Large-through-flow surge protection device
By installing an insulating plate and a heat insulation cavity in the surge protector, and using air as the heat insulation medium, the problem of excessive temperature rise caused by heat transfer from the core to the outer casing is solved. This reduces the heat transferred from the core to the outer casing, prevents the surface temperature of the outer casing from exceeding the standard, and meets the standard requirements.
Patent Information
- Application Number
- CN202423134755.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2034-12-18
AI Technical Summary
When a traditional high-current surge protector fails, the heat from the core is directly transferred to the casing, causing the surface temperature of the casing to rise beyond the standard and fail to meet the requirements.
An insulating plate and a heat insulation cavity are set between the mechanism and the outer shell, using air as the heat insulation medium to reduce heat transfer. The supporting protrusion abuts against the inner surface of the side wall of the outer shell. An insulating plate and a heat insulation cavity are set between the outer shells. The supporting protrusion forms a gap with the inner wall of the outer shell to form a heat insulation cavity, using air as the heat insulation medium to reduce heat transfer.
This effectively reduces the heat transferred from the movement to the outer casing, preventing the surface temperature of the casing from exceeding the standard and meeting the requirements.
Smart Images
Figure CN223680743U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of surge protector, concretely relates to a large current surge protector. BACKGROUND
[0002] Surge protector, it is a kind of electrical appliance for limiting transient overvoltage and discharging voltage current, can effectively prevent the damage of surge pulse and transient overvoltage caused by external (lightning, electromagnetic radiation interference etc.) or system internal (system pull-in and off effect, induction and the start and stop of capacitive load etc.) to equipment, to provide safety protection for various electronic equipment, instrument, communication line.
[0003] The large current surge protector for 1U cabinet needs to be inserted into 1U cabinet for installation, therefore, the size of the surge protector shell is only about 40mm in height space, due to the large size of the internal pressure-sensitive element of the large current surge protector, the internal structure is very compact, and the traditional design is that the core and the shell are often closely attached, which leads to that when the surge protector fails, due to the high disengagement temperature of the large current surge protector, the heat of the core is directly transmitted to the shell through the plastic main body, causing the surface temperature of the shell to rise too high, exceeding the standard requirement value. UTILITY MODEL CONTENTS
[0004] Therefore, the utility model aims at providing a large current surge protector, which can reduce the heat transmitted from the core to the shell and solve the problem of surface temperature rise exceeding the standard when the large current surge protector fails.
[0005] The technical scheme of the utility model is as follows:
[0006] The utility model provides a large current surge protector, which comprises a shell and a core, the core is arranged in the shell, the core comprises a main body, the main body has a connecting side and an arc-extinguishing side, an insulating plate is arranged between the connecting side and the shell, and a gap exists between the arc-extinguishing side and the side wall of the shell to form a heat insulation cavity.
[0007] As an optional scheme, the arc-extinguishing side is provided with a supporting protrusion, and the supporting protrusion abuts against the inner wall of the shell.
[0008] As an optional scheme, the number of the supporting protrusions is two, and the two supporting protrusions are respectively close to the two ends of the arc-extinguishing side.
[0009] As an optional scheme, the height of the heat insulation cavity is 1mm.
[0010] As an optional scheme, the core comprises a disengagement spring and a connecting strip, the disengagement spring comprises a connecting part and a bending part in the shape of 7, the connecting strip is provided with a widened part, the connecting part and the widened part are width-matched and connected to the connecting side.
[0011] As an option, the movement further comprises a pressure sensitive element, a disengaging slider and a disengaging spring, one end of the bent part is low temperature welded with the pressure sensitive element at a low temperature welding position, the disengaging slider is slidingly arranged in the main body and can be inserted into the low temperature welding position under the action of the disengaging spring.
[0012] As an option, there is a gap between the connecting part and the insulating plate.
[0013] As an option, further comprising an indicating arm having at least two indicating areas, the housing is provided with an alarm window, the indicating arm is in follow-up cooperation with the disengaging slider of the movement to align the different indicating areas with the alarm window.
[0014] As an option, the large current flow surge protector further comprises a reset torsion spring, the indicating arm is swingably arranged in the housing and abuts against the disengaging slider, and the reset torsion spring makes the indicating arm have a reset tendency.
