CN107301928B - A Mechanical Interlock for Bypass Type Dual Power Transfer Switch - Google Patents
A Mechanical Interlock for Bypass Type Dual Power Transfer Switch Download PDFInfo
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- CN107301928B CN107301928B CN201610237209.9A CN201610237209A CN107301928B CN 107301928 B CN107301928 B CN 107301928B CN 201610237209 A CN201610237209 A CN 201610237209A CN 107301928 B CN107301928 B CN 107301928B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/20—Interlocking, locking, or latching mechanisms
- H01H9/26—Interlocking, locking, or latching mechanisms for interlocking two or more switches
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Abstract
一种设置于旁路开关和双电源转换开关之间的机械联锁，其中；旁路开关被设置在安装抽架上；双电源转换开关能够被摇进安装抽架或者从该安装抽架摇出；机械联锁安装在安装抽架上；常用电源与旁路开关和双电源转换开关分别并联连接；备用电源与旁路开关和双电源转换开关分别并联连接；当双电源转换开关被摇进安装抽架时，机械联锁可操作地连接在旁路开关和双电源转换开关之间，旁路开关和/或双电源转换开关使备用电源和常用电源的其中之一给负载供电，而另一个电源不给负载供电；当双电源转换开关被摇出安装抽架时，机械联锁与旁路开关和双电源转换开关断开，旁路开关使备用电源和常用电源的其中之一继续给负载供电，而另一个电源不给负载供电。
A mechanical interlock provided between a bypass switch and a dual power transfer switch, wherein; the bypass switch is provided on a mounting cradle; the dual power transfer switch can be rocked into and out of the mounting cradle The mechanical interlock is installed on the installation cradle; the common power supply is connected in parallel with the bypass switch and the dual power transfer switch; the backup power supply is connected in parallel with the bypass switch and the dual power transfer switch; When the cradle is installed, a mechanical interlock is operably connected between the bypass switch and the dual power transfer switch, which enables one of the backup power supply and the normal power supply to power the load while the other One power supply does not supply power to the load; when the dual power transfer switch is rolled out of the mounting cradle, the mechanical interlock is disconnected from the bypass switch and the dual power transfer switch, and the bypass switch allows one of the backup power supply and the common power supply to continue to be supplied. The load is powered, and the other power supply does not power the load.
Description
Technical Field
The present disclosure relates to a mechanical interlock, and more particularly, to a mechanical interlock for a bypass-type dual power transfer switch, i.e., a novel mechanical interlock disposed between a bypass switch and a dual power transfer switch.
Background
A dual power Transfer Switch (TSE) is used for switching two power supplies to ensure that important loads are continuously supplied with power. The bypass type of TSE is used for dual power transfer for particularly important loads so that power continues to be supplied to the load through the bypass switch during TSE service. Mechanical interlocks are an important functional mechanism of a TSE and are intended to prevent the simultaneous connection of two power sources to which the TSE is connected from causing a short circuit between the two power sources.
In a bypass-type dual power transfer switch, i.e., between the bypass switch and the dual power transfer switch, a mechanical interlock is also required that, when the TSE switches on one of the power sources, e.g., the regular power source, the mechanical interlock only allows the bypass switch to switch on the regular power source, but not the other power source, e.g., the backup power source. Similarly, when the bypass switch is connected with a common power supply, the TSE cannot be connected with a standby power supply when in operation, so that short circuit between the two power supplies cannot be caused by wrong operation in the using process of the equipment. Since the TSE needs to shake out of the drawer frame of the bypass type TSE due to maintenance and the like or needs to shake in the drawer frame in use, the coupling of the mechanical interlock and the TSE is floating, thereby causing the complexity of the mechanical interlock structure. Some manufacturers provide operational interlocks for the bypass switch from the TSE and lack them, with TSEs that cannot be manually operated to prevent safety issues with possible short circuits between the two power sources. Some manufacturers use electromagnetic interlocking structures, but cannot avoid short-circuiting between two power supplies due to human operation errors.
