Solid-state circuit breaker

Abstract

A solid-state circuit breaker comprises a base and an upper cover, the base and the upper cover are matched to form a shell, an isolating switch with isolating contacts and a solid-state electronic module are arranged in the shell, the isolating switch and the solid-state electronic module are arranged side by side in the width direction of the base, and the solid-state electronic module comprises a main circuit board. A solid-state electronic switch is arranged on the main circuit board, the isolating switch is provided with a first wiring end and a second wiring end which are connected with the outside, and the first wiring end, the isolating contact, the solid-state electronic switch and the second wiring end are electrically connected in series in sequence. The utility model has the advantages of modular structure, compact internal structure, simple installation and high reliability.

Description

Technical Field

[0001] The utility model belongs to the technical field of circuit breakers, and in particular relates to a solid-state circuit breaker. Background Art

[0002] A circuit breaker is a common electrical protection device that provides both short-circuit and overload protection. Traditional circuit breakers are electromechanical in nature and typically consist of a trip unit that quickly separates the breaker's contacts when a short circuit occurs, and a thermally responsive bimetallic strip that separates the breaker's contacts if an overload persists in the circuit for an unacceptably long period of time.

[0003] Traditional circuit breakers are slow to respond when a fault occurs, typically taking milliseconds to respond and isolate the fault. This increases the risk of circuit wires catching fire, damaging electrical equipment, causing contacts to melt and re-weld together, and even in some cases causing the circuit breaker to explode.

[0004] To shorten operating times, circuit breakers have been increasingly adopting high-power semiconductors in recent years. Compared to traditional circuit breakers, which typically take several milliseconds to trip, solid-state circuit breakers can interrupt the flow of current in microseconds, offering a fast response time that reduces the risk of fire and damage to electrical equipment.

[0005] Solid-state circuit breakers don't require arc extinguishing devices, but rather isolation contacts to ensure insulation. Existing solid-state circuit breakers employ a splicing method whereby the isolating switch is connected to the solid-state electronic module, and then the output is from the solid-state electronic module. This requires the isolating switch and the solid-state electronic module to be connected longitudinally, significantly increasing the space required and hindering unified assembly within the housing. Alternatively, the isolating contacts and the solid-state electronic switch are arranged separately within the same housing, resulting in a less compact structure, lower reliability, and inconvenient unified assembly.

[0006] In view of the above-mentioned prior art, it is necessary to improve the structure of the existing solid-state circuit breaker. To this end, the applicant has made a useful design. The technical solution to be introduced below was produced in this context. Utility Model Content

[0007] The purpose of the utility model is to provide a solid-state circuit breaker, which adopts the mode of connecting the isolating switch input line to the power supply and the isolating switch output line to the load, and adopts a modular design, has a compact structure, is easy to install and has high reliability.

[0008] The objective of the present utility model is achieved in the following manner: a solid-state circuit breaker includes a base and an upper cover, the base and the upper cover cooperate to form a housing, an isolating switch having isolating contacts and a solid-state electronic module are disposed within the housing, the isolating switch and the solid-state electronic module are disposed side by side along the width direction of the base, the solid-state electronic module includes a main circuit board, the main circuit board is provided with a solid-state electronic switch, the isolating switch has a first terminal and a second terminal for external wiring, the first terminal, the isolating contact, the solid-state electronic switch, and the second terminal are electrically connected in series in sequence.

[0009] In a specific embodiment of the present invention, the isolating switch has a shell, a first terminal through-hole and a second terminal through-hole are provided on the shell, an insulating partition is provided between the first terminal through-hole and the second terminal through-hole, a first terminal and a second terminal are provided on the line between the isolating contact and the first terminal or the second terminal, the first terminal passes through the first terminal through-hole, and the second terminal passes through the second terminal through-hole and is connected to the main circuit board together, and is electrically connected to the solid-state electronic switch.

