A disconnector

Abstract

The utility model provides a kind of isolator, it is related to switch technical field.Isolator includes shell, contact mechanism and arc-extinguishing chamber.Shell is set installation cavity, heat dissipation cavity, exhaust port and cavity, installation cavity is communicated with heat dissipation cavity, exhaust port is communicated with heat dissipation cavity;Contact mechanism and arc-extinguishing chamber are all set in installation cavity;The end portion of arc-extinguishing chamber away from contact mechanism is spaced apart with shell to form first flow channel, first flow channel is communicated with heat dissipation cavity, and first flow channel is also communicated with cavity, and cavity is used to store metal particles.Therefore, it can effectively inhibit arc and metal particles to spray outside, and effectively improve the heat dissipation efficiency of arc, to protect the periphery electrical element from damage, improve the safety and stability of equipment operation.

Description

[0001] This application claims priority to the patent application filed on July 7, 2025, with application number 2025214200100 and title "A Disconnect Switch". Technical Field

[0002] This utility model relates to the field of switch technology, and more specifically, to an isolating switch. Background Technology

[0003] Disconnect switches, as commonly used switching devices in electrical systems, are primarily used to reliably disconnect circuits to ensure safe equipment maintenance and stable system operation. However, in actual operation, especially during the disconnection process, high-temperature electric arcs can easily be generated between the contacts. Due to the limited ability of existing disconnect switches in guiding and suppressing electric arcs in their structural design, the arc can easily be ejected from the arc nozzle, causing damage or even failure of surrounding electrical components, seriously affecting the overall safety and reliability of the equipment.

[0004] Furthermore, the ejected electric arc can cause thermal damage to nearby control components, sensors, or terminals, and may also ignite surrounding flammable materials, posing a serious safety hazard. At the same time, current disconnect switches are inadequate in terms of arc heat dissipation; the arc lasts for a long time, making it difficult to dissipate heat in a timely manner, further exacerbating the impact on the switch body and the surrounding environment, and reducing the equipment's lifespan and operational stability. Utility Model Content

[0005] The purpose of this invention is to provide a disconnecting switch that can effectively suppress the ejection of electric arcs and metal particles to the outside and effectively improve the heat dissipation efficiency of electric arcs, thereby protecting surrounding electrical components from damage and improving the safety and stability of equipment operation.

[0006] The embodiments of this utility model are implemented as follows:

[0007] In a first aspect, this utility model provides an isolating switch, comprising:

[0008] The housing includes a mounting cavity, a heat dissipation cavity, an exhaust port, and a cavity. The mounting cavity is connected to the heat dissipation cavity, and the exhaust port is connected to the heat dissipation cavity.

[0009] A contact mechanism, wherein the contact mechanism is disposed in the mounting cavity;

[0010] An arc-extinguishing chamber is disposed in the mounting cavity, and the end of the arc-extinguishing chamber away from the contact mechanism is spaced apart from the housing to form a first flow channel. The first flow channel communicates with the heat dissipation cavity and also communicates with the cavity, which is used to store metal particles.

[0011] In an optional embodiment, the housing is further provided with a first boss, the arc-extinguishing chamber includes a grid plate group, the end of the grid plate group away from the contact mechanism is spaced apart from the first boss to form the first flow channel, and the cavity is provided on the periphery of the first boss.

[0012] In an optional embodiment, the housing is further provided with a second protrusion, the arc-extinguishing chamber includes a mounting plate, the mounting plate is connected to both sides of the grid assembly, and the second protrusion abuts against the mounting plate to form a second flow channel between the mounting plate, the grid assembly and the housing.

[0013] In an optional embodiment, the second flow channel is connected to the first flow channel, and the first flow channel, the second flow channel, the gap between the arc-extinguishing chamber and the contact mechanism, and the gap between the grid plates together form a circulating channel that is connected end to end.

[0014] In an optional embodiment, the housing is further provided with an arc spray nozzle, which communicates with the cavity.

[0015] In an optional embodiment, the disconnecting switch further includes an arc-blocking component, the housing is provided with a mounting groove at the arc-spraying nozzle, the arc-blocking component is disposed in the mounting groove, and the arc-blocking component is used to block metal particles.

[0016] In an optional embodiment, the housing is provided with a partition that divides the internal cavity of the housing into an installation cavity and a heat dissipation cavity. A through hole is provided at the position where the partition connects to the side wall of the housing. The through hole corresponds to the first flow channel, and the installation cavity and the heat dissipation cavity are connected through the through hole.

[0017] In an optional embodiment, the disconnecting switch further includes a magnet disposed at the end of the arc-extinguishing chamber away from the contact mechanism.