[0015] As an option, the colors of the at least two indicating areas are different.
[0016] The beneficial effects of the present application are:
[0017] The large current flow surge protector provided by the present application sets the insulating plate and the heat insulation cavity in the only space between the movement and the housing, uses air as the heat insulation medium, thereby reducing the heat transferred from the movement to the housing, and solves the problem of excessive surface temperature rise when the movement fails. BRIEF DESCRIPTION OF DRAWINGS
[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor. Through the drawings shown, the above and other purposes, features and advantages of the present application will be clearer. In all the drawings, the same reference signs indicate the same parts. The drawings are not necessarily drawn in proportion to the actual size, and the emphasis is on showing the main idea of the present application.
[0019] Figure 1 Structure diagram of the large current flow surge protector provided by the present application Figure One ;
[0020] Figure 2 Structure diagram of the large current flow surge protector provided by the present application Figure Two ;
[0021] Figure 3 Internal structure diagram of large current surge protection device provided by the utility model Figure One
[0022] Figure 4 Internal structure diagram of large current surge protection device provided by the utility model Figure Two
[0023] Figure 5 Internal structure diagram of large current surge protection device provided by the utility model Figure Three
[0024] Figure 6 A-A sectional view of Figure 2
[0025] Figure 7 Partial structure (remove shell) diagram of large current surge protection device provided by the utility model Figure One
[0026] Figure 8 Partial structure (remove shell) diagram of large current surge protection device provided by the utility model Figure Two
[0027] Figure 9 Cooperation relation diagram of disengagement spring and first connecting strip of large current surge protection device provided by the utility model.
[0028] Icon: 10-large current surge protection device;11-shell;12-core;110-alarm window;111-heat insulation cavity;112-insulating plate;120-main body;121-connecting side;122-arc extinguishing side;124-supporting protrusion;130-pressure sensitive element;140-tripping assembly;141-disengagement spring;142-disengagement sliding block;143-disengagement spring;144-connection part;145-bent part;150-connection assembly;151-first connecting strip;152-second connecting strip;153-first part;154-second part;155-plug-in interface;160-alarm indication assembly;161-indication arm;162-reset torsional spring;163-indication area. DETAILED DESCRIPTION
[0029] In order to make the purpose, technical scheme and advantages of the utility model embodiments clearer, the technical scheme in the utility model embodiments will be described clearly and completely below in combination with the drawings in the utility model embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The components of the utility model embodiments described and shown in the drawings here can be arranged and designed in various different configurations.
[0030] 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.
[0031] 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.
[0032] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.
[0033] Please refer to Figure 1 , Figure 2 As shown, an embodiment of this utility model provides a high-current surge protector 10, which is mainly used in 1U cabinets. The high-current surge protector 10 needs to be inserted into the 1U cabinet for installation. Each 1U cabinet has several high-current surge protectors 10 installed. The several high-current surge protectors 10 can be connected in sequence. The high-current surge protector 10 can effectively protect the equipment from damage caused by surge pulses and instantaneous overvoltages caused by external or internal systems, thereby providing safety protection for electronic equipment, instruments, communication lines, etc. in the 1U cabinet.
[0034] In this regard, please combine Figures 3-5 As shown, the surge protector 10 mainly consists of a housing 11 and a core 12, with the core 12 housed inside the housing 11.
[0035] The outer casing 11 is generally made of insulating materials such as plastic or ceramic. The structure of the outer casing 11 can refer to existing technology; its interior is hollow and can be used to house components such as the mechanism 12. The outer casing 11 is generally a cuboid structure, with one end being a plug-in terminal and the other end being a panel terminal. The plug-in terminal is used for plugging into the 1U rack, and the panel terminal allows for observation by staff. Of course, the outer casing 11 can also have a prismatic structure, etc.
[0036] In this embodiment, the outer shell 11 includes two half-shells that are detachably connected. One half-shell can be fastened onto the other half-shell, forming a hollow structure between the two half-shells. The method of fixing the two half-shells is not limited, such as bonding, snap-fitting, or connection by threaded fasteners. In other embodiments, the outer shell 11 may also be a one-piece structure or composed of multiple separate parts.
