A low voltage phase-changing switch

Abstract

The present invention provides a low-voltage phase-changing switch, comprising a housing and an A-phase input terminal, a B-phase input terminal, a C-phase input terminal and three output terminals arranged on the housing, and also comprising a conversion switch, a linkage rod and a contact, wherein the linkage rod is movably connected to the conversion switch, and the contact comprises a static contact and a moving contact. The present invention provides a low-voltage phase-changing switch, wherein after the phase-changing operation, the original A-phase load is adjusted to the C-phase power supply, the original B-phase load is adjusted to the A-phase power supply, and the original C-phase load is adjusted to the B-phase power supply. When there are multiple outputs on the low-voltage side of the distribution transformer, the three-phase load is dynamically adjusted by the low-voltage phase-changing switch to achieve the three-phase imbalance adjustment on the low-voltage side of the distribution transformer, and the adjustment method does not change the phase sequence of the three-phase equipment, the three-phase equipment can still work normally, and the single-phase equipment can adjust the phase without changing the line connection, thereby achieving the purpose of fast and flexible adjustment, improving work efficiency, and reducing the workload of the staff.

Description

Technical Field

[0001] The present invention relates to the field of low-voltage electrical equipment, and more specifically, to a low-voltage phase-changing switch. Background Art

[0002] The three-phase load imbalance on the low-voltage side of the distribution transformer currently used for residential power supply is common. The reason for the imbalance of the three-phase load on the low-voltage side of the distribution transformer is that the residential load is generally single-phase load, and the three-phase load is unbalanced due to uneven distribution of single-phase load or differences in the synchronization of single-phase load power consumption. The unbalanced three-phase load of the distribution transformer will increase the loss of the low-voltage line, the output power of the transformer cannot be fully utilized, the neutral point drift phase voltage on the low-voltage side is asymmetric, and the risk of neutral line cable and fault burning is increased.

[0003] The current measures for dealing with unbalanced three-phase load on the low-voltage side of the transformer are: 1. Adjust the single-phase load of the corresponding low-voltage line, and adjust the single-phase users on the phase line with heavier load to the phase line with lighter load, but this method has a large workload and needs to be adjusted for each single-phase user. 2. The adjustment result of single-phase load is not ideal and accurate due to the different electricity consumption time of users. 3. For three-phase four-wire load users, the three-phase balance is determined by the internal load of the user, and the adjustment work cannot be implemented. 4. The method of adjusting the load of single-phase users is adopted to improve the imbalance of three-phase load. After the adjustment, if the load changes or seasonal changes, the imbalance will reappear, and it often needs to be adjusted again, which is labor-intensive and inefficient. Summary of the invention

[0004] The present invention provides a low-voltage phase-changing switch to solve the problems of heavy workload and low work efficiency of workers in adjusting three-phase loads.

[0005] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0006] A low-voltage phase-changing switch comprises a housing and an A-phase input terminal, a B-phase input terminal, a C-phase input terminal and three output terminals arranged on the housing, a transfer switch, a linkage rod and a contact, wherein the linkage rod is movably connected to the transfer switch, and the contact comprises a stationary contact and a moving contact; wherein:

[0007] There are six static contacts, namely the first static contact, the second static contact, the third static contact, the fourth static contact, the fifth static contact and the sixth static contact; the first static contact is electrically connected to the A-phase input terminal, the second static contact is electrically connected to the B-phase input terminal, the third static contact is electrically connected to the C-phase input terminal, the fourth static contact is electrically connected to the C-phase input terminal, the fifth static contact is electrically connected to the A-phase input terminal, and the sixth static contact is electrically connected to the B-phase input terminal;

[0008] There are three moving contacts, namely a first moving contact, a second moving contact and a third moving contact; the first moving contact, the second moving contact and the third moving contact are electrically connected to the three output terminals of the low-voltage phase-changing switch respectively;

[0009] The static contact is fixed in the housing, and the moving contact is fixed on the linkage rod; the first moving contact is adjacent to the first static contact and the fourth static contact respectively, the second moving contact is adjacent to the second static contact and the fifth static contact respectively, and the third moving contact is adjacent to the third static contact and the sixth static contact respectively; when the first moving contact is closed with the first static contact, the second moving contact and the second static contact, and the third moving contact and the third static contact are all closed; when the linkage rod moves laterally to close the first moving contact and the fourth static contact, the second moving contact and the fifth static contact, and the third moving contact and the sixth static contact are all closed.

