CN220526852U - Zero arcing protector and circuit breaker - Google Patents

Abstract

Zero flash protector and circuit breaker, the circuit breaker includes zero flash protector, zero flash protector includes the explosion chamber and sets up the arc extinguishing bars piece in the explosion chamber, the explosion chamber is including two splint of relative setting, connect through the curb plate between the one end of two splint, the other end of two splint is to the direction bending connection that keeps away from each other has two to turn over the board, enclose into the arc extinguishing space that is used for holding the arc extinguishing bars piece between curb plate and two splint, the arc extinguishing bars piece is installed between two splint, two are turned over the board and are located relatively the both sides in arc extinguishing space, two are turned over the board and are equipped with the first spacing face that is used for installing zero flash protector, be equipped with the inlet port on the curb plate, the plane perpendicular to that the mounting plate is located turns over board, splint and arc extinguishing bars piece, be equipped with the second spacing face that is used for installing zero flash protector on the mounting plate, be equipped with on the second spacing face and be used for with second locating part complex spacing hole.

Description

Zero arcing protector and circuit breaker

Technical Field

The utility model relates to the field of piezoelectric devices, in particular to a zero arcing protection device and a circuit breaker.

Background

The breaker can produce electric arc when breaking, because the energy of electric arc is very big, only relies on the explosion chamber inside the breaker can't thoroughly extinguish electric arc, and remaining electric arc can be along the air flue blowout to binding post department, takes a large amount of incandescent metal particles simultaneously, if do not handle, destroys the insulating properties of binding post department easily to probably cause the incident.

Although the prior art can cut the residual electric arc and the cooling electric arc again by adding the zero-arcing shield and adding the metal grid plate in the zero-arcing shield, thereby achieving the purpose of extinguishing the electric arc. However, this method requires a separate new mold to produce the zero arcing shield, increasing production costs. In addition, the zero arcing shield installed outside the circuit breaker housing increases the length dimension of the circuit breaker.

Disclosure of Invention

The utility model aims to overcome at least one defect in the prior art and provides a zero-flashover protection device.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a zero arcing protector, includes the explosion chamber and sets up the arc extinguishing bars piece in the explosion chamber, the explosion chamber is including two splint that set up relatively, is connected through the curb plate between the one end of two splint, and the other end of two splint is to the direction bending connection that keeps away from each other has two to turn over the board, encloses into between curb plate and two splint and is used for holding the arc extinguishing spaces of arc extinguishing bars piece, and the arc extinguishing bars piece is installed between two splint, two are located relatively the both sides of arc extinguishing spaces are turned over to two and are equipped with the first spacing face that is used for installing zero arcing protector, be equipped with the inlet port on the curb plate, the curb plate bending connection has the mounting panel, and the plane perpendicular to that the mounting panel is located turns over board, splint and arc extinguishing bars piece, be equipped with the spacing hole on the mounting panel for installing zero arcing protector's the second spacing face.

Preferably, the side of turning over the board is equipped with the folded plate, be equipped with the third spacing face on the folded plate, the third spacing face is used for cooperating with the third locating part, and the third spacing face is perpendicular to first spacing face, and is parallel to the second spacing face.

Preferably, the side plate is arc-shaped, an arc-shaped avoiding space is formed on one side of the side plate facing the arc-extinguishing space, the avoiding space is communicated with the arc-extinguishing space, and the mounting plate is connected with the side edge of the top side of the side plate and extends towards the avoiding space.

Preferably, the turning plate is connected with the corresponding clamping plate through a connecting plate, the connecting plate is respectively arranged at an oblique angle with the turning plate and the clamping plate, and arc extinguishing holes are formed in the connecting plate.

Preferably, through holes are respectively formed in the two clamping plates, a plurality of baffles respectively extending into the arc extinguishing cavity are arranged in the through holes, the baffles are arranged at intervals, a blocking groove is formed between the adjacent baffles, and the arc extinguishing grid plates are used for being inserted into the blocking groove to be in limit fit.

Preferably, the two clamping plates are respectively provided with a limiting groove, the limiting grooves and the blocking grooves for limiting the same arc-extinguishing grating sheet are arranged on the same straight line, two opposite side edges of the arc-extinguishing grating sheet are respectively provided with a boss, and the bosses are used for being inserted into the limiting grooves and extend to the outer sides of the clamping plates from the limiting grooves to be riveted with the clamping plates.

