Shunt assembly and energy meter
By dividing the circuit of the shunt assembly into two parts and connecting them by plugging or soldering, the problem of increased installation difficulty and cost caused by traditional shunt terminals is solved, signal isolation and stable connection are achieved, and the metering accuracy and installation convenience of the electricity meter are improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN CLOU ELECTRONICS
- Filing Date
- 2025-06-25
- Publication Date
- 2026-07-03
AI Technical Summary
The terminals of traditional shunts increase installation difficulty and cost, and also pose signal interference problems.
The shunt assembly divides the circuit into two parts: one part is in the shunt's wiring section and current pins, and the other part is in the circuit connection of the circuit board. It is connected to the circuit board through the current pins, and electrical isolation is achieved by setting current sampling terminals. It is connected by plug-in or soldering methods to reduce the number of terminals.
The installation process of the shunt was simplified and production costs were reduced, while signal interference was reduced and metering accuracy and connection stability were improved.
Smart Images
Figure CN224458660U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electronic instrument technology, and in particular to a shunt assembly and an energy meter. Background Technology
[0002] In the field of electricity metering, electricity meters, as important devices for measuring and recording electrical energy consumption, are widely used in industrial, commercial, and residential electricity scenarios. With the development of smart grids and the increasing demand for refined management of electricity data, electricity meters not only need to have high-precision electricity metering capabilities, but also good stability and reliability to adapt to complex and ever-changing electrical environments.
[0003] Traditional electricity meters typically use electromagnetic current transformers or shunts to acquire current signals. Among these, shunts are widely used in low-voltage, low-current measurement applications due to their simple structure, fast response, and good linearity. In related technologies, shunts usually have terminals at both ends to connect them in series with the conductor. The shunt and terminals are typically connected using methods such as welding or screwing. However, the presence of terminals increases the installation difficulty and cost of the shunt. Utility Model Content
[0004] The main purpose of this utility model is to propose a shunt assembly and an energy meter, which aims to save the terminals of the shunt connection wires, reduce the installation difficulty and production cost of the shunt.
[0005] To achieve the above objectives, the shunt assembly proposed in this utility model is applied to an electricity meter, the shunt assembly comprising:
[0006] A shunt, comprising a first wiring portion, a current pin, and a voltage pin, wherein the current pin and the voltage pin are connected to the first wiring portion, the current pin being provided with a current sampling terminal, and the first wiring portion being used to connect a wire; and
[0007] The circuit board has a second wiring portion. The circuit board includes a main circuit and a connecting circuit that are isolated from each other. The second wiring portion is electrically connected to the connecting circuit. The current pin and the voltage pin are fixed to the circuit board. The current pin is electrically connected to the connecting circuit. The current sampling terminal is electrically connected to the main circuit. The second wiring portion is used to connect wires.
[0008] In one embodiment, the voltage pin and the current pin are located on opposite edges of the first wiring portion and extend on the same side of the first wiring portion.
[0009] In one embodiment, the circuit board is provided with a first insertion hole and a second insertion hole, the voltage pin is inserted into the first insertion hole, and the current pin is inserted into the second insertion hole.
[0010] In one embodiment, the voltage pin is provided with a first welding protrusion, and the current pin is provided with a second welding protrusion. The first welding protrusion is connected to the first insertion hole by welding, and the second welding protrusion is connected to the second insertion hole by welding.
[0011] In one embodiment, the current sampling terminal is connected to the same side of the current pin, and in the distribution direction of the current pin and the current sampling terminal, the first welding protrusion is disposed closer to the current sampling terminal than the second welding protrusion.
[0012] In one embodiment, the first terminal is connected to the wire by means of a screw.
[0013] In one embodiment, the first wiring portion is provided with a connecting cylinder, the connecting cylinder passing through the first wiring portion and forming a connecting hole on the first wiring portion, and the inner circumference of the connecting cylinder is provided with threads.
