housing 2, and the other end is guided into a hole which is located on the top of the movable contact part 3.
  • An actuator 6 - here a rocker arm - is brought into the switched-off state by a helical return spring 7.
  • the actuator 6 is connected to the movable contact part 3 via a toggle lever 8.
  • the toggle lever 8 is a U-shaped bracket, which can be designed as a variant of an almost closed rectangle, and which is guided through a slot 9 in the upper part of the movable contact part 3.
  • a release lever 10 is rotatably connected to the movable contact part 3.
  • a compression spring 11 is provided between the lower end of the release lever 10 and the movable contact part 3.
  • the trigger lever 10 is branched at the top, the right end being provided with a nose which normally holds the toggle lever 8 in the slot 9 at the top.
  • Approximately identical holes are located in the middle of the movable contact part 3 and the release lever 10.
  • One leg of a U-shaped guide bracket l2 forms the axis of rotation and is inserted through the holes.
  • the other leg is from a guide l3 edged in the bottom part of the housing 2 (see also Fig. la).
  • An impact armature l4 which is moved by an electromagnet (not shown here) and a thermal release l5 act on the release lever 10 in the event of a short circuit or overcurrent.
  • a strand l6 connects the movable contact part 3 with the thermal release l5.
  • a stop l7 in the housing at the level of the upper end of the movable contact part 3 limits the opening of the contact.
  • Fig. La is a cross section of the circuit breaker along the line A-A in Fig. L.
  • the same reference numerals have been used for the same elements.
  • the movable contact part 3 consists of two parallel parts which are connected to one another on the rear side.
  • the release lever 10 is arranged in between.
  • FIGS. 2 and 3 The same circuit breaker is shown in FIGS. 2 and 3, in the switched-on and in the switched-off state.
  • Fig. 3 the arrangement of the actuating member 6 and the toggle lever 8 is indicated by a dashed line when released. This is the case when the actuator 6 is blocked in the switched-on state and a short circuit or overcurrent occurs.
  • ⁇ is the angle that exists between the toggle lever 8 and its support surface on the release lever 10 and that determines the resulting force in the direction of the axis of rotation.
  • the trigger stroke of the impact anchor 14 is indicated by B.
  • the angle ⁇ and therefore the contact force on the latch is small when the contact parts 3 and 4 (FIG. 1) are touched.
  • the trigger stroke B of the impact anchor l4 is also small there.
  • the angle ⁇ , the resulting force and the release stroke B are larger.
  • the kinetic energy of the impact anchor l4 which depends on the release stroke B, is low when the force to be overcome is small and larger when this force is greater. This means that the circuit breaker switches off just as well when switched on during a short circuit as when a short circuit is switched on.
  • the above construction of the individual parts of the switching mechanism 1 is particularly advantageous for automatic production of the circuit breaker. Since in particular - apart from the guide l3 - no further guides are required in the housing, the movable contact part 3, the release lever 10, the compression spring 11, the guide bracket 12, the toggle lever 8 and the actuating member 6 can be assembled as the first assembly in production. The switching mechanism 1 constructed in this way can then be pushed into the housing 2 relatively easily. The remaining manipulations can be carried out with the housing open without any aids, since the guide bracket 12 prevents the switching mechanism 1 from being tilted by the contact spring 5.
EP19870810418 1986-07-25 1987-07-27 Mécanisme de commutation d'un interrupteur de protection Expired - Lifetime EP0255483B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH299386A CH670330A5 (fr) 1986-07-25 1986-07-25
CH2993/86 1986-07-25

Publications (3)

Publication Number Publication Date
EP0255483A2 true EP0255483A2 (fr) 1988-02-03
EP0255483A3 EP0255483A3 (en) 1989-12-13
EP0255483B1 EP0255483B1 (fr) 1993-03-10

Family

ID=4246238

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870810418 Expired - Lifetime EP0255483B1 (fr) 1986-07-25 1987-07-27 Mécanisme de commutation d'un interrupteur de protection

Country Status (3)

Country Link
EP (1) EP0255483B1 (fr)
CH (1) CH670330A5 (fr)
DE (1) DE3784582D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1753005A1 (fr) * 2005-08-12 2007-02-14 ABB PATENT GmbH Disjoncteur-protecteur de ligne

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0046841A1 (fr) * 1980-08-21 1982-03-10 Licentia Patent-Verwaltungs-GmbH Mécanisme de commande pour disjoncteur
DE3335887A1 (de) * 1983-10-03 1985-05-02 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Schaltmechanismus fuer leitungsschutzschalter
EP0147629A1 (fr) * 1983-12-17 1985-07-10 Lindner GmbH Fabrik elektrischer Lampen und Apparate Disjoncteur de protection
DE3516217A1 (de) * 1984-05-15 1985-11-21 Mitsubishi Denki K.K., Tokio/Tokyo Schaltungsunterbrecher

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0046841A1 (fr) * 1980-08-21 1982-03-10 Licentia Patent-Verwaltungs-GmbH Mécanisme de commande pour disjoncteur
DE3335887A1 (de) * 1983-10-03 1985-05-02 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Schaltmechanismus fuer leitungsschutzschalter
EP0147629A1 (fr) * 1983-12-17 1985-07-10 Lindner GmbH Fabrik elektrischer Lampen und Apparate Disjoncteur de protection
DE3516217A1 (de) * 1984-05-15 1985-11-21 Mitsubishi Denki K.K., Tokio/Tokyo Schaltungsunterbrecher

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1753005A1 (fr) * 2005-08-12 2007-02-14 ABB PATENT GmbH Disjoncteur-protecteur de ligne
DE102005038149A1 (de) * 2005-08-12 2007-02-22 Abb Patent Gmbh Leitungsschutzschalter
US7495189B2 (en) 2005-08-12 2009-02-24 Abb Patent Gmbh Miniature circuit breaker
CN1913074B (zh) * 2005-08-12 2010-12-22 Abb专利有限公司 线路保护开关

Also Published As

Publication number Publication date
DE3784582D1 (de) 1993-04-15
EP0255483A3 (en) 1989-12-13
CH670330A5 (fr) 1989-05-31
EP0255483B1 (fr) 1993-03-10

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