Modularly assembled soft starter

Abstract

A modularly-assembled soft starter provided by the present invention comprises a shell and a panel, the shell internally comprises a plurality of groups of heat dissipation assemblies, a circuit board and a silicon controlled rectifier, each heat dissipation assembly comprises heat dissipation pieces clamped on the two sides of the silicon controlled rectifier in a left-right manner, the side, corresponding to the panel, of each heat dissipation piece is the front side, and the front side and the rear side of each heat dissipation piece are both provided with installation sliding grooves. The mounting sliding groove is opened, the heat dissipation piece is connected with the first conducting strip through a fastening assembly, the fastening assembly is arranged in the mounting sliding groove in a sliding mode, the first conducting strip comprises a first connecting section connected with the fastening assembly and a second connecting section extending out of the shell, the first connecting section is provided with a first connecting hole, and the second connecting section is provided with a second connecting hole; the shell comprises a machine body and a wiring side plate, the wiring side plate is detachably connected with the machine body, and the wiring side plate is provided with an insertion hole for the second connecting section to stretch out. By adopting the technical scheme, different types of soft starters can be assembled according to customer requirements, the same mold is adopted, batch production is facilitated, and the production cost is reduced.

Description

Technical Field

[0001] The invention relates to the field of circuit equipment, and in particular to a modularly assembled soft starter. Background Art

[0002] A soft starter is a novel motor control device that integrates motor soft start, soft stop, light load energy saving and multiple protection functions. It is called Soft Starter abroad. Its main components are three-phase reverse parallel thyristor and its electronic control circuit connected in series between the power supply and the controlled motor. The soft starter controls the conduction angle of the internal thyristor so that the motor input voltage gradually rises from zero according to a preset function relationship until the start is completed and the motor is given full voltage, which is soft start. During the soft start process, the motor starting torque gradually increases and the speed also gradually increases. The existing soft starter includes a shell, the shell is provided with input pins and output pins, and the shell is provided with a heat dissipation component, a circuit board, and a current detection mutual inductor, thyristor and transformer electrically connected to the circuit board. The input pin and the output pin are both connected to the thyristor.

[0003] According to the operation mode, it is divided into online soft starter and bypass soft starter, and bypass soft starter is divided into built-in bypass and external bypass. According to the number of input pins and output pins, it is divided into three-input and three-output, three-input and six-output, six-input and three-output, etc. The internal structure of different types of soft starters is completely different. Therefore, the use scope of existing soft starters is relatively limited, and users can only choose specific types when purchasing. Due to different accessories and different molds required for production, the cost of manufacturers producing soft starters of various specifications and types is greatly increased. Summary of the invention

[0004] Based on the above problems, the present invention aims to provide a modularly assembled soft starter.

[0005] In view of the above problems, the following technical solutions are provided: a modularly assembled soft starter, comprising a shell and a panel, the shell comprising multiple groups of heat dissipation components, circuit boards and thyristors, the heat dissipation components comprising heat sinks clamped on both sides of the thyristors, the side of the heat sink corresponding to the panel being the front side, the front and rear sides of the heat sink are both provided with mounting grooves, at least one end of the mounting groove is open, the heat sink is connected to the first conductive sheet through a fastening component, the fastening component is slidably arranged in the mounting groove, the first conductive sheet comprises a first connecting section connected to the fastening component and a second connecting section extending out of the shell, the first connecting section is provided with a first connecting hole, and the second connecting section is provided with a second connecting hole, the shell comprises a body and a wiring side plate, the wiring side plate is detachably connected to the body, and the wiring side plate is provided with a jack for the second connecting section to extend out.

[0006] By adopting the above technical scheme, compared with the existing first conductive sheet that needs to be connected to the upper heat sink and the lower heat sink respectively, the shapes of the conductive sheets at the input end and the output end are inconsistent and need to be bent. The technical scheme of the present invention adopts the left and right clamping of the heat sink, and the first conductive sheet is arranged on the front side of the installation slide slot, and is arranged at the same height, without bending, which greatly reduces the power consumption caused by bending. At the same time, the front and rear sides of the heat sink are provided with installation slide slots. When the customer needs three-in and six-out or six-in and three-out, the fastening component is slidably arranged in the installation slide slot. It is only necessary to detachably connect the first conductive sheet with the input end or the output end of the installation slide slot on the rear side of the heat sink through the fastening component, so that the soft starter can have different applications and become different products. The wiring side plate is detachably connected to the body, which is convenient for quick assembly and replacement of different types of wiring side plates to meet different needs. The basic modular assembly is combined with the first conductive sheet of uniform shape, and different types of soft starters can be assembled according to customer needs. The same mold is used to facilitate mass production, greatly reduce production costs, and reduce the types of accessories and storage costs.