Preferably, a plurality of arc-extinguishing grid plates are arranged in the arc-extinguishing space, arc-extinguishing holes are respectively formed in the arc-extinguishing grid plates, and the arc-extinguishing holes in two adjacent arc-extinguishing grid plates are arranged in a staggered mode.

Preferably, the side plate, the turning plate and the clamping plate are integrally formed.

According to the zero-arcing protection device, the U-shaped arc extinguishing space is formed by enclosing the side plates and the two clamping plates, the two turning plates are bent and connected at the end parts of the clamping plates in the direction away from each other, the mounting plate is bent and connected on the side plates, the first limiting surface and the second limiting surface which are perpendicular to each other are respectively arranged on the turning plates and the mounting plate, the zero-arcing protection device is simple in integral structure and low in cost, can be used for being installed on a terminal cover to form a zero-arcing cover, and can provide the terminal cover or the zero-arcing cover formed by the terminal cover with the zero-arcing protection device according to the needs of users, so that different needs of the users are met.

In addition, through set up the folded plate in the side of turning over the board, rethread third locating part is spacing with the folded plate, need not set up the connecting hole that replaces the third spacing face on turning over the board, when connecting reliably, can also reduce the volume, guarantees to adapt to current most terminal cover.

The utility model also provides a circuit breaker, which comprises the zero arcing protection device.

Preferably, the shell is provided with a terminal cover for protecting the wiring terminal, the terminal cover comprises a terminal cover side plate, a terminal cover top plate bent and connected with the side edge of the top side of the terminal cover side plate, and a plurality of terminal cover partition plates arranged in parallel at intervals and perpendicular to the side surface of the terminal cover side plate, one side of the terminal cover side plate, which is close to the wiring terminal, is provided with a first mounting surface matched with a first limiting surface of the zero arcing protection device, one side of the terminal cover top plate, which is close to the wiring terminal, is provided with a second mounting surface matched with a second limiting surface of the zero arcing protection device, and the second mounting surface is provided with a second limiting hole matched with a second limiting piece.

Preferably, the terminal cover further comprises a limit post connected with the top plate of the terminal cover, and a limit gap is formed between the limit post and the side plate of the terminal cover and used for inserting the turning plate.

Preferably, the spacing post is equipped with the spacing hole of third, and the third locating part is installed in the spacing downthehole of third, and the third locating part is equipped with perpendicular to the spacing hole axial spacing arch of third for with turning over the spacing cooperation of board, prevent the explosion chamber to the direction removal of keeping away from the terminal cover roof.

Preferably, the third limiting part is a screw, and the limiting protrusion is a nut of the screw.

The circuit breaker can directly use the terminal cover in the prior art, can also be provided with the zero-flashover protection device, does not need to design a new zero-flashover protection cover in a matching way, does not need to redesign and process a corresponding die for the zero-flashover protection cover, and can be used with a conventional terminal cover, so that the production cost is effectively reduced; and the zero arcing protection device is positioned inside the shell of the circuit breaker, so that the length dimension of the circuit breaker is not increased.

It is understood that the zero arcing protection device of the present utility model may not use the terminal cover of the prior art, or may be designed separately with a special terminal cover, or may use other protection covers of the prior art, which falls within the protection scope of the present utility model. Preferably, the second mounting surface is provided with an exhaust hole corresponding to the arc extinguishing cavity.

Drawings

Fig. 1 is a schematic structural view of a zero circuit breaker of the present utility model;

FIG. 2 is a schematic illustration of the mating of the terminal cover and zero arcing shield apparatus of the present utility model;

FIG. 3 is a schematic view of the structure of the zero arcing shield apparatus of the present utility model;

fig. 4 is a schematic structural view of an arc chute of the present utility model;

fig. 5 is a schematic view of the structure of an arc chute sheet of the present utility model;

