Load switch and ammeter

Abstract

The utility model relates to the technical field of electrical equipment, in particular to a load switch and an electricity meter. The load switch comprises a contact system, the contact system comprises a busbar, a moving contact, a static contact and a clamping structure, one end of the moving contact is rotatably connected to the busbar, and the other end of the moving contact can be in contact with or separated from the static contact; the clamping structure is used for providing clamping force enabling the busbar and the moving contact to be tightly attached. The load switch provided by the utility model has the following advantages: the problem of flexible connection disconnection is avoided, and the circuit is more stable and reliable; the moving contact is not subjected to resistance caused by flexible connection in the rotating process, so that the rotating of the moving contact is more flexible; the contact system is convenient to disassemble and assemble and small in occupied space; under the clamping force provided by the clamping structure, the busbar and the moving contact can be tightly attached, so that the reliability of connection between the busbar and the moving contact is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical equipment, in particular to a load switch and an electric meter. Background Art

[0002] Load switches control the on / off switching of loads in circuits, ensuring safe operation of electrical appliances. They are widely used in household appliances, remote control, telemetry, communications, automatic control, mechatronics, and power electronics, serving as a key control component. The contact system within a load switch is a key component in controlling the on / off switching of circuits. The contact system comprises a busbar, a moving contact, and a stationary contact. During operation, the moving contact rotates to make contact or separate from the stationary contact, switching the circuit on and off.

[0003] Existing load switches usually use flexible connections (such as copper wires) to connect the moving contact and the busbar. This structure has the following defects: when the moving contact rotates, the flexible connection will cause it to bend. After repeated rotation of the moving contact, the flexible connection may be broken, resulting in circuit instability; space for the flexible connection to bend and move needs to be reserved inside the load switch, which increases the size of the load switch; the flexible connection needs to be screwed or welded between the moving contact and the busbar, which is inconvenient to disassemble and assemble, and the interface is easy to disconnect. Utility Model Content

[0004] The first purpose of the utility model is to provide a load switch to solve the technical problems of existing load switches, such as the soft connection is easily disconnected and the interfaces at both ends of the soft connection are easily disconnected, resulting in circuit instability, and the soft connection is inconvenient to disassemble and assemble and occupies a large space.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A load switch includes a contact system, which includes a busbar, a moving contact, a static contact and a clamping structure, wherein: one end of the moving contact is rotatably connected to the busbar, and the other end of the moving contact can contact or separate from the static contact; the clamping structure is used to provide a clamping force that makes the busbar and the moving contact fit tightly.

[0007] Furthermore, the clamping structure includes a first clamping structure, the first clamping structure includes two first extrusion parts arranged opposite to each other, and the busbar and the moving contact are clamped between the two first extrusion parts.

[0008] Furthermore, the first clamping structure further includes a connecting portion, wherein one of the first extrusion portions, the connecting portion, and another of the first extrusion portions are sequentially connected to form a U-shaped sheet structure.

[0009] Furthermore, the contact system further comprises a contact bracket, the contact bracket comprising a supporting base plate and two supporting side plates respectively connected to opposite sides of the supporting base plate, the moving contact being mounted on the contact bracket and located between the two supporting side plates;

[0010] The supporting base plate is provided with a limiting block which is engaged with the connecting portion.

[0011] Furthermore, each of the first extrusion portions includes two first pressing sheets, and the two first pressing sheets are respectively located on opposite sides of the rotation axis of the moving contact;

[0012] Each of the first pressing sheets is provided with a first protrusion protruding toward the moving contact.

[0013] Furthermore, the clamping structure further includes a second clamping structure mounted on the busbar, the second clamping structure includes two oppositely arranged second extrusion portions, and the busbar and the moving contact are clamped between the two second extrusion portions.

[0014] Furthermore, the second clamping structure further includes two mounting portions, the two mounting portions are connected to the two second extrusion portions in a one-to-one correspondence, and the two mounting portions are respectively connected to opposite sides of the busbar.

[0015] Furthermore, the busbar is in an L-shaped structure, comprising an external circuit portion and a contact connection portion, wherein the external circuit portion, the contact connection portion and the movable contact are sequentially connected to form a U-shaped conductive path;

[0016] The external circuit portion is located on a side of the moving contact facing away from the moving contact point.

