floor-mounted contactor

Abstract

This utility model relates to the field of electrical equipment technology, specifically to a floor-mounted contactor. It includes a stationary contact device and a moving contact device with a moving contact assembly and a chassis. The chassis includes: a crossbeam body; a frame capable of moving relative to the crossbeam body towards the stationary contact device, with the moving contact assembly connected to the frame; and a lead screw mechanism including a lead screw and a nut cooperating with it. The lead screw is located within the frame and extends beyond the crossbeam body, while the nut is connected to the frame. The frame and the moving contact assembly move towards the stationary contact device in response to the rotation of the lead screw, thus electrically connecting the moving contact assembly to the stationary contact device. In this utility model, by optimizing the chassis drive method to lead screw mechanism drive, the defects of existing worm gear drive methods are effectively solved, significantly improving the ease of operation and smoothness of the device, and providing a strong guarantee for the reliable operation of the moving contact device.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, specifically to a floor-mounted contactor. Background Technology

[0002] In power systems, switchgear, as a core electrical control and protection device, is widely used in key areas such as industrial power distribution, energy supply, and infrastructure projects. Its operational stability directly affects the safety and reliability of the power network. Contactors are key actuators within switchgear that control the on / off states of circuits. They are responsible for remotely operating loads such as motors and electric heating equipment. Due to the structural characteristics and maintenance requirements of switchgear, contactors often adopt a modular design that allows for easy operation and maintenance. Ease of operation and operational safety are important indicators for evaluating switchgear performance.

[0003] In the current market for existing power equipment, a large number of floor-mounted contactors that have been in operation for over twenty years are still serving beyond their service life. These products have been phased out of the market for many years due to technological advancements, and their long-term operation has revealed numerous problems:

[0004] First, the failure of the operating mechanism led to a decrease in reliability. The original mechanism used a worm gear drive design, which was not only complex in structure but also had low transmission efficiency. It required a large driving force during operation, often necessitating two people working together to complete the daily cranking in and out operations, resulting in poor ease of operation. After long-term and frequent use, the transmission components gradually showed severe wear and deformation, and the aging and failure of the lubricating grease further exacerbated the operating resistance.

[0005] Secondly, the closing circuit lacks a control mechanism that is linked to the rocking-in and rocking-out action, and lacks a safety design of "forced locking during operation". This results in the risk of accidental closing when the contactor has not completed the mechanical action of rocking-in and rocking-out and the moving and stationary contacts are in a state of partial contact or alignment deviation.

[0006] Third, existing propulsion frames mostly adopt bolt splicing or segmented welding assembly methods. Although these methods can achieve the initial fixation of components, they are prone to defects such as dimensional deviations and structural deformations due to problems such as splicing gaps, loose bolts, or stress concentration in segmented welds during long-term use or when bearing loads. This not only affects the alignment accuracy of key components, but may also cause safety hazards due to insufficient structural strength.

[0007] In summary, the aging, decommissioned floor-mounted contactors in the existing market can no longer meet the current power system's requirements for safe, reliable, and efficient operation. Furthermore, the market lacks comprehensive replacement products that can achieve size adaptation, functional compatibility, and performance upgrades for these contactors. Therefore, developing new, replaceable products to address issues such as insulation aging, operational jamming, and missing parts is of significant practical importance for ensuring power system stability, reducing enterprise maintenance costs, and promoting the technological upgrading of existing equipment. Utility Model Content

[0008] Therefore, the purpose of this utility model is to provide a floor-mounted contactor to solve at least some of the above-mentioned problems.

[0009] This utility model provides a floor-mounted contactor, a stationary contact device, and a moving contact device having a chassis and a moving contact assembly. The chassis includes: a crossbeam body; a frame, the frame being movable relative to the crossbeam body toward the stationary contact device, and the moving contact assembly being connected to the frame; a lead screw mechanism, the lead screw mechanism including a lead screw and a nut cooperating with the lead screw, the lead screw being located inside the frame and extending outside the crossbeam body, and the nut being connected to the frame; the frame and the moving contact assembly move toward the stationary contact device in response to the rotation of the lead screw, thereby electrically connecting the moving contact assembly to the stationary contact device.

