Miniature RCBO circuit breaker

Abstract

The invention discloses a small RCBO circuit breaker, which comprises a circuit breaker shell, an arc extinguishing mechanism, a bimetallic strip, a magnetic coil and a trigger assembly, the arc extinguishing mechanism comprises an arc chute and a runway type arc extinguishing sheet, a static contact rod comprises a static contact, a U-shaped breaking part, an arc striking part and an arc guide plate, and the inclination angle of the arc striking part is opposite to the angle of the runway type arc extinguishing sheet relative to the arc chute; the trigger assembly is further provided with a bimetallic pull rod, the bimetallic pull rod is installed on the trigger assembly through a pin, the other end of the bimetallic pull rod is provided with a pull plate matched with the bimetallic strip, the circuit breaker shell is further provided with a guide shaft, the bimetallic pull rod is further provided with a kidney-shaped hole, and the guide shaft and the pin slide in the kidney-shaped hole to limit excessive movement of the bimetallic pull rod. According to the small RCBO circuit breaker, by improving the contact assembly, the arc extinguishing breaking capacity is improved, the internal structure arrangement is optimized, the production cost is reduced, the material utilization rate is increased, better use requirements can be provided, and the overall stability is high.

Description

Technical Field

[0001] The present invention relates to the field of electrical appliances, and more particularly, to a small RCBO circuit breaker. Background Art

[0002] For the power supply of the rural distribution network, the problem is that the awareness of electricity safety among rural residents is weak, and it is difficult to strictly install and lay the lines according to the standard requirements, resulting in live electricity at the power consumption end, making the protection at the end of power consumption unable to operate normally. Therefore, the RCBO leakage protection circuit breaker with overload, short - circuit and leakage protection functions has become a common means of end protection. The leakage protection circuit breaker has the functions of both a circuit breaker and a leakage protector. Therefore, the leakage protection circuit breaker is a commonly used protection device in electrical circuits, and is widely used in mobile electrical equipment and hand - held power tools; electrical equipment installed in harsh places such as humid and strongly corrosive environments; electrical construction machinery and equipment at construction sites; socket circuits in buildings such as schools, enterprises, and residences; underwater lighting equipment in swimming pools, fountains, and bathtubs; power supply lines and equipment installed in water; electrical medical equipment in hospitals that directly contacts the human body, etc.

[0003] In the prior art, the internal structure of the RCBO circuit breaker is designed by each manufacturer according to actual needs. However, for various existing RCBO circuit breakers, there is still a problem of low utilization rate of the internal structure. The components rely on a single fixing method. Especially for the arc - extinguishing structure components, once loosening occurs, it is easy to affect the arc - extinguishing effect and cause equipment damage problems. In addition, the utilization rate of materials for the old products is relatively simple. For cost control and performance improvement, therefore, new structures and new processes need to be developed in all aspects to meet the requirements of cost control and product performance improvement. Summary of the Invention

[0004] The purpose of the present invention is to provide a small RCBO circuit breaker, which improves the arc - extinguishing and breaking ability by improving the contact component, optimizes the internal structure setting, reduces the production cost, improves the material utilization rate, and can meet better usage requirements with strong overall stability.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows: A small RCBO circuit breaker includes a circuit breaker housing, an arc extinguishing mechanism, a bimetal sheet, a magnetic coil, and a trigger assembly. The arc extinguishing mechanism includes an arc extinguishing grid and a runway-type arc extinguishing sheet. The trigger assembly is connected with a moving contact. A static contact rod is connected to the magnetic yoke of the magnetic coil, and a static contact is further provided on the static contact rod. The static contact rod includes a U-shaped breaking part protruding towards the runway-type arc extinguishing sheet. An arc leading part and an arc guiding plate parallel to the upper end of the arc extinguishing grid are extended from the U-shaped breaking part towards the arc extinguishing grid. The inclination angle of the arc leading part is set opposite to the angle of the runway-type arc extinguishing sheet relative to the arc extinguishing grid. A bimetal pull rod is further provided on the trigger assembly. The bimetal pull rod is installed on the trigger assembly through a pin, and the other end thereof is provided with a pull plate for cooperating with the bimetal sheet. A guide shaft is further provided on the circuit breaker housing, and a waist-shaped hole is further provided on the bimetal pull rod. The guide shaft and the pin are slidably located in the waist-shaped hole to limit the excessive movement of the bimetal pull rod.