[0037] The core 12 can be disconnected when encountering surge pulse and transient overvoltage, thereby preventing damage to the equipment caused by the surge pulse and transient overvoltage. The structure of the core 12 can refer to the prior art. In the embodiment, please refer to the core 12 shown in the figure Figures 6-8 The core 12 mainly consists of a main body 120, a pressure-sensitive element 130, a tripping assembly 140, and a connecting assembly 150. The connecting assembly 150 includes two connecting strips, i.e., a first connecting strip 151 and a second connecting strip 152. The first connecting strip 151 is electrically connected to the connecting portion 144, and the second connecting strip 152 is connected to the pressure-sensitive element 130. The first connecting strip 151, the tripping assembly 140, the pressure-sensitive element 130, and the second connecting strip 152 form a complete loop, and the first connecting strip 151 and the second connecting strip 152 can be connected to the plug-in interface 155.
[0038] The structure of the main body 120 is not limited and can refer to the prior art. Generally, the pressure-sensitive element 130 and the tripping assembly 140 are located on opposite sides of the main body 120. The main body 120 has a connecting side 121 and an arc-extinguishing side 122, and the tripping assembly 140 and the first connecting strip 151 are connected on the connecting side 121. The connecting side 121 and the arc-extinguishing side 122 can be regarded as the upper and lower sides in the height direction or as the opposite sides of the main body 120. Of course, in other embodiments, the connecting side 121 and the arc-extinguishing side 122 can also be adjacent. It should be noted that the names of the connecting side 121 and the arc-extinguishing side 122 are only used for differentiation and do not mean that the first connecting strip 151 and the tripping assembly 140 must be connected on the connecting side 121 and must be arc-extinguished near the arc-extinguishing side 122.
[0039] An insulating plate 112 is arranged between the connecting side 121 and the shell 11. The insulating plate 112 is made of an insulating material, and the type of the insulating material is not limited, such as ceramic, insulating resin, plastic, etc. Since the tripping assembly 140 and the connecting assembly 150 are connected at the connecting portion, the tripping assembly 140 and the first connecting strip 151 are both metal parts. The insulating plate 112 separates the connecting portion from the shell 11, which not only has an insulating effect but also blocks heat, thereby avoiding excessive temperature rise of the surface of the shell 11.
[0040] There is a gap between the arc-extinguishing side 122 and the side wall of the shell 11, and the gap forms a heat insulation cavity 111. The height of the heat insulation cavity 111 is not limited and is relatively small, which can be 0.9 mm, 1 mm, 1.1 mm, etc., and is preferably 1 mm. The setting of the 1 mm heat insulation cavity 111 has little effect on the size and shape of the shell 11 and the main body 120. The arc-extinguishing side 122 and the side wall of the shell 11 do not directly contact each other. When the heat of the main body 120 enters the heat insulation cavity 111, the air in the heat insulation cavity 111 can act as a heat insulation medium, and the heat of the core 12 can be dissipated at this position, thereby avoiding heat transfer to the shell 11 and thus avoiding the problem of excessive temperature rise of the shell 11.
[0041] Due to the existence of the heat insulation cavity 111, the arc extinguishing side 122 is not in abutment with the side wall of the shell 11, and the side wall of the shell 11 is difficult to support the arc extinguishing side 122, so that the main body 120 can be limited by other parts of the shell 11, for example, the two half shells clamp the main body 120 or set a limiting structure at other parts. In order to maintain the stability of the main body 120, in the embodiment, the arc extinguishing side 122 is provided with a supporting protrusion 124, which is in abutment with the inner surface of the side wall of the shell 11.