Disclosure of Invention
To address the above-mentioned deficiencies in the prior art, the present disclosure provides a mechanical interlock for a bypass-type dual power transfer switch, the mechanical interlock disposed between the bypass switch and the dual power transfer switch, wherein: the bypass switch is arranged on the mounting drawer frame; the dual power transfer switch can be swung into or out of the mounting drawer frame; the mechanical interlock is arranged on the mounting drawer frame; the common power supply is respectively connected with the bypass switch and the dual-power transfer switch in parallel; the standby power supply is respectively connected with the bypass switch and the dual-power transfer switch in parallel; the mechanical interlock is operably connected between the bypass switch and the dual power transfer switch when the dual power transfer switch is rocked into a mounting bay, the bypass switch and/or dual power transfer switch causing one of the backup power source and the common power source to power a load and the other of the backup power source and the common power source not to power the load; when the dual power supply change-over switch is shaken out to install the drawer frame, the mechanical interlock is disconnected with the bypass switch and the dual power supply change-over switch, the bypass switch enables the one of the standby power supply and the common power supply to continuously supply power to the load, and the other of the standby power supply and the common power supply does not supply power to the load.
The mechanical interlock is a multi-link mechanism.
The bypass switch is provided with: the bypass switch common power supply switch main shaft is used for driving a common power supply to be switched on or switched off; the bypass switch standby power supply switch main shaft is used for driving the standby power supply to be switched on or switched off; the bypass switch common power supply tripping rod is used for being driven to trip and trip the common power supply switch; and a bypass switch standby power supply opening tripping rod which is used for being driven to cause the standby power supply switch to trip and open.
The dual power transfer switch is provided with: the dual-power transfer switch is used for driving a common power supply to switch on or switch off; the main shaft of the standby power supply switch of the dual-power supply transfer switch is used for driving the switching-on or switching-off of the standby power supply; the dual-power transfer switch common power supply tripping rod is used for being driven to trip and trip the common power supply switch; and a dual power transfer switch standby power supply tripping rod which is used for being driven to trip the standby power supply switch.
The mechanical interlocks include a first mechanical interlock, a second mechanical interlock, a third mechanical interlock, and a fourth mechanical interlock; the first mechanical interlock comprises a first main shaft driven piece, a first connecting rod and a first brake release driving piece, and the first connecting rod is connected between the first main shaft driven piece and the first brake release driving piece; the second mechanical interlock comprises a second main shaft driven piece, a second connecting rod and a second shunt tripping driving piece, and the first connecting rod is connected between the second main shaft driven piece and the second shunt tripping driving piece; the third mechanical interlock comprises a third main shaft driven piece, a third connecting rod and a third brake release driving piece, and the third connecting rod is connected between the third main shaft driven piece and the third brake release driving piece; the fourth mechanical interlock comprises a fourth main shaft driven piece, a fourth connecting rod and a fourth brake tripping driving piece, and the fourth connecting rod is connected between the fourth main shaft driven piece and the fourth brake tripping driving piece.
The first mechanical interlock and the second mechanical interlock are operably connected on one side of the bypass switch and the dual power transfer switch; the third mechanical interlock and the fourth mechanical interlock are operably connected on the other side of the bypass switch and the dual power transfer switch.
The mechanical interlock and the bypass switch have the following mating relationship:
the bypass switch standby power supply opening tripping rod is matched with the inclined plane of the fourth brake opening tripping driving piece;
the main shaft of the bypass switch standby power switch is matched with the opening of the third main shaft driven part;
the common power supply tripping rod of the bypass switch is matched with the inclined plane of the second tripping driving piece;
the bypass switch commonly uses the opening that the main shaft of the power switch matches the first main shaft driven piece.
When the dual power transfer switch is rocked into a mounting drawer, the mechanical interlock and the dual power transfer switch have the following mating relationship:
the standby power supply brake-separating tripping rod of the dual-power transfer switch automatically enters the inclined plane of the first brake-separating tripping driving piece;
the main shaft of the standby power switch of the dual-power transfer switch automatically enters the opening of the driven part of the second main shaft;
the common power supply tripping rod of the dual-power transfer switch automatically enters the inclined plane of the third tripping driving piece;
the main shaft of the common power switch of the dual-power transfer switch automatically enters the opening of the driven part of the fourth main shaft.
In this way, the mechanical interlock is realized with the bypass switch and the dual power transfer switch.