[0014] In one embodiment, the first wiring portion and the circuit board are parallel to each other, the connecting cylinder is located on the side of the first wiring portion facing the circuit board, and the side of the first wiring portion away from the circuit board is flush with it.
[0015] In one embodiment, the current sampling terminal is configured as a pin, the circuit board is provided with a sampling hole, and the current sampling terminal is inserted into the circuit board.
[0016] In one embodiment, the shunt is made of manganese copper.
[0017] This utility model also proposes an electricity meter, which includes the aforementioned shunt assembly.
[0018] The technical solution of this utility model divides the circuit of the shunt into two parts. One part is located in the first wiring section and current pin of the shunt, and the other part is located in the connecting circuit and second wiring section of the circuit board. On the one hand, the current pin is electrically connected to the connecting circuit on the circuit board, while the current sampling terminal on the current pin is electrically connected to the main circuit. The two are isolated from each other, achieving effective electrical isolation between the current sampling circuit and the circuit under test, thereby reducing signal interference and ensuring measurement accuracy. On the other hand, it can reduce the number of connection points between the shunt and the conductor. Only the first wiring section needs to be set on the shunt, which is used to directly connect the wire. The second wiring section on the circuit board is also directly connected to the wire, saving the terminals required for connecting the wire to the shunt, thereby simplifying the assembly steps and manufacturing costs associated with setting terminals, and thus reducing the installation difficulty and production cost of the shunt. In addition, the current pin and voltage pin are fixed on the circuit board, providing support for the connection between the first wiring section and the wire, thereby ensuring the connection stability between the shunt and the wire. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0020] Figure 1 A schematic diagram of the structure of an embodiment of the shunt assembly provided by this utility model;
[0021] Figure 2 for Figure 1 A schematic diagram of the middle splitter assembly from another perspective;
[0022] Figure 3 for Figure 1 Exploded view of the intermediate splitter assembly;
[0023] Figure 4 for Figure 1 Schematic diagram of the middle splitter;
[0024] Figure 5 for Figure 1 A schematic diagram of the middle splitter from another perspective.
[0025] Explanation of icon numbers:
[0026] 100, Shunt; 110, First wiring section; 111, Connecting cylinder; 112, Connecting hole; 120, Current pin; 121, Second welding protrusion; 130, Voltage pin; 131, First welding protrusion; 140, Current sampling terminal; 200, Circuit board; 210, First insertion hole; 220, Second insertion hole; 230, Sampling hole.
[0027] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.
[0029] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.
[0030] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0031] This utility model proposes a shunt assembly.
[0032] Please refer to Figures 1 to 3 In one embodiment of this utility model, the shunt assembly is applied to an electricity meter, and the shunt assembly includes:
[0033] Shunt 100 includes a first wiring portion 110, a current pin 120, and a voltage pin 130. The current pin 120 and the voltage pin 130 are connected to the first wiring portion 110. The current pin 120 is provided with a current sampling terminal 140. The first wiring portion 110 is used to connect wires (not shown in the figure).
[0034] The circuit board 200 is provided with a second wiring section (not shown in the figure). The circuit board 200 includes a main circuit (not shown in the figure) and a connecting circuit (not shown in the figure) that are isolated from each other. The second wiring section is electrically connected to the connecting circuit. The current pin 120 and the voltage pin 130 are fixed to the circuit board 200. The current pin 120 is electrically connected to the connecting circuit. The current sampling terminal 140 is electrically connected to the main circuit. The second wiring section is used to connect wires.