[0006] As a further setting of the above solution, the arc extinguishing grid includes a plurality of arc extinguishing covers on both sides and a plurality of grid pieces fixed on the arc extinguishing covers on both sides. The top and bottom of the arc extinguishing grid are enclosed by the arc guiding plate and the runway-type arc extinguishing sheet in an embedded manner.

[0007] As a further setting of the above solution, a clamping plate is provided at intervals at the rear end of the arc extinguishing grid, an air flow channel is provided at the rear side of the clamping plate, and a missing hole communicated with the air flow channel is provided on the circuit breaker housing.

[0008] As a further setting of the above solution, an indicating port is further provided on the circuit breaker housing, an indicating member is further provided on the trigger assembly, the indicating member is arranged opposite to the indicating port, and the indicating member is used to correspond to the triggering position of the trigger assembly.

[0009] As a further setting of the above solution, near-arc grooves are provided on the opposite surfaces of the runway-type arc extinguishing sheet and the U-shaped breaking part, the arc leading part, and the arc guiding plate of the static contact rod, and the near-arc grooves provided on the runway-type arc extinguishing sheet and the static contact rod are opposite to each other.

[0010] As a further setting of the above solution, installation hooks are provided at the ends of both the runway-type arc extinguishing sheet and the arc guiding plate. An adjusting card slot is further provided on the runway-type arc extinguishing sheet, and the adjusting card slot is correspondingly arranged with a block on the arc extinguishing grid.

[0011] As a further setting of the above solution, inserting plate pieces are provided on both the runway-type arc extinguishing sheet, the magnetic yoke, and the static contact rod. A positioning slot is provided on the circuit breaker housing, and the inserting plate pieces are inserted into the positioning slot in a relative manner.

[0012] As a further setting of the above solution, the static contact rod is separately provided from the magnetic yoke, and a plurality of buckles are provided at the abutted part thereof for limiting and fixing the static contact rod and the magnetic yoke.

[0013] Beneficial effects: The present invention provides a small RCBO circuit breaker. By setting a split static contact rod and a magnetic yoke, the processing difficulty is reduced, the utilization rate of raw materials is improved, and the cost is reduced. The housing cavity and the internal arc extinguishing structure are improved. A U-shaped static contact rod is set to improve the breaking capacity. A runway-shaped arc extinguishing piece with a near-arc groove is set, and an arc extinguishing chamber structure set with eleven grid pieces is matched to better achieve arc extinguishing protection. A new bimetallic pull rod mechanism is designed, and a pin and a metal pull rod are used to replace the plastic pull rod in the prior art, reducing the processing technology difficulty and improving the product performance. In addition, support pieces are cooperatively arranged on the outer shell and the contact component to increase the indication function, facilitating the direct observation of the internal triggering action by the staff. The RCBO circuit breaker of the present invention develops a new internal setting structure in response to customer requirements and cost control, improves the contact component to enhance the arc extinguishing and breaking capacity, can meet better usage requirements, and has strong overall stability. Description of the Drawings

[0014] Figure 1 It is a schematic diagram of the external structure of the circuit breaker of the present invention.

[0015] Figure 2 It is a schematic diagram of the internal structure of the circuit breaker of the present invention.

[0016] Figure 3 It is a schematic diagram of the side view structure of the circuit breaker of the present invention.

[0017] Figure 4 It is a schematic diagram of the installation structure of the circuit breaker housing and the bimetallic pull rod of the present invention.

[0018] Figure 5 It is a schematic diagram of the runway-shaped arc extinguishing piece and the static contact rod structure of the present invention.

[0019] Figure 6 For the present invention Figure 3 Partial enlarged schematic diagram of the arc extinguishing structure.