[0010] In one embodiment, the vehicle also includes a cabinet for accommodating the stationary contact device, the cabinet including a limiting block with a groove, and the chassis also including a tongue plate that is horizontally movable relative to the crossbeam body. After the tongue plate is inserted into the groove, the frame and the moving contact assembly are movable relative to the crossbeam body toward the stationary contact device.

[0011] In one embodiment, the device further includes a handle comprising a pressure plate and a drive unit rotatable relative to the pressure plate for driving the lead screw to rotate; a normally closed switch connected to the closing circuit of the floor-mounted contactor and connected to the crossbeam body; the crossbeam body having a positioning part and a rotating member, wherein the rotating member rotates after the pressure plate interacts with the positioning post, and the normally closed switch cuts off the closing circuit in response to the rotation of the rotating member.

[0012] In one embodiment, the pressure plate includes a flat plate portion and an inclined portion extending obliquely from the flat plate portion. The rotating member includes a rotating plate and a bent plate located on opposite sides of the crossbeam body and connected by a rotating shaft. The bent plate and the normally closed switch are located on the side of the crossbeam body closer to the frame. After the pressure plate interacts with the positioning portion, the inclined portion causes the rotating plate to rotate, which in turn causes the bent plate to rotate. The normally closed switch cuts off the closing circuit in response to the rotation of the bent plate.

[0013] In one embodiment, a reset member connected to the bent plate is further included, the reset member resetting the rotating member in response to the removal of the handle, and the normally closed switch closing in response to the resetting of the rotating member, thereby connecting the closing circuit.

[0014] In one embodiment, the moving contact assembly includes three sets of sequentially electrically connected components: a first connector, a first copper busbar, a fuse, a second copper busbar, a vacuum bulb, a third copper busbar, and a second connector. The first connector and the second connector are connected to the stationary contact device to connect the main electrical circuit of the floor-mounted contactor.

[0015] In one embodiment, a portion of the outer surfaces of the first copper busbar, the second copper busbar, and the third copper busbar are covered with an insulating layer.

[0016] In one embodiment, the insulating layer is a heat-shrink tubing or epoxy resin.

[0017] In one embodiment, the moving contact assembly further includes a normally open switch in the tripping circuit and three sets of rocker arms connected to the fuse tube cover of the fuse. The three sets of rocker arms are connected to the same rotating shaft. After the fuse blows, the fuse pin extends out of the fuse tube cover. In response to the extension of the pin, the three sets of rocker arms and the rotating shaft rotate around the axis of the rotating shaft. The normally open switch closes in response to the rotation of the rotating shaft, thereby connecting the tripping circuit.

[0018] In one embodiment, the moving contact device further includes a frame that is at least partially welded together, through which the moving contact assembly is connected to the vehicle frame.

[0019] In this invention, by optimizing the chassis vehicle's drive method to a lead screw mechanism drive, the shortcomings of existing worm gear drive methods are effectively solved, significantly improving the ease of operation and smoothness of the device. The lead screw mechanism drive system allows for direct power input by rotating the operating handle at the end of the lead screw mechanism. No additional special tools are required during operation, and workers can easily control the chassis vehicle's movement manually, greatly shortening operation time and improving work efficiency. This solves the problems of complex operation and movement jamming associated with existing drive methods, providing a strong guarantee for the reliable operation of the moving contact device. Attached Figure Description

[0020] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings, wherein:

[0021] Figure 1 This is a schematic diagram of the working contact device and the cabinet in this utility model;

[0022] Figure 2 This is a schematic diagram of one angle of the moving contact device in this utility model;

[0023] Figure 3 Hidden Figure 2 The structure of the moving contact device in the middle section is shown in the schematic diagram of the moving contact assembly;

[0024] Figure 4 This is a schematic diagram of the moving contact device in this utility model from another angle;

[0025] Figure 5 Hidden Figure 4 The structure of the moving contact device in the middle section is shown in the schematic diagram of the moving contact assembly;

[0026] Figure 6 This is a schematic diagram of one embodiment of the chassis vehicle in this utility model;

[0027] Figure 7 This is a schematic diagram of another embodiment of the chassis vehicle in this utility model from one angle;

[0028] Figure 8 yes Figure 7 Enlarged view of point I in the middle;

[0029] Figure 9 This is a schematic diagram from another angle illustrating another embodiment of the chassis vehicle in this utility model;

[0030] Figure 10 yes Figure 9 Enlarged schematic diagram at point II;

[0031] Figure 11 This is a schematic diagram of the limiting block in this utility model.

