CN111696795A - Electrical device for establishing or breaking a current in an electrical circuit - Google Patents
Electrical device for establishing or breaking a current in an electrical circuit Download PDFInfo
- Publication number
- CN111696795A CN111696795A CN202010180336.6A CN202010180336A CN111696795A CN 111696795 A CN111696795 A CN 111696795A CN 202010180336 A CN202010180336 A CN 202010180336A CN 111696795 A CN111696795 A CN 111696795A
- Authority
- CN
- China
- Prior art keywords
- contacts
- movable
- contact
- neutral
- fixed
- 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
Links
- 230000007935 neutral effect Effects 0.000 claims abstract description 73
- 238000003466 welding Methods 0.000 claims abstract description 5
- 238000005452 bending Methods 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 6
- 230000005526 G1 to G0 transition Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/002—Details of electromagnetic relays particular to three-phase electromagnetic relays
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/001—Means for preventing or breaking contact-welding
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/54—Contact arrangements
- H01H50/546—Contact arrangements for contactors having bridging contacts
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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
- H01H71/002—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00 with provision for switching the neutral conductor
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
- Relay Circuits (AREA)
- Contacts (AREA)
- Breakers (AREA)
Abstract
The invention relates to an electrical device comprising: at least two pairs of fixed contacts (1 to 8) and two bridges (P) of movable contacts (9, 13) associated with each pair of fixed contacts, the bridges of the two movable contacts being movable between a first position in which they electrically connect the two fixed contacts and a second position in which the current between the two fixed contacts is interrupted, the bridges P of the movable contacts being mounted in a contact holder (14) allowing the bridges of all the movable contacts to move simultaneously. The device is characterized in that the opening distance between the fixed neutral contact (1, 5) on the one hand and the movable neutral contact (9, 13) on the other hand is respectively smaller than the opening distance between the fixed contact (2, 3, 4, 6, 7, 8) of the or each phase and the corresponding movable contact of the or each phase, so that during opening of the contactor, when the two respective fixed and movable contacts of the phase line are welded together, the two movable neutral contacts (9, 13) remain closed, so that the neutral remains electrically conductive even if the contact holder (14) becomes deflected after welding the two respective fixed and movable phase contacts together.
Description
Technical Field
The invention relates to an electrical device for establishing or breaking a current in an electrical circuit, the device comprising: at least two pairs of fixed contacts, each pair comprising two fixed contacts electrically connected to an upstream terminal and a downstream terminal of the device, respectively; and, associated with each pair of fixed contacts, a bridge of two movable contacts, which is movable between a first position, in which it electrically connects the two fixed contacts, and a second position, in which the flow of current between the two fixed contacts is interrupted, the bridges of these movable contacts being mounted in a contact holder that allows the bridges of all the movable contacts to move simultaneously, one of the pairs of fixed contacts and its associated movable contact bridge being located on the line of the transfer neutral, the other pair or pairs of fixed contacts and its associated movable contact bridge being respectively on the line of one of the transfer phases or phases.
Background
Such devices, called "contactors", are known, which are electrical devices for establishing or interrupting the flow of electric current by means of an electric or pneumatic control unit.
Depending on its use, the contactor may be a unipolar, bipolar, tripolar or even a quadrupole contactor. In other words, the contactor has one to four power contacts for withstanding an arc generated by a large current when opened or closed.
In such contactors, all movable contacts are mounted in one and the same support, so that they can be moved simultaneously when a closing or opening command is issued to the contactor. Such contactors can be actuated manually or by means of a coil through which an electric current can pass and which can interact with a fixed armature rigidly connected to the fixed contacts of the contactor and a movable armature rigidly connected to the movable contacts of the contactor. Therefore, when no current flows through the coil, the fixed armature does not exert a magnetic attraction force on the movable armature: the magnetic circuit is open. When sufficient current flows through the coil, the fixed armature attracts and seats against the movable armature: the magnetic circuit is closed. Thus, the movement of the movable armature drives the opening and closing of the contacts.