[0035] The technical solution of this utility model is divided into two parts by the circuit of the shunt 100 connected in series. One part is located in the first wiring part 110 and the current pin 120 of the shunt 100, and the other part is located in the connecting circuit and the second wiring part of the circuit board 200. On the one hand, the current pin 120 is electrically connected to the connecting circuit on the circuit board 200, while the current sampling terminal 140 set on the current pin 120 is electrically connected to the main circuit. The two are isolated from each other, realizing effective electrical isolation between the current sampling circuit and the circuit under test, thereby reducing signal interference and ensuring measurement accuracy. On the other hand, the connection positions of the shunt 100 and the conductor can be reduced. The first wiring part 110 can be set on the shunt 100. The first wiring part 110 is used to directly connect the wires. The second wiring part of the circuit board 200 is also directly connected to the wires, saving the terminals required for connecting the wires in the shunt 100. This simplifies the assembly steps and manufacturing costs caused by setting terminals, thereby reducing the installation difficulty and production cost of the shunt 100. In addition, the current pin 120 and the voltage pin 130 are fixed on the circuit board 200 to provide support for the first wiring part 110 and the wire connection, thereby ensuring the connection stability of the shunt 100 and the wire.
[0036] It should be noted that the first wiring section 110, the current pin 120, the connecting circuit, and the second wiring section are sequentially electrically connected. The first wiring section 110 is electrically connected to a wire, and the second wiring section is electrically connected to another wire, forming a shunt 100 connected in series in the circuit under test. The first wiring section 110, the current pin 120, the current sampling terminal 140, and the main circuit are sequentially electrically connected. The first wiring section 110 is electrically connected to a wire, forming a current sampling circuit. Furthermore, there are two current sampling terminals 140, spaced apart in the direction of current flow from the current pin 120. Additionally, the circuit board 200 also includes a voltage signal sampling circuit (not shown in the figure), forming a voltage sampling circuit consisting of the first wiring section 110, the voltage pin 130, and the sampling circuit. It is understood that the main circuit, the connecting circuit, and the sampling circuit are mutually insulated and isolated, and are not interconnected. In this technical solution, the circuit board 200 refers to a circuit board 200 with electrical components, rather than an empty circuit board. For connected circuits, the main components are copper-clad wires on the circuit board 200, which are connected in series with the shunt 100 to the circuit under test. For the main circuit and the sampling circuit, in addition to being mutually insulated and isolated, they also include copper-clad wires on the circuit board 200 and electrical components on the circuit board 200, which can be used for energy measurement.
[0037] Regarding the material of the splitter 100, in one embodiment, please refer to... Figures 3 to 5 The shunt 100 is made of manganese bronze. Manganese bronze possesses excellent conductivity and a low temperature coefficient, maintaining a stable resistance value over a wide temperature range. This ensures the accuracy and repeatability of the current sampling signal, effectively improving the metering accuracy and long-term operational stability of the energy meter. Manganese bronze also exhibits excellent fatigue resistance and corrosion resistance, able to withstand frequent current load changes and environmental influences, enhancing the durability and reliability of the shunt 100 and extending the lifespan of the energy meter. Furthermore, the excellent machinability of manganese bronze facilitates refined structural design, allowing the shunt 100 to be mounted more stably on the circuit board 200, ensuring the connection stability between the circuit board 200 and the shunt 100. Considering the high material cost of terminals, the manganese bronze shunt 100 connects directly to the wires, reducing the number of terminals and thus lowering the cost of the energy meter. The shunt 100 can also be made of constantan or a copper-nickel alloy.
[0038] In one embodiment, please refer to Figures 3 to 5Voltage pin 130 and current pin 120 are respectively located on opposite edges of the first wiring portion 110 and extend on the same side of the first wiring portion 110. It can be understood that voltage pin 130 and current pin 120 are located at the edges of the first wiring portion 110 and are arranged opposite each other, providing support on both sides of the stress-bearing position of the connection between the first wiring portion 110 and the wire. This makes the force on the shunt 100 more uniform when it is installed on the circuit board 200, effectively enhancing the structural stability of the shunt assembly and reducing the risk of deformation or displacement caused by uneven force or local stress concentration. At the same time, current pin 120 and voltage pin 130 avoid the connection position between the first wiring portion 110 and the wire, avoiding interference with the connection between the shunt 100 and the wire, thereby ensuring the convenience of connection operation between the first wiring portion 110 and the wire. Of course, in other embodiments, current pin 120 can also be independently supported on the circuit board 200, with voltage pin 130 and current sampling terminal 140 distributed around the periphery of current pin 120 and electrically connected to the corresponding circuit on the circuit board 200.