[0032] Explanation of reference numerals in the attached figures

[0033] 10-Cabinet; 11-Limiting block; 111-Groove; 20-Moving contact device; 201-Frame; 21-Moving contact assembly; 211-First connector; 212-First copper busbar; 213-Fuse; 214-Second copper busbar; 215-Vacuum bulb; 216-Third copper busbar; 217-Second connector; 218-Normally open switch; 219-Swing rod; 220-Rotating shaft; 22-Chassis; 222-Frame; 223-Crossbeam body; 224-Tongue plate; 225-Normally closed switch; 226-Bend plate; 227-Positioning part; 228-Rotating component; 229-Rotating plate; 230-Screw mechanism; 30-Handle; 31-Pressure plate; 311-Flat plate part; 312-Inclined part; 32-Drive part. Detailed Implementation

[0034] The present invention will be further described in detail below with reference to specific embodiments. The embodiments given are only for illustrating the present invention and are not intended to limit the scope of the present invention.

[0035] The schematic solutions of the technical solutions disclosed in this utility model are now described in detail with reference to the accompanying drawings. Although the drawings are provided to illustrate some embodiments of this utility model, the drawings are not necessarily drawn to the dimensions of the specific embodiments, and certain features may be enlarged, removed, or partially cut to better illustrate and explain the disclosure of this utility model. Some components in the drawings may be repositioned according to actual needs without affecting the technical effect. The phrase "in the drawings" or similar terms appearing in the specification do not necessarily refer to all drawings or examples.

[0036] Certain directional terms used in the description of the accompanying drawings below, such as “inner,” “outer,” “above,” “below,” and other directional terms, will be understood to have their normal meaning and refer to those directions as normally viewed in the accompanying drawings. Unless otherwise specified, the directional terms used in this specification are generally in accordance with the conventional directions understood by those skilled in the art.

[0037] The terms “first,” “first,” “second,” “second,” and similar terms used in this utility model do not indicate any order, quantity, or importance, but are used to distinguish one component from other components.

[0038] Figure 1 This illustrates the connection relationship between the moving contact device 20 and the cabinet 10 in this utility model; Figure 2 This is a schematic diagram of one angle of the moving contact device 20; Figure 3 Hidden Figure 2 The door panel of the middle frame 201 is shown to illustrate the structure of the moving contact assembly 21 in more detail; Figure 4 This is a schematic diagram of the moving contact device 20 from another angle; Figure 5 Hidden Figure 4 The partition and part of the moving contact assembly 21 structure are shown to illustrate some of the electrical components constituting the moving contact assembly 21; Figure 6 This is a schematic diagram of one embodiment of the chassis vehicle 22 in this utility model; Figure 7 This is a schematic diagram of another embodiment of the chassis vehicle 22 in this utility model from one angle; Figure 8 yes Figure 7 The enlarged schematic diagram at point I shows the normally closed switch 225 and the bent plate 226 in the rotating component 228; Figure 9 yes Figure 7 A schematic diagram of the chassis vehicle 22 from another angle; Figure 10 yes Figure 9 The enlarged schematic diagram at point II shows the composition of the handle 30 and the rotating plate 229 in the rotating component 228.

[0039] In this invention, the floor-mounted contactor typically includes a fixed cabinet 10 for housing a stationary contact device and a movable contact device 20 that is movable relative to the cabinet 10. The movable contact device 20 has an idle state, a test state, and an operating state. In the idle state, the movable contact device 20 is located outside the cabinet 10 and is in contact with the ground via four wheels at the bottom. In the test state, the movable contact device 20 is located inside the cabinet 10, and the movable contact assembly 21 is in contact with a guide rail at the bottom of the cabinet 10 via four wheels located on the bottom side and can move along the guide rail toward the stationary contact device. In the operating state, the movable contact device 20 moves until the first connector 211 and the second connector 217 described below are connected to the stationary contact device, thereby connecting the main electrical circuit of the floor-mounted contactor.