[0017] Furthermore, the moving contact includes two moving contact pieces arranged side by side and at an interval, and the contact connecting portion of the busbar is inserted between the two moving contact pieces.

[0018] The second object of the present utility model is to provide an electric meter, comprising a mutual inductor and a load switch as described in any one of the above items;

[0019] The load switch further comprises a housing and an electromagnetic system, wherein the contact system and the electromagnetic system are both arranged in the housing;

[0020] The electromagnetic system and the contact system are arranged along a first direction, and the electromagnetic system and the mutual inductor are arranged along a second direction, wherein the first direction is perpendicular to the second direction; the electromagnetic system is located in the middle of the electric meter.

[0021] Beneficial effects of the utility model:

[0022] The load switch provided by the utility model includes a contact system, which includes a busbar, a movable contact, a stationary contact, and a clamping structure, wherein: one end of the movable contact is rotatably connected to the busbar, and the other end of the movable contact can contact or separate from the stationary contact; the clamping structure is used to provide a clamping force to tightly fit the busbar and the movable contact. The load switch has the following advantages: 1. There is no problem of soft connection disconnection, and the circuit is more stable and reliable; 2. The movable contact is not subject to resistance caused by the soft connection during rotation, and the rotation of the movable contact is more flexible; 3. The contact system is easy to disassemble and assemble and occupies a small space; 4. Under the clamping force provided by the clamping structure, the busbar and the movable contact can be tightly fitted, thereby improving the reliability of the connection between the busbar and the movable contact.

[0023] The utility model provides an electric meter comprising a mutual inductor and the aforementioned load switch; the load switch further comprises a housing and an electromagnetic system, wherein the contact system and the electromagnetic system are both disposed within the housing; the electromagnetic system and the contact system are arranged along a first direction, and the electromagnetic system and the mutual inductor are arranged along a second direction, wherein the first direction is perpendicular to the second direction; the electromagnetic system is located in the middle of the electric meter. The electric meter has all the technical effects of the aforementioned load switch; furthermore, because the electromagnetic system is located in the middle of the electric meter and is relatively far from the side walls of the electric meter, any magnetic sources external to the electric meter will not affect the normal operation of the electromagnetic system, thereby ensuring stable and reliable operation of the load switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 A schematic diagram of the internal structure of a load switch provided by an embodiment of one aspect of the present utility model;

[0026] Figure 2 An exploded view of a contact system provided by an embodiment of one aspect of the present invention;

[0027] Figure 3 This is a schematic diagram of the assembly of a busbar, a moving contact and a clamping structure provided by an embodiment of one aspect of the present invention;

[0028] Figure 4 A schematic diagram of the assembly of a first clamping structure and a contact support provided by an embodiment of one aspect of the present utility model;

[0029] Figure 5A three-dimensional schematic diagram of a first clamping structure provided in an embodiment of one aspect of the present invention;

[0030] Figure 6 A three-dimensional schematic diagram of a second clamping structure provided by an embodiment of one aspect of the present invention;

[0031] Figure 7 A schematic diagram of the three-dimensional structure of a load switch (without the housing) provided in one embodiment of the present utility model;

[0032] Figure 8 A schematic diagram of an assembly of a load switch and a mutual inductor in an electric meter provided by another embodiment of the present utility model;

[0033] Figure 9 This is a schematic diagram of the internal structure of an electric meter provided in another embodiment of the present utility model.

[0034] icon:

[0035] 1-contact system; 11-busbar; 111-external circuit portion; 112-contact connection portion; 12-moving contact; 121-moving contact piece; 13-stationary contact; 14-first clamping structure; 141-first extrusion portion; 1411-first pressing piece; 1412-first protrusion; 142-connecting portion; 15-contact bracket; 151-support base plate; 152-support side plate; 153-limiting block; 16-rotating shaft; 17-second clamping structure; 171-second extrusion portion; 1711-second pressing piece; 1712-second protrusion; 172-mounting portion;

[0036] 2-shell;

[0037] 3-electromagnetic system; 31-linkage structure;

[0038] 4-Micro switch;

[0039] 5-conductive plug terminals;

[0040] 6- Circuit board;

[0041] 100-transformer; 101-connection terminal. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] It should be noted that in the description of this utility model, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] It should be noted that in the description of this utility model, the terms "connection" and "installation" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; direct connection or connection through an intermediate medium; mechanical connection or electrical connection. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to the specific circumstances.

