US3914720A - Automatic protective circuit breaker - Google Patents

Automatic protective circuit breaker Download PDF

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Publication number
US3914720A
US3914720A US507572A US50757274A US3914720A US 3914720 A US3914720 A US 3914720A US 507572 A US507572 A US 507572A US 50757274 A US50757274 A US 50757274A US 3914720 A US3914720 A US 3914720A
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Prior art keywords
armature
magnetic
air gap
automatic switch
magnetic core
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Expired - Lifetime
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US507572A
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English (en)
Inventor
Horst Drubig
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Siemens AG
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Siemens AG
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    • 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
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/34—Electromagnetic mechanisms having two or more armatures controlled by a common winding
    • 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
    • H01H71/1081—Modifications for selective or back-up protection; Correlation between feeder and branch circuit breaker
    • 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
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2409—Electromagnetic mechanisms combined with an electromagnetic current limiting mechanism
    • 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
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2454—Electromagnetic mechanisms characterised by the magnetic circuit or active magnetic elements
    • 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
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2463—Electromagnetic mechanisms with plunger type armatures

Definitions

  • H01H 75/10; HOlH 77/06 armature which acts on a movable Contact member 53 Field f Search 335 14 1 23 2 5 174 and is arranged in a magnetic circuit which is in com- 335/175 6, 1 76 mon with the first armature.
  • the tripping device contains a magnetic core, an exciter coil and a magnetic 5 References Cited shunt across the air gap of the additional armature.
  • the invention concerns an automatic switch, particularly a protective circuit breaker, with a latching mechanism and a magnetic tripping device which comprises two armatures which are placed, together with their operating air gaps, in a common magnetic circuit of said magnetic tripping device, containing a magnetic core with an exciter coil and, as the case may be, a magnetic yoke, the first of which armatures acts on an unlatching lever of the latching mechanism and the second on a movable contact member, particularly on a movable contact member that can be actuated by the latching mechanism.
  • the number of ampere turns of the exciter coil of the magnetic tripping device required for releasing the latching mechanism is given by that number of ampere turns which, overcoming the air gap of the plunger-type armature, saturates the shunt body, plus the number of ampere turns which, overcoming the air gap of the plunger-type armature and the air gap of the hinged armature, imparts to the hinged armature the force required for releasing the latching mechanism. Additional ampere turns are required to overcome the strong restraining force at the plunger-type armature and to achieve a sufficiently high opening velocity and opening force of the plunger-type armature.
  • the magnetic force acting on the hinged armature furthermore continues to rise quadratically in the prior art automatic switch for currents that are larger than the response current of this hinged armature.
  • this automatic switch is particularly sensitive to short current pulses, e.g., switching pulses of incandescent lamp or fluorescent lamp groups with capacitive compensation, which cause the automatic switch to trip in an undesired manner, if these current pulses exceed even slightly the response current of the hinged armature. Because of this high pulse sensitivity, the prior art automatic switch has only very little or practically no selectivity with respect to a following, current-limiting automatic switch.
  • a magnetic material goes into magnetic saturation if its permeability p. p #0 (u, relative permeability, y. magnetic field constant or induction constant), starting from a maximum value, no longer increases, but decreases with increasing magnetic excitation or magnetic field strength.
  • the magnetic material is magnetically saturated if the relative permeability n, has finally fallen to the constant value 1 with increasing magnetic excitation or field strength.
  • an automatic switch of the kind mentioned at the outset is characterized, according to the invention, by the feature that parallel to the operating air gap of the second armature, which acts on the movable contact member, a magnetic shunt is disposed which magnetically bridges this operating air gap at least partly.
  • the magnetic flux permeates first the magnetic shunt which is disposed parallel to the operating air gap of the armature acting on the movable contact member, and at the same time the operating air gap, disposed in series with this shunt, of the first armature, which acts on the unlatching lever of the latching mechanism.
  • the number of ampere turns required to make the armature acting on the latching mechanism respond is therefore given, up to the point of magnetic saturation of the shunt, only by the operating air gap of the first armature, which acts on the unlatching lever of the latching mechanism.
  • the automatic switch according to the invention is a fast-action switch, which can be designed as a current-limiting switch without difficulty.