[0040] Combination Figures 1 to 6 In this invention, the moving contact device 20 includes a moving contact assembly 21 and a chassis 22. The chassis 22 includes a crossbeam body 223, a frame 222, and a lead screw mechanism 230. The frame 222 is movable relative to the crossbeam body 223 towards the stationary contact device. The moving contact assembly 21 is connected to the frame 222 via a frame 201. The lead screw mechanism 230 includes a lead screw and a nut that engages with the lead screw. The lead screw is located within the frame 222 and extends outside the crossbeam body 223, while the nut is located within the frame 222. The frame 222, frame 201, and moving contact assembly 21 move towards the stationary contact device in response to the rotation of the lead screw, thus electrically connecting the moving contact assembly 21 to the stationary contact device. The portion of the lead screw outside the crossbeam body 223 can be a column with four sides, and the handle 30 described below engages with this column to drive the lead screw to rotate.

[0041] In this invention, by optimizing the drive method of the chassis 22 to a lead screw mechanism 230, the defects of the existing worm gear drive method are effectively solved, significantly improving the ease of operation and smoothness of the device. The lead screw mechanism 230 drive system can directly input power by rotating the operating handle at the end of the lead screw mechanism. No additional special tools are required during operation. Operators can easily control the movement of the chassis 22 manually, which can greatly shorten the operation time, improve work efficiency, and solve the problems of complex operation and movement jamming in the existing drive method, providing a strong guarantee for the reliable operation of the moving contact device 20.

[0042] Furthermore, at least a portion of the frame 201 in this invention is manufactured using an integral welding process. This integrated welding design overcomes the shortcomings of traditional assembled frames, while simultaneously improving both dimensional accuracy and structural strength. Compared to existing technologies, the relatively high precision and strength of the frame 201 ensures the alignment and safety of the moving contact assembly 21 during operation, thus providing a reliable structural guarantee for the stable operation of the entire moving contact device 20.

[0043] Combination Figure 1 , Figure 6 as well as Figure 11 In a preferred embodiment, the floor-mounted contactor may include a cabinet 10 with a limiting block 11, the limiting block 11 having a groove 111. The chassis 22 also includes a tongue 224 that can move horizontally relative to the crossbeam body 223. After the tongue 224 is inserted into the groove 111, the frame 222, the frame 201, and the moving contact assembly 21 can move relative to the crossbeam body 223 toward the stationary contact device. Specifically, in the test position, the tongue 224 is inserted into the groove 111, and then the screw can be rotated by rotating the handle 30, thereby causing the frame 201 and the moving contact assembly 21 to move toward the stationary contact device.

[0044] The cabinet 10 in this invention can fully utilize existing cabinets without requiring destructive modifications to the cabinet body. The installation of the limiting block 11 can be completed using only conventional fasteners such as bolts. From a construction safety perspective, this installation method eliminates the need for busbar power outages: the installation location of the limiting block 11 avoids the high-voltage electrical area inside the cabinet, and bolt tightening can be completed only outside the cabinet 10 or in a non-energized area, avoiding the risk of contact between construction personnel and live parts. It also eliminates safety hazards such as circuit abnormalities and equipment restart failures that may occur due to power outages, significantly improving on-site construction safety. Furthermore, the bolt installation process eliminates the need for welding, cutting, or other operations that generate high-temperature sparks; installation is completed simply by tightening the bolts with tools such as wrenches, eliminating the risk of fire and explosion caused by sparks and improving the environmental adaptability and safety factor of on-site construction.

[0045] In one embodiment of the chassis 22, the lead screw is driven by a handle 30, which includes a pressure plate 31 and a drive unit 32 rotatable relative to the pressure plate 31 for driving the lead screw to rotate. Figures 7 to 10To prevent the moving contact device 20 from closing during the rocking-in and rocking-out process, in a preferred embodiment of this utility model, the closing circuit of the floor-mounted contactor includes a normally closed switch 225 connected to the crossbeam body 223. The crossbeam body 223 has a positioning part 227 and a rotating part 228. After the pressure plate 31 interacts with the positioning part 227, the rotating part 228 rotates, and the normally closed switch 225 responds to the rotation of the rotating part 228 by cutting off the closing circuit.