[0045] The existing load switch uses a flexible connection to connect the busbar 11 and the moving contact 12. The flexible connection is easy to break after multiple bending and the interfaces at both ends of the flexible connection are easy to disconnect, resulting in circuit instability. In addition, the flexible connection has the defects of being inconvenient to disassemble and assemble and taking up a large space.

[0046] Based on this, the present invention provides a load switch according to one embodiment. Figure 1 The load switch includes a contact system 1, which includes a busbar 11, a moving contact 12, a static contact 13 and a clamping structure, wherein: one end of the moving contact 12 is rotatably connected to the busbar 11, and the other end of the moving contact 12 can contact or separate from the static contact 13; the clamping structure is used to provide a clamping force that makes the busbar 11 and the moving contact 12 fit tightly.

[0047] In the above structure, one end of the moving contact 12 is rotatably connected to the busbar 11, and the moving contact 12 and the busbar 11 are tightly fitted together under the action of the clamping structure, thereby achieving the connection between the moving contact 12 and the busbar 11 and eliminating the soft connection between the busbar 11 and the moving contact 12. Since the soft connection is eliminated, the load switch provided by the present application has the following advantages: 1. There is no problem of soft connection disconnection, and the circuit is more stable and reliable; 2. The moving contact 12 is not subject to the resistance caused by the soft connection during rotation, and the rotation of the moving contact 12 is more flexible; 3. The contact system is easy to assemble and disassemble and occupies a small space; 4. Under the clamping force provided by the clamping structure, the busbar 11 and the moving contact 12 can be tightly fitted, thereby improving the reliability of the connection between the busbar 11 and the moving contact 12.

[0048] Continue to refer to Figure 1The load switch further includes a housing 2 and an electromagnetic system 3, wherein the contact system 1 and the electromagnetic system 3 are both disposed within the housing 2. The load switch provided in this embodiment utilizes the electromagnetic force generated by the electromagnetic system 3 to drive the movable contact 12 to rotate, thereby achieving the purpose of conducting or disconnecting the circuit.

[0049] Reference Figure 2 and Figure 3 The busbar 11 has an L-shaped structure, which includes an external circuit part 111 and a contact connecting part 112. The external circuit part 111, the contact connecting part 112 and the moving contact 12 are connected in sequence to form a U-shaped conductive path; the external circuit part 111 is located on the side of the moving contact 12 facing away from the moving contact point.

[0050] During operation of the load switch, current flows through a U-shaped conductive path formed by the external circuit portion 111, the contact connection portion 112, and the movable contact 12. The current directions in the external circuit portion 111 and the movable contact 12 are opposite, so there is a repulsive force between the external circuit portion 111 and the movable contact 12. Under the action of the electric repulsive force, the connection between the movable contact 12 and the static contact 13 is more stable and reliable.

[0051] Furthermore, the movable contact 12 includes two movable contact pieces 121 arranged side by side and spaced apart, and the contact connection portion 112 of the busbar 11 is inserted between the two movable contact pieces 121. The clamping structure is used to provide a clamping force to move the two movable contact pieces 121 toward each other, thereby tightly clamping the contact connection portion 112 between the two movable contact pieces 121.

[0052] Continue to refer to Figure 3 The clamping structure includes a first clamping structure 14, which includes two first extrusion parts 141. The busbar 11 and the moving contact 12 are clamped between the two first extrusion parts 141. The above structure uses the clamping force formed by the two first extrusion parts 141 to make the busbar 11 and the moving contact 12 fit tightly.

[0053] Specifically, the first clamping structure 14 also includes a connecting portion 142 connected between the two first extrusion portions 141; one of the first extrusion portions 141, the connecting portion 142 and the other first extrusion portion 141 are connected end to end in sequence to form a U-shaped sheet structure, and the busbar 11 and the moving contact 12 are inserted into the above-mentioned U-shaped sheet structure.

