Anti-short-circuit assembly and direct current contactor

Abstract

The embodiment of the utility model provides a kind of anti short-circuit assembly and DC contactor, it is related to contactor technical field.The anti short-circuit assembly includes base, support, movable contact bridge, elastic member and lower magnetic conductor, support is connected with base;Movable contact bridge is located in the space formed by base and support enclosure;Elastic member is between base and movable contact bridge;Lower magnetic conductor is provided with at least one gap, and the gap is used to accommodate support.Through the gap being set on lower magnetic conductor, the support force of the lower magnetic conductor to movable contact bridge is more uniform under the premise of keeping the area of lower magnetic conductor pole shoe substantially unchanged, and the anti short-circuit stability is improved.

Description

Technical Field

[0001] This utility model relates to the field of contactor technology, and more specifically, to a short-circuit protection component and a DC contactor. Background Technology

[0002] A DC contactor (hereinafter referred to as a contactor) is an electronically controlled component. It uses the magnetic field generated by energizing an electromagnetic coil to drive an internal push rod assembly, thereby closing the moving contact bridge and stationary contacts to control the circuit. One existing DC contactor employs a direct-acting magnetic circuit structure. Two stationary contact leads (i.e., two load leads) are mounted on the housing. The bottom ends of the two stationary contact leads have stationary contacts. Inside the housing are a moving contact bridge and a push rod assembly. The moving contact bridge is spring-loaded into the push rod assembly, which is connected to the direct-acting magnetic circuit. Under the action of the direct-acting magnetic circuit, the push rod assembly moves the moving contact bridge upwards, causing the moving contacts at both ends of the moving contact bridge to contact the stationary contacts at the bottom ends of the two stationary contact leads, thus connecting the load.

[0003] However, when existing DC contactors need to be designed to be smaller in size, the distance between the stationary contacts will become smaller, the width of the lower conductor magnet will decrease, and the supporting force on the moving contact bridge may be uneven, resulting in a decrease in its short-circuit resistance stability. Utility Model Content

[0004] This invention provides a short-circuit protection component and a DC contactor, which can make the supporting force of the lower magnetic material on the moving contact bridge more uniform while keeping the pole shoe area of ​​the upper and lower magnetic materials unchanged, thereby improving the short-circuit protection stability.

[0005] The embodiments of this utility model can be implemented as follows: An embodiment of this utility model provides a short-circuit protection component, which includes: Base; The bracket is connected to the base; A movable contact bridge, wherein the movable contact bridge is located in the space formed by the base and the bracket; An elastic element is located between the base and the movable contact bridge; The lower magnetic conductor has at least one notch for accommodating the bracket.

[0006] In an optional embodiment, the lower magnetic conductor is U-shaped and includes a first sidewall, a bottom plate, and a second sidewall connected in sequence. The notch includes a first notch and a second notch. The first sidewall has a first notch that extends through the axial direction, dividing the first sidewall into a first magnetic branch and a second magnetic branch. The second sidewall has a second notch that extends through the axial direction, dividing the second sidewall into a third magnetic branch and a fourth magnetic branch.

[0007] In an optional implementation, the first notch and the second notch are symmetrically arranged.

[0008] In an optional embodiment, a protrusion is formed on the side of the bottom plate of the lower magnetic conductor away from the moving contact bridge, and one end of the elastic member is sleeved on the protrusion and abuts against the lower magnetic conductor.

[0009] In an optional embodiment, the short-circuit protection assembly further includes a push rod mechanism, which includes a mounting plate, a push rod, a sleeve, and a moving iron core. The push rod passes through the mounting plate, and one end of the push rod is connected to the base. The sleeve is connected to the mounting plate, and the moving iron core is housed within the sleeve. The push rod passes through the moving iron core. The moving iron core is used to push the push rod to move when excited, thereby causing the base and the moving contact bridge to move relative to the mounting plate.

[0010] In an optional embodiment, the short-circuit protection assembly further includes an insulating support connected to the mounting plate. In an optional embodiment, a limiting groove is provided on the insulating bracket, and a limiting plate is provided on the base. The limiting plate cooperates with the limiting groove, and the limiting groove is used to constrain the movement trajectory of the push rod mechanism driving the base.