[0007] The present invention is further configured as follows: the mounting groove is configured in an inverted T-shape, and the front and rear sides of the heat sink are symmetrically configured; the fastening assembly includes a bolt, and the bolt includes a nut clamped in the mounting groove and a screw rod adapted to the first connecting hole; the screw rod passes through the first connecting hole and is threadedly connected to a nut disposed outside the heat sink.

[0008] By adopting the above technical solution, at least one end of the mounting slot is opened (one end is open or both ends are open), the nut moves from the opening into the mounting slot, and is thereby clamped in the mounting slot, and the screw passes through the first connecting hole and is threadedly connected to a nut arranged outside the heat sink, thereby realizing the connection between the heat sink and the first conductive sheet, and the assembly is simple and convenient.

[0009] The present invention is further configured as follows: the first conductive sheet also includes a connecting portion connecting the first connecting segment and the second connecting segment, the first connecting hole is aligned with the mounting groove, the center line of the second connecting segment is aligned with the center line of the interval of the same group of heat sinks, and the first connecting segment, the second connecting segment and the connecting portion are integrally formed and are at the same height.

[0010] By adopting the above technical solution, since each group of heat dissipation components has at least one input pin and one output pin, the input pin and the output pin are respectively connected to the heat sinks on both sides, so the center line of the second connection section is aligned with the center line of the interval of the heat sinks in the same group (that is, the middle of the interval of the heat sinks on the left and right sides), and the first conductive sheet is arranged in a Z-shape, then the second connection sections on both sides are arranged in the middle of the heat dissipation component, and the height positions of the jacks at the front and rear ends of its shell are aligned, then the first conductive sheets on the upper and lower sides (input ends or output ends) can be used universally, and the upper wiring side plate or the lower wiring side plate can also be used universally, further improving the processing efficiency, and can be replaced for easy assembly. When the soft starter wants to be converted from three-input and six-output to six-input and three-output (or vice versa), it is only necessary to remove the panel, rotate the body 180 degrees, and then assemble the panel with the body for easy use.

[0011] The present invention is further configured as follows: the heat dissipation components are divided into three groups, the number of the sockets on the wiring side panel is three, the sockets are arranged at the same height, the wiring side panel is provided with a fan port or an air grille at a position on the rear side corresponding to the heat dissipation component, and the fan port is detachably connected to a fan.

[0012] By adopting the above technical solution, according to customer needs, the upper wiring side panel or the lower wiring side panel can choose to adopt a three-hole wiring side panel with a fan or a three-hole wiring side panel with an air grille. The fan can be installed forward or reversely, and exhaust or blowing can be adopted according to customer needs. In the technical solution of the present invention, since the first conductive sheets at the upper and lower ends of the shell are both arranged in front of the heat sink, there is an assembly space for the fan between the first conductive sheet and the corresponding bottom wall of the body (this is the case for both the upper and lower ends of the shell), thereby greatly improving the versatility of the soft starter.

[0013] The present invention is further configured as follows: the heat dissipation components are divided into three groups, the number of the jacks on the wiring side panel is six, and the jacks are arranged in two rows, one above the other, with three jacks in each row.

[0014] By adopting the above technical solution, when the wiring side plate has six holes, it is a three-input and six-output or six-input and three-output soft starter. At this time, the first conductive sheet is arranged with six holes in the front and three holes in the back, and the "back three" are the input end (upper side) or the output end (lower side), which needs to be connected according to needs. When the wiring side plate has six holes, the upper and lower rows are aligned (the upper and lower relative positions here refer only to the same wiring side plate), and the number of holes in each row is three. The positions of the upper and lower rows of holes are adapted to the height of the connection between the first conductive sheet and the mounting grooves on the front and rear sides of the heat sink.

[0015] The present invention further provides that: an insulating plate is arranged between the heat dissipation components, and an insulating plate is arranged between the machine body and the heat dissipation components.