[0039] Furthermore, in this embodiment, please refer to Figures 1 to 3 The circuit board 200 is provided with a first insertion hole 210 and a second insertion hole 220. The voltage pin 130 is inserted into the first insertion hole 210, and the current pin 120 is inserted into the second insertion hole 220. It can be understood that by configuring independent insertion holes for the voltage pin 130 and the current pin 120, such as the first insertion hole 210 and the second insertion hole 220, a stable combination of electrical connection and mechanical fixation between the shunt 100 and the circuit board 200 is achieved. After the voltage pin 130 and the current pin 120 are respectively inserted into their corresponding connection holes 112, not only is the independence and accuracy of their respective signal transmission paths ensured, but also the occurrence of poor contact and loose connection is reduced, improving the overall reliability of the electrical connection. At the same time, the shunt 100 is connected to the circuit board 200 by insertion, improving installation efficiency and facilitating automated production. Furthermore, by rationally arranging the positions of the first insertion hole 210 and the second insertion hole 220, the current flow path on the circuit board 200 can be further optimized, electromagnetic interference can be reduced, and the stability and accuracy of signal acquisition can be enhanced, thereby effectively supporting the stable operation of the energy meter in complex electrical environments. Of course, in other embodiments, the voltage pin 130 or the current pin 120 can also be electrically connected to the corresponding circuit of the circuit board 200 by soldering.
[0040] Furthermore, in this embodiment, please refer to Figure 2 , Figure 3 and Figure 5The voltage pin 130 is provided with a first welding protrusion 131, and the current pin 120 is provided with a second welding protrusion 121. The first welding protrusion 131 is connected to the first insertion hole 210 by welding, and the second welding protrusion 121 is connected to the second insertion hole 220 by welding. By providing the first welding protrusion 131 and the second welding protrusion 121 on the voltage pin 130 and the current pin 120 respectively, and welding them to the first insertion hole 210 and the second insertion hole 220 on the circuit board 200 respectively, the stability and reliability of the electrical and mechanical connection between the shunt 100 and the circuit board 200 are improved. Furthermore, the welded protrusion increases the welding contact area and improves the welding strength, which can prevent the connection of the shunt 100 from loosening or falling off due to vibration, thermal expansion or mechanical impact, thereby ensuring the stability and safety of the electricity meter in long-term operation.
[0041] In one embodiment, please refer to Figure 2 , Figure 3 and Figure 5 The current sampling terminal 140 is connected to the same side of the current pin 120. In the distribution direction of the current pin 120 and the current sampling terminal 140, the first welding protrusion 131 is positioned closer to the current sampling terminal 140 than the second welding protrusion 121. It should be noted that the current sampling terminal 140 being connected to the same side of the current pin 120 means that the current sampling terminal 140 and the second welding protrusion 121 are on the same straight line and spaced apart at the connection point to the circuit board 200, wherein this straight line does not intersect with the first welding protrusion 131. This ensures that the voltage pin 130 and the current pin 120 are in a parallel orientation, and the corresponding current sampling terminal 140 and the voltage pin 130 are also in a parallel orientation. It can be seen that the three positions of the first welding protrusion 131, the second welding protrusion 121, and the current sampling terminal 140 form a triangle, and the corners of this triangle corresponding to the second welding protrusion 121 and the current sampling terminal 140 are acute angles, forming a stable triangular support mechanism, thereby improving the connection stability and deformation resistance of the shunt 100 on the circuit board 200. In addition, the second welding protrusion 121 can form a sufficient gap with the current sampling terminal 140, reducing the interference of the tested circuit to the current sampling circuit and helping to improve the stability of the signal transmission path. Of course, in other embodiments, the connection position of the current sampling terminal and the circuit board 200 can also be set between the first welding protrusion 131 and the second welding protrusion 121.