[0010] In another specific embodiment of the present invention, the isolating switch further has negative input and output terminals, and the isolating switch has at least one set of isolating contacts, each of which is electrically connected between the positive input and output terminals and between the negative input and output terminals, respectively, for achieving separation and closing and synchronous operation; the isolating switch also includes a third terminal for drawing power from the negative pole of the main circuit board, one end of the third terminal is electrically connected to the circuit between the isolating contact between the negative input and output terminals of the isolating switch and the negative output terminal, and the other end is electrically connected to the main circuit board after passing through the second terminal through hole.

[0011] In another specific embodiment of the present invention, a radiator is further included. The radiator and the isolating switch are arranged side by side in the base along the width direction of the base. The solid-state electronic module is arranged above the radiator. The isolating switch is fixedly connected to the radiator and the main circuit board.

[0012] In another specific embodiment of the present invention, the isolating switch has a wire outlet hole on the wire outlet end face on one side in the longitudinal direction of the shell, and a wire inlet hole on the wire inlet end face on the other side in the longitudinal direction. The isolating switch is provided with screw holes and positioning holes for fixing at the bottom of the shell; the bottom of the base is provided with screw mounting holes and positioning columns respectively matched with the screw holes and positioning holes, and the screws are sequentially passed through the screw mounting holes of the base and the screw holes of the isolating switch to fix the isolating switch in the base, and the wire inlet hole and the wire outlet hole on the isolating switch are aligned with the base wire inlet hole and the base wire outlet hole on the base.

[0013] In another specific embodiment of the present invention, the isolating switch is provided with at least one first limiting assembly on a side surface of the shell facing the solid-state electronic module, the first limiting assembly includes a first radiator limiting surface located at the bottom for limiting the radiator, a main circuit board mounting surface located at the top, and a screw fixing portion passing through the first radiator limiting surface and the main circuit board mounting surface; the base is provided with a second limiting assembly on the inner side wall facing the radiator, which cooperates with the first limiting assembly, the second limiting assembly includes a second radiator limiting surface located at the bottom for limiting the radiator, a main circuit board mounting buckle formed inwardly extending at the top, and an upper cover mounting buckle formed outwardly extending at the top; after one side of the main circuit board is clamped on the main circuit board mounting buckle of the second limiting assembly, it rests against the main circuit board mounting surface of the first limiting assembly; the screw passes through the circuit board mounting hole of the main circuit board, the screw fixing portion and the radiator mounting hole of the radiator from top to bottom in sequence to fix the main circuit board, the radiator and the isolating switch.

[0014] In a further specific embodiment of the present invention, a fan is further included. A base fan limiting groove is provided in the base at a position on one side of the radiator in the length direction, and an upper cover fan limiting groove is provided on the upper cover corresponding to the base fan limiting groove. The base fan limiting groove and the upper cover fan limiting groove are assembled together to form a fan installation cavity, and the fan is installed in the fan installation cavity.

[0015] In a more specific embodiment of the present invention, a third radiator limiting surface is provided on the side of the base away from the fan in the length direction, and the side wall of the fan mounting cavity facing the third radiator limiting surface serves as a fourth radiator limiting surface. The third radiator limiting surface and the fourth radiator limiting surface cooperate to limit the installation of the radiator.

[0016] In yet another specific embodiment of the present invention, the solid-state electronic module also includes a control panel and an operation display panel, the control panel is located above the main circuit board and is plugged into the main circuit board through a conductive pin header, and the operation display panel is located above the control panel and is electrically connected to the control panel through a wiring harness; a control panel limiting boss is provided in the upper cover corresponding to the control panel, which is used to limit the control panel, and an operation display panel limiting boss is provided in the upper cover corresponding to the operation display panel, and operation display panel mounting buckles are provided at intervals around the operation display panel limiting boss for limiting the installation of the operation display panel.

[0017] In yet another specific embodiment of the present invention, the isolating switch is provided with a handle at the top for operating the isolating contacts to separate or close, and the housing is provided with an indication window at the top for indicating the contact closing and opening positions; the upper cover is provided with a handle hole and an indication hole corresponding to the isolating switch.

[0018] In yet another specific embodiment of the present invention, the operation display panel is provided with a key and a first button on the upper surface, and the first button is triggered by operating the key; the key is made of transparent or translucent material.