  • the shunt which is parallel to the operating air gap of the second armature, which acts on the movable contact member, is advantageously designed so that it goes into magnetic saturation, or is just magnetically saturated, at the peak value of a current which flows through the exciter coil of the magnetic tripping device and is within the tolerance of the response current of the first armature, which acts on the unlatching lever of the magnetic tripping device.
  • practically no restraint, or perhaps only a weak fixation, for instance, through a weak and soft spring is necessary for the armature acting on the movable contact member. It is furthermore achieved thereby that the force of the armature acting on the latching mechanism no longer continues to increase quadratically above its response value.
  • the armature acting on the unlatching lever of the latching mechanism is particularly insensitive to energization of the exciter coil of the magnetic tripping device by pulse-like currents (selectivity).
  • the tolerance range of the response current is given by the different possible phase positions of the current waves, by the waveform of these current waves, and by the mechanical properties of the automatic switch, among others.
  • FIGS. 1 and 2 show embodiments of magnetic tripping devices of an automatic switch according to the invention.
  • FIGS. 3 and 4 show equivalent magnetic circuit,diagrams for the magnetic tripping devices according to FIGS. 1 and 2.
  • FIG. 5 shows the curve of the magnetic induction in the air gaps of the armatures of the magnetic tripping devices according to FIGS. 1 and 2.
  • FIG. 6 shows the curve of the force at the armatures of the magnetic tripping device according to FIGS. 1 and 2.
  • FIGS. 7 and 8 show a different embodiment of magnetic tripping devices of an automatic switch according to the invention.
  • FIGS. 9 and 10 show equivalent magnetic circuit diagrams for the magnetic tripping devices according to FIGS. 7 and 8.
  • FIG. 11 shows the curve of the magnetic inductions in the air gaps of the armatures of the magnetic tripping devices according to FIGS. 7 and 8.
  • FIG. 12 shows the curve of the forces on the armature of the magnetic tripping devices according to FIGS. 7 and 8.
  • FIG. 13 shows a multi-pole automatic switch connected from single-pole automatic switches in accordance with the invention.
  • FIGS. 1 and 2 magnetic tripping devices with a magnetic core 1 consisting of iron are shown. These magnetic tripping devices further comprise U-shaped magnetic yokes 2 of magnetic material, e.g., iron, which establish a magnetic connection between the magnetic core 1 and the two plunger-type armatures 3 and 4. These plunger-type armatures 3 and 4 are nested coaxially inside each other. They are both arranged coaxially in a guide tube 6 of nonmagnetic material, for example, of brass. The magnetic core 1 is also placed within this guide tube. An exciter coil 5 is mounted on the outer cylinder surface of the guide tube 6.
  • U-shaped magnetic yokes 2 of magnetic material e.g., iron
  • the plunger-type armature 3 acting on the unlatching lever 7 of the latching mechanism 8 is arranged inside the striking armature, which is designed as a cylindrical plunger armature 4.
  • This armature 4 acts by means of mechanical linkage on the movable contact member 9.
  • the striking armature which acts directly on the movable contact member 9 and is designed as a plungertype armature, is placed inside of the plunger-type armature 3, which is designed as a hollow cylinder and acts on the unlatching lever 7 of the latching mechanism 8.
  • the plunger-type armature 4 of the magnetic tripping device according to FIG. 2 is provided with a push rod 4a of nonmagnetic material, which is coaxial to the guide tube 6 and is free to move within the magnet core 1 which is designed in the shape of a hollow cylinder.
  • Push rod 4a strikes movable contact member 9 of the protective circuit breaker when the plunger armature 4 responds.
  • the air gap (operating air gap) between the magnetic core 1 and the plunger armature 4, which acts directly on the movable contact member 9, has a greater length 6 than the length 8 of the air gap (operating air gap) between the magnetic core 1 and the plunger-type armature 3 acting on the unlatching 7.
  • the plunger-type armature 3 which acts on the unlatching lever 7 of the latching mechanism 8, acts as a magnetic shunt body which is parallel to the operating air gap between the magnetic core 1 and the plunger armature 3.
  • This magnetic shunt body bridges the operating air gap between the magnetic core I and the plunger armature '4 and goes into magnetic saturation in the case of overcurrents or short-circuit currents which flow through the exciter coil and lie within the tolerance range of the response current of the armature 3.
  • the equivalent magnetic circuit diagram according to FIG. 3 applies to the magnetic tripping devices according to FIGS. 1 and 2.
  • the magnetic reluctance R 5 and R 5 of the initial air gaps (operating air gaps) between the magnetic core 1 on the one hand and the armature 3 and the armature 4, respectively, are connected in parallel by means of symbolic switches S1 and S2.
  • the symbolic switch S1 which lies in the branch of the magnetic reluctance R 5 of the operating air gap between the magnetic core land the armature 3, bridges a magnetic reluctance R 5 2 5 by which the magnetic reluctance R 5 D of the operating air gap 61 between-the magnetic core I and the armature 3 increases if the armature 3 is magnetically saturated.
  • B is the magnetic flux generated by the exciter coil 5.
  • the symbolic switch S1 is closed if the magnetic shunt to the operating air gap between the magnetic core and the armature 4 with the initial length 0 which is formed by the armature 3, is unsaturated, and the symbolic switch S2 is open.
  • the magnetic flux caused by the magnetic flux of the exciter coil 5 travels almost exclusively by means of the operating air gap between the magnetic core 1 and the armature 3, which has the initial length 6