[0042] Regarding the connection method between the current sampling terminal 140 and the circuit board 200, in one embodiment, please refer to... Figures 3 to 5 The current sampling terminal 140 is configured as a pin, and the circuit board 200 is provided with a sampling hole 230. The current sampling terminal 140 is inserted into the circuit board 200. It should be noted that the current sampling terminal 140 is first connected to the side of the current pin 120, and then bent into a vertical position and inserted into the circuit board 200. It can be understood that the current sampling terminal 140 can be directly inserted into the circuit board 200 in a plug-in manner to form a stable and reliable electrical connection with the main circuit of the circuit board 200, which simplifies the connection structure between the current sampling terminal 140 and the circuit board 200. Combined with the above description that the current pin 120 is inserted into the second plug-in hole 220 and the voltage pin 130 is inserted into the first plug-in hole 210, the shunt 100 of this embodiment can complete the connection of the current pin 120, voltage pin 130 and sampling terminal to the circuit board 200 in one plug-in operation, which improves the assembly efficiency of the shunt 100 and the stability of the connection to the circuit board 200. The use of a pin-type current sampling terminal 140 that mates with the sampling hole 230 on the circuit board 200 eliminates the need for additional space and components required by traditional screw fixing or wire connections, achieving a more compact and integrated connection between the shunt 100 and the circuit board 200. Furthermore, the connection method between the pin and the sampling hole 230 offers good disassembly and interchangeability, facilitating quick replacement of the shunt 100 or circuit board 200 and improving the ease of maintenance of the energy meter. Without loss of generality, after the current sampling terminal 140 is inserted into the sampling hole 230, it can also be soldered to the circuit board 200 to ensure the stability of the electrical connection between the current sampling terminal 140 and the circuit board 200.
[0043] Regarding the connection method between the first wiring portion 110 and the wire, in one embodiment, please refer to... Figure 4 and Figure 5 The first wiring portion 110 is connected to the conductor by screw fastening. While ensuring electrical connection stability and mechanical fixation reliability, the screw fastening method reduces the number of terminals, lowering costs and production difficulty. It also solves problems such as inconvenient installation, poor contact, and maintenance difficulties associated with welding or plug-in connections. The screw fastening structure makes the connection between the conductor and the shunt 100 more robust, capable of withstanding certain mechanical tension and vibration impacts, preventing loosening or disconnection due to external forces, thereby improving the operational stability of the energy meter in complex environments. Simultaneously, this method facilitates on-site installation and disassembly, improving maintenance efficiency and reducing operation and maintenance costs. Furthermore, the screw fastening connection has good conductivity and low contact resistance, helping to improve the accuracy and reliability of current sampling, further ensuring the long-term safety and accuracy of the energy meter. Of course, in other embodiments, the first wiring portion 110 can also be electrically connected to the conductor by welding.
[0044] Furthermore, in this embodiment, please refer to Figure 2 and Figure 5 The first wiring portion 110 is provided with a connecting sleeve 111, which extends through the first wiring portion 110 and forms a connecting hole 112 on the first wiring portion 110. The inner circumference of the connecting sleeve 111 is threaded. It can be understood that by providing a connecting sleeve 111 with internal threads, the connection between the first wiring portion 110 and the wire via screw fastening provides a longer screwing process for the screw, thereby improving the stability and conductivity of the connection between the first wiring portion 110 and the wire. Thus, the connecting sleeve 111 not only enhances the mechanical strength and stability of the first wiring portion 110, but also provides a reliable mating basis for screw fastening of the wire, enabling uniform distribution of tightening force through the threads, effectively preventing loosening of the connection between the first wiring portion 110 and the wire due to vibration or thermal expansion and contraction. Of course, in other embodiments, the stability of the connection between the first wiring portion 110 and the wire via screw fastening can also be enhanced by increasing the thickness of the first wiring portion 110.