FIG. 6 is a schematic view of the structure of the terminal cover of the present utility model;

fig. 7 is a schematic view of the mating of the arc chute and terminal cover of the present utility model;

fig. 8 is another schematic view of the mating of the arc chute and terminal cover of the present utility model;

fig. 9 is a cross-sectional view of the circuit breaker of the present utility model;

in the figure, 10, arc extinguishing chamber; 1. a clamping plate; 11. a through hole; 12. a baffle; 13. a blocking groove; 14. a limit groove; 15. a boss; 2. turning plate; 21. a first limiting surface; 22. a folded plate; 23. a third limiting surface; 3. a side plate; 30. an air inlet hole; 31. the second limiting surface; 32. an avoidance unit; 33. an avoidance space; 34. a mounting plate; 35. a connection part; 4. arc extinguishing grid plates; 40. arc extinguishing holes; 310. a limiting hole; 52. a second limiting piece; 53. a third limiting member; 61. a first mounting surface; 62. a second mounting surface; 63. a third mounting surface; 64. a housing; 65. a connection terminal; 66. a terminal cover; 661. a terminal cover side plate; 662. a terminal cover top plate; 663. a terminal cover separator; 664. a limit column; 7. a connecting plate;

Detailed Description

Embodiments of the zero arcing shield apparatus of the present utility model are further described below with reference to the examples shown in the drawings. The zero arcing shield apparatus of the present utility model is not limited to the description of the embodiments below.

As shown in fig. 2-8, the zero-arcing protection device of the utility model comprises an arc-extinguishing cover 10 and arc-extinguishing grid sheets 4 arranged in the arc-extinguishing cover 10, wherein the arc-extinguishing cover 10 comprises two clamping plates 1 which are oppositely arranged, one ends of the two clamping plates 1 are connected through a side plate 3, the other ends of the two clamping plates 1 are bent and connected with two turning plates 2 in a mutually far-away direction, an arc-extinguishing space for accommodating the arc-extinguishing grid sheets 4 is enclosed between the side plate 3 and the two clamping plates 1, the arc-extinguishing grid sheets 4 are arranged between the two clamping plates 1, the two turning plates 2 are oppositely arranged at two sides of the arc-extinguishing space, the two turning plates 2 are provided with first limiting surfaces 21 for installing the zero-arcing protection device, the side plate 3 is provided with an air inlet hole 30, the plane where the side plate 3 is arranged is perpendicular to the turning plates 2, the clamping plates 1 and the arc-extinguishing grid sheets 4, a second limiting surface 31 for installing the zero-arcing protection device is arranged on the mounting plate 34, and a limiting hole 310 for being matched with a second limiting piece 52 is arranged on the second limiting surface 31.

The zero arcing protection device is used for being mounted on a circuit breaker, in particular on a terminal cover 66 of the circuit breaker, a first mounting surface 61 and a second mounting surface 62 are arranged on the terminal cover 66, the arc extinguishing space is used for being reversely buckled on the first mounting surface 61, the second limiting piece 52 is used for being connected with the second mounting surface 62 through a limiting hole 310, the second limiting surface 31 is in limiting fit with the second mounting surface 62, the first limiting surface 21 is in limiting fit with the first mounting surface 61, and the zero arcing cover is formed.

As shown in fig. 1-2, the present utility model further provides an embodiment of the circuit breaker, which includes a housing 64 and a zero arcing protection device mounted on the housing 64, wherein a terminal cover 66 for protecting a connection terminal 65 is provided on the housing 64, and the first mounting surface 61 and the second mounting surface 62 are respectively provided on the terminal cover 66.

The zero arcing protector of this embodiment encloses into the arc extinguishing space of U type through curb plate 3 and two splint 1 between, buckles to be connected with two and turns over board 2 to the direction that keeps away from each other at the tip of splint, buckles on curb plate 3 and is connected with mounting panel 34 to set up mutually perpendicular's first spacing face 21 and second spacing face 31 respectively at turning over board 2 and mounting panel 34, zero arcing protector overall structure is simple with low costs, can be used to install and constitute zero arcing cover on terminal cover 66, can provide the terminal cover or have zero arcing cover that zero arcing protector's terminal cover constitutes according to the user's needs, satisfies user's different demands.