[0010] In the above scheme, during normal operation, the first moving contact, the second moving contact and the third moving contact are connected to the first static contact, the second static contact and the third static contact respectively, and the output end is connected to the cable or wire to supply power to the load, and the phases are ABC in sequence, and the phase sequence is positive sequence; during phase switching operation, the first moving contact, the second moving contact and the third moving contact are connected to the fourth static contact, the fifth static contact and the sixth static contact respectively, and the output end is connected to the cable or wire to supply power to the load, and the phases are CAB in sequence, and the phase sequence is positive sequence. The staff moves the linkage rod through the conversion switch, so that the moving contact on the linkage rod is closed with different static contacts to achieve phase switching. After the phase change, the original A-phase load is adjusted to C-phase power supply, the original B-phase load is adjusted to A-phase power supply, and the original C-phase load is adjusted to B-phase power supply. When there are multiple outputs on the low-voltage side of the distribution transformer, as long as the low-voltage outlet switch is equipped with a phase change switch, the three-phase load can be dynamically adjusted by simply calculating the load of each low-voltage outlet line, thereby realizing the three-phase imbalance adjustment on the low-voltage side of the distribution transformer. Moreover, this adjustment method does not change the phase sequence of the three-phase equipment, and the three-phase equipment can still work normally. The single-phase equipment can adjust the phase without changing the line wiring, thus achieving the purpose of fast and flexible adjustment, improving work efficiency, and reducing the workload of staff.

[0011] Preferably, a displacement gear is provided on one side of the linkage rod, and a gear is provided on the outer periphery of the conversion switch; the displacement gear is engaged with the gear, and when the conversion switch is rotated, the gear on the outer side of the conversion switch drives the displacement gear on the linkage rod to make the linkage rod move laterally.

[0012] In the above scheme, when the transfer switch rotates, the gear on the outer side of the transfer switch drives the displacement gear on the linkage rod to move the linkage rod laterally, thereby moving the moving contact to the corresponding position to achieve the phase change function.

[0013] Preferably, the linkage rod adopts an insulating structure.

[0014] In the above scheme, the insulating linkage rod avoids short circuit and enables each moving contact to work independently.

[0015] Preferably, the input ends of the low-voltage phase-changing switches are each provided with power side terminals, and the first static contact, the second static contact and the third static contact are electrically connected to one end of the power side terminals of the A-phase input end, the B-phase input end and the C-phase input end, respectively, and the other end of the power side terminals is electrically connected to the output end of the low-voltage air circuit breaker.

[0016] In the above scheme, the power supply side terminal is connected to the output terminal of the low-voltage air circuit breaker, and the load current passes through it.

[0017] Preferably, the three output ends of the low-voltage phase-changing switch are all provided with load-side terminals, the first moving contact, the second moving contact and the third moving contact are electrically connected to one end of the load-side terminal respectively, and the other end of the load-side terminal is electrically connected to the load.

[0018] In the above scheme, the load-side wiring terminals are directly connected to the load, and the phase set by the low-voltage phase-changing switch is output.

[0019] Preferably, the conversion switch is provided with three gears, namely normal, disconnection and phase change;

[0020] When working in the normal gear position, the first moving contact and the first static contact, the second moving contact and the second static contact, and the third moving contact and the third static contact are all closed;

[0021] When working in the disconnecting position, the moving contact and the static contact are not closed;

[0022] When working in the phase-changing gear position, the first moving contact and the fourth stationary contact, the second moving contact and the fifth stationary contact, and the third moving contact and the sixth stationary contact are all closed.

[0023] In the above scheme, the staff can select different gears for phase-changing adjustment according to the actual situation; at the same time, the staff can also clearly understand the working status of the low-voltage phase-changing switch according to the gear mark.

[0024] Preferably, the transfer switch is provided with a transfer switch positioning mechanism, and the transfer switch positioning mechanism is used for shift positioning.

[0025] In the above scheme, the shifting function of the conversion switch is realized by the conversion switch positioning mechanism.

[0026] Preferably, the conversion switch positioning mechanism includes a housing, a compression spring, a travel conversion wheel, a positioning plate and a switch dial; wherein, one end of the compression spring is fixed to the inner wall of the housing, and the other end of the compression spring is movably connected to the travel conversion wheel via a telescopic rod; the positioning plate is provided with a plurality of positioning grooves, and the positioning grooves are used to clamp the travel conversion wheel; the switch dial is fixedly connected to the positioning plate.