[0019] The circuit breaker of the present invention adopts a method of connecting the incoming line and the load on the side of the disconnector, so that the interior of the circuit breaker shell adopts a modular design as a whole. The overall width occupies four modular spaces. The disconnector is installed in one modular space on one side of the width direction, while the radiator, solid-state electronic module and fan are installed in three modular spaces on the other side. Compared with the existing structure, the internal structure is compact, the installation is simple and the reliability is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is an exploded view of the overall structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the completed assembly of the base described in the utility model;

[0022] Figure 3 This is a schematic structural diagram of the isolating switch described in the present utility model;

[0023] Figure 4 This is a structural diagram of the base described in the utility model;

[0024] Figure 5 This is a bottom schematic diagram of the isolating switch described in the utility model;

[0025] Figure 6 A top view of the base of the present invention;

[0026] Figure 7 This is a schematic diagram of the top structure of the upper cover of the utility model;

[0027] Figure 8 This is a schematic diagram of the bottom structure of the upper cover of the utility model;

[0028] Figure 9 This is a schematic diagram of the side structure of the disconnector described in the utility model;

[0029] Figure 10 This is a schematic diagram of the assembly completion of the utility model;

[0030] Figure 11This is a wiring diagram for connecting the isolating switch and the solid-state electronic part of the utility model;

[0031] Figure 12 This is a cross-sectional view of the isolating switch described in the present utility model.

[0032] In the figure: 1. Base, 11. Screw mounting hole, 12. Positioning column, 13. Base wire inlet hole, 14. Base wire outlet hole, 15. Second limiting assembly part, 151. Second radiator limiting surface, 152. Main circuit board mounting buckle, 153. Upper cover mounting buckle; 16. Base fan limiting slot, 17. Third radiator limiting surface, 18. Fourth radiator limiting surface, 19. Base cooling hole; 2. Upper cover, 21. Upper cover fan limiting slot, 22. Control panel limiting boss, 23. Operation display panel limiting boss, 24. Operation display panel mounting buckle, 25. Handle hole, 26. Indicator hole, 27. Upper cover cooling hole, 28. Elastic button; 3. Isolating switch, 31. Housing, 311. First connection Wire terminal hole, 312. Second terminal terminal hole, 313. Insulating partition, 314. Wire inlet hole, 315. Wire outlet hole, 316. Screw hole, 317. Positioning hole, 318. Indicator window, 319. Wire outlet end face, 320. Wire inlet end face, 32. Positive terminal inlet, 33. Positive terminal outlet, 34. Negative terminal inlet, 35. Negative terminal outlet, 36. First limiting assembly, 361. First heat sink limiting surface, 362. Main circuit board mounting surface, 363. Screw fixing portion, 37. Handle, 38. Upper cover connecting buckle; 4. Solid-state electronic module, 41. Main circuit board, 411. Circuit board mounting hole, 42. Control panel, 43. Operation and display panel, 431. Button, 4311. Button trigger cam, 432. First button, 433. Second button; 5. Radiator, 51. Radiator mounting hole; 6. Fan; 71. First terminal, 72. Second terminal, 73. Third terminal; X. Length direction; Y. Width direction; Z. Height direction; DETAILED DESCRIPTION

[0033] The specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings. However, the description of the embodiments does not limit the technical solution. Any changes in form rather than substance based on the concept of the present invention should be regarded as within the scope of protection of the present invention.

[0034] In the following description, all concepts related to the directionality (or orientation) of up, down, left, right, front and back, as well as length and width, refer to the position state of the figure being described. The purpose is to facilitate public understanding, and therefore it cannot be understood as a special limitation on the technical solution provided by the present utility model.

[0035] like Figure 1 、 Figure 2As shown, the present invention relates to a solid-state circuit breaker, comprising a base 1 and an upper cover 2. The base 1 and upper cover 2 cooperate to form a housing, within which an isolating switch 3, a solid-state electronic module 4, a heat sink 5, and a fan 6 are disposed. The isolating switch 3 and the heat sink 5 are arranged side by side within the base 1 along the width of the base 1. The solid-state electronic module 4 is disposed above the heat sink 5 (i.e., upward in the height direction) and comprises a main circuit board 41, a control board 42, and an operation display panel 43. The isolating switch 3 is fixedly connected to the heat sink 5 and the main circuit board 41. The fan 6 is located on one side of the heat sink 5 along the length of the base 1. X represents the length direction, Y represents the width direction, and Z represents the height direction.