The circuit breaker of the utility model can directly use the terminal cover 66 in the prior art, can also be provided with the zero-flashover protection device, does not need to design a new zero-flashover protection cover in a matching way with the zero-flashover protection device, does not need to redesign and process a corresponding mould for the zero-flashover protection cover, and can be universal with the conventional terminal cover 66, thereby effectively reducing the production cost. It is understood that the zero arcing shield apparatus of the present utility model may not use the terminal cover 66 of the prior art, or may be designed with a special terminal cover 66 alone, or may use other protection covers of the prior art, which are all within the scope of the present utility model. Preferably, the second mounting surface 62 is provided with an exhaust hole corresponding to the arc extinguishing chamber.

As shown in fig. 1-2, the terminal cover 66 includes a terminal cover side plate 661, a terminal cover top plate 662 connected with a side edge of a top side of the terminal cover side plate 661 in a bending manner, and a plurality of parallel terminal cover separators 663 arranged at intervals and perpendicular to a side surface of the terminal cover side plate 661, a zero-flashover protection space for installing the zero-flashover protection device is formed between adjacent terminal cover separators 663, a first installation surface 61 matched with a first limit surface 21 of the zero-flashover protection device is arranged on a side of the terminal cover side plate 661 close to the wiring terminal 65, a second installation surface 62 matched with a second limit surface 31 of the zero-flashover protection device is arranged on a side of the terminal cover top plate 662 close to the wiring terminal 65, a second limit hole matched with the second limit piece 52 is formed in the second installation surface 62, a side surface of the terminal cover side plate 661 is the first installation surface 61, and an inner side surface of the terminal cover top plate 662 is the second installation surface 62.

As shown in fig. 3-4, the arc extinguishing chamber 10 includes two opposite clamping plates 1, one ends of the two clamping plates 1 are connected by a side plate 3, and the other ends of the two clamping plates 1 are bent and connected with two turning plates 2 in a direction away from each other; an arc extinguishing space for accommodating the arc extinguishing grating sheet 4 is enclosed between the side plate 3 and the two clamping plates 1, the arc extinguishing grating sheet 4 is arranged between the two clamping plates 1, the arc extinguishing grating sheet 4 is connected with the two clamping plates 1, and the clamping plates 1 are provided with clamping grooves or clamping hooks which are clamped with the arc extinguishing grating sheet 4. The turning plates 2 are basically vertical to the clamping plate 1, the two turning plates 2 are oppositely arranged at two sides of the arc extinguishing space, and the two turning plates 2 are provided with first limiting surfaces 21 for being connected with a terminal cover 66 of the circuit breaker; the side plate 3 is a flat plate or is bent into a circular arc shape, preferably the side plate 3 is in a circular arc shape, and a plurality of air inlets 30 are formed in the side plate 3; the upper side edge of the side plate 3 is bent and connected with a mounting plate 34, and the plane where the mounting plate 34 is positioned is perpendicular to the turning plate 2, the clamping plate 1 and the arc extinguishing grid sheet 4; the mounting plate 34 is provided with a second limiting surface 31 for connecting with the terminal cover 66, the second limiting surface 31 is perpendicular to the first limiting surface 21, the second limiting surface 31 is provided with a limiting hole 310 matched with the second limiting piece 52,

as shown in fig. 2 and 7-8, when the arc extinguishing chamber is installed, the arc extinguishing space of the arc extinguishing chamber 10 is reversely buckled on the terminal cover side plate 661 of the terminal cover 66, the first limiting surface 21 on the turning plate 2 is correspondingly installed with the first installation surface 61 on the terminal cover side plate 661, the installation plate 34 is correspondingly installed with the terminal cover top plate 662, the second limiting piece 52 passes through the limiting hole 310 to be connected with the second installation surface 62, the arc extinguishing chamber 10 is fixed with the terminal cover 66 by being screwed on the second limiting hole as a second limiting piece 52 through the limiting hole 310 through a screw, and the first limiting surface 21 is in limiting fit with the first installation surface 61.