[0011] In an optional embodiment, the short-circuit protection component further includes an upper magnetic conductor fixed to the insulating support, and the upper magnetic conductor and the lower magnetic conductor are disposed opposite to each other. In an optional embodiment, the short-circuit protection component further includes a clamping member, and the top of the insulating bracket is provided with a mounting groove, and the upper magnetic conductor is disposed in the mounting groove; the clamping member is disposed on the upper magnetic conductor, and the clamping member is used to clamp the insulating bracket.

[0012] An embodiment of this utility model also provides a DC contactor, including a housing and the short-circuit protection component described in any of the above embodiments, wherein a stationary contact is provided on the top of the housing, and the short-circuit protection component is disposed inside the housing.

[0013] The beneficial effects of the short-circuit protection component and DC contactor of this utility model embodiment include, for example: The short-circuit protection assembly includes a base, a support, a moving contact bridge, an elastic element, and a lower magnetic conductor. The support is connected to the base; the moving contact bridge is located in the space enclosed by the base and the support; after the support is connected to the base, it forms a "cage-like" or "frame-like" structure. The elastic element is located between the base and the moving contact bridge; the lower magnetic conductor has at least one notch to accommodate the support. By creating a notch in the lower magnetic conductor, the supporting force of the lower magnetic conductor on the moving contact bridge can be more uniform while keeping the pole piece area of ​​the lower magnetic conductor essentially unchanged, thus improving short-circuit protection stability. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of a DC contactor provided in an embodiment of the present invention; Figure 2 This is an exploded view of the DC contactor provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the AA cross-section provided in an embodiment of this utility model; Figure 4 This is a schematic diagram of the short-circuit protection component provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the lower magnetic conductor from a first-view perspective provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the lower magnetic conductor from a second perspective provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the insulating bracket provided in an embodiment of the present invention.

[0016] Icons: 1000-DC contactor; 100-short-circuit protection assembly; 110-base; 111-limiting plate; 120-bracket; 121-first fixed wall; 122-second fixed wall; 123-connecting top plate; 130-lower magnetic conductor; 131-notch; 1311-first notch; 1312-second notch; 132-first side wall; 1321-first magnetic branch; 1322-second magnetic branch; 133-base plate; 1331- 1332 - Protruding post; 134 - Clearance groove; 1341 - Second sidewall; 1341 - Third magnetic branch; 1342 - Fourth magnetic branch; 140 - Elastic element; 150 - Moving contact bridge; 160 - Push rod mechanism; 161 - Mounting plate; 162 - Push rod; 163 - Sleeve; 164 - Moving iron core; 170 - Insulating bracket; 171 - Limiting groove; 172 - Mounting groove; 180 - Upper magnetic conductor; 190 - Clamping element; 200 - Housing; 300 - Stationary contact. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0019] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0020] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0022] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0023] A DC contactor (hereinafter referred to as a contactor) is an electronically controlled component. It uses the magnetic field generated by energizing an electromagnetic coil to drive an internal push rod assembly, thereby closing the moving contact bridge and the stationary contact to control the circuit. Most push rod assemblies include a base and a movable component. The movable component is movable relative to the base, allowing the base to continue moving even after the movable component contacts the stationary contact, providing overtravel for the movable component and ensuring contact reliability. Additionally, to improve the contactor's short-circuit withstand capability, the push rod assembly may also include an upper magnetic conductor and a lower magnetic conductor.

[0024] One existing DC contactor uses a direct-acting magnetic circuit structure. Two stationary contact leads (i.e., two load leads) are mounted on the housing. The bottom of each stationary contact lead has a stationary contact. Inside the housing are a moving contact bridge and a push rod assembly. The moving contact bridge is spring-loaded into the push rod assembly, which is connected to the direct-acting magnetic circuit. Under the action of the direct-acting magnetic circuit, the push rod assembly moves the moving contact bridge upwards, causing the moving contacts at both ends of the moving contact bridge to contact the stationary contacts at the bottom of the two stationary contact leads, thus connecting the load. However, when the existing DC contactor needs to be designed to be small, the distance between the stationary contacts becomes smaller, and the width of the lower conductor magnet decreases. This may result in uneven support force on the moving contact bridge, leading to poorer short-circuit withstand stability.