[0016] By adopting the above technical solution, the safety isolation space is greatly reduced by inserting the insulating plate, making the overall structure more compact and reducing the volume. At the same time, soft starters of different powers can achieve safe insulation by simply replacing insulating plates of different thicknesses (about 2-3mm, not limiting the size of the interval, but just to more intuitively reflect the difference from existing soft starters under the same specifications), which makes the soft starter have a wider range of uses, is conducive to standardized mass production of the shell, and greatly reduces the production cost; at the same time, due to the reduction of the interval space, the heat sink can be made larger, greatly improving the heat dissipation function, and can be started frequently without overheating, which is safer.

[0017] The present invention is further provided that: both sides of the input end of each group of heat dissipation components are respectively connected to the first conductive sheet and the second conductive sheet through fastening components, a DC contactor is arranged on the rear sides of the first conductive sheet and the second conductive sheet, the first conductive sheet is provided with a third connecting hole for connecting to the DC contactor, the third connecting hole is arranged on the second connecting section located in the shell, one end of the DC contactor is connected to the first conductive sheet through the third conductive sheet, the second conductive sheet is provided with a fourth connecting hole for connecting to the DC contactor, and the other end of the DC contactor is connected to the second conductive sheet through the fourth conductive sheet.

[0018] By adopting the above technical scheme, on the basis of the online soft starter in the technical scheme of the present invention, a DC contactor is added to transform it into a built-in bypass soft starter, and by adding a second conductive sheet on the other side of the input end of the heat dissipation component, the third conductive sheet and the fourth conductive sheet and the first conductive sheet and the second conductive sheet at both ends of the DC contactor are connected, so that the heat dissipation parts on both sides of the input end of the heat dissipation component are connected to the DC contactor, which is convenient and quick to assemble.

[0019] The present invention further provides: a current detection transformer and a transformer are arranged on one side of the output end of the shell corresponding to the heat dissipation component, the current detection transformer is provided with an installation through hole adapted to the second connecting section, and the current detection transformer is sleeved on the second connecting section through the installation through hole.

[0020] By adopting the above technical solution, the current detection transformer is sleeved on the second connecting section through the installation through hole, without the need for additional fixed connection, and the sleeve arrangement is adopted, which is convenient and quick to assemble.

[0021] The present invention is further provided that: a positioning boss is provided between the rear side of the heat sink and the inner wall of the shell, a fastening assembly for connecting the positioning boss and the heat sink is provided in the mounting groove on the rear side of the heat sink, the fastening assembly includes a bolt with one end provided in the mounting groove and a nut provided outside the shell, and the positioning boss is provided with a mounting channel for the bolt to pass through.

[0022] By adopting the above technical solution, since the heat sink itself is symmetrically arranged, the heat sink can be placed upside down when assembled, and the mounting grooves on both sides are compatible with the bolts, and an inverted assembly is adopted. The nut of the bolt is arranged in the mounting groove, and the screw rod is passed through the first connecting hole of the mounting channel and the shell, and the nut is tightened from the outside of the shell, thereby fixing the heat sink and the mounting boss, and it is simpler and more convenient to disassemble and assemble the nut from the outside; a positioning boss is provided, and the positioning boss increases the distance between the heat sink and the shell, further improving the heat dissipation performance and enhancing its safety performance.

[0023] The present invention is further arranged that each group of heat dissipation components includes two positioning bosses, and the two positioning bosses are respectively arranged on the rear sides of the two heat dissipation components and are arranged diagonally.

[0024] By adopting the above technical solution, the heat sinks on both sides are connected into one through a connecting assembly, and only two positioning bosses are required to be set diagonally, which is convenient and quick to assemble and saves costs. At the same time, it is easy to avoid the connection of the first conductive sheet on the rear side when three-in-six-out or six-in-three-out. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a stereogram of embodiment 1 of the present invention.

[0026] Figure 2 This is the front view of the internal structure of Example 1 of the present invention.

[0027] Figure 3 It is a three-dimensional diagram of the internal structure of Example 1 of the present invention.

[0028] Figure 4 The internal structure of the embodiment 1 of the present invention is a partial three-dimensional Figure 1 .

[0029] Figure 5 The internal structure of the embodiment 1 of the present invention is a partial three-dimensional Figure 2 .