Preferably, the turning plate 2 and the terminal cover side plate 661 are also fixed by a limiting member. For example, a fourth limiting hole is formed in the turning plate 2 and is fixed through a screw. However, since the terminal cover side plate 661 is thin, the terminal cover side plate 661 is easily broken when the screw is screwed, and the screw is too close to the terminal, which is also unsafe. Preferably, the terminal cover 66 further includes a limit post 664 connected to the terminal cover top plate 662, and a limit gap is provided between the limit post 664 and the terminal cover side plate 661, for inserting the flap 2. As shown in fig. 2, the arc extinguishing chamber 10 is inserted from a side away from the terminal cover top plate 662 toward a side close to the terminal cover top plate 662, and the flap 2 is inserted into the limit gap.

Preferably, the limiting post 664 is provided with a third limiting hole, a screw serving as a third limiting piece 53 is installed in the third limiting hole, and the third limiting piece 53 is provided with a limiting protrusion perpendicular to the axial direction of the third limiting hole and used for being in limiting fit with the turning plate 2 to prevent the arc extinguishing chamber 10 from moving in a direction away from the top plate 662 of the terminal cover. The limiting protrusion is a nut of a screw and is in limiting fit with a third limiting surface 23 on the turning plate 2.

As shown in fig. 3 to 7, a folded plate 22 is disposed on a side surface of the folded plate 2, a third limiting surface 23 matched with the third limiting member 53 is disposed on the folded plate 22, the third limiting surface 23 is perpendicular to the first limiting surface 21 and parallel to the second limiting surface 31, and is matched with the third limiting member 53, so as to prevent the arc extinguishing chamber 10 from moving in a direction away from the top plate 662 of the terminal cover. The third limiting member 53 is disposed parallel to the second limiting member 52, the third limiting member 53 is configured to limit the third limiting surface 23, in this embodiment, the third limiting member 53 is a screw, the third limiting surface 23 abuts against a nut of the screw to limit, and the third limiting member 53 makes the other side of the folded plate 22 abut against the third mounting surface 63 at the end of the limiting post 664. By arranging the folded plate 22 on the side surface of the folded plate 2 and limiting the folded plate 22 with the third mounting surface 63 through the third limiting piece 53, the connection hole is not required to be arranged on the folded plate 2, the volume can be reduced while the connection is reliable, and the existing plurality of terminal covers 66 can be ensured to be adapted. The third limiting surface 23 may also be a side edge of the bottom side of the flap 2.

Preferably, as shown in fig. 3-4, the turning plate 2 is connected with the corresponding clamping plate 1 through the connecting plate 7, the connecting plate 7 is respectively arranged at an oblique angle with the turning plate 2 and the clamping plate 1, the connecting plate 7 is provided with the arc extinguishing hole 40, the connecting plate 7 can also play the same arc extinguishing role with the arc extinguishing grid plate 4 through the arc extinguishing hole 40 on the basis of connecting the turning plate 2 with the clamping plate 1, and particularly, the connecting plate 7 is positioned at the outer side of the arc extinguishing cavity, so that flashover in a gap outside the arc extinguishing cavity can be eliminated, and a better arc extinguishing effect is achieved. The connecting plate 7 of this embodiment is provided with a plurality of arc extinguishing holes 40.

As shown in fig. 3-4, the side plate 3 of this embodiment is circular arc, the side plate 3 forms a circular arc shaped avoiding space 33 at one side facing the arc extinguishing space, the avoiding space 33 is communicated with the arc extinguishing space, the arc extinguishing space can be enlarged and used for avoiding the second limiting member 52, and the mounting plate 34 is connected with the top side edge of the side plate 3 and extends towards the avoiding space 33. The side plate 3 comprises at least two avoidance portions 32 which are arranged in an oblique angle manner, the at least two avoidance portions 32 are respectively connected with the two clamping plates 1, an avoidance space 33 is formed by surrounding between the at least two avoidance portions 32, the side plate 3 further comprises a mounting plate 34 arranged on one side of the avoidance space 33, and the limiting holes 310 are formed in the mounting plate 34. The avoidance space 33 is used for avoiding the second limiting member 52 and a tool for screwing the second limiting member 52, such as a screwdriver, firstly, the second limiting member 52 passes through the avoidance space 33 to be aligned with the connection position on the second limiting surface 31, then the screwdriver passes through the avoidance space 33, and the second limiting member 52 is screwed by the screwdriver, so that the screw-on-screw type screwdriver has the characteristic of convenience in assembly and disassembly.