[0036] Specifically, the circuit breaker adopts a modular design as a whole, and the overall width occupies four modular spaces. The isolating switch 3 is installed in one modular space on one side of the width direction, and the three modular spaces on the other side are used to install the radiator 5, solid-state electronic module 4 and fan 6, etc.

[0037] In a specific embodiment, the isolating switch 3 can be a single-pole isolating switch or a two-pole isolating switch. In the two-pole isolating switch, an isolating contact can be provided in one of the poles or in both poles.

[0038] Taking the isolating switch 3 as a two-pole isolating switch as an example, the isolating switch 3 includes a positive input terminal 32, a negative input terminal 34, a positive output terminal 33, a negative output terminal 35 and an isolation contact, wherein the positive output terminal 33 and the negative output terminal 35 are used to connect the load.

[0039] like Figure 3 As shown, taking the example of isolating contacts provided in both polar lines of the isolating switch 3, each isolating contact is electrically connected between the positive input and output terminals 32, 33 and between the negative input and output terminals 34, 35, respectively. Each isolating contact can realize separation and closing operations and act synchronously.

[0040] The isolating switch 3 has a first terminal connected to the outside and a second terminal. The first terminal, the isolating contact, the solid-state electronic switch and the second terminal are electrically connected in series in sequence.

[0041] The first terminal is used to connect to a power source, and the second terminal is used to connect to a load; or the second terminal is used to connect to a power source, and the first terminal is used to connect to a load;

[0042] That is, in the above embodiment, the first terminal can be the positive electrode input terminal 32, and the second terminal can be the positive electrode output terminal 33; or the first terminal can be the negative electrode input terminal 34, and the second terminal can be the negative electrode output terminal 35; or the first terminal can be the positive electrode output terminal 33, and the second terminal can be the positive electrode input terminal 32; or the first terminal can be the negative electrode output terminal 35, and the second terminal can be the negative electrode input terminal 34.

[0043] like Figure 1 、 Figure 3 and Figure 12 The isolating switch 3 has a housing 31 with a first terminal hole 311 and a second terminal hole 312 defined therein. An insulating spacer 313 is disposed between the first and second terminal holes 311 and 312. The circuit between the isolating contact and the first or second terminal of the isolating switch 3 has a first terminal 71 and a second terminal 72 (in this example, the circuit between the isolating contact and the positive output terminal 32). The first terminal 71 passes through the first terminal hole 311, and the second terminal 72 passes through the second terminal hole 312, before being connected to the main circuit board 41 and electrically connected to the solid-state electronic switch. The first and second terminals 71 and 72 are used to prevent breakdown due to proximity. The first terminal 71 and the second terminal 72 are made of soft braided wire, and the ends of the first terminal 71 and the second terminal 72 connected to the main circuit board 41 can adopt "L"-shaped welding heads or "I"-shaped welding heads; another solution is to facilitate switch maintenance, and the first terminal 71 and the second terminal 72 are fixed to the main circuit board 41 by screws.

[0044] See Figure 11 Furthermore, the isolating switch 3 also includes a third terminal 73 for drawing power from the negative pole of the main circuit board 41. One end of the third terminal 73 is electrically connected to the circuit between the isolation contact between the negative input and output terminals 34 and 35 of the isolating switch 3 and the negative output terminal 35, and the other end is electrically connected to the main circuit board 41 after passing through the second terminal through-hole 312; the third terminal 73 is a wire with a plug.

[0045] See Figure 1 、 Figure 3 、 Figure 5 and Figure 6The isolating switch 3 has a wire outlet hole 315 on the wire outlet end surface 319 on one side in the longitudinal direction of the housing 31, and a wire inlet hole 314 on the wire inlet end surface 320 on the other side in the longitudinal direction. The isolating switch 3 is provided with screw holes 316 and positioning holes 317 for fixing at the bottom of the housing 31. The bottom of the base 1 is provided with screw mounting holes 11 and positioning columns 12 that are paired with the screw holes 316 and positioning holes 317, respectively. The screws are sequentially passed through the screw mounting holes 11 of the base 1 and the screw holes 316 of the isolating switch 3 to fix the isolating switch 3 in the base 1, and the wire inlet hole 314 and wire outlet hole 315 on the isolating switch 3 are aligned with the base wire inlet hole 13 and base wire outlet hole 14 on the base 1.

