CH415809A - Overcurrent and differential action circuit breaker - Google Patents
Overcurrent and differential action circuit breakerInfo
- Publication number
- CH415809A CH415809A CH680465A CH680465A CH415809A CH 415809 A CH415809 A CH 415809A CH 680465 A CH680465 A CH 680465A CH 680465 A CH680465 A CH 680465A CH 415809 A CH415809 A CH 415809A
- Authority
- CH
- Switzerland
- Prior art keywords
- circuit breaker
- action
- differential action
- overcurrent
- differential
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
- H01H83/20—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
- H01H83/02—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by earth fault currents
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/33—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
Description
Disjoncteur ä surintensite et ä action differentielle Overcurrent and differential action circuit breaker
Les disjoncteurs connus ä surintensite compren nent generalement un interrupteur ä ouver ture auto matique, qui est aetionne par an dispositif thermique dans 1e cas oü le courant atteint progressivement la valeur maximu:m autorisee, ou par un dispositif elec tromagn6tique Jans 1e cas d'un courant de court circuit, lequel atteint momentanement plusieurs fois la valeur du courant maximum. Known overcurrent circuit breakers generally comprise an automatic opening switch, which is activated by a thermal device in the case where the current gradually reaches the maximum authorized value, or by an electromagnetic device in the case of a short-circuit current, which momentarily reaches several times the value of the maximum current.
Il existe egalement des disjoneteurs ä action diffe rentielle, dans lesquels un dispositif compare l'equi ,libre entre 1e courant d'un conducteur et celui de 1'au tre condueteur Jans le cas dune alimentation mono phas6e, ou encore 1'equilibre du courant des trois phases dans 1e cas d'un reseau triphase. Lorsqu'un desequi@libre depassant une valeur predeterminee est detecte, ce desequi@libre provenant generalement dune mise ä terre accidentelle, 1e disjoncteur differentiel coupe 1'alimentation. There are also differential action circuit breakers, in which a device compares the free balance between the current of one conductor and that of the other conductor in the case of a single-phase supply, or else the balance of the current of the three phases in the first case of a three-phase network. When a free imbalance exceeding a predetermined value is detected, this imbalance generally coming from an accidental grounding, the differential circuit breaker cuts off the power supply.
Il existe aussi des disjonet@eurs combines d6clen chant sofft .par action differentielle, sofft en ralson dune surintensite. There are also combination circuit breakers with soft edge tripping by differential action, soft as a result of an overcurrent.
Dans la pratique, il est beaucoup plus frequent que 1e fonctionnement d'un disjoneteur sait rendu necessaire par Suite dune decharge du circuit qui contröle, ou par Suite d'un court-cireuit plutöt qu'en rai,son d'.un desequilibre de courant provenant d'un defaut d'isolation, ou d'un autre accident. In practice, it is much more common for the operation of a circuit breaker to become necessary as a result of a discharge of the circuit which controls it, or as a result of a short circuit, rather than as a result of an imbalance of current from an insulation fault or other accident.
I.1 est avantageux que 1'usager ou 1e surveillant sofft averti lorsqu'un deelenchement a ete provoque par une aotion differentielle, car cela signifie g6n6ra lement qu'un appareil electrique ou l'installation pre sente un defaut et qu'il est necessaire de proceder ä un contröle souvent severe pour 1e detecter. It is advantageous for the user or the supervisor to be warned when a tripping has been caused by a differential action, because this generally means that an electrical device or the installation has a fault and that it is necessary to carry out an often severe check to detect it.
La @presente invention a pour objet un disjoneteur ä surintensite .et ä action differentielle, caraeterise en The subject of the present invention is a circuit breaker with overcurrent and differential action, characterized in
ce qu'il cornprend un element indicateur destine ä si gnaler ä 1'usager si .1e deelenchement du disjoncteur a ete provoque par une surintensite ou par aetion differentielle. what it includes an indicator element intended to signal to the user if the tripping of the circuit breaker has been caused by an overcurrent or by differential action.
Le dessin annexe represente, schematiquement et ä titre d'exemple, une forme -d'execution de 1'objet de 1'invention. The appended drawing represents, schematically and by way of example, one form of execution of the object of the invention.
La fig. 1 est une vue en elevation avec coupe par tielle de cette .forme d'executmon. fig. 1 is an elevational view with partial section of this form of execution.
La fig. 2 est une vue analogue montrant une autre position de fonetionnement. fig. 2 is a similar view showing another operating position.