[0020] Reference numerals: 1. Circuit breaker housing; 10. Positioning slot; 11. Guide shaft; 12. Indication port; 2. Arc extinguishing mechanism; 21. Arc extinguishing grid; 211. Clamping plate; 212. Air flow channel; 213. Missing hole; 22. Runway-shaped arc extinguishing piece; 23. Adjusting card slot; 24. Block; 25. Arc extinguishing cover; 26. Grid piece; 3. Bimetallic sheet; 4. Magnetic coil; 40. Insertion plate piece; 41. Magnetic yoke; 42. Static contact rod; 43. Static contact; 44. U-shaped breaking part; 45. Arc leading part; 46. Button; 47. Arc guiding plate; 48. Installation hook; 49. Near-arc groove; 5. Trigger assembly; 50. Bimetallic pull rod; 51. Moving contact; 52. Pulling plate; 53. Waist-shaped hole; 54. Pin; 59. Indication piece. Detailed Embodiments

[0021] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0022] As shown in Figures 1-6 a small RCBO circuit breaker, which includes a circuit breaker housing 1, an arc extinguishing mechanism 2, a bimetal 3, a magnetic coil 4 and a trigger assembly 5. The arc extinguishing mechanism 2 includes an arc extinguishing grid 21 and a runway-shaped arc extinguishing piece 22. The trigger assembly 5 is connected with a moving contact 51. A static contact rod 42 is connected to the magnetic yoke 41 of the magnetic coil 4. A static contact 43 is further arranged on the static contact rod 42. And the static contact rod 42 includes a U-shaped breaking part 44 protruding towards the runway-shaped arc extinguishing piece 22. An arc leading part 45 is extended from the U-shaped breaking part 44 towards the arc extinguishing grid 21 and an arc guiding plate 47 parallel to the upper end of the arc extinguishing grid 21. The inclination angle of the arc leading part 45 is arranged opposite to the angle of the runway-shaped arc extinguishing piece 22 relative to the arc extinguishing grid 21. A bimetal pull rod 50 is further arranged on the trigger assembly 5. The bimetal pull rod 50 is installed on the trigger assembly 5 through a pin 54. The other end thereof is provided with a pull plate 52 which is arranged in cooperation with the bimetal 3. A guide shaft 11 is further arranged on the circuit breaker housing 1. A waist-shaped hole 53 is further arranged on the bimetal pull rod 50. The guide shaft 11 and the pin 54 are slidably located in the waist-shaped hole 53 to limit the excessive movement of the bimetal pull rod 50.

[0023] As a further setting of the above solution, the arc extinguishing grid 21 includes a plurality of arc extinguishing covers 25 on both sides and a plurality of grid pieces 26 fixed on the arc extinguishing covers 25 on both sides. The top and bottom of the arc extinguishing grid 21 are enclosed by the arc guiding plate 47 and the runway-shaped arc extinguishing piece 22 in an embedded manner.

[0024] As a further setting of the above solution, a clamping plate 211 is arranged at intervals at the rear end of the arc extinguishing grid 21. An air flow channel 212 is arranged at the rear side of the clamping plate 211. A missing hole 213 communicated with the air flow channel 212 is arranged on the circuit breaker housing 1. As shown in Figure 2 and Figure 3 the design of the air flow channel 212 in the embodiment of the present invention shown. The air flow channel 212 is communicated with the arc extinguishing chamber position of the arc extinguishing grid 21. When the air expands due to the appearance of an arc inside, it can not only serve as an air ejection flow channel, but also provide a heat dissipation hole for the high heat in the arc extinguishing chamber. The design of the air flow channel 212 has an inclined arc. When an arc appears, based on the moving direction of the arc guided by the runway-shaped arc extinguishing piece 22, the formed air flow pressure will further give a driving force to the high-temperature air flow heating the internal arc, and push the high-temperature air flow out of the missing hole 213 along the air flow channel 212 to reduce the content of high-temperature air inside and improve the cooling of the arc extinguishing grid 21.

[0025] As a further setting of the above solution, an indicating port 12 is further provided on the circuit breaker housing 1, and an indicating member 59 is further provided on the trigger assembly 5. The indicating member 59 is arranged opposite to the indicating port 12, and the indicating member 59 is used to correspond to the trigger position of the trigger assembly 5.

[0026] As a further setting of the above solution, near-arc grooves 49 are provided on the opposite surfaces of the runway-shaped arc extinguishing piece 22, the U-shaped breaking part 44, the arc leading part 45 and the arc guiding plate 47 of the static contact rod 42. The near-arc grooves 49 provided on the runway-shaped arc extinguishing piece 22 and the static contact rod 42 are opposite to each other.

[0027] As a further setting of the above solution, mounting hooks 48 are provided at the ends of both the runway-shaped arc extinguishing piece 22 and the arc guiding plate 47. An adjusting card slot 23 is further provided on the runway-shaped arc extinguishing piece 22, and the adjusting card slot 23 is correspondingly arranged opposite to the clamping block 24 on the arc extinguishing grid 21.