[0025] Based on this, please refer to Figures 1 to 4 The short-circuit protection component 100 provided in the embodiments of this utility model can effectively improve the aforementioned technical problems. This short-circuit protection component 100 can make the supporting force of the lower magnetic conductor 130 on the moving contact bridge 150 more uniform while keeping the pole shoe area of ​​the upper and lower magnetic conductors 130 unchanged, thereby improving short-circuit protection stability. The lower magnetic conductor 130 is applied in a DC contactor 1000, which can be used in electrical systems. Both the equipment and the electrical system with the lower magnetic conductor 130 have the same functions as described above, and will not be elaborated further here.

[0026] The power system in this embodiment includes a DC contactor 1000. The power system can be a photovoltaic power generation system, an energy storage system, an electric vehicle charging system, a power distribution system, a power supply system, etc., which will not be described in detail here.

[0027] Figure 1 This is a schematic diagram of the DC contactor 1000 provided in an embodiment of the present utility model; Figure 2This is an exploded view of the DC contactor 1000 provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the AA cross-section provided in an embodiment of this utility model; Figure 4 This is a schematic diagram of the push rod 162 assembly that drives the contact bridge 150 provided in an embodiment of the present invention.

[0028] Please see Figures 1-4 In this embodiment, the DC contactor 1000 includes a housing 200 and a short-circuit protection component 100. A stationary contact 300 is disposed on the top of the housing 200, and the short-circuit protection component 100 is disposed within the housing 200. The stationary contact 300 is used for electrical connection with an external power supply and electrical equipment, respectively. Of course, the DC contactor 1000 may also include other structural components depending on the specific application scenario, which is not limited here.

[0029] The following is a detailed description of the anti-short-circuit component 100.

[0030] Please see Figures 2-4 In this embodiment, the short-circuit protection component 100 includes a base 110, a support 120, a movable contact bridge 150, an elastic element 140, and a lower magnetic conductor 130. The support 120 is connected to the base 110; the movable contact bridge 150 is located in the space formed by the base 110 and the support 120; the elastic element 140 is located between the base 110 and the movable contact bridge 150; the lower magnetic conductor 130 has at least one notch 131 for accommodating the support 120. After the support 120 is connected to the base 110, a "cage" or "frame" structure is formed. By creating the notch 131 on the lower magnetic conductor 130, the supporting force of the lower magnetic conductor 130 on the movable contact bridge 150 can be more uniform while keeping the main body area of ​​the lower magnetic conductor 130 basically unchanged, thus improving the short-circuit protection stability.

[0031] For details, please continue reading Figures 2-4 In this embodiment, the short-circuit protection component 100 also includes a push rod mechanism 160. The push rod mechanism 160 includes a mounting plate 161, a push rod 162, a sleeve 163, and a moving iron core 164. The push rod 162 passes through the mounting plate 161, and one end of the push rod 162 is connected to the base 110. The sleeve 163 is connected to the mounting plate 161. The moving iron core 164 is housed in the sleeve 163, and the push rod 162 passes through the moving iron core 164. The moving iron core 164 is used to push the push rod 162 to move when it is excited, thereby driving the base 110 and the moving contact bridge 150 to move relative to the mounting plate 161.

[0032] The push rod 162 can be driven by electromagnetic drive, pre-compressed spring energy storage drive, electric motor drive, pneumatic drive or hydraulic drive, etc., and is not limited here.

[0033] Please see Figure 2 and combined Figure 7 , Figure 7 This is a schematic diagram of the insulating bracket 170 provided in an embodiment of the present invention. The short-circuit protection component 100 in this embodiment also includes the insulating bracket 170, which is connected to the mounting plate 161.