En reference ä la fig. 1, 1e :disjoncteur .comprend un premier boitier forme par un socle 1 surmonte d'un couvercle 2. Ce premier boitier conbient un inter rupteur ä ouverture automatique du type bien connu ä genouitIlere, cet interrupteur eta-nt muni .d'un bou .ton de commande manuelle 28. Lette geno@uillere peut etre actionnee sofft par un dispositif therm:ique consti tue par un bilame, soit par un dispositif electromagne tique. Ces differents elemenros n'ont pa-s ete repr6sen t6s au dessin, ear i:ls sont bien connus en eux-mernes. Seule, une partie du noyau 3 du dispositif electro magn6tique est visible ä La Base du soele 1, ce noyau etant dest'me ä etre deplaoe vers la @droite pour provo quer <B>l</B>e declenchernent du .disjoncteur. Ce noyau est, comme an 1e sait, entoure d':une bobine parcourue par 1e courant de phase traversant 1e disjoncteur. With reference to fig. 1, 1st: circuit breaker includes a first box formed by a base 1 surmounted by a cover 2. This first box conbient an automatic opening switch of the well-known knee-jerk type, this switch was provided with a bou .ton manual control 28. Lette geno @ uillere can be actuated sofft by a device therm: ic consti kills by a bimetallic strip, or by a tick electromagnetic device. These different elements have not been represented in the drawing, since they are well known in themselves. Only part of the core 3 of the electromagnetic device is visible at the base of the core 1, this core being intended to be moved to the right to cause the tripping of the circuit breaker. This core is, as known, surrounded by: a coil traversed by the first phase current passing through the first circuit breaker.
Le so@ole 1 est fixe Sur un second socle 4 auquel il est relie par des vis dont l'une 5 est visible au dessin, ces vis oonstituant egaiement ne Liaison e1ec trique entre les ,61ements contenus Jans le premier boitier et ceux fixäs @sur 1e socle 4. Ce dernier poste un transformateur differentiel 6 qui präsente, comme an 1e samt, au moins deux enroulements bobines en sens inverse et parcourus par les courants dont an The so@ole 1 is fixed on a second base 4 to which it is connected by screws, one of which 5 is visible in the drawing, these screws also constituting no electrical connection between the elements contained in the first box and those fixed @ on the first base 4. The latter posts a differential transformer 6 which presents, as in the first samt, at least two coil windings in opposite direction and traversed by the currents of which
veut contröler 1'6qunlibre, et un troiszeme enro.ulement dans lequel aucune tension West induite lorsque les eourants dann les d eux Premiers enroulements sont dgaux. Si, par eontre, une -diff6rence se produit dans les courants tnaversant les deux ipremiers ernrou le ments, une tension est .induite dans 1e troisieme en-* roulement, catte tension etant .appliqu6e ä un relais 7 et faisant fonctionner celui-ci des quelle atteint une valeur pr6determinee. wants to control free balance, and a third winding in which no voltage is induced when the currents in the first two windings are equal. If, on the other hand, a difference occurs in the currents passing through the first two windings, a voltage is induced in the third winding, this voltage being applied to a relay 7 and causing it to operate which reaches a predetermined value.
Le relais 7 comprend une bobine 8 plac6e sur la Partie fixe d'un circuit magn6tique form6 par les pie ces 9 et 10. Une armature mobile 11 @pivote sur 1'ex tr6mit6 libre de la pike 10 et est retenue par-1'action d'un ressort, non repr6sent6, Aans la positnon repre sent6e ä la fig. 1. L'extremite supdrileure de 1'arma ture 11 pr6sente un 6paulement 12 retenant un levier 13 ä deux bras eontre 1'action d'un ressort de rappel 14 enrou16 autour de faxe de pivotement 15 du levier 13. Relay 7 comprises a coil 8 placed on the fixed part of a magnetic circuit formed by parts 9 and 10. of a spring, not represented, in the position shown in FIG. 1. The upper end of the armature 11 has a shoulder 12 retaining a two-armed lever 13 against the action of a return spring 14 wound around the pivot pin 15 of the lever 13.
Lorsqu'un d6s6quilibre d'importance suffisante se fait sentir Jans 1e transformateur diff6rentiel 6, 1e relais 7 fonctionne et son armature 11 prend la Posi tion repr6sent6e ä la fig. 2. L'epaulement 12 libere a:@hsi 1e levier 13, lequel pivote auWur de 15 sous 1'action de son ressort 14. L'extr6mite sup6rieure du levier 13 pousse 1e noyau magn6tique 3 vers fa droite, ce qui provoque 1e declenchement de 1'interrupteur de la meme fagon que si un court-circuit avait eu lieu. When an unbalance of sufficient importance is felt in the differential transformer 6, the relay 7 operates and its armature 11 assumes the position shown in FIG. 2. The shoulder 12 releases at:@hsi the lever 13, which pivots around 15 under the action of its spring 14. The upper end of the lever 13 pushes the magnetic core 3 towards the right, which causes the tripping of the switch in the same way as if a short circuit had occurred.
