A small RCBO circuit breaker

Abstract

The present invention discloses a small RCBO circuit breaker, comprising a circuit breaker housing, 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 strip. The static contact rod comprises a static contact, a U-shaped breaking portion, an arc striking portion, and an arc guide plate. The inclination angle of the arc striking portion is arranged relative to the angle of the runway-type arc extinguishing strip relative to the arc chute. The trigger assembly is further provided with a bimetallic pull rod, which is mounted on the trigger assembly via a pin and has a pull plate at the other end for cooperating with the bimetallic strip. The circuit breaker housing is further provided with a guide shaft, and the bimetallic pull rod is further provided with a waist-shaped hole. The guide shaft and the pin slide in the waist-shaped hole to limit excessive movement of the bimetallic pull rod. The small RCBO circuit breaker of the present invention improves arc extinguishing and breaking capacity by improving the contact assembly, optimizes the internal structure, reduces production costs, improves material utilization, can meet better usage requirements, and has strong overall stability.

Description

Technical Field

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

[0002] A challenge for power distribution networks in rural areas is the low awareness of electricity safety among residents, making it difficult to strictly adhere to standard installation requirements. This results in live electricity at the consumer end, preventing the proper operation of end-of-line protection. Therefore, RCBO (Residual Current Detection) circuit breakers, which offer overload, short-circuit, and leakage protection, have become a common means of end-of-line protection. These circuit breakers combine the functions of both a circuit breaker and a leakage protector. They are commonly used in electrical circuits and are widely used for mobile electrical equipment and handheld power tools; electrical equipment installed in harsh environments such as humid and corrosive environments; electrical construction machinery at construction sites; socket circuits in buildings such as schools, businesses, and residences; underwater lighting in swimming pools, fountains, and bathhouses; power lines and equipment installed in water; and electrical medical equipment in hospitals that come into direct contact with the human body.

[0003] In the existing technology, each manufacturer has its own design for the internal structure of RCBO circuit breakers, which are improved based on actual needs. However, many RCBO circuit breakers in the existing technology still have the problem of low internal structure utilization. The components rely on a single fixing method, especially the arc extinguishing structure components. Once loose, it is easy to affect the arc extinguishing effect and cause equipment damage. In addition, the utilization rate of materials in the old products is relatively simple. Therefore, for the purpose of cost control and performance improvement, it is necessary to develop new structures and new processes in various aspects to achieve the needs of controlling costs and improving product performance. 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 capacity by improving the contact assembly, optimizes the internal structure setting, reduces production costs, improves material utilization, and can meet better usage requirements and has strong overall stability.

[0005] In order to achieve the above objectives, the technical solution adopted by the present invention is as follows: a small RCBO circuit breaker, comprising a circuit breaker housing, an arc extinguishing mechanism, a bimetallic strip, a magnetic coil and a trigger assembly, wherein the arc extinguishing mechanism includes an arc extinguishing grid and a runway-type arc extinguishing strip, the trigger assembly is connected to a moving contact, a static contact rod is connected to the magnetic yoke of the magnetic coil, the static contact rod is also provided with a static contact, and the static contact rod includes a U-shaped breaking portion protruding toward the runway-type arc extinguishing strip, the U-shaped breaking portion extends toward the arc extinguishing grid and is provided with an arc striking portion and an arc guide plate parallel to the upper end of the arc extinguishing grid, the inclination angle of the arc striking portion is set relative to the angle of the runway-type arc extinguishing strip relative to the arc extinguishing grid; the trigger assembly is also provided with a bimetallic pull rod, the bimetallic pull rod is mounted on the trigger assembly by a pin, and the other end of the bimetallic pull rod is provided with a pull plate to cooperate with the bimetallic strip, the circuit breaker housing is also provided with a guide shaft, and the bimetallic pull rod is also provided with a waist-shaped hole, the guide shaft and the pin are located in the waist-shaped hole and slide to limit excessive movement of the bimetallic pull rod.

[0006] As a further configuration of the above solution, the arc chute includes a plurality of arc extinguishing covers on both sides and a plurality of grid plates fixed on the arc extinguishing covers on both sides. The top and bottom of the arc chute are sealed by arc guide plates and runway-type arc extinguishing plates.

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

[0008] As a further configuration of the above solution, an indicator port is further provided on the circuit breaker housing, and an indicator piece is further provided on the trigger assembly. The indicator piece is arranged opposite to the indicator port and is used to correspond to the trigger position of the trigger assembly.