When the dual-power transfer switch is shaken out to be installed with the drawing frame, if the dual-power transfer switch is powered by a standby power supply before, the second mechanical interlock causes the closing operation of the bypass switch common power supply switch to be invalid, at the moment, the second main shaft is driven by the driving piece to rotate to the closing position under the driving of the dual-power transfer switch standby power supply switch main shaft, and drives the second disconnecting switch tripping driving piece to rotate to the tripping position through the second connecting rod, at the moment, the closing operation of the common power supply connected with the bypass switch is invalid, and the standby power supply connected with the bypass switch can be closed because the bypass switch standby power supply disconnecting rod is not controlled by any mechanical interlock.
If the dual-power transfer switch is powered by a common power supply before, the fourth mechanical interlock causes the closing operation of the standby power supply switch of the bypass switch to be invalid, at the moment, the fourth main shaft is driven by the driving piece to rotate to the closing position under the driving of the main shaft of the common power supply switch of the dual-power transfer switch, and the fourth main shaft drives the fourth tripping driving piece to rotate to the tripping position through the fourth connecting rod, at the moment, the closing operation of the standby power supply connected with the bypass switch is invalid, and the common power supply connected with the bypass switch can be closed because the tripping rod of the common power supply switch of the bypass switch is not controlled by any mechanical interlock.
When the dual-power transfer switch is shaken into the installation extraction frame, if the bypass switch is powered by a standby power supply before, the third mechanical interlock causes the closing operation of the dual-power transfer switch common power supply switch to be invalid, at the moment, the third main shaft is driven by the driving piece to rotate to the closing position under the driving of the bypass switch standby power supply switch main shaft, and the third connecting rod drives the third tripping driving piece to rotate to the tripping position, at the moment, the closing operation of the common power supply connected with the dual-power transfer switch is invalid, and the standby power supply connected with the dual-power transfer switch can be closed because the tripping rod of the dual-power transfer switch standby power supply switch is not controlled by any mechanical interlock.
If the bypass switch is powered by a common power supply before, the first mechanical interlocking causes the closing operation of the dual-power-supply changeover switch standby power supply switch to be invalid, at the moment, the first main shaft is driven by the driving piece to rotate to the closing position under the driving of the bypass switch common power supply switch main shaft, and the first switching-off tripping driving piece is driven by the first connecting rod to rotate to the tripping position, at the moment, the closing operation of the standby power supply connected with the dual-power-supply changeover switch is invalid, and the common power supply connected with the dual-power-supply changeover switch can be closed because the dual-power-supply changeover switch common power supply tripping rod is not controlled by any mechanical interlocking.
The mechanical interlock provided by the present disclosure is a multi-link mechanism that is simpler in structure, more reliable in performance, and more convenient to install.
According to the mechanical interlock provided by the disclosure, when the dual power transfer switch is connected with one power supply, such as a common power supply, the mechanical interlock only allows the bypass switch to be connected with the common power supply, but cannot be connected with the other power supply, such as a standby power supply. Similarly, when the bypass switch is connected with a common power supply, the dual-power-supply changeover switch cannot be connected with a standby power supply when in operation, so that short circuit between the two power supplies cannot be caused by wrong operation in the using process of the equipment.
So that the manner in which the above recited features of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings. There are, of course, embodiments of the invention that will be described below and which will form the subject matter of the claims appended hereto.
As such, those skilled in the art will appreciate that the conception upon which this disclosure is based may readily be utilized as a basis for the designing of other structures, methods and systems for carrying out the several purposes of the present invention. It is important, therefore, that the appended claims be regarded as including such equivalent constructions insofar as they do not depart from the spirit and scope of the present invention.
Drawings
The present invention will be better understood and its advantages will become more apparent to those skilled in the art from the following drawings. The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations and are not intended to limit the scope of the present disclosure.
FIG. 1 illustrates the cooperation of first and second mechanical interlocks with a bypass switch and a dual power transfer switch in a mechanical interlock according to the present disclosure;
FIG. 2 is a simplified view of FIG. 1 with the first link omitted;
FIG. 3 illustrates a bypass switch according to the present disclosure;
FIG. 4 illustrates a dual power transfer switch according to the present disclosure;
FIG. 5 illustrates the cooperation of third and fourth mechanical interlocks with a bypass switch and a dual power transfer switch in a mechanical interlock according to the present disclosure;
fig. 6 is a simplified view of fig. 5, with the fourth link omitted.