  • the iron of the armature 3 and therefore, the magnetic shunt to the operating air gap between the magnetic core 1 and the armature 4 is magnetically saturated, the equivalent magnetic circuit diagram according to FIG.
  • H w peak value of the current.
  • the magnetic excitation required for saturating the iron of the arrnatures 3 and 4 is assumed as zero.
  • the induction B in the operating air gap between the magnetic core 1 and the armature 4 is zero as long as the iron of the armature 3 is unsaturated. Only when the iron of the armature 3 is magnetically saturated does the magnetic induction B in the operating air gap between the magnetic core 1 and the armature 4 increase.
  • the magnetic force F acting on the armature increases quadratically very quickly up to the saturation of the iron of the armature 3 and subsequently rises linearly with only a slight slope as the magnetic excitation increases. Only after the iron of the armature 3 is saturated does a magnetic force F occur at the armature 4.
  • the armature 3 is advantageously designed so that it goes into magnetic saturation or is just magnetically saturated at the peak value of a current which flows through the exciter coil 5 of the magnetic tripping device and lies within the tolerance range N/ 2 w of the response current of this armature 3.
  • the restoring force of the relatively weak fixation spring 13 of the armature 4 is quickly overcome, and the armature 4 is accelerated more and more as the length of the air gap between it and the gap between it and the magnetic core 1 decreases. Particularly with these large short-circuit currents, the motion of the armature 4 can proceed entirely independently of the motion of the armature 3.
  • An automatic switch in accordance with the invention with a magnetic tripping device according to FIGS. 1 and 2 has, in particular, the advantage that for the at: mature 3, which acts on the unlatching lever 7, only an air gap to the magnetic core 1- is necessary, which has a relatively short length.
  • This air gap length is determined only by the geometric design of the latching mechanism 8, i.e., by the release travel of the latch lever 7.
  • the nominal response current for the automaticswitch therefore needs to supply only a magnetic excitation, which is determined by the required, relatively small air gap between the magnetic core 1 and the armature 3 associated with the unlatching lever 7 and perhaps further by the unlatching force of the latching mechanism 8.
  • the air gap is determined by the required, relatively small air gap between the magnetic core 1 and the armature 3 associated with the unlatching lever 7 and perhaps further by the unlatching force of the latching mechanism 8.
  • an automatic switch according to the invention is very insensitiveto short current pulse, e.g., switching pulses, and is therefore particularly well suited, without reduction of the.
  • this preceding power circuit breaker is an automatic switch according to the invention, it is considerably less sensitive to this single current pulse than prior art automaticswitches and therefore trips only at considerably larger uninfluenced short-circuit currents than prior automatic switches, so that thus a considerable increase of the selectivity is achieved.
  • the switch according to FIG. 7 is formed by an immovable body of-magnetic material 1 which is placed in the magnetic circuit of the magnetic tripping device.
  • This body of magnetic material consists of a hollow cylinder 15, which at one endface joins'the magnetic core 1 of the magnetic tripping device.
  • a likewise cylindrical plunger-type armature 4 of magnetic material is arranged, which acts directly on the movable contact member 9 by means of a nonmagnetic push-rod 4a.
  • the hollow cylinder completely bridges, as a magnetic shunt, the operating air gap between the plungenarmature 4 and the magnetic core 1.
  • the exciter coil5 is mounted on the magnetic core and the hollow cylinder 15.
  • a hingedarmature 3 which acts on the unlatching lever 7 of the latching mechanism ,8 and which is arranged opposite the pole surface la of themagnetic .core.
  • the push rod 4a is brought concentrically through the magnetic core 1.
  • a restoring spring 14 is associated with .the
  • the Y armature 3 acting on the unlatching, lever 7v of the latching mechanism 8 consists of a plate of magnetic material which is guided in a guide 16 and is provided with a restoring spring 14.
  • the exciter coil 5 is mounted on a cylinder of non-magnetic material 6, in which the magnetic core 1 and the post lb are arranged coaxially.
  • the exciter coil 5 is secured in a magnetic yoke 2 con-.
  • the armature which acts directly onithe movable contact member 9 is designed as a plunger armature 4, which is arranged coaxially in the insulating material sleeve 6 and has a central coaxial hole 4a to receive the post lb.
  • This immovable post 1b forms amagn'etic shunt to the air gap between the mag- -rent of the hinged armature 3.
  • R represents the magnetic reluctance of the air gap between the magnetic core 1 and the armature 4
  • R 5 represents the magnetic reluctance of the air gap between the hinged armature 3 and the magnetic core 1.
  • S1 a symbolic switch which is closed if the hollow cylinder or the post 1b, respectively, is magnetically unsaturated, is open if the hollow cylinder 15 or the post lb is magnetically saturated.
  • the air gap between the magnetic core 1 and the plunger armature 4 is at first not effective when the cylinder 15 or the post lb is magnetically unsaturated, i.e., if the symbolic switch S1 is closed.
  • the symbolic switch S1 is open if the hollow cylinder 15 or the post lb is magnetically saturated, and the magnetic reluctance of the air gap with the initial length 8 between the magnetic core 1 and the plunger armature 4 is connected in series with'the magnetic reluctance of the air gap with the initial length 6 between the hinged armature 3 and the magnetic core 1.