[0030] Figure 6 It is a three-dimensional diagram of the internal structure of Example 3 of the present invention.

[0031] Figure 7 It is a partial three-dimensional diagram of the internal structure of Example 3 of the present invention.

[0032] Figure 8 This is a schematic diagram of the internal structure of Example 5 of the present invention.

[0033] Fig. 9 This is a side view of the internal structure of Example 5 of the present invention.

[0034] Meanings of the numbers in the figure: 1. Shell, 11. Machine body, 12. Wiring side plate, 121. Socket, 122. Fan port, 123. Air grille, 13. Insulation plate, 14. Fan, 2. Panel, 3. Heat dissipation assembly, 31. Heat dissipation part, 311. Mounting slide, 4. Thyristor, 5. Fastening assembly, 51. Bolt, 511. Nut, 512. Screw, 52. Nut, 6. Positioning boss, 7. First conductive sheet, 71. First connecting hole, 72. Second connecting hole, 73. First connecting section, 74. Second connecting section, 75. Connecting part, 76. Third connecting hole, 8. Second conductive sheet, 81. Fourth connecting hole, 9. Current detection transformer, 91. Transformer, 10. DC contactor, 101. Third conductive sheet, 102. Fourth conductive sheet. DETAILED DESCRIPTION

[0035] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0036] Reference Figure 1-9 A modularly assembled soft starter comprises a shell 1 and a panel 2, wherein the shell 1 comprises a plurality of heat dissipation components 3, a circuit board and a thyristor 4, wherein the heat dissipation component 3 comprises heat dissipation members 31 which are clamped on both sides of the thyristor 4, wherein the side of the heat dissipation member 31 corresponding to the panel 2 is the front side, and both the front and rear sides of the heat dissipation member 31 are provided with mounting slots 311, wherein at least one end of the mounting slots 311 is open, and the heat dissipation member 31 is connected to a first conductive sheet 7 through a fastening component 5, and the fastening component 5 is slidably arranged in the mounting slots 311, and the first conductive sheet 7 comprises a first connecting section 73 connected to the fastening component 5 and a second connecting section 74 extending out of the shell 1, the first connecting section 73 is provided with a first connecting hole 71, and the second connecting section 74 is provided with a second connecting hole 72, and the shell 1 comprises a body 11 and a wiring side plate 12, wherein the wiring side plate 12 is detachably connected to the body 11, and a socket 121 for the second connecting section 74 to extend is provided on the wiring side plate 12.

[0037] This embodiment is further configured as follows: the mounting groove 311 is configured in an inverted T shape, the front and rear sides of the heat sink 31 are symmetrically configured, the fastening assembly 5 includes a bolt 51, the bolt 51 includes a nut 511 clamped in the mounting groove 311 and a screw 512 adapted to the first connecting hole 71, the screw 512 passes through the first connecting hole 71 and is threadedly connected to a nut 52 configured outside the heat sink 31.

[0038] This embodiment is further configured as follows: the first conductive sheet 7 also includes a connecting portion 75 connecting the first connecting segment 73 and the second connecting segment 74, the first connecting hole 71 is aligned with the mounting slot 311, the center line of the second connecting segment 74 is aligned with the center line of the interval of the heat sink 31 of the same group, and the first connecting segment 73, the second connecting segment 74 and the connecting portion 75 are integrally formed and are at the same height.

[0039] This embodiment further configures: an insulating plate 13 is arranged between the heat dissipation components 3, and an insulating plate 13 is arranged between the body 11 and the heat dissipation components 3.

[0040] This embodiment is further configured as follows: a positioning boss 6 is provided between the rear side of the heat sink 31 and the inner wall of the shell 1; a fastening assembly 5 for connecting the positioning boss 6 and the heat sink 31 is provided in the mounting groove 311 on the rear side of the heat sink 31; the fastening assembly 5 includes a bolt 51 with one end arranged in the mounting groove 311 and a nut 52 arranged outside the shell 1; the positioning boss 6 is provided with a mounting channel for the bolt 51 to pass through.

[0041] The present embodiment is further configured that each heat dissipation assembly 3 includes two positioning bosses 6, and the two positioning bosses 6 are respectively arranged on the rear sides of the two heat dissipation elements 31 and are arranged diagonally.