[0028] As a further setting of the above solution, inserting plate pieces 40 are provided on the runway-shaped arc extinguishing piece 22, the magnetic yoke 41 and the static contact rod 42. A positioning slot 10 is provided on the circuit breaker housing 1, and the inserting plate piece 40 is inserted into the positioning slot 10 correspondingly.

[0029] As a further setting of the above solution, the static contact rod 42 and the magnetic yoke 41 are separately arranged, and a number of buckles 46 are provided at the abutted part therebetween. The buckles 46 are used for limiting and fixing the static contact rod 42 and the magnetic yoke 41.

[0030] Embodiment: Refer to Figure 1 the RCBO circuit breaker of the present invention shown in the figure. From the external structure, it includes a circuit breaker housing 1 with an indicating port 12 and an indicating member 59 that can be observed from the indicating port 12. The indicating member 59 is linked with the trigger assembly 5 to realize the indication of the on / off state of the switch; Refer to Figures 2-3 the figure shown. Inside the circuit breaker housing 1, there are provided an arc extinguishing mechanism 2, a bimetallic strip 3, a magnetic coil 4 and a trigger assembly 5. Among them, the arc extinguishing mechanism 2 includes an arc extinguishing grid 21 composed of an arc extinguishing cover 25 and grid pieces 26. On the opening side of the grid pieces 26 of the arc extinguishing grid 21, a runway-shaped arc extinguishing piece 22 and a static contact rod 42 are provided, as Figure 3The runway-type arc extinguishing piece 22 and the static contact rod 42 shown are arranged above and below the arc extinguishing grid 21, and are used to stretch the arc length and are symmetrically arranged on the inclined plane. This structural design enables the arc generated at the driven contact 51 and the static contact 43 to be evenly stretched at the inclined section of the runway-type arc extinguishing piece 22 and the static contact rod 42 after passing through the U-shaped breaking part 44 and the runway-type arc extinguishing piece 22, and then enter the arc extinguishing grid 21. Based on the inclined structure of the mirror pair, after the arc is stretched, it enters the arc extinguishing grid 21, and the contact with the multiple grid pieces 26 is more uniform, which can better connect the arc into the arc extinguishing grid 21, reduce the local concentration problem, avoid the local vulnerability of the arc extinguishing grid 21 caused by arc concentration, and improve the service life of the arc extinguishing grid 21.

[0031] Furthermore, the static contact rod 42 extending from the magnetic coil 4 part adopts a structure separated from the magnetic yoke 41 in the embodiment of the present invention compared with the prior art. A plurality of buckles 46 are arranged on the static contact rod 42 to cooperate with the magnetic yoke 41 for positioning. The setting of splitting the magnetic yoke 41 and the static contact rod 42 into a split structure can not only reduce the processing difficulty, but also improve the material utilization rate and reduce the cost.

[0032] In addition, the static contact rod 42 in this embodiment includes a static contact 43 arranged opposite to the moving contact 51. A U-shaped breaking part 44 with a radian and protruding relative to the runway-type arc extinguishing piece 22 is arranged behind the static contact 43. The purpose of the U-shaped protrusion is to reduce the distance from the runway-type arc extinguishing piece 22, so that the arc can be more easily transferred from the moving contact 51 when the arc is generated. As the above U-shaped structure setting, the breaking ability between the moving contact 51 and the static contact rod 42 can be improved, making the arc extinguishing of the circuit breaker in this embodiment safer.

[0033] Reference Figures 3-4 In the embodiment of the present invention referred to, the moving contact 51 is connected to the trigger assembly 5, and a bimetallic pull rod 50 is further arranged on the trigger assembly 5. The bimetallic pull rod 50 is installed on the trigger assembly 5 through a pin 54, and the other end thereof is provided with a pull plate 52 to cooperate with the bimetallic strip 3. A guide shaft 11 is further arranged on the circuit breaker housing 1, and a waist-shaped hole 53 is arranged on the bimetallic pull rod 50. The guide shaft 11 and the pin 54 are slidably located in the waist-shaped hole 53 to limit the excessive movement of the bimetallic pull rod 50.