[0054] In this embodiment, the first clamping structure 14 is integrally formed by a metal sheet bending process. In other embodiments, the first clamping structure 14 can also be integrally formed by an injection molding process.

[0055] Reference Figure 4The contact system 1 also includes a contact bracket 15, which includes a supporting base plate 151 and supporting side plates 152 connected to opposite sides of the supporting base plate 151. The moving contact 12 is mounted on the contact bracket 15 and located between the two supporting side plates 152; a limit block 153 is provided on the supporting base plate 151 and is engaged with the connecting portion 142.

[0056] Specifically, the busbar 11 and the contact support 15 are both mounted within the housing 2; a rotating shaft 16 is provided on each supporting side plate 152; the two movable contacts 12 are located between the two supporting side plates 152 and are respectively mounted on the two rotating shafts 16, with a gap between the two rotating shafts 16 for inserting the busbar 11; the first clamping structure 14 is located between the two supporting side plates 152, and the connecting portion 142 is clamped to the supporting base plate 151. In the above structure, the contact support 15 supports the movable contacts 12 and the first clamping structure 14; in addition, the two supporting side plates 152 can limit the degree of movement of the two first extrusion portions 141 away from each other, thereby increasing the clamping force of the first extrusion portions 141 on the busbar 11 and the movable contacts 12.

[0057] In this embodiment, the contact support 15 and the rotating shaft 16 are integrally formed to improve processing and assembly efficiency.

[0058] Reference Figure 5 Each first extrusion portion 141 is provided with a first protrusion 1412 that protrudes toward the movable contact 12. Furthermore, the first protrusion 1412 is provided at one end of the first extrusion portion 141 away from the connecting portion 142. The provision of the first protrusion 1412 not only increases the clamping force of the first clamping structure 14 on the busbar 11 and the movable contact 12, but also reduces the contact area between the first extrusion portion 141 and the movable contact 12, thereby reducing the effect of the first extrusion portion 141 on the rotation of the movable contact 12.

[0059] In this embodiment, the first protrusion 1412 is arc-shaped. The configuration of the first protrusion 1412 makes the first extrusion portion 141 and the moving contact 12 in line contact, thereby further reducing the contact area between the first extrusion portion 141 and the moving contact 12, making the rotation of the moving contact 12 more flexible.

[0060] Based on the above structure, each first extrusion portion 141 includes two first pressing pieces 1411, and the two first pressing pieces 1411 are respectively located on opposite sides of the rotation axis of the movable contact 12; each first pressing piece 1411 is provided with a first protrusion 1412 protruding toward the movable contact 12. This arrangement, on the one hand, ensures a more uniform clamping force around the rotation axis of the movable contact 12, thereby improving the reliability of the connection between the busbar 11 and the movable contact 12; on the other hand, the two first pressing pieces 1411 are respectively located on opposite sides of the rotating shaft 16, so that the rotating shaft 16 can limit the first extrusion portion 141, thereby improving the installation reliability of the first clamping structure 14.

[0061] Reference Figure 5 and Figure 6 The contact system 1 further includes a second clamping structure 17 mounted on the busbar 11 . The second clamping structure 17 includes two second extrusion portions 171 . The busbar 11 and the moving contact 12 are clamped between the two second extrusion portions 171 .

[0062] Specifically, the second clamping structure 17 further includes two mounting portions 172, which are connected to the two second extrusion portions 171 in a one-to-one correspondence, and the two mounting portions 172 are respectively connected to opposite sides of the busbar 11. In this embodiment, a corresponding set of second extrusion portions 171 and mounting portions 172 are integrally formed using a metal sheet bending process.

[0063] Based on the above structure, the second pressing portion 171 includes two second pressing pieces 1711, which are located on opposite sides of the rotation axis of the movable contact 12. Each second pressing piece 1711 is provided with a second protrusion 1712 that protrudes toward the movable contact 12. In this embodiment, the second protrusion 1712 is also arc-shaped and is in linear contact with the movable contact 12, making the movable contact 12 more flexible in rotation.