[0046] like Figure 3 、 Figure 4 and Figure 6 As shown, the isolating switch 3 is provided with at least one first limiting assembly 36 on the side of the housing 31 facing the solid-state electronic module 4. The first limiting assembly 36 includes a first radiator limiting surface 361 located at the bottom for limiting the radiator 5, a main circuit board mounting surface 362 located at the top, and a screw fixing portion 363 passing through the first radiator limiting surface 361 and the main circuit board mounting surface 362. The base 1 is provided with a second limiting assembly 15 on the inner side wall facing the radiator 5, which cooperates with the first limiting assembly 36. The second limiting assembly 15 includes a second radiator limiting surface 151 located at the bottom for limiting the radiator 5, a main circuit board mounting buckle 152 extending inwardly from the top, and an upper cover mounting buckle 153 extending outwardly from the top. A third radiator limiting surface 17 is provided on the side of the base 1 away from the fan 6 in the longitudinal direction. The side wall of the fan mounting cavity facing the third radiator limiting surface 17 serves as a fourth radiator limiting surface 18. The third radiator limiting surface 17 and the fourth radiator limiting surface 18 cooperate to limit the installation of the radiator 5. After one side of the main circuit board 41 is clamped on the main circuit board mounting buckle 152 of the second limiting assembly 15, it rests on the main circuit board mounting surface 362 of the first limiting assembly 36. Screws are passed through the circuit board mounting hole 411 of the main circuit board 41, the screw fixing portion 363, and the radiator mounting hole 51 of the radiator 5 from top to bottom, and then the main circuit board 41, the radiator 5, and the isolating switch 3 are fixedly connected.

[0047] See you next time Figure 4 , and see Figure 8The base 1 has a base fan retaining groove 16 formed in its longitudinal direction on one side of the radiator 5, and the upper cover 2 has a cover fan retaining groove 21 formed on its upper cover 2 corresponding to the base fan retaining groove 16. The base fan retaining groove 16 and the cover fan retaining groove 21 cooperate to form a fan mounting cavity, and the fan 6 is mounted in the fan mounting cavity.

[0048] See Figure 4 、 Figure 7 , and combined with Figure 1 The main circuit board 41 is equipped with a solid-state electronic switch on its lower surface, secured to the heat sink 5 with screws, effectively dissipating heat. The base 1 and upper cover 2 are provided with base cooling holes 19 and upper cover cooling holes 27 on the sides facing the heat sink 5 and fan 6, respectively, forming a heat dissipation channel along the length of the switch. When the temperature reaches a certain range, the fan 6 accelerates air flow, further cooling the switch.

[0049] like Figure 1 、 Figure 8 As shown, the control panel 42 is located above the main circuit board 41 and is plugged into the main circuit board 41 via conductive pin headers. The operation display panel 43 is located above the control panel 42 and is electrically connected to the control panel 42 via a wiring harness. The wiring harness is used to convert electrical signals between the control panel 42 and the control panel 42. A control panel limiter 22 is provided within the upper cover 2, corresponding to the control panel 42. This is used to limit the control panel 42 and prevent it from vibrating and causing poor contact or falling off. An operation display panel limiter 23 is provided within the upper cover 2, corresponding to the operation display panel 43. Operation display panel mounting clips 24 are provided at intervals around the operation display panel limiter 23 to limit the installation of the operation display panel 43.

[0050] like Figure 1 、 Figure 7 As shown, the operation display panel 43 is provided with a pair of keys 431, a pair of first buttons 432, and a second button 433 on its upper surface. The first button 432 is triggered by operating the key 431. Specifically, the pair of keys 431 are located above the pair of first buttons 432, and the inner side of the key 431 is provided with a button triggering boss 4311. The key 431 is designed with a transparent or translucent material to provide uniform illumination. The upper cover 2 is also provided with a resilient key 28 for triggering the second button 433. The resilient key 28 adopts a cantilever structure to ensure effective triggering and release of the third button 433.