[0042] Embodiment 1 is a three-input and three-output air supply type online soft starter, the heat dissipation assembly 3 is three groups, the number of the jacks 121 of the wiring side panel 12 at the input end is three, the jacks 121 are arranged at the same height, the wiring side panel 12 at the input end is provided with an air grille 123 at the rear side position corresponding to the heat dissipation element 31, the number of the jacks 121 of the wiring side panel 12 at the output end is three, the jacks 121 are arranged at the same height, the wiring side panel 12 is provided with a fan port 122 at the rear side position corresponding to the heat dissipation element 31, and the fan port 122 is detachably connected to the fan 14.

[0043] Embodiment 2 is a three-input and three-output exhaust type online soft starter, the heat dissipation assembly 3 is three groups, the number of the jacks 121 of the wiring side panel 12 at the input end is three, the jacks 121 are arranged at the same height, the wiring side panel 12 is provided with a fan port 122 at the rear side corresponding to the heat dissipation element 31, the fan port 122 is detachably connected with the fan 14 (reverse installation), the number of the jacks 121 of the wiring side panel 12 at the output end is three, the jacks 121 are arranged at the same height, and the output end wiring side panel 12 is provided with an air grille 123 at the rear side corresponding to the heat dissipation element 31.

[0044] Embodiment 3 is a three-input and six-output external bypass soft starter, in which the heat dissipation assembly 3 is composed of three groups. The number of the jacks 121 of the wiring side panel 12 at the input end is three, and the jacks 121 are arranged at the same height. The wiring side panel 12 at the input end is provided with an air grille 123 at the rear side corresponding to the heat dissipation element 31 (whether a fan 14 is provided depends on customer needs); the number of the jacks 121 of the wiring side panel 12 at the output end is six, and the jacks 121 are arranged in two rows, with three jacks in each row.

[0045] Embodiment 4 is a six-input and three-output external bypass soft starter, in which the heat dissipation assembly 3 is composed of three groups. The number of the jacks 121 of the wiring side panel 12 at the input end is six, and the jacks 121 are arranged in two rows, with three jacks in each row; the number of the jacks 121 of the wiring side panel 12 at the output end is three, and the jacks 121 are arranged at the same height. The wiring side panel 12 at the output end is provided with an air grille 123 at the rear side corresponding to the heat dissipation element 31 (whether a fan 14 is provided depends on customer needs).

[0046] Embodiment 5 is a three-input and three-output built-in bypass soft starter, the two sides of the input end of each group of heat dissipation components 3 are respectively connected to the first conductive sheet 7 and the second conductive sheet 8 through the fastening component 5, the first conductive sheet 7 and the second conductive sheet 8 are provided with a DC contactor 10 on the rear side, the first conductive sheet 7 is provided with a third connection hole 76 for connecting to the DC contactor 10, the third connection hole 76 is provided on the second connection section 74 located in the shell 1, one end of the DC contactor 10 is connected to the first conductive sheet 7 through the third conductive sheet 101, the second conductive sheet 8 is provided with a fourth connection hole 81 for connecting to the DC contactor 10, and the other end of the DC contactor 10 is connected to the second conductive sheet 8 through the fourth conductive sheet 102; the shell 1 is provided with a current detection transformer 9 and a transformer 91 on the side corresponding to the output end of the heat dissipation component 3, the current detection transformer 9 is provided with a mounting through hole adapted to the second connection section 74, and the current detection transformer 9 is sleeved on the second connection section 74 through the mounting through hole.

[0047] In the description of the present invention, it should be noted that the terms "middle", "left", "right", "inside", "outside", "front", "back", "upper", "lower", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. The above-mentioned "between" does not only refer to orientations and positions, but also includes the meaning of the interaction between different parts.