[0027] In the above scheme, the conversion switch positioning mechanism mainly pushes the telescopic rod through the compression spring, so that the travel conversion wheel stops in the corresponding groove of the positioning plate, and cooperates with the travel of the moving contact to achieve three-speed rapid switching and positioning of the low-voltage phase-changing switch.

[0028] Preferably, there are three positioning grooves, namely a normal positioning groove, a disconnection positioning groove and a phase-changing positioning groove.

[0029] In the above scheme, the normal positioning groove, the disconnection positioning groove and the phase-changing positioning groove correspond to the normal gear position, the disconnection gear position and the phase-changing gear position of the conversion switch respectively.

[0030] Preferably, a travel limiter is also provided on the positioning piece.

[0031] In the above solution, the travel limiter limits the deflection of the positioning piece, thereby improving the stability and reliability of the positioning mechanism of the transfer switch.

[0032] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0033] The present invention provides a low-voltage phase-changing switch. When working normally, the first moving contact, the second moving contact and the third moving contact are connected to the first static contact, the second static contact and the third static contact respectively, the output end is connected to a cable or a wire, the load is powered, and the phases are ABC in sequence, and the phase sequence is positive sequence; when working in phase-changing mode, the first moving contact, the second moving contact and the third moving contact are connected to the fourth static contact, the fifth static contact and the sixth static contact respectively, the output end is connected to a cable or a wire, the load is powered, and the phases are CAB in sequence, and the phase sequence is positive sequence. The staff moves the linkage rod through the conversion switch, so that the moving contact on the linkage rod is closed with different static contacts to realize phase-changing. After the phase change, the original A-phase load is adjusted to C-phase power supply, the original B-phase load is adjusted to A-phase power supply, and the original C-phase load is adjusted to B-phase power supply. When there are multiple outputs on the low-voltage side of the distribution transformer, as long as the low-voltage outlet switch is equipped with a phase change switch, the three-phase load can be dynamically adjusted by simply calculating the load of each low-voltage outlet line, thereby realizing the three-phase imbalance adjustment on the low-voltage side of the distribution transformer. Moreover, this adjustment method does not change the phase sequence of the three-phase equipment, and the three-phase equipment can still work normally. The single-phase equipment can adjust the phase without changing the line wiring, thus achieving the purpose of fast and flexible adjustment, improving work efficiency, and reducing the workload of staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0035] Figure 2 It is a schematic diagram of the circuit principle of the present invention;

[0036] Figure 3 This is a schematic diagram of an application of an embodiment of the present invention;

[0037] Figure 4 It is a structural schematic diagram of the positioning mechanism of the transfer switch of the present invention;

[0038] Among them: 1. Shell; 2. Transfer switch; 21. Gear; 3. Linkage rod; 31. Displacement gear; 4. Contact; 41. Static contact; 411. First static contact; 412. Second static contact; 413. Third static contact; 414. Fourth static contact; 415. Fifth static contact; 416. Sixth static contact; 42. Moving contact; 421. First moving contact; 422. Second moving contact; 423. Third moving contact; 5. Power side terminal; 6. Load side terminal; 7. Transfer switch positioner; 71. Shell; 72. Compression spring; 73. Travel conversion wheel; 74. Positioning piece; 75. Switch turntable; 76. Positioning slot; 761. Normal positioning slot; 762. Disconnection positioning slot; 763. Phase change positioning slot; 77. Travel limiter. DETAILED DESCRIPTION

[0039] The drawings are for illustrative purposes only and should not be construed as limiting the present patent;

[0040] In order to better illustrate the present embodiment, some parts in the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product;

[0041] It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0042] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0043] like Figure 1-2 As shown, a low-voltage phase-changing switch comprises a housing 1 and an A-phase input terminal, a B-phase input terminal, a C-phase input terminal and three output terminals arranged on the housing 1, and also comprises a transfer switch 2, a linkage rod 3 and a contact 4, wherein the linkage rod 3 is movably connected to the transfer switch 2, and the contact 4 comprises a stationary contact 41 and a moving contact 42; wherein,