[0034] To limit the movement of the push rod 162 assembly, please refer to... Figure 2 and combined Figure 4 In this embodiment, the insulating bracket 170 has a limiting groove 171, and the base 110 is provided with a limiting plate 111. The limiting plate 111 and the limiting groove 171 are slidably engaged. The limiting groove 171 is used to constrain the movement trajectory of the push rod mechanism 160 driving the base 110. By embedding the limiting plate 111 into the limiting groove 171 of the insulating bracket 170, the limiting groove 171 forms a guide channel, allowing the push rod 162 to move along the extension direction of the limiting groove 171.

[0035] The insulating bracket 170 in this embodiment includes a base frame and a support frame, with the support frame connected to the base frame. The support frame has a mounting groove 172 for mounting an upper magnetic conductor 180, which can be snapped into the support frame. The lower magnetic conductor 130 can move up and down relative to the support frame along the height direction within the space formed by the support frame. Of course, the upper magnetic conductor 180 can also be connected to the support frame by other methods such as plug-in or threaded connection, which is not limited here. A limiting groove 171 is provided on the support frame, extending along the height direction. In this embodiment, the limiting groove 171 penetrates the base frame.

[0036] In this embodiment, the bottom frame has a square cross-sectional shape, and to enhance the overall structural strength of the bottom frame, multiple reinforcing ribs are provided inside the bottom frame. The bottom frame also includes clearance portions based on the shape and structure of the base 110 and the shapes of other structural components of the push rod 162 assembly. The cross-sectional shape of the bottom frame can also be designed as a circle, polygon, or other shapes, and is not limited here.

[0037] Please continue reading. Figure 2 and combined Figure 4 In this embodiment, the bracket 120 includes a first fixed wall 121, a second fixed wall 122, and a connecting top plate 123. The first fixed wall 121 and the second fixed wall 122 are respectively embedded in the first notch 1311 and the second notch 1312. The connecting top plate 123 connects the ends of the first fixed wall 121 and the second fixed wall 122 away from the fixed base 110; the movable contact bridge 150 is disposed between the bottom plate 133 and the connecting top plate 123. The first fixed wall 121, the second fixed wall 122, the connecting top plate 123, and the bottom plate 133 together form a closed frame structure, which encloses the movable contact bridge 150.

[0038] Please see Figure 2In this embodiment, the short-circuit assembly also includes an upper magnetic conductor 180, which is fixed to an insulating support 170. The upper magnetic conductor 180 and the lower magnetic conductor 130 are arranged opposite to each other. Under short-circuit current conditions, the DC contactor 1000 generates a magnetic field around the moving contact bridge, forming a closed magnetic field loop between the upper and lower magnetic conductors. The lower magnetic conductor is attracted by the upper magnetic conductor, causing the moving contact bridge and the stationary contact to press together, thereby counteracting the electrodynamic repulsion.

[0039] The upper magnetic conductor 180 and the lower magnetic conductor 130 here only represent the relative positional relationship when the DC contactor 1000 is in use, and do not constitute a limitation on their actual spatial position.

[0040] In addition, please continue to refer to Figure 2 In this embodiment, the short-circuit protection component 100 further includes a clamping member 190. An mounting groove 172 is formed on the top of the insulating bracket 170, and the upper magnetic conductor 180 is disposed within the mounting groove 172. The clamping member 190 is disposed on the upper magnetic conductor 180 and is used to clamp the insulating bracket 170. In this embodiment, the upper magnetic conductor 180 and the insulating bracket 170 are integrally injection molded. Specifically, the clamping member 190 in this embodiment is a silicone pad; however, other elastic materials can also be used, and this is not limited here. The clamping member 190 is elastic and compressible, and after assembly, it is in a compressed state to prevent the insulating bracket 170 from shaking.