When the device comprises a neutral wire, for example a four-pole device comprising three phase and one neutral wire, the neutral wire is formed in the same way as the phase wires, i.e. it comprises two fixed contacts electrically connected to the two terminals respectively, and a bridge of movable contacts forming two movable contacts capable of interacting with the two fixed contacts respectively.
However, the more and more frequent use of LED lamps in electrical circuits puts higher demands on the contacts, since the inrush current of LED lamps is large and may wear the electrical contacts.
In a three-phase contactor comprising one neutral and three phase lines, adjacent contacts remain conductive while the phase electrical contacts remain in place when the contactor is opened, and the neutral contact opens after the contact holder becomes tilted. A phase-to-phase voltage is then established between the phase lines, which can damage the customer's electrical load.
The present invention overcomes these problems and provides an electrical device for establishing or breaking current in an electrical circuit that maintains the continuity of the neutral line even when the electrical contacts remain in place when the contactor is opened.
Disclosure of Invention
To this end, the subject of the invention is an electrical apparatus of the type described above, which is characterized in that the opening distance between the fixed neutral contact of one side and the movable neutral contact of the other side is respectively smaller than the opening distance between the fixed contact of the or each phase and the corresponding movable contact of the or each phase, so that during opening of the contactor, when the two respective fixed and movable contacts of the phase line are welded together, the two movable neutral contacts remain closed, so that the neutral remains electrically conductive even if the contact holder becomes deflected after welding the two respective fixed and movable phase contacts together.
According to a particular feature, the opening distance between each fixed neutral contact and its associated movable neutral contact is in the range of approximately 80% of the opening distance between each movable phase contact and its associated stationary phase contact to approximately 40% of the opening distance of the phase contact.
According to another feature, the opening distance between the neutral contacts corresponds substantially to 70% of the opening distance of the phase contacts.
According to another feature, the opening distance between the stationary phase contact and the movable phase contact is substantially 2.5mm, while the opening distance between the stationary neutral contact and the movable neutral contact is substantially 2 mm.
According to another feature, the reduced opening distance of the neutral contact is achieved by increasing the thickness of the contact pad associated with the fixed neutral contact and/or by increasing the thickness of the contact pad associated with the movable neutral contact.
According to another feature, the thickness of the pad of the movable neutral contact is in the range 0.9mm to 1.4 mm.
According to another feature, the electrical apparatus is a contactor rated for 40A current, the opening distance of the movable phase contact is 2.5mm and the opening distance of the fixed neutral contact is 2 mm.
According to another embodiment, the reduced opening distance of the fixed and movable neutral contacts is achieved by bending or deforming the fixed neutral contact and/or by bending or deforming the fixed and movable neutral contacts.
Drawings
However, other advantages and features of the present invention will become more apparent in the following detailed description, taken with reference to the accompanying drawings, which are given by way of example only, and in which:
figure 1 is a perspective view of a contactor according to the present invention with the contacts in an open position;
FIG. 2 is a left side view of FIG. 1;
FIG. 3 is a front view of the apparatus of FIG. 1, with the contacts in a closed position during normal operation of the apparatus;
FIG. 4 is a front view of the apparatus at the beginning of the three phase open neutral closed position during normal operation of the apparatus;
FIG. 5 is a front view of the device in an open position during normal operation;
FIG. 6 is a front view of a device according to the prior art, during opening of the device, one of the phases being welded together while the other adjacent phase is conducting;
FIG. 7 is a front view of an apparatus according to the present invention during opening of the apparatus with one of the phases welded together and the other adjacent phase and neutral conductive; and is
Fig. 8 is a perspective view showing an outer portion of the electrical contact.
Detailed Description
Fig. 1 to 8 show an electrical contactor C rated for a current of 40A. In a manner known per se, this contactor C is housed in a substantially parallelepiped housing B comprising a back face for attachment to the mounting rail, a front face forming the nose, two side faces by which the contactor can be attached to other equipment of the same type on the rail, and two upper and lower faces comprising respectively a set of downstream terminals and a set of upstream terminals.
According to this particular illustrated embodiment of the invention, the device is a four-pole device and houses four wires, namely a neutral wire and three phase wires. Associated with each of these electric lines are an upstream terminal and a downstream terminal for electrical connection to the power supply means (for the upstream terminal) and to the output device (for the downstream terminal) via a wire or comb (comb).
