EP2178101A1 - Niederspannungsschutzschalter - Google Patents

Niederspannungsschutzschalter Download PDF

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Publication number
EP2178101A1
EP2178101A1 EP09171999A EP09171999A EP2178101A1 EP 2178101 A1 EP2178101 A1 EP 2178101A1 EP 09171999 A EP09171999 A EP 09171999A EP 09171999 A EP09171999 A EP 09171999A EP 2178101 A1 EP2178101 A1 EP 2178101A1
Authority
EP
European Patent Office
Prior art keywords
pusher
circuit breaker
bimetal
low voltage
voltage circuit
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
EP09171999A
Other languages
English (en)
French (fr)
Other versions
EP2178101B1 (de
Inventor
Ivan Paleari
Andrea Villani
Matteo Chiaravalli
Marco Tinelli
Tommaso Abbattista
Alberto Antoniazzi
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 SpA
Original Assignee
ABB SpA
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 SpA filed Critical ABB SpA
Publication of EP2178101A1 publication Critical patent/EP2178101A1/de
Application granted granted Critical
Publication of EP2178101B1 publication Critical patent/EP2178101B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H01H71/74—Means for adjusting the conditions under which the device will function to provide protection
    • H01H71/7427—Adjusting only the electrothermal mechanism
    • H01H71/7436—Adjusting the position (or prestrain) of the bimetal

Definitions

  • the present invention relates to a low voltage circuit breaker.
  • circuit breaker in particular for low voltages and for domestic environments for connection between a distribution network upstream and loads downstream.
  • This circuit breaker is positionable between a closed position, in which it creates an electrical and mechanical contact between movable contact elements and fixed contact elements, and an open position, such that electrical and mechanical contact is inhibited.
  • a circuit breaker of this kind comprises safety means capable of detecting potentially hazardous situations and of autonomously opening said circuit breaker.
  • a safety system of this kind uses a bimetal formed by two metal strips, made of different materials, mutually fastened and through which electrical current passes, which flows through the contacts and heats, by Joule effect, the two strips, which tend to expand according to lengths corresponding to the relative coefficients of thermal expansion. This causes bending of the bimetal, which bends until it intercepts a release lever of opening means, which are tripped to take the contacts to an open position.
  • circuit breakers are housed in irreversibly sealed enclosures, and therefore a thermal safety system already housed in a sealed enclosure cannot be re-calibrated.
  • the purpose of the present invention is to simplify mutual positioning operations and to simplify calibration of a thermal safety system.
  • a low voltage circuit breaker for opening and closing electrical contacts provided with a thermal safety system of the bimetal type with:
  • the pusher is supported by a fixed support through a threaded coupling, so as to allow axial movement of the pusher by rotation of said pusher.
  • said peripheral action for movement of the pusher is obtained by means of a toothed wheel emerging peripherally so as to allow a peripheral action of rotation of the pusher.
  • this toothed wheel has a greater radius with respect to the radius of the pusher and is positioned in proximity to the housing of the circuit breaker, in a position that can be reached from the outside through an opening produced in the housing. In this manner, the toothed wheel can also be operated from the outside, once the enclosure has been closed.
  • said axial intrusion is obtained through a screwing means, preferably of the Allen key type, such as an electrical Allen key, which is inserted in an internal axial cavity of the pusher.
  • a screwing means preferably of the Allen key type, such as an electrical Allen key, which is inserted in an internal axial cavity of the pusher.
  • the constrained portion of the bimetal is fastened to a striker support which exerts an elastic reaction force to the thrust of the pusher so as to hold the constrained portion tightly between the pusher and the striker support.
  • the free portion of the bimetal is located at one end of said bimetal facing the insertion lever.
  • the constrained portion of the bimetal is located at the other end of the bimetal.
  • circuit breaker 1 indicates as a whole a low voltage circuit breaker 1, hereinafter also indicated simply as circuit breaker 1.
  • This circuit breaker 1 is capable of opening and closing electrical contacts in a known manner.
  • the circuit breaker 1 also comprises a thermal safety system 3 of the bimetal type.
  • the thermal safety system 3 comprises a bimetal 4 formed by a tongue with double metal strip in two different metals and with different coefficient of thermal expansion.
  • This bimetal 4 is suitable to allow an electrical current to pass through it so that it bends as a result of the heat caused by the electrical current and by the subsequent different expansion between the two strips forming the bimetal.
  • This bimetal 4 (which in the drawings extends vertically) has a free portion 4b, located at one end of the bimetal 4 (in the upper position in the accompanying drawings) and a constrained portion 4a, located on another end of the bimetal 4 (in the lower position in the accompanying drawings).
  • the constrained portion 4a is fastened to a striker support 10, which in the present example is composed of an L-shaped metal support with a fixed arm 10b (positioned horizontally in the drawings) and an elastic arm 10a (positioned vertically in the drawings), and is capable of supporting the bimetal 4.
  • the elastic arm 10a is capable of elastically opposing thrust forces acting on the bimetal 4 (as can be understood from the drawings, when the constrained portion 4a is thrust to the left, an elastic reaction force is exerted to the right).
  • the free portion 4b projects in the opposite direction to the constrained portion (projecting upward in the drawings).
  • the free portion 4b is facing the release lever 5, capable of operating in rotation (counter-clockwise in the accompanying drawings), which operates opening means 2 which force opening of the electrical contacts of the circuit breaker 1.
  • the bimetal 4 is suitable to bend (clockwise in the drawings), and to intercept the release lever 5, so as to force opening of the electrical contacts.
  • Calibration means 6 are provided to calibrate the position of the bimetal 4.
  • These calibration means 6 comprise a pusher 7, in the form of an externally threaded cylinder. Said pusher 7 is supported by an internally threaded fixed support 9: axial movement of the pusher 7 (to the right/left in the drawing), is therefore achieved by axial rotation of the pusher 7.
  • the pusher 7 has a flaring in the forward position, which terminates with a thrust surface 9a suitable to abut against the constrained portion 4a of the bimetal 4.
  • the pusher 7 is axially hollow internally with a cavity capable of receiving an Allen key or other screwing means inserted axially.
  • the pusher 7 comprises a toothed wheel 8 emerging peripherally so as to allow a peripheral action to rotate the pusher 7 also in the absence of the Allen key.
  • This toothed wheel 8 is more radially extended with respect to the pusher 7, and projects from a calibration opening produced on the housing of the circuit breaker: in this manner, the toothed wheel 8 can be reached from the outside through the calibration opening and can be rotated with a toothed wheel tool couplable with the toothed wheel 8.
  • the calibration opening (not visible in the drawings as of obvious structure) allows access only to the toothed wheel 8, so that it is not possible to tamper with other devices of the circuit breaker 1.
  • the calibration operations can therefore be summed up as:
  • the measures described allow pre-calibration both performed with an automatic and rapid Allen key, while fine calibration is performed with the toothed wheel with radial dimensions as large as possible, so as to allow high precision adjustment.