[0041] Figure 5 This is a schematic diagram from a first-view perspective of the lower magnetic conductor 130 provided in an embodiment of this utility model. Please refer to... Figure 5The lower magnetic conductor 130 provided in this embodiment of the present invention is U-shaped. The lower magnetic conductor 130 includes a first sidewall 132, a base plate 133, and a second sidewall 134 connected in sequence. The first sidewall 132 has a first through-hole 1311 that divides the first sidewall 132 into a first magnetic branch 1321 and a second magnetic branch 1322. The second sidewall 134 has a second through-hole 1312 that divides the second sidewall 134 into a third magnetic branch 1341 and a fourth magnetic branch 1342. The first and second notches 1311 and 1312 are used to cooperate with the fixing components of the DC contactor 1000. By opening the first and second notches 1311 and 1312, the first and second sidewalls 132 and 134 of the lower magnetic conductor 130 are designed as a bifurcated structure. The bifurcated structure disperses the concentrated support force of the traditional single sidewall into a distributed support of multiple branches. The bifurcated structure design allows for a more uniform support force of the lower magnet on the moving contact bridge while maintaining a relatively constant area of ​​the lower magnet pole shoe, thereby improving the overall short-circuit stability of the structure. Furthermore, the first notch 1311 and the second notch 1312 directly engage with the contactor's fixing components, enabling the positioning of the lower magnet 130 and limiting its movement trajectory, thus preventing deviation during movement.

[0042] Specifically, in this embodiment, the first notch 1311 and the second notch 1312 are symmetrically arranged. The symmetrical notch 131 ensures that the magnetic circuits of the first sidewall 132 and the second sidewall 134 are completely symmetrical, and the generated electromagnetic attraction is evenly distributed on both sides of the moving contact bridge 150. In the event of a short circuit, the electrodynamic repulsion force on the moving contact bridge 150 can be balanced by the symmetrical electromagnetic attraction force, avoiding contact bridge tilting or uneven pressure caused by overload of the magnetic circuit on one side, and significantly reducing the risk of a sudden increase in contact resistance. Of course, the first notch 1311 and the second notch 1312 can also be staggered or other arrangements can be used, which are not limited here.

[0043] Please continue reading. Figure 5 In this embodiment, a first clearance groove 1332 is provided at the position corresponding to the first notch 1311 of the base plate 133; and / or, a second clearance groove 1332 is provided at the position corresponding to the second notch 1312 of the base plate 133. The first clearance groove 1332 may be provided only on the base plate 133, or the second clearance groove 1332 may be provided only on the base plate 133, or both the first clearance groove 1332 and the second clearance groove 1332 may be provided simultaneously. By providing the clearance groove 1332, the position of the fixed wall can be avoided, thereby improving the smoothness of the fixed wall's movement along the first notch 1311 and the second notch 1312.

[0044] Please see Figure 5 and combined Figure 3 and Figure 4In this embodiment, the top heights of both the first sidewall 132 and the second sidewall 134 are higher than the plane where the moving contact bridge 150 contacts the stationary contact 300. This design ensures the stability of the lower magnetic conductor 130 during installation and also prevents it from shifting during movement. Of course, the top heights of the first sidewall 132 and the second sidewall 134 can also be equal to the plane where the moving contact bridge 150 contacts the stationary contact 300.

[0045] Figure 6 This is a schematic diagram from a second perspective of the lower magnetic conductor 130 provided in an embodiment of this utility model. Please refer to... Figure 6 In this embodiment, a protrusion 1331 is formed on the side of the base plate 133 of the lower magnetic conductor 130 away from the moving contact bridge 150. One end of the elastic member 140 is sleeved on the protrusion 1331 and abuts against the lower magnetic conductor 130. The protrusion 1331 can position the elastic member 140, and the elastic member 140 sleeved on the protrusion 1331 allows the elastic member 140 to only compress and extend axially, preventing radial movement of the bottom of the elastic member 140. The protrusion 1331 and the lower magnetic conductor 130 are integrally formed, and the protrusion 1331 itself also strengthens the local strength of the base plate 133 of the lower magnetic conductor 130. By sleeved on the protrusion 1331, the elastic member 140 forms a tighter mechanical connection with the lower magnetic conductor 130, reducing the possibility of abnormal noise or relative displacement between the components under vibration.

[0046] Specifically, the elastic element 140 in this embodiment is a spring. Of course, other elastic elements 140 with reset characteristics can also be used, which are not limited here.