[0064] Continue to refer to Figure 3 and Figure 4 In the corresponding set of second extrusion portion 171 and mounting portion 172, the mounting portion 172 is rotatably connected to the contact connection portion 112, one end of the second extrusion portion 171 is connected to the mounting portion 172, and the other end of the second extrusion portion 171 is inserted between the moving contact 12 and one of the supporting side plates 152. The two second pressing pieces 1711 of the second extrusion portion 171 are respectively located on opposite sides of the rotating shaft 16. The above structure realizes the limited installation of the second clamping structure 17.

[0065] It should be noted that, in the contact system 1 , the first clamping structure 14 and the second clamping structure 17 may exist at the same time, or one of them may exist selectively, which is not limited here.

[0066] In summary, in the contact system 1 provided in this embodiment, the contact connecting portion 112 of the busbar 11 is inserted between the two moving contact pieces 121, and the contact connecting portion 112 and the moving contact 12 are clamped between the two first extrusion portions 141 and / or the two second extrusion portions 171, wherein the two first extrusion portions 141 are installed on the contact bracket 15, and the two second extrusion portions 171 are installed on the busbar 11; each first extrusion portion 141 is provided with two first protrusions 1412, and each second extrusion portion 171 is provided with two second protrusions 1712, and the first protrusions 1412 and / or the second protrusions 1712 arranged on the same side are distributed around the rotation axis of the moving contact 12. The above arrangement enables the busbar 11 and the moving contact 12 to maintain a close fit for a long time, thereby improving the reliability of the connection between the busbar 11 and the moving contact 12; furthermore, the first clamping structure 14 and the second clamping structure 17 are both in line contact with the moving contact 12, which enables the moving contact 12 to rotate more flexibly; in addition, the first clamping structure 14 and the second clamping structure 17 are made of metal sheets, so the clamping structure is conductive, which can further improve the stability of the current flowing in the contact system 1.

[0067] Reference Figure 7 A micro switch 4 is provided between the electromagnetic system 3 and the contact system 1 for detecting the opening and closing state of the contact system 1. Specifically, a linkage structure 31 is provided on the electromagnetic system 3 to cooperate with the micro switch 4 for detection. The micro switch 4 transmits one of the states to the outside of the load switch through the conductive plug terminal 5.

[0068] Alternatively, the linkage structure 31 may be a bump or a guide rod that abuts against the spring of the microswitch 4. During operation of the load switch, the electromagnetic force generated by the electromagnetic system 3 drives the linkage structure 31 to move relative to the microswitch 4. During this movement, the linkage structure 31 pushes the spring of the microswitch 4 to rotate, thereby enabling the microswitch 4 to obtain the open / closed state of the contact system 1. The microswitch 4 transmits the open / closed state of the contact system 1 to the outside of the load switch via the conductive plug terminal 5.

[0069] Furthermore, the micro switch 4 and the conductive plug terminal 5 can also be connected via a circuit board 6, so that the relative distance between the micro switch 4 and the conductive plug terminal 5 is not limited by the installation position of the micro switch 4 and can be adjusted arbitrarily according to specific circumstances. Figure 7 As shown, the conductive plug terminal 5 is located at the edge of the load switch, and the micro switch 4 is located in the middle of the load switch.

[0070] Another embodiment of the present invention provides an electric meter, which includes the load switch provided by any of the above embodiments. The electric meter has at least all the technical effects of the above load switches, which will not be repeated here.

[0071] Reference Figure 8 and Figure 9 The electric meter also includes a mutual inductor 100. The terminals of the static contact 13 extend sequentially through the housing 2 and the mutual inductor 100. The electromagnetic system 3 and the contact system 1 are arranged along a first direction, and the electromagnetic system 3 and the mutual inductor 100 are arranged along a second direction, wherein the first direction is perpendicular to the second direction. The electromagnetic system 3 is located in the middle of the electric meter.

[0072] In the above structure, the electromagnetic system 3 is closer to the middle position of the meter than the contact system 1, so that the electromagnetic system 3 is farther away from the side wall of the meter. This setting can prevent the magnetic source that may exist outside the meter from affecting the normal operation of the electromagnetic system 3, ensuring that the load switch can operate stably and reliably.