Il y a llieu de noter qu e le ddplacement -du noyau magn6tique 3 vers la dromte deverrouille une liaison mäcanique ä genou 1lläre entre 1e bouton de commande manuelle 28 et 1'interrupteur du disjo#ncteur, ceoi de fagon connue. Ainsi, taut que 1e noyau magnetique 3 est pouss6 par Je levier 13, il West pas possible de re enclencher 1e disjoneteur en agi.ssant sur 1e bouton 28. Pour pouvoir enclencher ä nouveau le disjoneteur, il faut tout d'abord r6armer 1e levier 13, c'est-ä-dire 1e Tamener dans sa Position represent6e ä la fig. 1. Cette @op6ratix)n est effectude ä 1'aide d'un poussolir 16 qui est mont6 coulissant dans un orifice du socle 1 et qui est soumin ä ;l'action :d'un ressort 17 Je sollichant vers 1e haut. It should be noted that the movement of the magnetic core 3 towards the dome unlocks a mechanical knee-joint connection between the manual control button 28 and the circuit breaker switch, in a known manner. Thus, as long as the first magnetic core 3 is pushed by the lever 13, it is not possible to re-engage the circuit breaker by acting on the first button 28. In order to be able to re-engage the circuit breaker, the lever must first be reset. 13, that is to say the Bring to its Position represented in fig. 1. This @op6ratix)n is effectude 1'aide d'un pousolir 16 which is slidably mounted in an orifice of the base 1 and which is subjected to the action: of a spring 17 I sollichant upwards.
L'extremit6 inf6rieure,de ce poussoir 16 presente une tete 18, munie dune encoehe 19, et une Portion conique 20. Lorsque Je poussoir 16 est deplace vers 1e bas par une action manuelle de 1'usager pressant Sur sa Partie 21 qui Fait -saalhe,du couvercle 2, la tete 18 prend appuf Sur un Premier bec 22 du levier 13 et fait pivoter ce dernier oontre 1'action de son ressozt 14 jusqu'ä ce qu'il sofft retenu en position par 1'6pau lement 12 de 1'armature 11. Lorsque 1e poussoir 16 est relächd, il est rappeld vers 1e haut par 1e ressort 17, maus retenu Jans ce deplacement, apres une cer taine course, par 1'engagement d'un bec 23 du levier 13 qui s'engage Jans 1'encoche 19. The lower end of this pusher 16 has a head 18, provided with a notch 19, and a conical portion 20. When the pusher 16 is moved downwards by a manual action of the user pressing on its Part 21 which does - on the lid 2, the head 18 rests on a first beak 22 of the lever 13 and causes the latter to pivot against the action of its spring 14 until it is retained in position by the shoulder 12 of the the armature 11. When the pusher 16 is released, it is returned upwards by the spring 17, but retained in this displacement, after a certain stroke, by the engagement of a beak 23 of the lever engages Jans notch 19.
Ceci a pour avantage que 1e poussoir 16 occupe une position diff6rente de sa Position normale lorsque 1e dinpositif diNrentiel a fonctionne. En effet, son extrdmitd nup6rieure fait alors une saillie plus irapox tante du couvercle 2"comme le montre @la fig. 2, ce This has the advantage that the pusher 16 occupies a different position from its normal position when the differential device is operating. Indeed, its upper extremity then protrudes more close to the lid 2" as shown in FIG. 2, this
qui avartit Pusager que 1e declenchement n'a Pan eu Leu ä la suite -d'une surcharge ou d'un court-circuit, maus en raison dune d6fectuosit6 qui est plus diffi cäe ä d6teeter. which warns the user that the tripping has not taken place following an overload or a short-circuit, but due to a defect which is more difficult to detect.
Il y a lieu de remarquer encore que lorsque 1'usa ger appuie sur 1e bouton 16, la parbie conique <B>20</B> de celui-ei vient se placer en regard de 1'extrdmitd du noyau magnUique 3 et maintient celui-ci dans 8a Po sition de d6clenchement. It should also be noted that when the user presses the button 16, the conical part <B>20</B> of the latter comes to be placed opposite the extremity of the magnetic core 3 and maintains that 8a Triggering position.