[0034] As the above structural setting, different from the prior art, the prior art usually uses a plastic pull rod. After the bimetallic moves, it pushes the plastic pull rod to drive the trigger assembly 5 to act. After the plastic pull rod pulls the locking operating mechanism of the trigger assembly 5, it is tripped. This method has high processing requirements for the plastic pull rod and the bimetallic component, and the product performance is unstable. However, in the present invention, as Figures 3-4As shown in the figure, a movable bimetallic pull rod 50 is arranged on the circuit breaker housing 1. The bimetallic pull rod 50 can be made of materials such as metal and is processed by a punching machine, which is convenient for processing. The front end is bent to form a pull plate 52 corresponding to the bimetallic sheet 3, and the rear end is connected to the trigger assembly 5 through a pin 54. When the bimetallic sheet 3 acts, it drives the pull plate 52 to swing, pulling the bimetallic pull rod 50 to move along the waist-shaped hole 53, so as to achieve the tripping effect.

[0035] As a further setting of the above solution, the arc extinguishing grid 21 includes a plurality of arc extinguishing covers 25 on both sides and a plurality of grid sheets 26 fixed on the arc extinguishing covers 25 on both sides. The top and bottom of the arc extinguishing grid 21 are enclosed by an arc guiding plate 47 and a runway-shaped arc extinguishing sheet 22. In the solution of this embodiment, the top and bottom openings of the arc extinguishing grid 21 are closed by the arc guiding plate 47 and the runway-shaped arc extinguishing sheet 22, and its airtightness and the arc guiding ability are stronger than those of the prior art.

[0036] As a further setting of the above solution, near-arc grooves 49 are provided on the opposite surfaces of the runway-shaped arc extinguishing sheet 22, the U-shaped breaking part 44, the arc leading part 45 of the static contact rod 42, and the arc guiding plate 47. The near-arc grooves 49 on the runway-shaped arc extinguishing sheet 22 and the static contact rod 42 are opposite. The setting of the near-arc grooves 49 can affect the movement of the arc, so that the arc will move through the two nearest near-arc grooves 49, so that the arc can move more accurately in the middle of the runway-shaped arc extinguishing sheet 22 and the static contact rod 42 and enter the arc extinguishing grid 21 opposite the middle, avoiding deviation and unstable arc extinguishing.

[0037] As a further setting of the above solution, inserting plate pieces 40 are provided on the runway-shaped arc extinguishing sheet 22, the magnetic yoke 41, and the static contact rod 42. A positioning slot 10 is provided on the circuit breaker housing 1. The inserting plate pieces 40 are inserted opposite to the positioning slot 10. Installation hooks 48 are provided at the ends of the runway-shaped arc extinguishing sheet 22 and the arc guiding plate 47. An adjusting slot 23 is also provided on the runway-shaped arc extinguishing sheet 22, and the adjusting slot 23 corresponds to the clamping block 24 on the arc extinguishing grid 21. The designs of the installation hooks 48, the inserting plate pieces 40, the positioning slot 10, etc. are all to improve the installation stability of the components in the circuit breaker housing 1. Especially for the arc extinguishing components that play an important role, they not only need to be stuck by the reserved slots between the circuit breaker housings 1, but also can be limited and fixed by the elasticity of their own metal sheets if necessary, so as to avoid problems such as loosening after long-term use, resulting in ineffective protection when electric leakage occurs. Further, as the above structural settings, the arc extinguishing grid 21 of this embodiment is as Figures 2-3As shown, clamping blocks 24 are arranged at the upper and lower ends of the arc extinguishing grid 21, and an adjusting slot 23 is also arranged on the runway-shaped arc extinguishing piece 22. During installation, the staff can select according to the usage requirements through the clamping fit of the clamping block 24 and the adjusting slot 23, so as to adjust the installation position of the arc extinguishing grid 21, and achieve the simple adjustment requirement of the travel of the arc entering the arc extinguishing grid 21 under the assembly and subsequent usage requirements, and meet the arc extinguishing protection requirements for the circuit breaker to cope with different installation working environment voltages.

[0038] As a further setting of the above solution, the static contact rod 42 and the magnetic yoke 41 are separately arranged, and a number of buckles 46 are arranged at the part where they are in contact. The buckles 46 are used to limit and fix the static contact rod 42 and the magnetic yoke 41. As Figure 5 shown in this structural setting, compared with the prior art where a metal conductive plate is integrally bent, the separate setting of the present invention can not only facilitate production and assembly, but also improve the usage strength due to the connection of the separate parts through the buckles 46.