[0047] In summary, the short-circuit protection assembly 100 includes a base 110, a support 120, a movable contact bridge 150, an elastic element 140, and a lower magnetic conductor 130. The support 120 is connected to the base 110; the movable contact bridge 150 is located in the space enclosed by the base 110 and the support 120; the elastic element 140 is located between the base 110 and the movable contact bridge 150; the lower magnetic conductor 130 has at least one notch 131 for accommodating the support 120. After the support 120 is connected to the base 110, a "cage" or "frame" structure is formed. By creating the notch 131 in the lower magnetic conductor 130, the supporting force of the lower magnetic conductor 130 on the movable contact bridge 150 can be more uniform while maintaining the main body area of ​​the lower magnetic conductor 130 essentially unchanged, thus improving short-circuit protection stability.

[0048] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A short-circuit protection component, characterized in that, include: Base (110); A bracket (120) is connected to the base (110); A movable contact bridge (150) is located in the space enclosed by the base (110) and the support (120); An elastic element (140) is located between the base (110) and the movable contact bridge (150); The lower magnetic conductor (130) has at least one notch (131) for accommodating the bracket (120).

2. The short-circuit protection component according to claim 1, characterized in that, The lower magnetic conductor (130) is U-shaped. The lower magnetic conductor (130) includes a first sidewall (132), a base plate (133), and a second sidewall (134) connected in sequence. The notch (131) includes a first notch (1311) and a second notch (1312). The first sidewall (132) has a first notch (1311) that runs through the axial direction. The first notch (1311) divides the first sidewall (132) into a first magnetic branch (1321) and a second magnetic branch (1322). The second sidewall (134) has a second notch (1312) that runs through the axial direction. The second notch (1312) divides the second sidewall (134) into a third magnetic branch (1341) and a fourth magnetic branch (1342).

3. The short-circuit protection component according to claim 2, characterized in that, The first gap (1311) and the second gap (1312) are symmetrically arranged.

4. The short-circuit protection component according to claim 1, characterized in that, The bottom plate (133) of the lower magnetic conductor (130) has a protrusion (1331) on the side away from the moving contact bridge (150), and one end of the elastic member (140) is sleeved on the protrusion (1331) and abuts against the lower magnetic conductor (130).

5. The short-circuit protection component according to claim 1, characterized in that, The short-circuit protection assembly (100) further includes a push rod mechanism (160), which includes a mounting plate (161), a push rod (162), a sleeve (163), and a moving iron core (164). The push rod (162) passes through the mounting plate (161), and one end of the push rod (162) is connected to the base (110). The sleeve (163) is connected to the mounting plate (161), and the moving iron core (164) is housed in the sleeve (163). The push rod (162) passes through the moving iron core (164). The moving iron core (164) is used to push the push rod (162) to move when excited, thereby driving the base (110) and the moving contact bridge (150) to move relative to the mounting plate (161).

6. The short-circuit protection component according to claim 5, characterized in that, The short-circuit protection assembly (100) also includes an insulating bracket (170) connected to the mounting plate (161).

7. The short-circuit protection component according to claim 6, characterized in that, The insulating bracket (170) has a limiting groove (171), and the base (110) is provided with a limiting plate (111). The limiting plate (111) cooperates with the limiting groove (171), and the limiting groove (171) is used to constrain the movement trajectory of the push rod mechanism (160) driving the base (110).

8. The short-circuit protection component according to claim 6, characterized in that, The short-circuit protection assembly (100) further includes an upper magnetic conductor (180), which is fixed to the insulating bracket (170), and the upper magnetic conductor (180) and the lower magnetic conductor (130) are arranged opposite to each other.

9. The short-circuit protection component according to claim 8, characterized in that, The short-circuit protection assembly (100) further includes a clamping member (190). The top of the insulating bracket (170) is provided with a mounting groove (172), and the upper magnetic conductor (180) is disposed in the mounting groove (172). The clamping member (190) is disposed on the upper magnetic conductor (180) and is used to clamp the insulating bracket (170).

10. A DC contactor, characterized in that... The device includes a housing (200) and a short-circuit protection component (100) as described in any one of claims 1-9, wherein a stationary contact (300) is provided on the top of the housing (200), and the short-circuit protection component (100) is disposed within the housing (200).

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