Atinsi, 1e disjoncteur ne peut etre r6enolench6 par 1e bouton 28 qu'apräs avoir presse, puis reläch6, 1e poussoir 16. Thus, the circuit breaker can only be reactivated by button 28 after having pressed, then released, the push-button 16.
Si, au contraire, Je deolenchement du disjoncteur a 6te provoqud par une surintensitd, 1e levier 13 a conserv6 sa position repr6sentde ä la fig. 1, et 1e dis joncteur peut etre r6enclench6 simplement en agis sant sur Je bouton 28, saus avair ä effectuer 1'opfa tion suppl6mentaire de r6armement du levier 13. Cette op6ration isupplementaire est avantageuse, car eile conrribue ä attirer 1'attention de 1'usager iorsque Je ddclencheur a fonctionn6 par action diff6rentielle. Daus ce but, il est utile de @prdveir une Partie color6e sur 1e bouton 21, dispos6e de fagon ä n'etre visible qu'apres un d6olenchement par action diff6rentielle. If, on the contrary, the tripping of the circuit breaker has been caused by an overcurrent, the lever 13 has retained its position shown in FIG. 1, and the circuit breaker can be reset simply by acting on the button 28, without having to perform the additional operation of resetting the lever 13. This additional operation is advantageous because it helps to attract the attention of the operator. user when the release has operated by differential action. For this purpose, it is useful to provide a colored part on the button 21, arranged so as to be visible only after release by differential action.
A la Partie gauche de la fig. 1, an remarque en oore un contact 25, susceptible d'etre ferm6 par un poussoir 26 vouLssant Jans 1e socle 4 et susceptible d'etre actionn6 par un bouton 27 faisant isaillie d'un oouverole 24 coiffant l'ensemble. Cet arrangement est destind ä permebtre de cr6er artificiellement et volon tairement un d6s6quilibre dans <B>Je</B> transformateur 6 pour v6rifier 1e bon fonctionnement du dispoisitif de declenchement differentiel. On the left side of fig. 1, year notice in oore a contact 25, capable of being closed by a pusher 26 vouLssant Jans 1st base 4 and capable of being actionn6 by a button 27 making isaillie of a oouverole 24 covering the assembly. This arrangement is intended to allow the artificial and deliberate creation of an imbalance in the <B>I</B> transformer 6 to check the correct operation of the differential tripping device.
Il -est bien entendu que ton pourrait pr6voir dif ferentes variantes d'ex6cution et que notamment 1'616ment indicateur ne do-it pas ndcessairement etre constitud par Vorgane de rearmement du levier 13. 0n pourrait, par exemple, fahre porter ä ce levier une plaquette eolorde venant ne placer devant une fenetre lorsque 1e levier 13 a et6 d6place par Suite du fonc bionnement par action diffdrentielle. It is understood that you could provide for different variants of execution and that in particular the indicator element does not necessarily have to be constituted by the lever 13 reset member. eolorde plate from not place in front of a window when the first lever 13 has been moved as a result of the function by differential action.
0n pourrait aussi #prdvoir un contact sur l'une des :pieees mobiles propres au m6canisme de d6clenche ment diff6rentiel, ce contact ayant pour effet d'allu mer une lampe-t6moin branchde Sur 1'arriv6e du cou rant au disjoncteur. It would also be possible to provide a contact on one of the moving parts specific to the differential tripping mechanism, this contact having the effect of lighting a pilot light connected to the arrival of the current at the circuit breaker.