[0039] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the present invention's solution and its equivalent technologies, the present invention also intends to include these changes and modifications.

Claims

1. A small RCBO circuit breaker, comprising a circuit breaker housing (1), an arc extinguishing mechanism (2), a bimetallic strip (3), a magnetic coil (4) and a trigger assembly (5), characterized in that: The arc extinguishing mechanism (2) comprises an arc extinguishing grid (21) and a racetrack arc extinguishing piece (22); the trigger assembly (5) is connected to a moving contact (51); a stationary contact rod (42) is connected to the magnetic yoke (41) of the magnetic coil (4); a stationary contact rod (42) is further provided with a stationary contact (43); the stationary contact rod (42) comprises a U-shaped breaking portion (44) protruding toward the racetrack arc extinguishing piece (22); the U-shaped breaking portion (44) is extended toward the arc extinguishing grid (21) and is provided with an arc striking portion (45) and an arc guide plate (47) parallel to the upper end of the arc extinguishing grid (21); the arc striking portion (45) is connected to the magnetic yoke (41) of the magnetic coil (4); 5) is arranged relative to the angle of inclination of the runway-type arc-extinguishing sheet (22) relative to the arc-extinguishing grid (21); the trigger assembly (5) is also provided with a bimetallic pull rod (50), the bimetallic pull rod (50) is mounted on the trigger assembly (5) via a pin (54), and the other end of the bimetallic pull rod is provided with a pull plate (52) arranged in conjunction with the bimetallic sheet (3); the circuit breaker housing (1) is also provided with a guide shaft (11), and the bimetallic pull rod (50) is also provided with a waist-shaped hole (53), the guide shaft (11) and the pin (54) are located in the waist-shaped hole (53) and slide to limit excessive movement of the bimetallic pull rod (50).

2. A small RCBO circuit breaker according to claim 1, characterized in that: The arc extinguishing grid (21) comprises a plurality of arc extinguishing covers (25) on both sides and a plurality of grid pieces (26) fixed to the arc extinguishing covers (25) on both sides. The top and bottom of the arc extinguishing grid (21) are sealed by arc guide plates (47) and racetrack-type arc extinguishing pieces (22).

3. A small RCBO circuit breaker according to claim 1, characterized in that: A retaining plate (211) is provided at a distance at the rear end of the arc extinguishing grid (21), an airflow channel (212) is provided at the rear side of the retaining plate (211), and a notch (213) in communication with the airflow channel (212) is provided on the circuit breaker housing (1).

4. A small RCBO circuit breaker according to claim 1, characterized in that: The circuit breaker housing (1) is also provided with an indication port (12), and the trigger assembly (5) is also provided with an indication member (59), the indication member (59) being arranged opposite to the indication port (12), and the indication member (59) being used to correspond to the trigger position of the trigger assembly (5).

5. A small RCBO circuit breaker according to claim 1, characterized in that: The U-shaped breaking portion (44), the arc striking portion (45) and the opposing surfaces of the arc guide plate (47) of the racetrack arc extinguishing piece (22) and the stationary contact rod (42) are all provided with arc near grooves (49), and the arc near grooves (49) provided on the racetrack arc extinguishing piece (22) and the stationary contact rod (42) are opposed to each other.

6. A small RCBO circuit breaker according to claim 1, characterized in that: The racetrack arc-extinguishing piece (22) and the arc-guiding plate (47) are both provided with mounting hooks (48) at their ends, and the racetrack arc-extinguishing piece (22) is also provided with an adjustment slot (23), the adjustment slot (23) being arranged corresponding to a block (24) on the arc-extinguishing grid (21).

7. A small RCBO circuit breaker according to claim 1, characterized in that: The racetrack arc extinguishing piece (22), the magnetic yoke (41) and the static contact rod (42) are all provided with an inserting plate (40), the circuit breaker housing (1) is provided with a positioning slot (10), and the inserting plate (40) is relatively inserted into the positioning slot (10).

8. A small RCBO circuit breaker according to claim 1, characterized in that: The stationary contact rod (42) and the magnetic yoke (41) are arranged separately, and the abutting parts thereof are provided with a plurality of buckles (46), and the buckles (46) are used to limit and fix the stationary contact rod (42) and the magnetic yoke (41).

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