[0009] As a further arrangement of the above scheme, the U-shaped breaking portion, arc striking portion and the relative surfaces of the arc guide plate of the runway-type arc extinguishing piece and the static contact rod are all provided with near-arc grooves, and the near-arc grooves are provided on the runway-type arc extinguishing piece and the static contact rod relative to each other.

[0010] As a further configuration of the above solution, the ends of the runway-type arc-extinguishing plate and the arc guide plate are both provided with mounting hooks, and the runway-type arc-extinguishing plate is also provided with an adjustment slot, which is arranged corresponding to the block on the arc-extinguishing grid.

[0011] As a further configuration of the above solution, the runway-type arc extinguishing piece, the magnetic yoke and the static contact rod are all provided with plug-in plates, the circuit breaker housing is provided with a positioning slot, and the plug-in plates are plugged into the positioning slot relative to each other.

[0012] As a further configuration of the above solution, the static contact rod and the magnetic yoke are separately provided, and a plurality of buckles are provided on the abutting parts thereof, and the buckles are used to limit and fix the static contact rod and the magnetic yoke.

[0013] Beneficial effects: The present invention provides a small RCBO circuit breaker that reduces processing difficulty, improves raw material utilization and reduces costs by providing a separate static contact rod and a magnetic yoke, improves the shell cavity and the internal arc extinguishing structure, provides a U-shaped static contact rod to improve the breaking capacity, provides a runway-type arc extinguishing plate with a near-arc groove, and cooperates with an arc extinguishing chamber structure with eleven grid plates to better achieve arc extinguishing protection. A new bimetallic pull rod mechanism is designed, and pins and metal pull rods are used to replace the plastic pull rods of the prior art, which reduces the difficulty of processing and improves product performance. In addition, support members are provided on the shell and contact assembly to add an indication function, which facilitates direct observation of the internal triggering action by the staff. The RCBO circuit breaker of the present invention develops a new internal setting structure to meet customer needs and cost control, improves the contact assembly to improve the arc extinguishing and breaking capacity, can meet better usage requirements, and has strong overall stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the external structure of the circuit breaker of the present invention.

[0015] Figure 2 Schematic diagram of the internal structure of the circuit breaker of the present invention.

[0016] Figure 3 It is a side structural schematic diagram 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 This is a schematic diagram of the structure of the runway-type arc-extinguishing piece and the static contact rod of the present invention.

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

[0020] Figure numerals: 1. Circuit breaker housing; 10. Positioning slot; 11. Guide shaft; 12. Indicator port; 2. Arc extinguishing mechanism; 21. Arc extinguishing grid; 211. Positioning plate; 212. Air flow channel; 213. Hole; 22. Runway-type arc extinguishing plate; 23. Adjustment slot; 24. Block; 25. Arc extinguishing cover; 26. Grid; 3. Bimetallic plate; 4. Magnetic coil; 40. Insert plate; 41. Magnetic yoke; 42. Static contact rod; 43. Static contact; 44. U-shaped breaking part; 45. Arc striking part; 46. Buckle; 47. Arc guide plate; 48. Mounting hook; 49. Near-arc groove; 5. Trigger assembly; 50. Bimetallic pull rod; 51. Moving contact; 52. Pull plate; 53. Waist-shaped hole; 54. Pin; 59. Indicator. DETAILED DESCRIPTION

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

[0022] like Figure 1-6 A small RCBO circuit breaker shown in the figure includes a circuit breaker housing 1, an arc extinguishing mechanism 2, a bimetallic strip 3, a magnetic coil 4 and a trigger assembly 5. The arc extinguishing mechanism 2 includes an arc extinguishing grid 21 and a runway arc extinguishing strip 22. The trigger assembly 5 is connected to a moving contact 51. A static contact rod 42 is connected to the magnetic yoke 41 of the magnetic coil 4. The static contact rod 42 is also provided with a static contact 43. The static contact rod 42 includes a U-shaped breaking portion 44 protruding toward the runway arc extinguishing strip 22. The U-shaped breaking portion 44 extends toward the arc extinguishing grid 21 and is provided with an arc striking portion 45 and an arc striking portion 45 connected to the arc extinguishing strip 22. An arc guide plate 47 is parallel to the upper end of the arc extinguishing grid 21, and the inclination angle of the arc striking portion 45 is set relative to the angle of the runway-type arc extinguishing plate 22 relative to the arc extinguishing grid 21; the trigger assembly 5 is also provided with a bimetallic pull rod 50, which is installed on the trigger assembly 5 through a pin 54, and the other end of the bimetallic pull rod 50 is provided with a pull plate 52 to cooperate with the bimetallic plate 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.