Detailed Description
Technical solutions of the present disclosure will be described in detail below with reference to the accompanying drawings.
Fig. 1 illustrates the cooperation of first and second mechanical interlocks 1, 2 with a bypass switch 5 and a dual power transfer switch 6 in a mechanical interlock according to the present disclosure; fig. 2 is a simplified view of fig. 1, with the first link 1-1 omitted.
The mechanical interlock according to the present disclosure acts between a bypass switch 5 and a dual power transfer switch 6, wherein the bypass switch 5 is disposed on a mounting rack (not shown); the dual power transfer switch 6 can be swung into or out of the mounting drawer frame through a guide rail 7; the mechanical interlock is arranged on the mounting drawer frame; a common power source (not shown) is connected in parallel with the bypass switch and the dual power transfer switch, respectively; a backup power source (not shown) is connected in parallel with the bypass switch and the dual power transfer switch, respectively.
When dual power transfer switch 6 is swung into a mounting bay, the mechanical interlock is operably connected between bypass switch 5 and dual power transfer switch 6, and bypass switch 5 and/or dual power transfer switch 6 causes one of the backup power source and the common power source to power a load (not shown) and the other of the backup power source and the common power source to not power the load.
When the dual power transfer switch 6 is swung out of the installation rack, the mechanical interlock is disconnected from the bypass switch 5 and the dual power transfer switch 6, the bypass switch 5 enables the one of the standby power supply and the common power supply to continue to supply power to the load, and the other of the standby power supply and the common power supply does not supply power to the load.
The mechanical interlocks may be multi-bar linkages as described below in connection with fig. 1 and 2, and fig. 5 and 6, wherein the mechanical interlocks include a first mechanical interlock 1, a second mechanical interlock 2, a third mechanical interlock 3, and a fourth mechanical interlock 4.
As shown in fig. 1 and 2, the first mechanical interlock 1 includes a first main shaft driven element 1-2, a first link 1-1 and a first brake release driving element 1-3, and the first link 1-1 is connected between the first main shaft driven element 1-2 and the first brake release driving element 1-3.
The second mechanical interlock 2 comprises a second main shaft driven part 2-2, a second connecting rod 2-1 and a second shunt tripping driving part 2-3, and the second connecting rod 2-1 is connected between the second main shaft driven part 2-2 and the second shunt tripping driving part 2-3.
As shown in fig. 5 and 6, the third mechanical interlock 3 includes a third main shaft driven element 3-2, a third link 3-1 and a third brake release driving element 3-3, and the third link 3-1 is connected between the third main shaft driven element 3-2 and the third brake release driving element 3-3.
The fourth mechanical interlock 4 comprises a fourth main shaft driven part 4-2, a fourth connecting rod 4-1 and a fourth brake tripping driving part 4-3, and the fourth connecting rod 4-1 is connected between the fourth main shaft driven part 4-2 and the fourth brake tripping driving part 4-3.
Fig. 3 shows a bypass switch 5 according to the present disclosure, provided with:
the bypass switch common power supply switch main shaft 5-1 is used for driving a common power supply to switch on or switch off;
the bypass switch standby power supply switch main shaft 5-2 is used for driving the standby power supply to be switched on or switched off;
the bypass switch common power supply tripping rod 5-3 is used for being driven to trip and trip the common power supply switch; and
and a bypass switch standby power supply opening tripping rod 5-4 which is used for being driven to trip and open the standby power supply switch.
Fig. 4 shows a dual power transfer switch 6 according to the present disclosure, which is provided with:
the dual-power transfer switch common power switch main shaft 6-1 is used for driving a common power supply to switch on or switch off;
the main shaft 6-2 of the standby power supply switch of the dual-power transfer switch is used for driving the standby power supply to be switched on or switched off;
the dual-power transfer switch common power supply tripping bar 6-3 is used for being driven to trip and trip the common power supply switch; and
and the dual-power transfer switch standby power supply tripping and tripping rod 6-4 is used for being driven to trip and trip the standby power supply switch.