[0046] Furthermore, referring to Figure 8 and Figure 10 The pressure plate 31 includes a flat plate portion 311 and an inclined portion 312 extending inclinedly from the flat plate portion 311. The rotating member 228 includes a rotating plate 229 and a bent plate 226 located on opposite sides of the crossbeam body 223 and connected by a rotating shaft. The bent plate 226 and the normally closed switch 225 are located on the side of the crossbeam body 223 closer to the frame 222, and the rotating plate 229 is located on the side of the crossbeam body 223 away from the frame 222. After the pressure plate 31 interacts with the positioning portion 227, the inclined portion 312 causes the rotating plate 229 to rotate, which in turn causes the bent plate 226 to rotate. The normally closed switch 225 responds to the rotation of the bent plate 226 and cuts off the closing circuit, thereby preventing the closing action from occurring during the swing-in and swing-out process.

[0047] It is understood that the positioning part 227 can be a positioning hole, and a post for insertion into the positioning hole can be formed on the flat plate part 311. Alternatively, the positioning part 227 can also be a positioning post, and a hole for fitting onto the positioning post can be formed on the flat plate part 311. (See also...) Figure 10 The rotating plate 229 may include a first plate-shaped portion for fixing to the crossbeam body 223 and a second plate-shaped portion extending from the first plate-shaped portion in a direction away from the crossbeam body 223. The inclined portion 312 causes the rotating plate 229 to rotate via the second plate-shaped portion. (Refer to the attached drawing.) Figure 8 The bending plate 226 has a third plate-shaped portion for fixing to the beam body 223 and a fourth plate-shaped portion extending from the third plate-shaped portion away from the beam body 223. The bending plate 226 causes the normally closed switch 225 to open through the fourth plate-shaped portion, thereby cutting off the closing circuit of the floor contactor.

[0048] Furthermore, a reset member connected to the bending plate 226 can be installed on the main body 223 of the crossbeam. The reset member resets the rotating member 228 in response to the removal of the handle 30, and the normally closed switch 225 closes in response to the reset of the rotating member 228, thereby connecting the closing circuit. In a preferred embodiment, the reset member can be a tension spring.

[0049] like Figures 3 to 5As shown, the moving contact assembly 21 includes three sets of components that are electrically connected in sequence: a first connector 211, a first copper busbar 212, a fuse 213, a second copper busbar 214, a vacuum bulb 215, a third copper busbar 216, and a second connector 217. The first connector 211 and the second connector 217 are connected to the stationary contact device to connect the main electrical circuit of the floor-mounted contactor. The three sets of electrical components are respectively connected to the A, B, and C three-phase contacts of the stationary contact device. In a preferred embodiment, the first copper busbar 212, the second copper busbar 214, and the third copper busbar 216 can be manufactured by bending or vertical bending. Compared with the existing product where multiple straight copper busbars are connected by bolts, this reduces the number of connection points of the copper busbars, optimizes the resistance and heating characteristics, and is suitable for high-load, long-term continuous operation industrial scenarios, laying the foundation for the reliable operation of the contactor. It is understood that, for the convenience of copper busbar manufacturing and assembly, the number of the first copper busbar 212, the second copper busbar 214, and the third copper busbar 216 can be one or more.

[0050] In addition, to ensure the insulation of the copper busbars, portions of the outer surfaces of the first copper busbar 212, the second copper busbar 214, and the third copper busbar 216 are covered with an insulating layer. This insulating layer can be any suitable material; in a preferred embodiment, it can be heat-shrink tubing or epoxy resin.

[0051] Reference Figure 5 The moving contact assembly 21 also includes a normally open switch 218 in the trip circuit and three sets of rocker arms 219 connected to the fuse tube cover of the fuse 213. The three sets of rocker arms 219 are connected to the same rotating shaft 220. After the fuse 213 blows, the pin of the fuse 213 extends out from the fuse tube cover. In response to the extension of the pin, the three sets of rocker arms 219 and the rotating shaft 220 rotate around the axis of the rotating shaft 220. The normally open switch 218 closes in response to the rotation of the rotating shaft 220 and connects the trip circuit.

[0052] By connecting three sets of levers 219 to the same rotating shaft 220, mechanical linkage of the three fuse states is achieved. Whenever any fuse 213 blows, its ejector pin will move, causing the entire rotating shaft 220 to rotate via the corresponding lever 219. This ensures a high degree of synchronization and consistency in the mechanism's movements, avoiding malfunctions caused by uncoordinated actions of individual components.

[0053] It should be understood that although this specification describes various embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0054] The above description is merely an illustrative embodiment of this utility model and is not intended to limit the scope of this utility model. Any equivalent changes, modifications, and combinations made by those skilled in the art without departing from the concept and principles of this utility model should fall within the protection scope of this utility model.