[0051] like Figures 1 to 3 and Figure 7 、 Figure 9As shown, the disconnector 3 is provided with a handle 37 on the top for operating the disconnecting contacts to open or close. The housing 31 is provided with an indicator window 318 on the top for indicating the contact closing and opening positions. The upper cover 2 is provided with a handle hole 25 and an indicator hole 26 corresponding to the disconnector 3.

[0052] like Figure 3 、 Figure 4 and Figure 9 As shown, the upper cover 2 is fixed to the base 1 through the upper cover connecting buckle 38 on the left side of the isolating switch 3 and the upper cover mounting buckle 153 on the base 1, and the handle 37 of the isolating switch 3 extends out of the upper cover 2 to achieve manual operation.

[0053] When the solid-state circuit breaker is put into operation, the current isolation contacts are closed using handle 37. This allows the control board 42 and main circuit board 41 to close the solid-state electronic switch when powered. When an overload or short-circuit current occurs in the circuit, the solid-state electronic switch quickly opens, then opens the current isolation contacts, quickly disconnecting the faulty circuit. By closing and then opening the current isolation contacts, the faulty circuit can be quickly disconnected and reliably isolated.

Claims

1. A solid-state circuit breaker, comprising a base (1) and an upper cover (2), wherein the base (1) and the upper cover (2) cooperate to form a housing, wherein an isolating switch (3) having isolating contacts and a solid-state electronic module (4) are provided in the housing, characterized in that: The isolating switch (3) and the solid-state electronic module (4) are arranged side by side along the width direction of the base (1); the solid-state electronic module (4) includes a main circuit board (41); the main circuit board (41) is provided with a solid-state electronic switch; the isolating switch (3) has a first terminal and a second terminal for connecting to an external connection; the first terminal, the isolating contact, the solid-state electronic switch, and the second terminal are electrically connected in series in sequence.

2. A solid-state circuit breaker according to claim 1, characterized in that: The isolating switch (3) has a housing (31), a first terminal through-hole (311) and a second terminal through-hole (312) are provided on the housing (31), an insulating partition (313) is provided between the first terminal through-hole (311) and the second terminal through-hole (312), a first terminal (71) and a second terminal (72) are provided on the line between the isolating contact and the first terminal or the second terminal, the first terminal (71) passes through the first terminal through-hole (311), and the second terminal (72) passes through the second terminal through-hole (312), and then is connected to the main circuit board (41), and is electrically connected to the solid-state electronic switch, thereby realizing a series electrical connection between the isolating contact and the solid-state electronic switch.

3. A solid-state circuit breaker according to claim 2, characterized in that: The isolating switch (3) further comprises negative input and output terminals (34, 35), and the isolating switch (3) comprises at least one set of isolating contacts, each of which is electrically connected between the positive input and output terminals (32, 33) and between the negative input and output terminals (34, 35), for realizing separation and closing and synchronous operation; the isolating switch (3) further comprises a third terminal (73) for drawing power from the negative pole of the main circuit board (41), one end of the third terminal (73) is electrically connected to the circuit between the isolating contacts between the negative input and output terminals (34, 35) of the isolating switch (3) and the negative output terminal (35), and the other end is electrically connected to the main circuit board (41) after passing through the second terminal through hole (312).

4. A solid-state circuit breaker according to claim 2, characterized in that: The device further comprises a radiator (5), wherein the radiator (5) and the isolating switch (3) are arranged side by side in the base (1) along the width direction of the base (1), the solid-state electronic module (4) is arranged above the radiator (5), and the isolating switch (3) and the radiator (5) and the main circuit board (41) are fixedly connected to each other.