Each electric phase line comprises: two fixed contacts 2, 6; 3. 7; 4. 8 electrically connected to the downstream terminal and the upstream terminal, respectively; and a bridge P (fig. 2) of the two movable contacts 9, 10, 11, 12, 13, respectively for interacting with the two fixed contacts. All contacts comprise contact pads p, n in the contact area. All the fixed contacts 1 to 8 are electrically and mechanically connected to the connection pads of the corresponding terminals through their ends located opposite to the movable contacts 9 to 13.
The bridges P of all the movable contacts of the device are mounted in one and the same support, called contact holder 14, which contact holder 14 can be moved between the two positions mentioned above by manual or electromagnetic control means.
According to the invention, as shown in fig. 1 to 8 (except in fig. 6), the opening distance e between the fixed neutral contacts 1, 5 on one side and the associated movable contacts 9, 13 on the other side is smaller than the opening distance d between the fixed phase contacts 2, 3, 4, 6, 7, 8 and their associated movable contacts 10, 11, 12, so that when the two contacts 4, 12 of the phase line are welded together during opening of the contactor, the neutral contacts 1, 9 and 5, 13 remain closed, so that the neutral remains electrically conductive even if the contact holder 14 becomes deflected after welding the two contacts together.
According to this embodiment shown in fig. 1 to 5 and 7, the opening distance e between a fixed neutral contact 1, 5 and an associated movable neutral contact 9, 13 is in the range of approximately 80% to approximately 40% of the opening distance d between a fixed phase contact 2, 3, 4, 6, 7, 8 and an associated movable phase contact 10, 11, 12. Advantageously, this opening distance e between two neutral contacts will be 70% of the above mentioned distance.
According to the shown embodiment of the invention, the contactor has an opening distance of 2.5mm on the three phase lines L1, L2 and L3 and an opening distance of 2mm on the neutral line N.
In this illustrated embodiment, this reduced opening distance between the fixed neutral contact and the associated movable neutral contact is achieved by increasing the thickness of the contact pad n of the movable neutral contact 9, 13 to obtain the required opening distance.
The operation of the contactor C according to the present invention will be described with reference to fig. 1 to 8.
In fig. 1 and 2, the contactor is in the open position, all movable contacts 9 to 13 are open, establishing opening distances e, d with respect to their associated fixed contacts 1 to 8. This opening distance between the neutral contacts is smaller than the opening distance between the phase contacts.
In fig. 3, the contactor is in a closed position, which corresponds to all movable contacts 9 to 13 being in contact with their associated fixed contacts 1 to 8, respectively.
In fig. 4, the contactor is in a so-called intermediate open position, in which the movable phase contacts 10, 11, 12 start to open, while the movable neutral contacts 9 and 13 are still closed due to the difference in opening distance as described above.
In fig. 5, the contactor is in the open position, with all movable contacts 9 to 12 separated from their respective fixed contacts 1 to 4.
Fig. 3, 4 and 5 correspond to the contactor in normal operation, i.e. without the movable contacts welded together.
In fig. 6, the contactor according to the prior art is in the opening process, the movable contact 12 of the third phase is welded to the fixed contact 4 of the same phase. In this case, welding the stationary phase contact to the movable phase contact causes the contact holder 14 to become deflected, which in turn causes the movable neutral contacts 9, 13 to open and the neutral to open.
In fig. 7, the contactor is a contactor according to the present invention in a case where the movable phase contact 12 is welded to the corresponding fixed contact 4, causing the contact holder 14 to become deflected. In this case, however, the movable neutral contact remains in contact with the fixed neutral contacts 1, 5, as a result of the increased thickness of the contact pad n associated with the movable neutral contact 9, 13, resulting in the neutral remaining electrically conductive.
According to a variant embodiment, the reduced opening distance e of the fixed and movable neutral contacts 9, 13 is achieved by bending or deforming the fixed neutral contacts 1, 5 and/or by bending or deforming the fixed and movable neutral contacts 9 or 13.