[0018] In an optional embodiment, the disconnecting switch further includes an insulating cover disposed at the end of the arc-extinguishing chamber away from the contact mechanism, the magnet is mounted on the insulating cover, and the grid assembly of the arc-extinguishing chamber is made of magnetic material.

[0019] In an optional embodiment, the housing is further provided with a first boss, and the cavity is recessed and disposed on the periphery of the first boss.

[0020] The beneficial effects of the disconnecting switch provided in this embodiment include: A first flow channel is provided between the arc-extinguishing chamber and the housing, allowing high-temperature, high-pressure arc gases to flow from the mounting cavity to the heat dissipation cavity along the first flow channel and ultimately exit from the heat dissipation cavity, thereby extending the arc's heat dissipation path and effectively improving the arc's heat dissipation efficiency. Furthermore, a cavity communicating with the first flow channel is provided in the housing at the rear end of the arc-extinguishing chamber away from the contact mechanism, allowing most of the metal particles ejected from the arc-extinguishing chamber to enter and be stored in the cavity via the first flow channel. This effectively suppresses the discharge of metal particles, preventing the failure or even burnout of other electronic components, thus protecting surrounding electrical components from damage and improving the safety and stability of the disconnecting switch operation. Attached Figure Description

[0021] 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.

[0022] Figure 1 A schematic diagram of the disconnector switch structure provided in an embodiment of this utility model;

[0023] Figure 2 This is a schematic diagram of the internal structure of the disconnecting switch provided in an embodiment of the present utility model;

[0024] Figure 3 A cross-sectional view of the disconnecting switch provided in an embodiment of this utility model;

[0025] Figure 4 This is a simplified cross-sectional schematic diagram of the disconnecting switch provided in an embodiment of the present utility model;

[0026] Figure 5 A schematic diagram of the internal structure of the housing provided in an embodiment of this utility model;

[0027] Figure 6 A schematic diagram of the arc-extinguishing chamber, magnet, and insulating cover provided for an embodiment of this utility model.

[0028] Icons: 10-Disconnecting switch; 100-Housing; 110-Mounting cavity; 111-First flow channel; 120-Heat dissipation cavity; 121-Exhaust port; 122-Heat dissipation hole; 130-Cavity; 140-Separation section; 141-Through hole; 150-First boss; 160-Second boss; 170-Arc ejection port; 180-Mounting groove; 190-Second flow channel; 200-Contact mechanism; 210-Moving contact; 220-Stationary contact; 300-Arc extinguishing chamber; 310-Grid assembly; 320-Mounting plate; 400-Arc isolation component; 500-Magnet; 600-Insulating cover. Detailed Implementation

[0029] 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.

[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] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0033] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] Disconnect switches, as commonly used switching devices in electrical systems, are primarily used to reliably disconnect circuits to ensure safe equipment maintenance and stable system operation. However, in actual operation, especially during the disconnection process, high-temperature electric arcs can easily be generated between the contacts. Due to the limited ability of existing disconnect switches in guiding and suppressing electric arcs in their structural design, the arc can easily be ejected from the arc nozzle, causing damage or even failure of surrounding electrical components, seriously affecting the overall safety and reliability of the equipment.

[0036] Furthermore, the ejected electric arc can cause thermal damage to nearby control components, sensors, or terminals, and may also ignite surrounding flammable materials, posing a serious safety hazard. At the same time, current disconnect switches are inadequate in terms of arc heat dissipation; the arc lasts for a long time, making it difficult to dissipate heat in a timely manner, further exacerbating the impact on the switch body and the surrounding environment, and reducing the equipment's lifespan and operational stability.

[0037] Based on the problems existing in the current technology, please refer to Figures 1 to 5 This utility model provides an isolating switch that can effectively suppress the arc from being ejected to the outside and effectively improve the heat dissipation efficiency of the arc, thereby protecting the surrounding electrical components from damage and improving the safety and stability of equipment operation.

[0038] In detail, the disconnecting switch 10 includes a housing 100, a contact mechanism 200, and an arc-extinguishing chamber 300.

[0039] The housing 100 includes an installation cavity 110, a heat dissipation cavity 120, an exhaust port 121, and a cavity 130. The installation cavity 110 is connected to the heat dissipation cavity 120, and the exhaust port 121 is connected to the heat dissipation cavity 120. The contact mechanism 200 and the arc-extinguishing chamber 300 are both located in the installation cavity 110. The end of the arc-extinguishing chamber 300 away from the contact mechanism 200 is spaced apart from the housing 100 to form a first flow channel 111. The first flow channel 111 is connected to the heat dissipation cavity 120 and also to the cavity 130, which is used to store metal particles.