[0044] There are six static contacts 41, namely a first static contact 411, a second static contact 412, a third static contact 413, a fourth static contact 414, a fifth static contact 415 and a sixth static contact 416; the first static contact 411 is electrically connected to the A-phase input terminal, the second static contact 412 is electrically connected to the B-phase input terminal, the third static contact 413 is electrically connected to the C-phase input terminal, the fourth static contact 414 is electrically connected to the C-phase input terminal, the fifth static contact 415 is electrically connected to the A-phase input terminal, and the sixth static contact 416 is electrically connected to the B-phase input terminal;

[0045] The movable contacts 42 have three parts, namely a first movable contact 421, a second movable contact 422 and a third movable contact 423; the first movable contact 421, the second movable contact 422 and the third movable contact 423 are electrically connected to the three output terminals of the low-voltage phase-changing switch respectively;

[0046] The static contact 41 is fixedly arranged in the housing 1, and the moving contact 42 is fixedly arranged on the linkage rod 3; the first moving contact 421 is adjacent to the first static contact 411 and the fourth static contact 414 respectively, the second moving contact 422 is adjacent to the second static contact 412 and the fifth static contact 415 respectively, and the third moving contact 423 is adjacent to the third static contact 413 and the sixth static contact 416 respectively; when the first moving contact 421 is closed with the first static contact 411, the second moving contact 422 and the second static contact 412, and the third moving contact 423 and the third static contact 413 are all closed; when the linkage rod 3 moves laterally to close the first moving contact 421 and the fourth static contact 414, the second moving contact 422 and the fifth static contact 415, and the third moving contact 423 and the sixth static contact 416 are all closed.

[0047] During the implementation process, in normal operation, the first moving contact 421, the second moving contact 422 and the third moving contact 423 are connected to the first static contact 411, the second static contact 412 and the third static contact 413 respectively, and the output end is connected to the cable or wire to supply power to the load, and the phases are ABC in sequence, and the phase sequence is positive sequence; in phase switching operation, the first moving contact 421, the second moving contact 422 and the third moving contact 423 are connected to the fourth static contact 414, the fifth static contact 415 and the sixth static contact 416 respectively, and the output end is connected to the cable or wire to supply power to the load, and the phases are CAB in sequence, and the phase sequence is positive sequence. The staff moves the linkage rod 3 through the conversion switch 2, so that the moving contact 42 on the linkage rod 3 is closed with different static contacts 41 to achieve phase switching. After the phase change, the original A-phase load is adjusted to C-phase power supply, the original B-phase load is adjusted to A-phase power supply, and the original C-phase load is adjusted to B-phase power supply. When there are multiple outputs on the low-voltage side of the distribution transformer, as long as the low-voltage outlet switch is equipped with a phase change switch, the three-phase load can be dynamically adjusted by simply calculating the load of each low-voltage outlet line, thereby realizing the three-phase imbalance adjustment on the low-voltage side of the distribution transformer. Moreover, this adjustment method does not change the phase sequence of the three-phase equipment, and the three-phase equipment can still work normally. The single-phase equipment can adjust the phase without changing the line wiring, thus achieving the purpose of fast and flexible adjustment, improving work efficiency, and reducing the workload of staff.

[0048] More specifically, a displacement gear 31 is provided on one side of the linkage rod 3, and a gear is provided on the outer periphery of the conversion switch 2; the displacement gear 31 is engaged with the gear, and when the conversion switch 2 rotates, the gear on the outer side of the conversion switch 2 drives the displacement gear 31 on the linkage rod 3 to make the linkage rod 3 move laterally.

[0049] During implementation, when the transfer switch 2 rotates, the gear on the outer side of the transfer switch 2 drives the displacement gear 31 on the linkage rod 3 to move the linkage rod 3 laterally, thereby moving the moving contact 42 to a corresponding position to achieve the phase switching function.

[0050] More specifically, the linkage rod 3 adopts an insulating structure.

[0051] During the implementation process, the insulating linkage rod 3 avoids short circuit, so that each moving contact 42 can work independently.

[0052] More specifically, Figure 3 As shown, the input ends of the low-voltage phase-changing switches are each provided with power-side wiring terminals 5, the first static contact 411, the second static contact 412 and the third static contact 413 are electrically connected to one end of the power-side wiring terminals 5 of the A-phase input end, the B-phase input end and the C-phase input end, respectively, and the other end of the power-side wiring terminal 5 is electrically connected to the output end of the low-voltage air circuit breaker.