Thus, by means of the invention, an electrical device for establishing or breaking a current in an electrical circuit is obtained, whereby even if the phase electrical contacts remain in place when opening the contactor, neutral electrical continuity can be maintained due to the smaller contact opening distance in neutral relative to the phases.
Of course, the invention is not limited to the embodiments described and shown, which are given by way of example only.
Thus, although in the described embodiments the pad of the movable neutral contact exhibits an increased thickness, it is also conceivable to increase the thickness of the pad of the fixed neutral contact, or even of both the pad of the fixed contact and the pad of the movable contact.
On the contrary, the invention includes all technical equivalents of the means described and combinations thereof, as long as they are implemented according to the spirit of the invention.
Claims (8)
1. An electrical device for establishing or breaking a current in an electrical circuit, the device comprising: at least two pairs of fixed contacts, each pair comprising two fixed contacts electrically connected to an upstream terminal and a downstream terminal of the device, respectively; and, associated with each pair of fixed contacts, a bridge of two movable contacts, which can move between a first position, in which it electrically connects the two fixed contacts, and a second position, in which the current between the two fixed contacts is interrupted, the bridges of these movable contacts being mounted in a contact holder that allows the bridges of all the movable contacts to move simultaneously, respectively one pair of fixed contacts and its associated movable contact bridge lying on the line of the transfer neutral, the other pair of fixed contacts or the other pair of fixed contacts and its associated movable contact bridge lying on the line of one of the transfer phases or phases, characterized in that the fixed neutral contact (1, 5) on one side and the movable neutral contact (9) on the other side, 13) The opening distance (e) between them is smaller than the opening distance (d) between the fixed contact (2, 3, 4, 6, 7, 8) of the or each phase L1, L2, L3 and the corresponding movable contact (10, 11, 12) of the or each phase, respectively, so that during opening of the contactor, when the two respective fixed and movable contacts (4, 12) of the phase lines are welded together, the two movable neutral contacts (9, 13) remain closed, so that the neutral remains electrically conductive even if the contact holder (14) becomes deflected after welding the two respective fixed and movable phase contacts together.
2. The electrical apparatus according to claim 1, wherein the opening distance (e) between each fixed neutral contact (1, 5) and its associated movable neutral contact (9, 13) is in the range of approximately 80% of the opening distance (d) between each movable phase contact (10 to 12) and its associated fixed phase contact (2, 3, 4, 6, 7, 8) to approximately 40% of the opening distance (d) of the phase contact.
3. An electric device according to claim 2, characterized in that the opening distance (e) between the neutral contacts corresponds substantially to 70% of the opening distance (d) of the phase contacts.
4. An electric device according to any one of claims 1-3, characterized in that the opening distance (d) between the stationary phase contact (2, 3, 4, 6, 7, 8) and the movable phase contact (10-12) is substantially 2.5mm, and the opening distance (e) between the stationary and movable neutral contacts (9, 13) is substantially 2 mm.
5. Electrical device according to any one of the preceding claims, characterised in that the reduced opening distance (e) of a neutral contact (9, 13) is achieved by increasing the thickness of the contact pad associated with the fixed neutral contact (1, 5) and/or by increasing the thickness of the contact pad (n) associated with the movable neutral contact (9, 13).
6. An electric device according to any one of claims 1-5, characterized in that the thickness of the pad of the movable neutral contact (9, 13) is in the range of 0.9-1.4 mm.
7. The electrical apparatus according to any one of the preceding claims, wherein the electrical apparatus is a contactor rated for 40A current, the opening distance (d) of the stationary and movable phase contacts (10, 11, 12) being 2.5mm and the opening distance (e) of the stationary and movable neutral contacts (9, 13) being 2 mm.