  • the curve of the induction in the air gap between through the exciter coil 5 a magnetic flux which is about 50 percent of the saturation induction. Only from this current on, an increase in the induction occurs for the flux B in the air gap with the initial length 6, between the magnetic core 1 and the armature 4.
  • FIG. 12 shows, plot ed versus the peak value of the magnetic excitation w I (ampere turns), the curves of the magnetic forces F and F exerted on the armatures 3 and 4,-resulting therefrom.
  • the tolerance range N/ T. w for the response current of the armature 3 flowing through the exciter coil 5 occurs about in the region of the discontinuity of the force curve F for the armature 3 acting on the unlatching lever 7 of the latching mechanism 8. This insures that a magnetic force is exerted on the armature 4, which acts directly on the movable contact member, only if the tolerance range of the response current of the armature 3 is exceeded in the case of small overload or short-circuit currents.
  • the length of the air gap between the armature acting on the unlatching lever and the magnetic core can be increased for part of this end face and the induction curve and the magnetic force, which is exerted on the armature associated with the unlatching lever can thereby be varied.
  • An automatic switch according to the invention has, in particular, the advantage that the air gap of the striking armature acting directly on the movable contact member and therefore, also the contact burn-off, for instance, and the manufacturing tolerances have no effect of any kind on the number of ampere turns, required for the function of the armature acting on the unlatching leverof the latching mechanism, of the exciter coil'of the magnetic tripping'device for unlatching the latching mechanism.
  • the invention concerns not only single-pole automatic switches with a single latching mechanism and a single magnetic tripping device, but also multi-pole automatic switches with at least one movable contact member per pole.
  • a single latching mechanism or one latching mechanism per pole and one magnetic tripping device per pole can be designed in accordance with the invention. This can involve line protection switches, power circuit breakers and motor protection switches. It is particularly advantageous to design a three-phase power circuit breaker in accordance with the invention and to associate with each of the three phases a movable contact member 39 and a magnetic tripping device.
  • Each of the three magnetic tripping devices has a release armature 33, which serves for releasing the single latching mechanisms 38 of the three-phase power circuit and acts on the unlatching lever 37 of this latching mechanism 38.
  • the three release armatures 33 are restrained by a common spring 44, so that the sum of the forces of the three release armatures 33 acts on this spring 44.
  • Each of the three magnetic tripping devices has furthermore a second striking armature 34 acting on the movable contact member 39 associated with it, with a magnetic shunt 45 to the air gap, designed in accordance with the invention.
  • This three-phase power circuit breaker has further improved selectivity properties over a current-limiting power circuit breaker in accordance with the German Pat. No. 1,588,109.
  • the striking armatures 34 acting on the movable contact members 39 are in no way influenced by the coupling of the three release armatures 33 acting on the unlatching lever 37 of the latching mechanism 38, so that a three-phase power circuit breaker designed in accordance with the invention has a high switching capacity and is currentlimiting.
  • the three release armatures 33 can advantageously be rigidly coupled with each other by means of connecting members, or also rest against the unlatching lever 37 of the latching mechanism 38 independently of each other.
  • the three striking armatures 34 can also be coupled with each other rigidly by connecting members in an advantageous manner and serve for simultaneously striking the three movable contact members 39. However, they may also be not coupled and act independently of each other on the respective movable contact member 39 associated with them.
  • An automatic switch comprising the combination of a latching mechanism having an unlatching lever and a movable contact member which can be actuated by the latching mechanismand a magnetic tripping device comprising, l
  • magnetic shunt means for magnetically bridging said second air gapat least in part with said magnetic core.
  • a three-phase automatic switch comprising the combination of a single latching mechanism having three separate unlatching levers all coupled with each other at 'a common restraining device, and three corresponding separate movable contact members which can be actuated by the latching mechanism, and three separate magnetic tripping devices comprising,
  • first armature for each separate tripping device each mechanically linked to a separate unlatching lever
  • second armature for each separate tripping device each mechanically linked to said corresponding movable contact members
  • an exciter coil for each triggering device for causing magnetic .flux to flow betweensaid magnetic core and said first armature across a first air gap and causing magnetic flux'to flowfbetween said magnetic core and said second armature across a second air gap, wherein said first armature is placed at least in part in the same magnetic flux path as is said second armature, and s V I magnetic shunt means for magnetically bridging each said second air gap at least in part with each said magnetic core.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Electromagnets (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Keying Circuit Devices (AREA)
US507572A 1973-09-27 1974-09-19 Automatic protective circuit breaker Expired - Lifetime US3914720A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2348613A DE2348613C2 (de) 1973-09-27 1973-09-27 Selbstschalter, insbesondere Schutzschalter