Further, the side plate 3 further includes a connecting portion 35 connected between the at least two avoidance portions 32, the connecting portion 35 is provided with a mounting plate 34 on a side surface close to the arc extinguishing space, and an avoidance space 33 communicated with the arc extinguishing cavity is enclosed between the connecting portion 35 and the two avoidance portions 32. Of course, the side plate 3 may not be provided with the connecting portion 35, and the two avoiding portions 32 may be directly connected. In addition, the two avoidance portions 32 may be other polygons or arcs, and the use of arcs is equivalent to the arrangement of infinite number of avoidance portions 32, which are all within the scope of the present utility model.

As shown in fig. 3-4, through holes 11 are respectively formed in the two clamping plates 1, a plurality of baffle plates 12 respectively extending into the arc extinguishing cavity are arranged in the through holes 11, the baffle plates 12 are arranged at intervals, a blocking groove 13 is formed between the adjacent baffle plates 12, and the arc extinguishing grid plates 4 are used for being inserted into the blocking groove 13 to be in limit fit.

As shown in fig. 3-5, the two clamping plates 1 are respectively provided with a limiting groove 14, the limiting grooves 14 and the blocking grooves 13 for limiting the same arc extinguishing grating sheet 4 are arranged on the same straight line, two opposite side edges of the arc extinguishing grating sheet 4 are respectively provided with a boss 15, and the bosses 15 are used for being inserted into the limiting grooves 14 and extending to the outer side of the clamping plate 1 from the limiting grooves 14 to be riveted with the clamping plate 1. Of course, the arc extinguishing bars 4 may be connected to the clamping plates 1 by other manners instead of riveting, such as clamping jaws and buckles, etc., which are all within the scope of the present utility model.

Preferably, the side plate 3, the turning plate 2, the clamping plate 1 and the connecting plate 7 are integrally formed, and the novel integrated circuit board has the characteristics of simple structure, convenience in processing and low cost. And the whole has good elasticity, and is not easy to damage in the transportation and assembly processes.

As shown in fig. 3, 5 and 9, a plurality of arc-extinguishing grid plates 4 are arranged in the arc-extinguishing space, arc-extinguishing holes 40 are respectively arranged on the plurality of arc-extinguishing grid plates 4, and the arc-extinguishing holes 40 on two adjacent arc-extinguishing grid plates 4 are arranged in a staggered manner, so that the contact area between flashover and the arc-extinguishing grid plates 4 can be increased, and the capability of extinguishing an arc is further improved.

It should be noted that, in the description of the present utility model, the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate an orientation or a positional relationship based on that shown in the drawings or an orientation or a positional relationship conventionally put in use, and are merely for convenience of description, and do not indicate that the apparatus or element to be referred to must have a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating relative importance.

The foregoing is a further detailed description of the utility model in connection with the preferred embodiments, and it is not intended that the utility model be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the utility model, and these should be considered to be within the scope of the utility model.

Claims (13)

1. The utility model provides a zero flashover protector, includes explosion chamber (10) and sets up arc extinguishing bars piece (4) in explosion chamber (10), its characterized in that: the arc-extinguishing cover (10) comprises two clamping plates (1) which are oppositely arranged, one ends of the two clamping plates (1) are connected through side plates (3), the other ends of the two clamping plates (1) are bent and connected with two turning plates (2) in the direction away from each other, an arc-extinguishing space for accommodating arc-extinguishing grid plates (4) is enclosed between the side plates (3) and the two clamping plates (1), the arc-extinguishing grid plates (4) are installed between the two clamping plates (1), the two turning plates (2) are oppositely arranged on two sides of the arc-extinguishing space, the two turning plates (2) are provided with first limiting surfaces (21) for installing zero-flashover protection devices, air inlet holes (30) are formed in the side plates (3), the side plates (3) are bent and connected with mounting plates (34), the plane where the mounting plates (34) are located is perpendicular to the turning plates (2), the clamping plates (1) and the arc-extinguishing grid plates (4), second limiting surfaces (31) for installing the zero-flashover protection devices are arranged on the mounting plates (34), and limiting holes (310) are formed in the second limiting surfaces (31).