8. Electrical device according to any one of claims 1-4, characterised in that the reduced opening distance (d) of the fixed and movable neutral contacts (9, 13) is achieved by bending or deforming the fixed neutral contacts (1, 5) and/or by bending or deforming the movable neutral contacts (9, 13).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1902611 | 2019-03-14 | ||
| FR1902611A FR3093857B1 (en) | 2019-03-14 | 2019-03-14 | ELECTRICAL APPARATUS INTENDED TO ESTABLISH OR INTERRUPT THE CURRENT IN AN ELECTRIC CIRCUIT. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111696795A true CN111696795A (en) | 2020-09-22 |
| CN111696795B CN111696795B (en) | 2024-10-25 |
Family
ID=67810709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010180336.6A Active CN111696795B (en) | 2019-03-14 | 2020-03-16 | Electrical device for establishing or breaking a current in an electrical circuit |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3709323B1 (en) |
| CN (1) | CN111696795B (en) |
| ES (1) | ES2874754T3 (en) |
| FR (1) | FR3093857B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115440517A (en) * | 2021-06-01 | 2022-12-06 | Abb瑞士股份有限公司 | electrical switch |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6747532B1 (en) * | 2002-12-23 | 2004-06-08 | General Electric Company | Method, system and apparatus for employing neutral poles in multipole circuit breakers |
| CN201732750U (en) * | 2010-07-28 | 2011-02-02 | 常熟开关制造有限公司(原常熟开关厂） | Rotary type double-breakpoint quadrupole molded case circuit breaker |
| US20110168535A1 (en) * | 2010-01-13 | 2011-07-14 | Ls Industrial Systems Co., Ltd. | POWER TRANSMISSION MECHANISM FOR four poles CIRCUIT BREAKER |
| CN202384267U (en) * | 2010-08-05 | 2012-08-15 | 施耐德电器工业公司 | Moving contact system and electric switch device |
| CN103247499A (en) * | 2012-02-03 | 2013-08-14 | Abb公司 | Hybrid current switching device |
| EP3261105A1 (en) * | 2016-06-24 | 2017-12-27 | Hager-Electro SAS (Société par Actions Simplifiée) | Electric line protection apparatus |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2644634A1 (en) * | 1989-03-07 | 1990-09-21 | Matsushita Electric Works Ltd | Electromagnetic contactor |
| FR2838556B1 (en) * | 2002-04-10 | 2004-09-10 | Schneider Electric Ind Sa | ELECTRIC SWITCHING APPARATUS |
| EP2226820B1 (en) * | 2009-03-05 | 2016-01-27 | Rockwell Automation Technologies, Inc. | Switching phase offset for contactor optimization |
-
2019
- 2019-03-14 FR FR1902611A patent/FR3093857B1/en not_active Expired - Fee Related
-
2020
- 2020-02-17 EP EP20157565.1A patent/EP3709323B1/en active Active
- 2020-02-17 ES ES20157565T patent/ES2874754T3/en active Active
- 2020-03-16 CN CN202010180336.6A patent/CN111696795B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6747532B1 (en) * | 2002-12-23 | 2004-06-08 | General Electric Company | Method, system and apparatus for employing neutral poles in multipole circuit breakers |
| US20110168535A1 (en) * | 2010-01-13 | 2011-07-14 | Ls Industrial Systems Co., Ltd. | POWER TRANSMISSION MECHANISM FOR four poles CIRCUIT BREAKER |
| CN201732750U (en) * | 2010-07-28 | 2011-02-02 | 常熟开关制造有限公司(原常熟开关厂） | Rotary type double-breakpoint quadrupole molded case circuit breaker |
| CN202384267U (en) * | 2010-08-05 | 2012-08-15 | 施耐德电器工业公司 | Moving contact system and electric switch device |
| CN103247499A (en) * | 2012-02-03 | 2013-08-14 | Abb公司 | Hybrid current switching device |
| EP3261105A1 (en) * | 2016-06-24 | 2017-12-27 | Hager-Electro SAS (Société par Actions Simplifiée) | Electric line protection apparatus |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115440517A (en) * | 2021-06-01 | 2022-12-06 | Abb瑞士股份有限公司 | electrical switch |
Also Published As
| Publication number | Publication date |
|---|---|
| EP3709323B1 (en) | 2021-05-19 |
| FR3093857B1 (en) | 2021-02-19 |
| FR3093857A1 (en) | 2020-09-18 |
| EP3709323A1 (en) | 2020-09-16 |
| ES2874754T3 (en) | 2021-11-05 |
| CN111696795B (en) | 2024-10-25 |
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