Publications (1)

Publication Number Publication Date
US3914720A true US3914720A (en) 1975-10-21

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US507572A Expired - Lifetime US3914720A (en) 1973-09-27 1974-09-19 Automatic protective circuit breaker

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US (1) US3914720A (es)
JP (1) JPS5639013B2 (es)
AT (1) AT331338B (es)
BE (1) BE820214A (es)
CH (1) CH576188A5 (es)
CS (1) CS200174B2 (es)
DD (1) DD114169A5 (es)
DE (1) DE2348613C2 (es)
DK (1) DK140817B (es)
ES (1) ES430451A1 (es)
FI (1) FI58844C (es)
FR (1) FR2246052B1 (es)
GB (1) GB1486261A (es)
IT (1) IT1022195B (es)
NO (1) NO137029C (es)
SE (1) SE396844B (es)
ZA (1) ZA746037B (es)

Cited By (15)

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US4307358A (en) * 1977-11-08 1981-12-22 La Telemecanique Electrique Electromagnetic contactor is fitted with an electromagnet sensitive to over-currents, to cause the limitation and cut-off of excess currents
US4864262A (en) * 1988-08-12 1989-09-05 Westinghouse Electric Corp. Undervoltage trip device
CN1041971C (zh) * 1994-02-28 1999-02-03 断路器工业有限公司 一种用于断路器的电磁操纵装置
US5933063A (en) * 1997-07-21 1999-08-03 Rototech Electrical Components, Inc. Ground fault circuit interrupter
US20030107016A1 (en) * 2001-12-07 2003-06-12 Santos Burrola Electromagnetically energized actuator
US6768626B1 (en) * 1999-01-06 2004-07-27 Holec Holland N.V. Trip system for an electrical switch having a favorable force-path-characteristic
US20040155215A1 (en) * 2003-02-08 2004-08-12 Walter Kill Electromagnetic double switching valve
EP1473753A1 (de) * 2003-04-30 2004-11-03 Siemens Aktiengesellschaft elektromagnetisches Schaltgerät
US20100026426A1 (en) * 2008-07-31 2010-02-04 Hubbell Incorporated Impact Solenoid Assembly For An Electrical Receptacle
US20110043307A1 (en) * 2009-08-24 2011-02-24 Ford Global Technologies, Llc Vehicle Power System And Electrical Contactor For Use With Same
CN102254718A (zh) * 2011-06-30 2011-11-23 无锡市凯旋电机有限公司 电动或自动离合的电动操作机构
EP2525382A1 (en) * 2011-05-16 2012-11-21 C&S Technology Ltd. Combined function circuit protection and control device actuator
US20130088312A1 (en) * 2010-06-21 2013-04-11 Nissan Motor Co., Ltd. Electromagnetic relay
WO2015091868A1 (de) * 2013-12-20 2015-06-25 Eaton Industries (Austria) Gmbh Schaltgerät
US20170133184A1 (en) * 2015-11-10 2017-05-11 Lisa Dräexlmaier GmbH Electromechanical circuit breaker