[0053] During the implementation process, the power supply side terminal 5 is connected to the output terminal of the low voltage air circuit breaker to pass the load current.

[0054] More specifically, the three output ends of the low-voltage phase-changing switch are each provided with a load-side terminal 6, the first moving contact 421, the second moving contact 422 and the third moving contact 423 are respectively electrically connected to one end of the load-side terminal 6, and the other end of the load-side terminal 6 is electrically connected to the load.

[0055] During the implementation process, the load-side terminal 6 is directly connected to the load to output the phase set by the low-voltage phase-changing switch.

[0056] More specifically, the conversion switch 2 is provided with three gears, namely normal, disconnection and phase change;

[0057] When working in the normal gear, the first moving contact 421 and the first static contact 411, the second moving contact 422 and the second static contact 412, and the third moving contact 423 and the third static contact 413 are all closed;

[0058] When working in the disconnecting position, the moving contact 42 and the static contact 41 are not closed;

[0059] When working in the phase-changing gear position, the first moving contact 421 and the fourth stationary contact 414, the second moving contact 422 and the fifth stationary contact 415, and the third moving contact 423 and the sixth stationary contact 416 are all closed.

[0060] During the implementation process, the staff can select different gears for phase-changing adjustments according to the actual situation; at the same time, the staff can also clearly understand the working status of the low-voltage phase-changing switch according to the gear mark.

[0061] More specifically, Figure 4 As shown, the transfer switch 2 is provided with a transfer switch positioning mechanism 7, and the transfer switch positioning mechanism 7 is used for shift positioning.

[0062] During the implementation process, the shifting function of the transfer switch is realized by the transfer switch positioning mechanism 7 .

[0063] More specifically, the conversion switch positioning mechanism 7 includes a shell 71, a compression spring 72, a stroke conversion wheel 73, a positioning plate 74 and a switch dial 75; wherein, one end of the compression spring 72 is fixed to the inner wall of the shell 71, and the other end of the compression spring 72 is movably connected to the stroke conversion wheel 73 through a telescopic rod; the positioning plate 74 is provided with a plurality of positioning grooves 76, and the positioning grooves 76 are used to clamp the stroke conversion wheel 73; the switch dial 75 is fixedly connected to the positioning plate 74.

[0064] During the implementation process, the conversion switch positioning mechanism 7 mainly pushes the telescopic rod through the compression spring 72, so that the travel conversion wheel 73 stops in the corresponding groove of the positioning piece 74, and cooperates with the travel of the moving contact 42 to achieve three-speed rapid switching and positioning of the low-voltage phase-changing switch.

[0065] More specifically, there are three positioning grooves 76 , namely a normal positioning groove 761 , a disconnection positioning groove 762 and a switching positioning groove 763 .

[0066] During implementation, the normal positioning groove 761, the disconnection positioning groove 762 and the phase-changing positioning groove 763 correspond to the normal gear position, the disconnection gear position and the phase-changing gear position of the transfer switch respectively.

[0067] More specifically, a travel limiter 77 is also disposed on the positioning piece 74 .

[0068] During the implementation process, the travel limiter 77 limits the deflection of the positioning piece 74, thereby improving the stability and reliability of the transfer switch positioning mechanism 7.