[0040] In this embodiment, when the contact mechanism 200 closes or opens and generates an arc, the arc can be quickly ignited and extinguished through the arc-extinguishing chamber 300. A first flow channel 111 is provided between the arc-extinguishing chamber 300 and the housing 100 so that the high-temperature, high-pressure arc gas flows from the mounting cavity 110 to the heat dissipation cavity 120 along the first flow channel 111 and is finally discharged from the exhaust port 121 of the heat dissipation cavity 120. This extends the heat dissipation path of the arc and thus improves the effective heat dissipation efficiency of the arc.

[0041] Furthermore, by providing a cavity 130 connected to the first flow channel 111 in the housing 100 of the arc-extinguishing chamber 300 away from the rear end of the contact mechanism 200, most of the metal particles ejected from the arc-extinguishing chamber 300 enter the cavity 130 through the first flow channel 111 and are stored in the cavity 130. This effectively suppresses the discharge of metal particles, which could lead to the failure or even burnout of other electronic components, thereby protecting the surrounding electrical components from damage and improving the safety and stability of the disconnect switch 10 operation.

[0042] It should also be noted that there are one or more exhaust ports 121, and the exhaust ports 121 are arranged at an angle.

[0043] It is understandable that there may be one or more cavities 130.

[0044] In this embodiment, as shown in the figure, two cavities 130 are provided at the rear end of the arc-extinguishing chamber 300.

[0045] In detail, the housing 100 is provided with a partition 140, which divides the internal cavity of the housing 100 into an installation cavity 110 and a heat dissipation cavity 120. A through hole 141 is provided at the position where the partition 140 connects with the side wall of the housing 100. The through hole 141 corresponds to the first flow channel 111, and the installation cavity 110 and the heat dissipation cavity 120 are connected through the through hole 141.

[0046] In this embodiment, the through hole 141 corresponds to the first flow channel 111, thus facilitating the entry of the electric arc into the heat dissipation cavity 120 through the through hole 141 along the first flow channel 111.

[0047] As shown in the figure, there are two partitions 140 to divide the internal chamber of the housing 100 into one mounting chamber 110 and two heat dissipation chambers 120. There are also two arc-extinguishing chambers 300, which are arranged on opposite sides of the mounting chamber 110.

[0048] It should also be noted that the outer shell is composed of a base and an end cap. The base and the end cap are respectively provided with protrusions to form a partition 140. The mounting cavity 110, the heat dissipation cavity 120, the exhaust port 121 and the cavity 130 are all surrounded by the base and the end cap.

[0049] Furthermore, the housing 100 is also provided with a first boss 150, and the arc-extinguishing chamber 300 includes a grid plate group 310. The end of the grid plate group 310 away from the contact mechanism 200 is spaced apart from the first boss 150 to form a first flow channel 111.

[0050] In this embodiment, the cavity 130 is disposed on the periphery of the first boss 150. One end of the grid plate group 310 faces the contact mechanism 200, and the other end faces the first boss 150 and is spaced apart from the first boss 150. Therefore, there is a gap between the grid plate group 310 and the first boss 150, forming a first flow channel 111, so that after the electric arc is discharged from the grid plate group 310, it flows along the first flow channel 111 to the heat dissipation cavity 120.

[0051] Furthermore, a cavity 130 formed by a recessed structure is provided around the first protrusion 150. That is, the first protrusion 150 protrudes from the recessed structure of the cavity 130. Therefore, the metal particles and high-temperature gas flow ejected from the arc-extinguishing chamber 300 will be blocked by the first protrusion 150 and stay there, making it easier for the metal particles to deposit in the cavity 130 around the first protrusion 150, thus improving the deposition efficiency.

[0052] Furthermore, the housing 100 is also provided with a second boss 160, and the arc-extinguishing chamber 300 includes a mounting plate 320, which is connected to both sides of the grid assembly 310. The second boss 160 abuts against the mounting plate 320 to form a second flow channel 190 between the mounting plate 320, the grid assembly 310 and the housing 100.

[0053] In this embodiment, the second boss 160 abuts against the mounting plate 320 to create a gap between the arc-extinguishing chamber 300 and the side wall of the housing 100 to form a second flow channel 190, thereby further improving the flow space and path of the electric arc and facilitating arc heat dissipation.

[0054] It is worth noting that the second flow channel 190 is connected to the first flow channel 111, and as... Figure 4As shown, the gaps between the first flow channel 111, the second flow channel 190, the arc-extinguishing chamber 300 and the contact mechanism 200, and the gaps between the grid plate groups 310 together form a circulating channel that is connected end to end.