[0042] The supporting protrusion 124 and the main body 120 can be integrally formed, or can adopt a detachable connection mode, or the supporting protrusion 124 and the shell 11 are integrally formed. The supporting protrusion 124 can be strip-shaped, block-shaped, point-shaped, etc., the number of the supporting protrusion 124 is not limited, and can be one or two, and the position of the supporting protrusion 124 is not limited, for example, the middle, both ends, etc. of the arc extinguishing side 122. In the embodiment, the number of the supporting protrusion 124 is two, each supporting protrusion 124 is a long strip, and the two supporting protrusions 124 are respectively close to both ends of the arc extinguishing side 122. Although the supporting protrusion 124 is part of the main body 120, and the supporting protrusion 124 is in abutment with the side wall of the shell 11, the contact area between the supporting protrusion 124 and the inner surface of the side wall of the shell 11 is small, the heat transfer is limited, and the heat of the main body 120 is not easily transferred to the shell 11, which will not cause the surface temperature rise of the shell 11.
[0043] The pressure sensitive element 130 is installed on one side of the main body 120, and the main body 120 can be provided with a corresponding structure such as a groove for accommodating the pressure sensitive element 130, and the shape, model, etc. of the pressure sensitive element 130 can refer to the prior art.
[0044] The tripping assembly 140 is installed on the main body 120, and the tripping assembly 140 cooperates with the pressure sensitive element 130 and the connecting assembly 150 respectively, specifically, the structure of the tripping assembly 140 can be selected but not limited to the following schemes: the tripping assembly 140 includes a tripping spring piece 141, a tripping sliding block 142 and a tripping spring 143.
[0045] The tripping spring piece 141 can be made of a metal material capable of conducting electricity, and the width thereof can refer to the prior art. The tripping spring piece 141 includes a connecting part 144 and a bending part 145, which are integrally formed or welded, etc. The connecting part 144 and the bending part 145 are bent at the connection, and the bending angle can be set as required, for example, 60°, 90°, 100°, etc., and preferably 90°.
[0046] The bending part 145 and the pressure sensitive element 130 can be located on opposite sides of the main body 120, and a low-temperature soldering window can be arranged on the main body 120. One end of the bending part 145 and the pressure sensitive element 130 are low-temperature soldered by low-temperature solder at the low-temperature soldering window. When the temperature of the low-temperature soldering part increases, the bending part 145 and the pressure sensitive element 130 can be separated from each other. In other embodiments, the bending part 145 and the pressure sensitive element 130 can also be located on the same side or adjacent side of the main body 120.
[0047] The separation slider 142 is made of insulating material, and the material is not limited, such as plastic, ceramic, etc. The shape of the separation slider 142 is not limited. The separation slider 142 is in sliding fit with the main body 120, and the sliding fit mode of the two is not limited. For example, a slide rail or guide rod can be arranged on one side of the main body 120, and the separation slider 142 is in sliding fit with the slide rail or is sleeved on the guide rod. The separation slider 142 is located between the bending part 145 and the main body 120. One end of the bending part 145 away from the connecting part 144 can be bent downward and low-temperature soldered with the pressure sensitive element 130. When the low-temperature soldering part fails, the separation slider 142 can slide along the main body 120 and move to the position between the bending part 145 and the low-temperature soldering part of the pressure sensitive element 130, so as to separate the bending part 145 and the pressure sensitive element 130 to avoid abnormal contact between the two.
[0048] The separation spring 143 can be a compression spring or a tension spring, and the number is not limited, which can be one or two or three, etc. Taking the tension spring as an example, one end of the separation spring 143 is connected with the main body 120, and the other end is connected with the separation slider 142. In the initial state, the separation spring 143 is in tension, and the separation spring 143 makes the separation slider 142 have the tendency to slide to the position between the bending part 145 and the pressure sensitive element 130. When the low-temperature soldering part of the bending part 145 and the pressure sensitive element 130 does not fail, the separation spring 143 is in tension but cannot pull the separation slider 142 to insert between the bending part 145 and the pressure sensitive element 130. When the low-temperature soldering part fails and the bending part 145 and the pressure sensitive element 130 are separated, the separation spring 143 can pull or push the separation slider 142 to insert between the bending part 145 and the pressure sensitive element 130.
[0049] Of course, in some embodiments, the structure of the separation assembly can also use other schemes, for example, the separation assembly does not contain the separation slider 142 or the separation spring 143, or the connecting part 144 and the bending part 145 are in the same plane, or the separation spring 143 is replaced by other elastic structures, etc.