2. The zero arcing shield arrangement of claim 1, wherein: the side of turning over board (2) is equipped with folded plate (22), be equipped with third spacing face (23) on folded plate (22), third spacing face (23) are used for cooperating with third locating part (53), and third spacing face (23) perpendicular to first spacing face (21), and are on a parallel with second spacing face (31).

3. The zero arcing shield arrangement of claim 1, wherein: the side plate (3) is arc-shaped, an arc-shaped avoidance space (33) is formed on one side of the side plate (3) facing the arc-extinguishing space, the avoidance space (33) is communicated with the arc-extinguishing space, and the mounting plate (34) is connected with the side edge of the top side of the side plate (3) and extends towards the avoidance space (33).

4. The zero arcing shield arrangement of claim 1, wherein: the turning plate (2) is connected with the corresponding clamping plate (1) through a connecting plate (7), the connecting plate (7) is respectively arranged at an oblique angle with the turning plate (2) and the clamping plate (1), and arc extinguishing holes (40) are formed in the connecting plate (7).

5. The zero arcing shield arrangement of claim 1, wherein: the two clamping plates (1) are respectively provided with a through hole (11), a plurality of baffles (12) which respectively extend into the arc extinguishing cavity are arranged in the through holes (11), the baffles (12) are arranged at intervals, a blocking groove (13) is formed between the adjacent baffles (12), and the arc extinguishing grid plates (4) are used for being inserted into the blocking groove (13) in a limiting fit mode.

6. The zero arcing shield arrangement of claim 5, wherein: the two clamping plates (1) are respectively provided with a limiting groove (14), the limiting grooves (14) and the blocking grooves (13) for limiting the same arc-extinguishing grid plate (4) are arranged on the same straight line, two opposite side edges of the arc-extinguishing grid plate (4) are respectively provided with a boss (15), and the bosses (15) are used for being inserted into the limiting grooves (14) and extend to the outer side of the clamping plates (1) from the limiting grooves (14) to be riveted with the clamping plates (1).

7. The zero arcing shield arrangement of claim 1, wherein: a plurality of arc-extinguishing grid plates (4) are arranged in the arc-extinguishing space, arc-extinguishing holes (40) are respectively formed in the arc-extinguishing grid plates (4), and the arc-extinguishing holes (40) on two adjacent arc-extinguishing grid plates (4) are arranged in a staggered mode.

8. The zero arcing shield arrangement of claim 1, wherein: the side plates (3), the turning plate (2) and the clamping plate (1) are integrally formed.

9. A circuit breaker, characterized in that: comprising a housing (64) and a zero arcing shield according to any of the claims 1-8 mounted on the housing (64).

10. The circuit breaker according to claim 9, characterized in that: the novel high-voltage power supply is characterized in that a terminal cover (66) for protecting the wiring terminal (65) is arranged on the shell (64), the terminal cover (66) comprises a terminal cover side plate (661), a terminal cover top plate (662) connected with the side edge of the top side of the terminal cover side plate (661) in a bending mode, and a plurality of terminal cover partition plates (663) which are arranged in parallel and at intervals and are perpendicular to the side face of the terminal cover side plate (661), a first mounting face (61) matched with a first limiting face (21) of the zero-arcing protective device is arranged on one side, close to the wiring terminal (65), of the terminal cover top plate (662), a second mounting face (62) matched with a second limiting face (31) of the zero-arcing protective device is arranged on one side, close to the wiring terminal (65), and a second limiting hole matched with a second limiting piece (52) is arranged on the second mounting face (62).

11. The circuit breaker according to claim 10, characterized in that: the terminal cover (66) further comprises a limit post (664) connected with the terminal cover top plate (662), and a limit gap is formed between the limit post (664) and the terminal cover side plate (661) and used for inserting the turning plate (2).

12. The circuit breaker of claim 11, wherein: the limiting post (664) is provided with a third limiting hole, the third limiting piece (53) is arranged in the third limiting hole, the third limiting piece (53) is provided with a limiting protrusion perpendicular to the axial direction of the third limiting hole and used for being in limiting fit with the turning plate (2) to prevent the arc extinguishing cover (10) from moving in the direction away from the top plate (662) of the terminal cover.

13. The circuit breaker according to claim 12, wherein: the third limiting piece (53) is a screw, and the limiting protrusion is a nut of the screw.