Claims

1. A floor standing contactor characterized by, include: A stationary contact device and a moving contact device (20) having a moving contact assembly (21) and a chassis (22), wherein the chassis (22) includes: The main body of the crossbeam (223); A frame (222) is movable relative to the crossbeam body (223) toward the stationary contact device, and the moving contact assembly (21) is connected to the frame (222); A lead screw mechanism (230) includes a lead screw and a nut that engages with the lead screw. The lead screw is located inside the frame (222) and extends outside the crossbeam body (223). The nut is connected to the frame (222). The frame (222) and the moving contact assembly (21) move toward the stationary contact device in response to the rotation of the lead screw, thereby electrically connecting the moving contact assembly (21) with the stationary contact device.

2. The drop-in contactor of claim 1, wherein, It also includes a cabinet (10) for accommodating the stationary contact device, the cabinet (10) including a limiting block (11) with a groove (111), the chassis (22) also including a tongue plate (224) movable in a horizontal direction relative to the crossbeam body (223), after the tongue plate (224) is inserted into the groove (111), the frame (222) and the moving contact assembly (21) are movable relative to the crossbeam body (223) toward the stationary contact device.

3. The drop-in contactor of claim 2, wherein, Also includes The handle (30) includes a pressure plate (31) and a drive unit (32) rotatable relative to the pressure plate (31) for driving the lead screw to rotate. A normally closed switch (225) is connected to the closing circuit of the floor contactor and to the main body of the beam (223); The main body of the crossbeam (223) has a positioning part (227) and a rotating part (228). After the pressure plate (31) interacts with the positioning part (227), the rotating part (228) rotates. The normally closed switch (225) cuts off the closing circuit in response to the rotation of the rotating part (228).

4. The drop-in contactor of claim 3, wherein, The pressure plate (31) includes a flat plate (311) and an inclined portion (312) extending obliquely from the flat plate (311). The rotating member (228) includes a rotating plate (229) and a bent plate (226) located on opposite sides of the crossbeam body (223) and connected by a rotating shaft. The bent plate (226) and the normally closed switch (225) are located on the side of the crossbeam body (223) closer to the frame (222). After the pressure plate (31) interacts with the positioning portion (227), the inclined portion (312) causes the rotating plate (229) to rotate, and then the bent plate (226) rotates. The normally closed switch (225) cuts off the closing circuit in response to the rotation of the bent plate (226).

5. The floor-mounted contactor according to claim 4, characterized in that, It also includes a reset member connected to the bent plate (226), which resets the rotating member (228) in response to the removal of the handle (30), and the normally closed switch (225) closes in response to the reset of the rotating member (228), thereby connecting the closing circuit.

6. The floor-mounted contactor according to claim 1, characterized in that, The moving contact assembly (21) includes three sets of first connectors (211), first copper busbars (212), fuses (213), second copper busbars (214), vacuum bulbs (215), third copper busbars (216), and second connectors (217) that are electrically connected in sequence. The first connectors (211) and the second connectors (217) are connected to the stationary contact device to connect the main electrical circuit of the floor contactor.

7. The floor-mounted contactor according to claim 6, characterized in that, Parts of the outer surfaces of the first copper busbar (212), the second copper busbar (214), and the third copper busbar (216) are covered with an insulating layer.

8. The floor-mounted contactor according to claim 7, characterized in that, The insulating layer is heat shrink tubing or epoxy resin.

9. The floor-mounted contactor according to claim 6, characterized in that, The moving contact assembly (21) also includes a normally open switch (218) in the trip circuit and three sets of rocker arms (219) connected to the fuse tube cover of the fuse (213). The three sets of rocker arms (219) are connected to the same rotating shaft (220). After the fuse (213) blows, the pin of the fuse (213) extends out from the fuse tube cover. In response to the extension of the pin, the three sets of rocker arms (219) and the rotating shaft (220) rotate around the axis of the rotating shaft (220). The normally open switch (218) closes in response to the rotation of the rotating shaft (220) and connects the trip circuit.

10. The floor-mounted contactor according to claim 1, characterized in that, The moving contact device (20) also includes a frame (201) that is at least partially welded together, through which the moving contact assembly (21) is connected to the frame (222).

Images