[0050] An arc extinguishing chamber can be arranged at the position close to the low-temperature soldering window of the main body 120. The structure of the arc extinguishing chamber is not limited, and the arc extinguishing chamber can extinguish electric arc. The arc extinguishing chamber can be close to the arc extinguishing side 122. Of course, the arc extinguishing chamber can not be close to the arc extinguishing side 122, or no arc extinguishing chamber can be arranged.
[0051] Because the surge protector itself has a nominal discharge current I n: 40kA, the maximum discharge current Imax: 80kA impact requirements, the first connecting strip 151 of the connecting assembly 150 is made of metal material, when Imax: 80kA impact, a large electrical stress will be generated on the first connecting strip 151, the excessive electrical stress will cause the first connecting strip 151 to deform and tear off the low temperature solder joint of the spring 141 and the pressure sensitive element 130, resulting in the large current surge protector 10 being tripped off when subjected to lightning. In the embodiment, the following scheme can be used for improvement: please refer to Figure 9 As shown in the figure, the connecting portion 144 and the bending portion 145 are in a 7-shaped distribution, which means that the connecting portion 144 is extended towards the side of the bending portion 145, which can also be regarded as L-shaped, and if the connecting portion 144 and the bending portion 145 are placed on a plane, they will form a 7-shaped figure. In the embodiment, the corner of the 7-shaped figure is the connection between the connecting portion 144 and the bending portion 145.
[0052] The first connecting strip 151 has a first part 153 and a second part 154, the first part 153 is used to connect the plug-in interface 155, and the second part 154 is a widened portion, the width of the widened portion is greater than that of the first part 153, and the width of the widened portion is not limited and can be set as needed. Generally speaking, the greater the width of the widened portion, the higher the strength and the less likely to be deformed and torn. The connecting portion 144 is connected with the widened portion, and the connection manner is not limited, such as welding, one-piece forming, etc. The connection between the connecting portion 144 and the widened portion is located on the connecting side 121 of the main body 120. The length and width of the connecting portion 144 and the widened portion match, and they can be equal, or the length of the widened portion is slightly greater than that of the connecting portion 144, or the width of the widened portion is slightly greater than that of the connecting portion 144.
[0053] Because the lightning current changes greatly in the current direction, the electrical stress generated is the largest, so the corner where the connecting strip and the spring 141 are connected is the place with the largest electrical stress. By extending the length of the connecting portion 144 towards one side of the bending portion 145 and widening the local width of the first connecting strip 151, the current-carrying capacity and strength of the corner are strengthened, thereby weakening the electrical stress and strengthening the anti-deformation ability, and finally ensuring that the large current surge protector 10 does not fail under lightning in the case of large current.
[0054] There can be a gap between the connecting portion 144 and the insulating plate 112 to avoid heat conduction, of course, direct contact between the two is also possible.
[0055] In addition, since the disengagement slider 142 is far away from the front panel of the module, it cannot effectively indicate when the high-current surge protector 10 fails to trip, therefore, in the embodiment, the high-current surge protector 10 can further comprise an alarm indicating assembly 160, which comprises an indicating arm 161 and an indicating spring, and the indicating arm 161 is provided with indicating areas 163, and the number of the indicating areas 163 is two or more, for example, two, three, four, etc.
[0056] The structure of the indicating arm 161 is not limited, and can be block-shaped or strip-shaped, etc. The indicating arm 161 is movably connected with the housing 11, for example, slidingly connected or rotatably connected, etc. In the embodiment, the indicating arm 161 is substantially T-shaped, and the indicating arm 161 is rotatably connected with the housing 11. The pivot shaft of the indicating arm 161 and the housing 11 can be located at the middle of the indicating arm 161. One end of the indicating arm 161 is abuttingly connected with the disengagement slider 142, and the indicating arm 161 can move with the disengagement slider 142. Correspondingly, the indicating spring can be a reset torsion spring 162, which is sleeved on the pivot shaft of the indicating arm 161 and the housing 11, and the two ends of the reset torsion spring 162 are abuttingly connected with the indicating arm 161 and the housing 11, so that the indicating arm 161 has a reset tendency.
[0057] The other end of the indicating arm 161 is provided with the indicating areas 163. Different indicating areas 163 can have different patterns or different colors, which are convenient for the staff to observe. In the embodiment, the number of the indicating areas 163 is two, and the colors of the two indicating areas 163 are green and red respectively.