The first mechanical interlock 1 and the second mechanical interlock 2 are operably connected on one side of the bypass switch 5 and the dual power transfer switch 6.
The third mechanical interlock 3 and the fourth mechanical interlock 4 are operably connected on the other side of the bypass switch 5 and the dual power transfer switch 6.
The mechanical interlock and the bypass switch 5 have the following mating relationship:
the bypass switch standby power supply opening tripping rod 5-4 is matched with the inclined plane of the fourth opening tripping driving piece 4-3;
the main shaft 5-2 of the bypass switch standby power switch is matched with an opening of the third main shaft driven part 3-2;
the common power supply tripping rod 5-3 of the bypass switch is matched with the inclined plane of the second tripping driving piece 2-3;
the bypass switch is normally fitted with the opening of the first spindle driven part 1-2 using the mains switch spindle 5-1.
As shown in fig. 1, 2, 5 and 6, the first to fourth mechanical interlocks are floatingly mounted to a side plate (not shown) of the drawer frame and are fixed at an initial position by a fixing pin (not shown) and a return spring (not shown).
When dual power transfer switch 6 is swung into the mounting rack (as shown in fig. 1, dual power transfer switch 6 will move from right to left along guide rail 7), the mechanical interlock has the following mating relationship with dual power transfer switch 6:
the standby power supply brake-separating tripping rod 6-4 of the double-power-supply transfer switch automatically enters the inclined plane of the first brake-separating tripping driving piece 1-3;
a main shaft 6-2 of a standby power switch of the dual-power transfer switch automatically enters an opening of a driven part 2-2 of a second main shaft;
the common power supply opening tripping rod 6-3 of the dual-power transfer switch automatically enters the inclined plane of the third opening tripping driving piece 3-3;
the dual-power transfer switch common power switch main shaft 6-1 automatically enters the opening of the fourth main shaft driven part 4-2.
The mechanical interlock is now realized with the bypass switch 5 and the dual power transfer switch 6.
When the dual-power transfer switch is shaken out of the drawing frame (as shown in figure 1, moving from left to right), the switch main shaft and the brake separating tripping rod are separated from the corresponding opening and the inclined plane, and the dual-power transfer switch can be separated because of no mechanical connection with the drawing frame so as to carry out remote maintenance.
The manner in which the interlock function operates according to the present disclosure is described below in conjunction with fig. 1 through 6.
Due to maintenance requirements, sometimes the dual-power transfer switch 6 is required to be disconnected and shaken out of the installation drawer frame, at the moment, the bypass switch 5 must be turned on firstly to disconnect the dual-power transfer switch 6 due to the requirement of the load on power supply continuity, and therefore an operator must turn on the bypass switch 5 firstly before shaking out the dual-power transfer switch 6.
When the dual power transfer switch 6 is swung out of the mounting rack, as shown in fig. 1, the dual power transfer switch 6 will move from left to right along the guide rail 7.
Specifically, if the dual power transfer switch 6 is powered by a standby power supply before, the second mechanical interlock 2 causes the closing operation of the bypass switch common power switch to be invalid, at this time, the second main shaft is driven by the driving part 2-2 of the dual power transfer switch standby power switch main shaft 6-2 to rotate to the closing position, and the second disconnecting link tripping driving part 2-3 is driven by the second connecting rod 2-1 to rotate to the tripping position, at this time, the closing operation of the common power supply connected with the bypass switch 5 is invalid, and the standby power supply connected with the bypass switch 5 can be closed because the bypass switch standby power supply disconnecting link 5-4 is not controlled by any mechanical interlock.
If the dual-power transfer switch 6 is powered by a common power supply before, the fourth mechanical interlock 4 causes the closing operation of the bypass switch standby power supply switch to be invalid, at the moment, the fourth main shaft is driven by the driving piece 4-2 to rotate to the closing position under the driving of the dual-power transfer switch common power supply switch main shaft 6-1, the fourth connecting rod 4-1 drives the fourth brake tripping driving piece 4-3 to rotate to the tripping position, at the moment, the closing operation of the standby power supply connected with the bypass switch 5 is invalid, and the common power supply connected with the bypass switch 5 can be closed because the bypass switch common power supply tripping rod 5-3 is not controlled by any mechanical interlock.