[0069] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A low-voltage phase-changing switch, comprising a housing (1) and an A-phase input terminal, a B-phase input terminal, a C-phase input terminal and three output terminals arranged on the housing (1), characterized in that: It also includes a conversion switch (2), a linkage rod (3) and a contact (4), wherein the linkage rod (3) is movably connected to the conversion switch (2), and the contact (4) includes a stationary contact (41) and a moving contact (42); wherein: There are six stationary contacts (41), namely a first stationary contact (411), a second stationary contact (412), a third stationary contact (413), a fourth stationary contact (414), a fifth stationary contact (415) and a sixth stationary contact (416); the first stationary contact (411) is electrically connected to the A-phase input terminal, the second stationary contact (412) is electrically connected to the B-phase input terminal, the third stationary contact (413) is electrically connected to the C-phase input terminal, the fourth stationary contact (414) is electrically connected to the C-phase input terminal, the fifth stationary contact (415) is electrically connected to the A-phase input terminal, and the sixth stationary contact (416) is electrically connected to the B-phase input terminal; There are three moving contacts (42), namely a first moving contact (421), a second moving contact (422) and a third moving contact (423); the first moving contact (421), the second moving contact (422) and the third moving contact (423) are electrically connected to three output terminals of the low-voltage phase-changing switch, respectively; The stationary contact (41) is fixedly arranged in the housing (1), and the moving contact (42) is fixedly arranged on the linkage rod (3); the first moving contact (421) is adjacent to the first stationary contact (411) and the fourth stationary contact (414), respectively, the second moving contact (422) is adjacent to the second stationary contact (412) and the fifth stationary contact (415), respectively, and the third moving contact (423) is adjacent to the third stationary contact (413) and the sixth stationary contact (416), respectively; when the first moving contact (421) is adjacent to the first stationary contact (411) and the fourth stationary contact (414), respectively, the second moving contact (422) is adjacent to the second stationary contact (412) and the fifth stationary contact (415), respectively. When the contact (421) is closed with the first static contact (411), the second moving contact (422) is closed with the second static contact (412), and the third moving contact (423) is closed with the third static contact (413); when the linkage rod (3) moves laterally to close the first moving contact (421) and the fourth static contact (414), the second moving contact (422) is closed with the fifth static contact (415), and the third moving contact (423) is closed with the sixth static contact (416); A displacement gear (31) is provided on one side of the linkage rod (3), and a gear (21) is provided on the outer periphery of the conversion switch (2); the displacement gear (31) meshes with the gear (21), and when the conversion switch (2) rotates, the gear (21) on the outer side of the conversion switch (2) drives the displacement gear (31) on the linkage rod (3), so that the linkage rod (3) moves laterally; The conversion switch (2) is provided with three gears, namely normal, disconnection and phase change; When operating in the normal gear position, the first moving contact (421) and the first static contact (411), the second moving contact (422) and the second static contact (412), and the third moving contact (423) and the third static contact (413) are all closed; When operating in the disconnecting position, the moving contact (42) and the stationary contact (41) are not closed; When operating in the phase-changing gear position, the first moving contact (421) and the fourth stationary contact (414), the second moving contact (422) and the fifth stationary contact (415), and the third moving contact (423) and the sixth stationary contact (416) are all closed.

2. A low voltage phase-changing switch according to claim 1, characterized in that: The linkage rod (3) adopts an insulating structure.

3. A low voltage phase-changing switch according to claim 1, characterized in that: The input ends of the low-voltage phase-changing switches are each provided with a power-side wiring terminal (5); the first static contact (411), the second static contact (412) and the third static contact (413) are respectively electrically connected to one end of the power-side wiring terminal (5) of the A-phase input end, the B-phase input end and the C-phase input end; and the other end of the power-side wiring terminal (5) is electrically connected to the output end of the low-voltage air circuit breaker.

4. A low voltage phase-changing switch according to claim 1, characterized in that: The three output ends of the low-voltage phase-changing switch are all provided with a load-side wiring terminal (6); the first moving contact (421), the second moving contact (422) and the third moving contact (423) are respectively electrically connected to one end of the load-side wiring terminal (6); and the other end of the load-side wiring terminal (6) is electrically connected to the load.

5. A low voltage phase-changing switch according to claim 1, characterized in that: The conversion switch (2) is provided with a conversion switch positioning mechanism (7), and the conversion switch positioning mechanism (7) is used for shift positioning.

6. A low voltage phase-changing switch according to claim 5, characterized in that: The conversion switch positioning mechanism (7) comprises a housing (71), a compression spring (72), a stroke conversion wheel (73), a positioning piece (74) and a switch rotating disk (75); wherein one end of the compression spring (72) is fixed to the inner wall of the housing (71), and the other end of the compression spring (72) is movably connected to the stroke conversion wheel (73) via a telescopic rod; the positioning piece (74) is provided with a plurality of positioning grooves (76), and the positioning grooves (76) are used to clamp the stroke conversion wheel (73); and the switch rotating disk (75) is fixedly connected to the positioning piece (74).

7. A low voltage phase-changing switch according to claim 6, characterized in that: There are three positioning grooves (76), namely a normal positioning groove (761), a disconnection positioning groove (762) and a phase-changing positioning groove (763).

8. A low voltage phase-changing switch according to claim 6, characterized in that: The positioning piece (74) is also provided with a travel limiter (77).

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