[0048] Although the present invention uses the terms such as housing 1, housing 11, wiring side plate 12, jack 121, fan port 122, air grille 123, insulation plate 13, fan 14, panel 2, heat dissipation assembly 3, heat dissipation element 31, mounting slide 311, thyristor 4, fastening assembly 5, bolt 51, nut 511, screw rod 512, nut 52, positioning boss 6, first conductive sheet 7, first connecting hole 71, second connecting hole 72, first connecting section 73, second connecting section 74, connecting portion 75, third connecting hole 76, second conductive sheet 8, fourth connecting hole 81, current detection transformer 9, transformer 91, DC contactor 10, third conductive sheet 101, fourth conductive sheet 102, etc. more frequently, the possibility of using other terms is not excluded. The use of these terms is only for the purpose of more conveniently describing and explaining the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A modularly assembled soft starter, comprising a housing and a panel, wherein the housing comprises a plurality of heat dissipation components, a circuit board and a thyristor, characterized in that: The heat dissipation assembly includes heat dissipation parts clamped on both sides of the thyristor on the left and right sides, the side of the heat dissipation part corresponding to the panel is the front side, the front and rear sides of the heat dissipation part are both provided with mounting grooves, at least one end of the mounting groove is open, the heat dissipation part is connected to the first conductive sheet through a fastening assembly, the fastening assembly is slidably arranged in the mounting groove, the first conductive sheet includes a first connecting section connected to the fastening assembly and a second connecting section extending out of the shell, the first connecting section is provided with a first connecting hole, and the second connecting section is provided with a second connecting hole, the shell includes a body and a wiring side plate, the wiring side plate is detachably connected to the body, and the wiring side plate is provided with a jack for the second connecting section to extend out.

2. A modularly assembled soft starter according to claim 1, characterized in that: The mounting groove is in an inverted T-shape and is symmetrically arranged on the front and rear sides of the heat sink. The fastening assembly includes a bolt, which includes a nut clamped in the mounting groove and a screw rod adapted to the first connecting hole. The screw rod passes through the first connecting hole and is threadedly connected to a nut arranged outside the heat sink.

3. A modularly assembled soft starter according to claim 1, characterized in that: The first conductive sheet also includes a connecting portion connecting the first connecting section and the second connecting section, the first connecting hole is aligned with the mounting slot, the center line of the second connecting section is aligned with the center line of the interval of the same group of heat sinks, and the first connecting section, the second connecting section and the connecting portion are integrally formed and at the same height.

4. A modularly assembled soft starter according to claim 3, characterized in that: The heat dissipation components are divided into three groups, the number of the sockets on the wiring side panel is three, the sockets are arranged at the same height, the wiring side panel is provided with a fan port or an air grille at a position corresponding to the rear side of the heat dissipation component, and the fan port is detachably connected to a fan.

5. A modularly assembled soft starter according to claim 3, characterized in that: The heat dissipation components are in three groups, the wiring side panel has six jacks, and the jacks are arranged in two rows, three in each row.

6. A modularly assembled soft starter according to claim 1, characterized in that: An insulating plate is arranged between the heat dissipation components, and an insulating plate is arranged between the machine body and the heat dissipation components.

7. A modularly assembled soft starter according to claim 1, characterized in that: Both sides of the input end of each group of heat dissipation components are respectively connected to the first conductive sheet and the second conductive sheet through fastening components, a DC contactor is arranged on the rear sides of the first conductive sheet and the second conductive sheet, the first conductive sheet is provided with a third connecting hole for connecting to the DC contactor, the third connecting hole is arranged on the second connecting section located in the shell, one end of the DC contactor is connected to the first conductive sheet through the third conductive sheet, the second conductive sheet is provided with a fourth connecting hole for connecting to the DC contactor, and the other end of the DC contactor is connected to the second conductive sheet through the fourth conductive sheet.

8. A modularly assembled soft starter according to claim 1, characterized in that: A current detection mutual inductor and a transformer are arranged on one side of the shell corresponding to the output end of the heat dissipation assembly. The current detection mutual inductor is provided with a mounting through hole adapted to the second connecting section. The current detection mutual inductor is sleeved on the second connecting section through the mounting through hole.

9. A modularly assembled soft starter according to claim 1, characterized in that: A positioning boss is arranged between the rear side of the heat sink and the inner wall of the shell, and a fastening assembly for connecting the positioning boss and the heat sink is arranged in the mounting groove on the rear side of the heat sink. The fastening assembly includes a bolt with one end arranged in the mounting groove and a nut arranged outside the shell, and the positioning boss is provided with a mounting channel for the bolt to pass through.

10. A modularly assembled soft starter according to claim 1, characterized in that: Each heat dissipation assembly includes two positioning bosses, which are respectively arranged on the rear sides of the two heat dissipation elements and are arranged diagonally.

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