Landscapes

  • Breakers (AREA)
  • Thermally Actuated Switches (AREA)
  • Control Of Eletrric Generators (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Oscillators With Electromechanical Resonators (AREA)
EP20090171999 2008-10-15 2009-10-01 Niederspannungsschutzschalter Active EP2178101B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI20080335 ITMI20080335U1 (it) 2008-10-15 2008-10-15 Interruttore di bassa tensione.

Publications (2)

Publication Number Publication Date
EP2178101A1 true EP2178101A1 (de) 2010-04-21
EP2178101B1 EP2178101B1 (de) 2014-12-10

Family

ID=41478886

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20090171999 Active EP2178101B1 (de) 2008-10-15 2009-10-01 Niederspannungsschutzschalter

Country Status (5)

Country Link
EP (1) EP2178101B1 (de)
CN (1) CN101728128B (de)
AU (1) AU2009222595B2 (de)
IT (1) ITMI20080335U1 (de)
RU (1) RU2524402C2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3126059A1 (fr) * 2021-08-06 2023-02-10 Schneider Electric Industries Sas Dispositif de protection électrique à déclencheur thermique, tableau électrique comprenant un tel dispositif et procédé de réglage d’un tel dispositif

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011078636A1 (de) * 2011-07-05 2013-01-10 Siemens Aktiengesellschaft Überlastauslöser, insbesondere für einen Leistungsschalter
CN205789807U (zh) 2016-06-27 2016-12-07 施耐德电器工业公司 一种热脱扣补偿结构

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0338868A1 (de) * 1988-04-21 1989-10-25 Hager Electro S.A. Modulares elektrisches Schutz- oder Befehlsgerät
EP0710973A1 (de) * 1994-10-18 1996-05-08 Bticino S.P.A. Magnetothermischer Schalter mit thermischem Schutz der mechanisch kalibriert werden kann und ein damit verbundenes Verfahren zur Kalibration
EP1202317A1 (de) * 2000-10-23 2002-05-02 ABL SURSUM BAYERISCHE ELEKTROZUBEHÖR GmbH & Co. KG Schutzschalter mit Bimetall-Eichung

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1756971A1 (ru) * 1990-12-26 1992-08-23 Ульяновский политехнический институт Автоматический выключатель

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0338868A1 (de) * 1988-04-21 1989-10-25 Hager Electro S.A. Modulares elektrisches Schutz- oder Befehlsgerät
EP0710973A1 (de) * 1994-10-18 1996-05-08 Bticino S.P.A. Magnetothermischer Schalter mit thermischem Schutz der mechanisch kalibriert werden kann und ein damit verbundenes Verfahren zur Kalibration
EP1202317A1 (de) * 2000-10-23 2002-05-02 ABL SURSUM BAYERISCHE ELEKTROZUBEHÖR GmbH & Co. KG Schutzschalter mit Bimetall-Eichung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3126059A1 (fr) * 2021-08-06 2023-02-10 Schneider Electric Industries Sas Dispositif de protection électrique à déclencheur thermique, tableau électrique comprenant un tel dispositif et procédé de réglage d’un tel dispositif
EP4138111A1 (de) * 2021-08-06 2023-02-22 Schneider Electric Industries SAS Elektrische schutzvorrichtung mit thermoauslöser, elektrische schalttafel mit einer solchen vorrichtung und verfahren zur regulierung einer solchen vorrichtung

Also Published As

Publication number Publication date
EP2178101B1 (de) 2014-12-10
AU2009222595A1 (en) 2010-04-29
ITMI20080335U1 (it) 2010-04-16
RU2009138070A (ru) 2011-04-20
RU2524402C2 (ru) 2014-07-27
AU2009222595B2 (en) 2015-05-14
CN101728128A (zh) 2010-06-09
CN101728128B (zh) 2014-09-24

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