[0073] In this embodiment, the transformer 100 includes a transformer body and a terminal block 101 disposed on the transformer body. The busbar 11 terminal, the static contact 13 terminal, and the terminal block 101 are disposed on the same side and form a wiring structure. The electromagnetic system 3, the transformer body, and the wiring structure are arranged along the second direction. It should be noted that the busbar 11 terminal, i.e., the end of the external circuit portion 111, is distal to the contact connection portion 112.

[0074] In the above structure, the connection terminals of the busbar 11, the connection terminals of the static contact 13 and the connection terminals 101 are arranged on the same side, which facilitates the connection of the meter and also makes the internal circuit of the meter simple and clear.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A load switch, characterized in that: The invention comprises a contact system (1), wherein the contact system (1) comprises a busbar (11), a movable contact (12), a stationary contact (13) and a clamping structure, wherein: one end of the movable contact (12) is rotatably connected to the busbar (11), and the other end of the movable contact (12) can be in contact with or separated from the stationary contact (13); and the clamping structure is used to provide a clamping force for tightly fitting the busbar (11) and the movable contact (12).

2. The load switch according to claim 1, characterized in that: The clamping structure comprises a first clamping structure (14), the first clamping structure (14) comprises two first extrusion parts (141) arranged opposite to each other, and the busbar (11) and the moving contact (12) are clamped between the two first extrusion parts (141).

3. The load switch according to claim 2, characterized in that: The first clamping structure (14) further comprises a connecting portion (142), wherein one of the first extrusion portions (141), the connecting portion (142) and another of the first extrusion portions (141) are sequentially connected to form a U-shaped sheet structure.

4. The load switch according to claim 3, characterized in that: The contact system (1) further comprises a contact support (15), the contact support (15) comprising a support base plate (151) and two support side plates (152) respectively connected to opposite sides of the support base plate (151), the moving contact (12) being mounted on the contact support (15) and located between the two support side plates (152); The supporting base plate (151) is provided with a limiting block (153) that is engaged with the connecting portion (142).

5. The load switch according to claim 2, characterized in that: Each of the first extrusion portions (141) comprises two first pressing sheets (1411), and the two first pressing sheets (1411) are respectively located on opposite sides of the rotation axis of the moving contact (12); Each of the first pressing sheets (1411) is provided with a first protrusion (1412) protruding toward the moving contact (12).

6. The load switch according to claim 1, characterized in that: The clamping structure further comprises a second clamping structure (17) mounted on the busbar (11), the second clamping structure (17) comprising two second extrusion portions (171) arranged opposite to each other, and the busbar (11) and the moving contact (12) are clamped between the two second extrusion portions (171).

7. The load switch according to claim 6, characterized in that: The second clamping structure (17) further includes two mounting portions (172), the two mounting portions (172) being connected to the two second extrusion portions (171) in a one-to-one correspondence, and the two mounting portions (172) being respectively connected to opposite sides of the busbar (11).

8. The load switch according to any one of claims 1 to 7, characterized in that: The busbar (11) is in an L-shaped structure, comprising an external circuit portion (111) and a contact connection portion (112), wherein the external circuit portion (111), the contact connection portion (112) and the movable contact (12) are sequentially connected to form a U-shaped conductive path; The external circuit portion (111) is located on a side of the moving contact (12) facing away from the moving contact point.

9. The load switch according to any one of claims 1 to 7, characterized in that: The moving contact (12) comprises two moving contact pieces (121) arranged side by side and spaced apart, and the contact connection portion (112) of the busbar (11) is inserted between the two moving contact pieces (121).

10. An electric meter, characterized in that: comprising a mutual inductor (100) and a load switch according to any one of claims 1 to 9; The load switch further comprises a housing (2) and an electromagnetic system (3), wherein the contact system (1) and the electromagnetic system (3) are both arranged in the housing (2); The electromagnetic system (3) and the contact system (1) are arranged along a first direction, and the electromagnetic system (3) and the mutual inductor (100) are arranged along a second direction, wherein the first direction is perpendicular to the second direction; and the electromagnetic system (3) is located in the middle of the electric meter.

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