[0055] Therefore, while the electric arc flows from the arc-extinguishing chamber 300 along the first flow channel 111 to the heat dissipation cavity 120, some gas also flows from the first flow channel 111 to the second flow channel 190, and from the second flow channel 190 to the gap between the arc-extinguishing chamber 300 and the contact mechanism 200, and from this gap it flows back from the arc-extinguishing chamber 300 to the first flow channel 111, thus forming a gas circulation channel. In this way, the gas circulation efficiency around the arc-extinguishing chamber 300 is significantly improved, thus effectively improving the heat dissipation efficiency, which is conducive to improving the arc extinguishing speed and the cooling speed of the contact mechanism 200.

[0056] Furthermore, since high-temperature and high-pressure gas will be generated when an electric arc is generated in the contact mechanism 200, in order to avoid the high-temperature and high-pressure gas generated instantaneously affecting the interior of the disconnect switch 10, the housing 100 is also provided with an arc nozzle 170, which is connected to the cavity 130, so that the high-temperature and high-pressure gas can be ejected in time through the arc nozzle 170, thereby playing a role in pressure relief.

[0057] To prevent metal particles from being ejected from the arc nozzle 170, the disconnect switch 10 also includes an arc-blocking component 400. The housing 100 has a mounting groove 180 at the arc nozzle 170, and the arc-blocking component 400 is disposed in the mounting groove 180. The arc-blocking component 400 is used to block metal particles.

[0058] In this embodiment, the arc-blocking component 400 is mesh-like, which can effectively block metal particles while ensuring the passage of gas, thereby preventing metal particles from being ejected from the arc-spraying nozzle 170.

[0059] Furthermore, the nozzle 170 is also composed of mesh-like through holes 141, which further blocks metal particles, thereby further restricting the metal particles from being ejected from the nozzle 170.

[0060] Furthermore, the contact mechanism 200 includes a moving contact 210 and a stationary contact 220. The moving contact 210 is movably disposed in the mounting cavity 110. One end of the stationary contact 220 is disposed in the mounting cavity 110, and the other end extends to the outside of the housing 100. The housing 100 is also provided with a heat dissipation hole 122 in the heat dissipation cavity 120, which corresponds to the stationary contact 220.

[0061] In this embodiment, by providing a heat dissipation hole 122 in the heat dissipation cavity 120, the heat dissipation hole 122 is connected to the part of the housing 100 where the stationary contact 220 is installed. That is, the stationary contact 220 can be exposed through the heat dissipation hole 122, so that the stationary contact 220 can be cooled through the heat dissipation hole 122.

[0062] Further, please refer to Figure 6 The disconnector switch 10 also includes a magnet 500, which is located at the end of the arc-extinguishing chamber 300 away from the contact mechanism 200.

[0063] Specifically, the magnet 500 can be a rectangular block structure. By placing the magnet 500 at the end of the air outlet of the grid plate group 310 in the arc-extinguishing chamber 300, the magnetic field generated by the magnet 500 can guide the electric arc generated when the moving contact 210 and the stationary contact 220 are separated towards the grid plate group 310, thereby enabling the electric arc to quickly enter the arc-extinguishing chamber 300 and extinguish it, thus improving the arc-extinguishing effect.

[0064] It is understood that in this embodiment, the number of magnets can be one or more, or they can be set in pairs, and no specific limitation is made here.

[0065] It is worth mentioning that by placing the magnet 500 at the end of the air outlet of the grid assembly 310, this embodiment reduces the number of magnets 500 compared to placing them in other locations (such as the sides, top, or bottom of the grid assembly 310), thus saving costs.

[0066] Of course, in other embodiments of this utility model, the magnet 500 can also be other shapes, such as arc, circle, square, etc. The shape of the magnet 500 is not specifically limited here.

[0067] Furthermore, it should be noted that in this embodiment, the grid plate group 310 of the arc-extinguishing chamber 300 is made of magnetic material. Therefore, the disconnecting switch 10 also includes an insulating cover 600. The end of the air outlet of the grid plate group 310 of the arc-extinguishing chamber 300 has a groove. The insulating cover 600 is disposed in the groove of the grid plate group 310. The magnet 500 is installed on the insulating cover 600, and there is a stepped gap between the insulating cover 600 and the magnet 500. This ensures that the side wall of the magnet 500 does not contact the insulating cover 600, which is conducive to heat dissipation and prevents the magnet 500 from losing magnetism. This ensures that the insulating cover 600 and the grid plate group 310 effectively play an isolation role.