When the dual power transfer switch completes maintenance and is swung into the mounting rack, as shown in fig. 1, the dual power transfer switch 6 will move from right to left along the guide rail 7.
If the bypass switch 5 is powered by a standby power supply before, the third mechanical interlock 3 causes the closing operation of the common power supply switch of the dual-power transfer switch to be invalid, at the moment, the third main shaft is driven by the driving part 3-2 to rotate to the closing position under the driving of the main shaft 5-2 of the standby power supply switch of the bypass switch, and the third tripping driving part 3-3 is driven by the third connecting rod 3-1 to rotate to the tripping position, at the moment, the closing operation of the common power supply connected with the dual-power transfer switch 6 is invalid, and the standby power supply connected with the dual-power transfer switch 6 can be closed because the tripping rod 6-4 of the standby power supply of the dual-power transfer switch is not controlled by any mechanical interlock.
If the bypass switch 5 is powered by a common power supply before, the first mechanical interlock 1 causes the closing operation of the standby power supply switch of the dual-power supply changeover switch to be invalid, at the moment, the first main shaft is driven by the driving part 1-2 to rotate to the closing position under the driving of the main shaft 5-1 of the common power supply switch of the bypass switch, and the first tripping driving part 1-2 is driven by the first connecting rod 1-1 to rotate to the tripping position, at the moment, the closing operation of the standby power supply connected with the dual-power supply changeover switch 6 is invalid, and the common power supply connected with the dual-power supply changeover switch 6 can be closed because the tripping rod 6-3 of the common power supply switch of the dual-power supply changeover switch is not controlled by any.
While the invention has been described in the specification and drawings with reference to specific embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention as defined in the claims. Moreover, the combination and arrangement of features, elements and/or functions between specific embodiments herein is clearly apparent and thus, in light of this disclosure, one skilled in the art will appreciate that features, elements and/or functions of an embodiment may be incorporated into another specific embodiment as appropriate, unless described otherwise, above. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment illustrated by the drawings and described in the specification as the best mode presently contemplated for carrying out this invention, but that the invention will include all embodiments falling within the scope of the foregoing description and the appended claims.
Claims (8)
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| CN201610237209.9A CN107301928B (en) | 2016-04-15 | 2016-04-15 | A Mechanical Interlock for Bypass Type Dual Power Transfer Switch |
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| CN201610237209.9A CN107301928B (en) | 2016-04-15 | 2016-04-15 | A Mechanical Interlock for Bypass Type Dual Power Transfer Switch |
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| CN107301928B true CN107301928B (en) | 2020-05-29 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108807041B (en) * | 2018-06-26 | 2025-02-18 | 上海良信电器股份有限公司 | A mechanical interlocking device for a dual power automatic transfer switch |
| CN109712833B (en) * | 2019-03-12 | 2024-08-23 | 盎迈智能科技（上海）有限公司 | Rigid interlocking type full duplex bypass type change-over switch system |
| CN110379657B (en) * | 2019-07-16 | 2021-09-03 | 德布森电气（上海）有限公司 | Drawable double-bypass automatic change-over switch |
| CN110416007A (en) * | 2019-08-19 | 2019-11-05 | 无锡韩光电器股份有限公司 | For bypassing the mechanical lock buckle device of automatic transfer switching electric appliance |
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| US5023469A (en) * | 1990-02-05 | 1991-06-11 | Zenith Controls, Inc. | Interlock system for bypass/isolation automatic transfer switch |
| DE19752148A1 (en) * | 1997-11-25 | 1999-05-27 | Kloeckner Moeller Gmbh | Power circuit breaker switch |
| CN102509661A (en) * | 2011-10-28 | 2012-06-20 | 贵州长征开关制造有限公司 | Operation linkage safety interlocking linkage device of electrical appliance with draw-out switchgear |
| CN205159152U (en) * | 2015-11-30 | 2016-04-13 | 施耐德电气工业公司 | Dual -power automatic transfer switch |
| CN205723225U (en) * | 2016-04-15 | 2016-11-23 | 施耐德电器工业公司 | A kind of mechanical interlocking for bypass type dual-power transfer switch |
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| CN107301928A (en) | 2017-10-27 |
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