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JPS52168256U (es) * 1976-06-15 1977-12-20
FR2421458A1 (fr) * 1978-03-31 1979-10-26 Merlin Gerin Disjoncteur multipolaire a dispositif electromagnetique d'ouverture rapide du contact mobile
DE3016467A1 (de) * 1980-04-29 1981-11-05 Christian Geyer GmbH & Co, 8500 Nürnberg Elektromagnet fuer selbstschalter
DE3213090C2 (de) * 1982-04-07 1985-10-31 Matsushita Electric Works, Ltd., Kadoma, Osaka Auslöser für einen Schutzschalter
ZA936632B (en) * 1992-09-14 1994-03-30 Circuit Breaker Ind An electro-magnetic device
ATE189938T1 (de) * 1994-01-17 2000-03-15 Circuit Breaker Ind Betätigungsvorrichtung für leistungsschalter
AT405113B (de) * 1996-06-14 1999-05-25 Felten & Guilleaume Ag Oester Auslöse-einrichtung für ein überstrom-abschaltgerät
DE19915785A1 (de) * 1999-04-08 2000-10-12 Abb Patent Gmbh Elektromagnetischer Auslöser für ein elektrisches Schaltgerät
DE102006037233A1 (de) * 2006-08-09 2008-02-14 Siemens Ag Schutzschalter
CN101908420A (zh) * 2010-08-31 2010-12-08 无锡市凯旋电机有限公司 四线圈解锁式双稳态永磁机构

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US2551303A (en) * 1940-04-23 1951-05-01 Theunissen Francois Jean Marie Automatic circuit breaker
US3569879A (en) * 1969-12-08 1971-03-09 Ite Imperial Corp Circuit breaker trip unit assembly with auxiliary time delay armature
US3588763A (en) * 1970-02-26 1971-06-28 Gen Electric Circuit breaker with low short circuit magnetic tripping means
US3588762A (en) * 1970-02-25 1971-06-28 Gen Electric Circuit breaker with short circuit magnetic tripping means

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US2551303A (en) * 1940-04-23 1951-05-01 Theunissen Francois Jean Marie Automatic circuit breaker
US3569879A (en) * 1969-12-08 1971-03-09 Ite Imperial Corp Circuit breaker trip unit assembly with auxiliary time delay armature
US3588762A (en) * 1970-02-25 1971-06-28 Gen Electric Circuit breaker with short circuit magnetic tripping means
US3588763A (en) * 1970-02-26 1971-06-28 Gen Electric Circuit breaker with low short circuit magnetic tripping means

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4307358A (en) * 1977-11-08 1981-12-22 La Telemecanique Electrique Electromagnetic contactor is fitted with an electromagnet sensitive to over-currents, to cause the limitation and cut-off of excess currents
US4864262A (en) * 1988-08-12 1989-09-05 Westinghouse Electric Corp. Undervoltage trip device
CN1041971C (zh) * 1994-02-28 1999-02-03 断路器工业有限公司 一种用于断路器的电磁操纵装置
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Also Published As

Publication number Publication date
ATA719474A (de) 1975-11-15
FR2246052A1 (es) 1975-04-25
ES430451A1 (es) 1977-01-16
DK140817B (da) 1979-11-19
IT1022195B (it) 1978-03-20
FI58844B (fi) 1980-12-31
DD114169A5 (es) 1975-07-12
CH576188A5 (es) 1976-05-31
SE7412143L (es) 1975-04-01
SE396844B (sv) 1977-10-03
FI58844C (fi) 1981-04-10
JPS5060776A (es) 1975-05-24
ZA746037B (en) 1975-10-29
DK474074A (es) 1975-05-12
AT331338B (de) 1976-08-10
DE2348613C2 (de) 1975-11-06
NO743031L (es) 1975-04-28
DK140817C (es) 1980-05-05
BE820214A (fr) 1975-03-24
FI277674A (es) 1975-03-28
CS200174B2 (en) 1980-08-29
NO137029C (no) 1977-12-14
GB1486261A (en) 1977-09-21
NO137029B (no) 1977-09-05
FR2246052B1 (es) 1979-06-15
JPS5639013B2 (es) 1981-09-10
DE2348613B1 (de) 1975-03-20

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