[0068] Optionally, the insulating cover 600 may be made of materials such as plastic. Of course, in other embodiments of this utility model, the insulating cover 600 may also be made of other materials. The material of the insulating cover 600 is not specifically limited here.

[0069] In summary, this utility model provides a disconnecting switch 10. A first flow channel 111 is provided between the arc-extinguishing chamber 300 and the housing 100, so that high-temperature, high-pressure arc gases flow from the mounting cavity 110 to the heat dissipation cavity 120 along the first flow channel 111 and are finally discharged from the heat dissipation cavity 120, thereby extending the heat dissipation path of the arc and thus improving the effective heat dissipation efficiency of the arc. Furthermore, a cavity 130 communicating with the first flow channel 111 is provided in the housing 100 at the rear end of the arc-extinguishing chamber 300 away from the contact mechanism 200. This allows most of the metal particles ejected from the arc-extinguishing chamber 300 to enter the cavity 130 through the first flow channel 111 and be stored within the cavity 130. This effectively suppresses the discharge of metal particles that could cause other electronic components to fail or even burn out, thus protecting surrounding electrical components from damage and improving the safety and stability of the disconnecting switch 10.

[0070] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A disconnecting switch (10), characterized in that, include: A housing (100) is provided with a mounting cavity (110), a heat dissipation cavity (120), an exhaust port (121), and a cavity (130). The mounting cavity (110) is connected to the heat dissipation cavity (120), and the exhaust port (121) is connected to the heat dissipation cavity (120). A contact mechanism (200) is disposed in the mounting cavity (110); An arc-extinguishing chamber (300) is disposed in the mounting cavity (110), and the end of the arc-extinguishing chamber (300) away from the contact mechanism (200) is spaced apart from the housing (100) to form a first flow channel (111). The first flow channel (111) communicates with the heat dissipation cavity (120) and also communicates with the cavity (130), which is used to store metal particles.

2. The disconnector (10) according to claim 1, characterized in that, The housing (100) is further provided with a first boss (150), the arc-extinguishing chamber (300) includes a grid plate group (310), the end of the grid plate group (310) away from the contact mechanism (200) is spaced apart from the first boss (150) to form the first flow channel (111), and the cavity (130) is provided on the periphery of the first boss (150).

3. The disconnector switch (10) according to claim 2, characterized in that, The housing (100) is further provided with a second boss (160), and the arc-extinguishing chamber (300) includes a mounting plate (320). The mounting plate (320) is connected to both sides of the grid assembly (310). The second boss (160) abuts against the mounting plate (320) to form a second flow channel (190) between the mounting plate (320), the grid assembly (310) and the housing (100).

4. The disconnector (10) according to claim 3, characterized in that, The second flow channel (190) is connected to the first flow channel (111), and the gaps between the first flow channel (111), the second flow channel (190), the arc-extinguishing chamber (300) and the contact mechanism (200), and the gaps between the grid plate group (310) together form a circulating channel that is connected end to end.

5. The disconnector (10) according to claim 1, characterized in that, The housing (100) is also provided with an arc spray nozzle (170), which is connected to the cavity (130).

6. The disconnector (10) according to claim 5, characterized in that, The disconnect switch (10) further includes an arc-blocking component (400). The housing (100) has an installation groove (180) at the arc nozzle (170). The arc-blocking component (400) is disposed in the installation groove (180) and is used to block metal particles.

7. The disconnector switch (10) according to claim 1, characterized in that, The housing (100) is provided with a partition (140), which divides the internal cavity of the housing (100) into an installation cavity (110) and a heat dissipation cavity (120). A through hole (141) is provided at the position where the partition (140) connects to the side wall of the housing (100). The through hole (141) corresponds to the first flow channel (111). The installation cavity (110) and the heat dissipation cavity (120) are connected through the through hole (141).

8. The disconnector (10) according to any one of claims 1-7, characterized in that, The disconnect switch (10) also includes a magnet (500), which is disposed at the end of the arc-extinguishing chamber (300) away from the contact mechanism (200).

9. The disconnector (10) according to claim 8, characterized in that, The disconnect switch (10) further includes an insulating cover (600), which is disposed at the end of the arc-extinguishing chamber (300) away from the contact mechanism (200). The magnet (500) is mounted on the insulating cover (600), and the grid plate group (310) of the arc-extinguishing chamber (300) is made of magnetic material.

10. The disconnector (10) according to claim 1, characterized in that, The housing (100) is also provided with a first boss (150), and the cavity (130) is recessed and disposed on the periphery of the first boss (150).

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