5. A solid-state circuit breaker according to claim 2, characterized in that: The isolating switch (3) has a wire outlet hole (315) on the wire outlet end surface (319) on one side in the longitudinal direction of the housing (31), and a wire inlet hole (314) on the wire inlet end surface (320) on the other side in the longitudinal direction. The isolating switch (3) is provided with a screw hole (316) and a positioning hole (317) for fixing at the bottom of the housing (31); the bottom of the base (1) is provided with a screw mounting hole (11) and a positioning column (12) respectively matched with the screw hole (316) and the positioning hole (317). The screws are sequentially passed through the screw mounting hole (11) of the base (1) and the screw hole (316) of the isolating switch (3), and the isolating switch (3) is fixed in the base (1), and the wire inlet hole (314) and the wire outlet hole (315) on the isolating switch (3) are aligned with the base wire inlet hole (13) and the base wire outlet hole (14) on the base (1).

6. A solid-state circuit breaker according to claim 4, characterized in that: The isolating switch (3) is provided with at least one first limiting assembly (36) on one side of the housing (31) facing the solid-state electronic module (4), and the first limiting assembly (36) includes a first radiator limiting surface (361) located at the bottom for limiting the radiator (5), a main circuit board mounting surface (362) located at the top, and a screw fixing portion (363) passing through the first radiator limiting surface (361) and the main circuit board mounting surface (362); the base (1) is provided with a second limiting assembly (15) on the inner side wall facing the radiator (5) and cooperating with the first limiting assembly (36), and the second limiting assembly (15) includes a A second radiator limiting surface (151) for limiting the radiator (5), a main circuit board mounting buckle (152) extending inwardly from the top, and an upper cover mounting buckle (153) extending outwardly from the top; one side of the main circuit board (41) is clamped on the main circuit board mounting buckle (152) of the second limiting assembly part (15), and then abuts against the main circuit board mounting surface (362) of the first limiting assembly part (36); screws are sequentially inserted from top to bottom through the circuit board mounting hole (411) of the main circuit board (41), the screw fixing part (363), and the radiator mounting hole (51) of the radiator (5), thereby fixing the main circuit board (41), the radiator (5), and the isolating switch (3) in connection.

7. The solid-state circuit breaker according to claim 4, characterized in that: The invention also includes a fan (6). A base fan limiting groove (16) is provided in the base (1) at a position on one side of the radiator (5) in the length direction. A cover fan limiting groove (21) is provided on the cover (2) corresponding to the base fan limiting groove (16). The base fan limiting groove (16) and the cover fan limiting groove (21) are assembled to form a fan installation cavity. The fan (6) is installed in the fan installation cavity.

8. A solid-state circuit breaker according to claim 7, characterized in that: A third radiator limiting surface (17) is provided on a side of the base (1) away from the fan (6) in the length direction, and the side wall of the fan installation cavity facing the third radiator limiting surface (17) serves as a fourth radiator limiting surface (18). The third radiator limiting surface (17) and the fourth radiator limiting surface (18) cooperate to limit the installation of the radiator (5).

9. The solid-state circuit breaker according to claim 1, characterized in that: The solid-state electronic module (4) further comprises a control panel (42) and an operation display panel (43), wherein the control panel (42) is located above the main circuit board (41) and is plugged into the main circuit board (41) through a conductive pin header, and the operation display panel (43) is located above the control panel (42) and is electrically connected to the control panel (42) through a wiring harness; a control panel limiting boss (22) is provided in the upper cover (2) corresponding to the control panel (42) for limiting the control panel (42), an operation display panel limiting boss (23) is provided in the upper cover (2) corresponding to the operation display panel (43), and operation display panel mounting buckles (24) are provided at intervals around the operation display panel limiting boss (23) for limiting the mounting of the operation display panel (43).

10. The solid-state circuit breaker according to claim 2, characterized in that: The isolating switch (3) is provided with a handle (37) on the top for operating the isolating contacts to separate or close, and the housing (31) is provided with an indication window (318) on the top for indicating the contact closing and opening positions; the upper cover (2) is provided with a handle hole (25) and an indication hole (26) corresponding to the isolating switch (3).

11. The solid-state circuit breaker according to claim 9, characterized in that: The operation display panel (43) is provided with a key (431) and a first button (432) on the upper surface, and the first button (432) is triggered by operating the key (431); the key (431) is made of transparent or translucent material.

Images