[0045] In one embodiment, please refer to Figure 4 and Figure 5 The first wiring portion 110 and the circuit board 200 are parallel and opposite each other. The connecting cylinder 111 is located on the side of the first wiring portion 110 facing the circuit board 200, while the side of the first wiring portion 110 facing away from the circuit board 200 is flush with it. The connecting cylinder 111 is positioned on the side of the first wiring portion 110 closest to the circuit board 200 to reduce interference between the connecting cylinder 111 and the connecting wires. Simultaneously, the flush design on the side of the first wiring portion 110 facing away from the circuit board 200 facilitates lifting and ensures that the wires can make greater contact with the first wiring portion 110, reducing the resistance at the connection between the shunt 100 and the wires. Furthermore, the position of the connecting cylinder 111 reduces the protruding structure between the first wiring portion 110 and the wires, lowering the risk of external collisions or damage. In addition, the connecting tube 111 can effectively utilize the hole between the first wiring part 110 and the circuit board 200, making the shunt assembly more compact and reducing the distance between the stress position of the shunt 100 and the wire and the circuit board 200, so that the stress on the shunt 100 is more balanced, thereby effectively improving the installation stability and space utilization of the shunt assembly inside the energy meter.
[0046] This utility model also proposes an energy meter, which includes a shunt assembly. The specific structure of the shunt assembly is as described in the above embodiments. Since this energy meter adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here. The number of shunts can be set according to the phase requirements of the circuit being tested; for example, in a three-phase circuit, three shunts and one circuit board are set.
[0047] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.
Claims
1. A shunt assembly, characterized in that, The shunt assembly, used in electricity meters, includes: A shunt, comprising a first wiring portion, a current pin, and a voltage pin, wherein the current pin and the voltage pin are connected to the first wiring portion, the current pin being provided with a current sampling terminal, and the first wiring portion being used to connect a wire; and The circuit board has a second wiring portion. The circuit board includes a main circuit and a connecting circuit that are isolated from each other. The second wiring portion is electrically connected to the connecting circuit. The current pin and the voltage pin are fixed to the circuit board. The current pin is electrically connected to the connecting circuit. The current sampling terminal is electrically connected to the main circuit. The second wiring portion is used to connect wires.
2. The shunt assembly of claim 1, wherein, The voltage pin and the current pin are located on opposite edges of the first wiring portion and extend on the same side of the first wiring portion.
3. The shunt assembly of claim 2, wherein, The circuit board is provided with a first insertion hole and a second insertion hole. The voltage pin is inserted into the first insertion hole, and the current pin is inserted into the second insertion hole.
4. The shunt assembly of claim 3, wherein, The voltage pin is provided with a first welding protrusion, and the current pin is provided with a second welding protrusion. The first welding protrusion is connected to the first insertion hole by welding, and the second welding protrusion is connected to the second insertion hole by welding.
5. The shunt assembly of claim 4, wherein, The current sampling terminal is connected to the same side of the current pin. In the distribution direction of the current pin and the current sampling terminal, the first welding protrusion is positioned closer to the current sampling terminal than the second welding protrusion.
6. The shunt assembly of claim 1, wherein, The first terminal is connected to the wire by means of screw fastening.
7. The shunt assembly of claim 6, wherein, The first wiring part is provided with a connecting cylinder, which passes through the first wiring part and forms a connecting hole on the first wiring part. The inner circumference of the connecting cylinder is provided with threads.
8. The shunt assembly of claim 7, wherein, The first wiring portion and the circuit board are parallel and opposite each other. The connecting cylinder is located on the side of the first wiring portion facing the circuit board, and the side of the first wiring portion away from the circuit board is flush with it.
9. The shunt assembly of any one of claims 1 to 8, wherein, The current sampling terminal is configured as a pin, the circuit board is provided with a sampling hole, and the current sampling terminal is inserted into the circuit board; And / or, the shunt is made of manganese copper.
10. An electric energy meter, characterized by Includes the shunt assembly as described in any one of claims 1 to 9.