[0058] The housing 11 is provided with an alarm window 110, and the shape of the alarm window 110 is not limited, for example, a round hole, a square hole, an irregular hole, etc. The size of the alarm window 110 can be set according to the needs. The indicating arm 161 is movably connected with the disengagement slider 142 of the module 12, and the rotation of the indicating arm 161 can make different indicating areas 163 align with the alarm window 110.
[0059] One of the indicating areas 163 of the indicating arm 161 can be seen from the alarm window 110, and the staff can determine whether the high-current surge protector 10 has tripped according to the color of the indicating area 163. For example, when the disengagement slider 142 does not move, the green indicating area 163 aligns with the alarm window 110, and at this time, the staff can determine that the high-current surge protector 10 is working normally according to this situation. When the disengagement slider 142 moves, the red indicating area 163 aligns with the alarm window 110, and at this time, the staff can determine that the high-current surge protector 10 has tripped according to this situation. The staff can easily know the state of the high-current surge protector 10 by observing the color of the indicating area 163 at the alarm window 110, which is convenient for timely maintenance.
[0060] In other embodiments, the following alternatives can also be adopted: the alarm indicating component 160 does not contain the reset torsion spring 162, but is connected with the disengagement slider 142 and the indicating arm 161, and the disengagement slider 142 drives the indicating arm 161 to swing; the indicating spring can also be a tension spring or a compression spring, and the installation and working mode thereof can refer to the prior art, and only the indicating arm 161 has a reset tendency, and after the disengagement slider 142 acts, the indicating arm 161 can correspondingly act.
[0061] In addition, the large-current lightning surge protector can also contain a remote signaling alarm component, the structure of the remote signaling alarm component can refer to the prior art, and will not be described here again, and when the disengagement slider 142 acts, the remote signaling alarm component can be triggered, so that the staff at the back end can know the state change of the 1U cabinet in time, and maintenance and repair can be facilitated in time.
[0062] The preferred embodiments of the utility model are described above only, and are not used for limiting the utility model, for the person skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.
Claims
1. A high-current surge protector, characterized by, The device comprises a shell and a core, the core is arranged in the shell, the core comprises a main body, the main body has a connecting side and an arc-extinguishing side, an insulation plate is arranged between the connecting side and the shell, and a gap exists between the arc-extinguishing side and the side wall of the shell to form a heat insulation cavity.
2. The high-current surge protector of claim 1, wherein, The arc-extinguishing side is provided with a supporting protrusion, and the supporting protrusion abuts against the inner wall of the shell.
3. The high-current surge protector of claim 2, wherein, The number of the supporting protrusions is two, and the two supporting protrusions are respectively close to the two ends of the arc-extinguishing side.
4. The high-current surge protector of claim 1, wherein, The height of the heat insulation cavity is 1 mm.
5. The high-current surge protector of claim 1, wherein, The core comprises a separation spring and a connecting strip, the separation spring comprises a connecting part and a bending part arranged in a 7-shaped manner, the connecting strip is provided with a widened part, the connecting part and the widened part are matched in width and connected to the connecting side.
6. The surge protector of claim 5, wherein, The core further comprises a pressure-sensitive element, a separation slider and a separation spring, one end of the bending part is low-temperature welded with the pressure-sensitive element at a low-temperature welding position, the separation slider is slidingly arranged in the main body and can be inserted into the low-temperature welding position under the action of the separation spring.
7. The surge protector of claim 5, wherein, A gap exists between the connecting part and the insulation plate.
8. The high-current surge protector of claim 1, wherein, The device further comprises an indicating arm having at least two indicating areas, the shell is provided with an alarm window, and the indicating arm is in follow-up cooperation with the separation slider of the core to align the different indicating areas with the alarm window.
9. The surge protector of claim 8, wherein, The indicating arm is swingably arranged in the shell and abuts against the separation slider, and the device further comprises a reset torsion spring, the reset torsion spring makes the indicating arm have a reset tendency.
10. The surge protector of claim 8, wherein, The colors of the at least two indicating areas are different.