Claims (2)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH46266A CH428907A (en) | 1966-01-13 | 1966-01-13 | Over-current circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH415809A true CH415809A (en) | 1966-06-30 |
Family
ID=4187561
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH680465A CH415809A (en) | 1966-01-13 | 1965-05-14 | Overcurrent and differential action circuit breaker |
| CH46266A CH428907A (en) | 1965-09-06 | 1966-01-13 | Over-current circuit breaker |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH46266A CH428907A (en) | 1965-09-06 | 1966-01-13 | Over-current circuit breaker |
Country Status (2)
| Country | Link |
|---|---|
| BE (1) | BE681127A (en) |
| CH (2) | CH415809A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2132129A1 (en) * | 1971-03-29 | 1972-11-17 | Bbc Brown Boveri & Cie | |
| FR2357053A1 (en) * | 1976-06-28 | 1978-01-27 | Merlin Gerin | Electric circuit breaker with contact position indicator - prevents re-engagement and premature reclosure of contacts following circuit breaking |
| FR2437692A1 (en) * | 1978-09-28 | 1980-04-25 | Merlin Gerin | Manually operated circuit breaker with overload cut=out - has earth fault current overload device and reset units as separate components which may be put together later |
| EP0145946A1 (en) * | 1983-11-24 | 1985-06-26 | BROWN, BOVERI & CIE Aktiengesellschaft | Line-protecting cut-out |
| FR2561819A1 (en) * | 1984-03-26 | 1985-09-27 | Telemecanique Electrique | ADDITIVE BLOCK COUPLABLE TO A CIRCUIT BREAKER |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2088489B1 (en) * | 1970-05-11 | 1976-04-16 | Minnesota Mining & Mfg | |
| IE71036B1 (en) * | 1990-02-23 | 1997-01-15 | Square D Co | A circuit breaker |
-
1965
- 1965-05-14 CH CH680465A patent/CH415809A/en unknown
-
1966
- 1966-01-13 CH CH46266A patent/CH428907A/en unknown
- 1966-05-16 BE BE681127D patent/BE681127A/xx unknown
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2132129A1 (en) * | 1971-03-29 | 1972-11-17 | Bbc Brown Boveri & Cie | |
| FR2357053A1 (en) * | 1976-06-28 | 1978-01-27 | Merlin Gerin | Electric circuit breaker with contact position indicator - prevents re-engagement and premature reclosure of contacts following circuit breaking |
| FR2437692A1 (en) * | 1978-09-28 | 1980-04-25 | Merlin Gerin | Manually operated circuit breaker with overload cut=out - has earth fault current overload device and reset units as separate components which may be put together later |
| EP0145946A1 (en) * | 1983-11-24 | 1985-06-26 | BROWN, BOVERI & CIE Aktiengesellschaft | Line-protecting cut-out |
| FR2561819A1 (en) * | 1984-03-26 | 1985-09-27 | Telemecanique Electrique | ADDITIVE BLOCK COUPLABLE TO A CIRCUIT BREAKER |
| EP0161946A1 (en) * | 1984-03-26 | 1985-11-21 | Telemecanique | Auxiliary module for connection to a circuit breaker |
Also Published As
| Publication number | Publication date |
|---|---|
| CH428907A (en) | 1967-01-31 |
| BE681127A (en) | 1966-10-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4008864A (en) | Locking mechanism for a safety belt | |
| EP0766280A2 (en) | Control and signal device for a protection circuit breaker | |
| FR2651915A1 (en) | ULTRA-FAST STATIC CIRCUIT BREAKER WITH GALVANIC ISOLATION. | |
| FR2535520A1 (en) | CURRENT CUTTING APPARATUS REMOTE CONTROL | |
| US6246304B1 (en) | Trip indicating circuit breaker | |
| FR2473222A1 (en) | ELECTRIC CIRCUIT SWITCH | |
| EP2975628A1 (en) | Signaling device fault in an electric power protection apparatus and apparatus having such a device | |
| CH415809A (en) | Overcurrent and differential action circuit breaker | |
| EP0199612B1 (en) | Multiphase interrupting device with remote control | |
| EP0161946B1 (en) | Auxiliary module for connection to a circuit breaker | |
| EP1542253A1 (en) | Signalling device indicating the triggering of an electrical protection device | |
| EP0147278B1 (en) | Thermal-magnetic tripping mechanism of a circuit breaker made of shape memory effect material | |
| EP0547928B1 (en) | Protective switch | |
| FR2613531A3 (en) | DRIVE DEVICE FOR THE REMOTE ACTIVATION AND REMOVAL OF AN AUTOMATIC SWITCH | |
| EP0271181B1 (en) | Magnetic vacuum circuit breaker | |
| EP3249673B1 (en) | Mechanism for signalling an electrical fault in an electric protection device, and electric protection device including such a mechanism | |
| US3708771A (en) | Overload protection for electric motors | |
| EP0114542B1 (en) | Contactor with electromagnetically controlled action and automatic opening in case of over-voltage | |
| CA1274616A (en) | Device for selectively invalidating one or several actuating modes of apparatus manual controllers | |
| EP0310469B1 (en) | Protective switch with a screen for cutting the arc | |
| CH415808A (en) | Combined overcurrent and differential circuit breaker | |
| JPH0254824A (en) | Electric circuit breaker | |
| EP2642502B1 (en) | Trip unit for an electric protection apparatus and electric protection apparatus comprising one such unit | |
| FR2486304A1 (en) | Current protection switch with thermal and differential elements - provides over-current and fault current protection having release coupling between separate elements | |
| JPH0112372Y2 (en) |