[0023] As a further configuration of the above scheme, the arc chute 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 chute 21 are sealed by arc guide plates 47 and runway-type arc extinguishing pieces 22.

[0024] As a further configuration of the above solution, a retaining plate 211 is provided at the rear end of the arc extinguishing grid 21, an air flow channel 212 is provided at the rear side of the retaining plate 211, and a hole 213 communicating with the air flow channel 212 is provided on the circuit breaker housing 1. Figure 2 and Figure 3 The airflow duct 212 of the embodiment of the present invention is designed as shown. The airflow duct 212 is connected to the arc extinguishing chamber position of the arc extinguishing grid 21. When an arc occurs inside and the air expands, it can not only serve as an air discharge flow channel, but also provide a heat dissipation hole for the high heat in the arc extinguishing chamber. The design of the airflow duct 212 has an inclined arc. When an arc occurs, based on the runway-type arc extinguishing plate 22 guiding the moving direction of the arc, the airflow pressure formed will further give a driving force to the high-temperature airflow heated by the internal arc, and push the high-temperature airflow along the airflow duct 212 out of the notch 213 to reduce the internal high-temperature air content and enhance the cooling of the arc extinguishing grid 21.

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

[0026] As a further arrangement of the above scheme, the U-shaped dividing portion 44, the arc striking portion 45 and the relative surfaces of the arc guide plate 47 of the runway-type arc-extinguishing piece 22 and the static contact rod 42 are provided with near-arc grooves 49, and the near-arc grooves 49 are provided on the runway-type arc-extinguishing piece 22 and the static contact rod 42 relative to each other.

[0027] As a further configuration of the above scheme, the ends of the runway-type arc-extinguishing piece 22 and the arc guide plate 47 are both provided with mounting hooks 48 , and the runway-type arc-extinguishing piece 22 is also provided with an adjustment slot 23 , and the adjustment slot 23 is provided corresponding to the block 24 on the arc-extinguishing grid 21 .

[0028] As a further configuration of the above solution, the runway-type arc-extinguishing piece 22 , the yoke 41 and the static contact rod 42 are all provided with an inserting plate 40 , and the circuit breaker housing 1 is provided with a positioning slot 10 , and the inserting plate 40 is inserted into the positioning slot 10 relative to the inserting plate 40 .

[0029] As a further configuration of the above solution, the stationary contact rod 42 and the yoke 41 are separately provided, and a plurality of buckles 46 are provided on the abutting parts thereof, and the buckles 46 are used to limit and fix the stationary contact rod 42 and the yoke 41 .

[0030] Example: Reference Figure 1 The RCBO circuit breaker of the present invention shown in the figure has an external structure comprising a circuit breaker housing 1 with an indicator opening 12 and an indicator member 59 that can be observed through the indicator opening 12. The indicator member 59 is linked with the trigger assembly 5 to indicate the switch opening and closing status.

[0031] refer to Figure 2-3 As shown, an arc extinguishing mechanism 2, a bimetallic strip 3, a magnetic coil 4, and a trigger assembly 5 are provided in the circuit breaker housing 1. The arc extinguishing mechanism 2 includes an arc extinguishing grid 21 composed of an arc extinguishing cover 25 and a grid 26. A runway-type arc extinguishing strip 22 and a static contact rod 42 are provided on the opening side of the grid 26 of the arc extinguishing grid 21. Figure 3The runway-type arc-extinguishing plate 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 surface. This structural design enables the arc generated at the driven contact 51 and the static contact 43 to be evenly stretched in the inclined section of the runway-type arc-extinguishing plate 22 and the static contact rod 42 after passing through the U-shaped dividing portion 44 and the runway-type arc-extinguishing plate 22, and enter the arc extinguishing grid 21. Based on the inclined structure of the mirror pair, the arc enters the arc extinguishing grid 21 after stretching, and the contact with multiple grids 26 is more uniform, which can better connect the arc to the arc extinguishing grid 21, reduce local concentration problems, avoid local fragility of the arc extinguishing grid 21 due to arc concentration, and improve the service life of the arc extinguishing grid 21.

[0032] Furthermore, the static contact rod 42 extending from the magnetic coil 4 adopts a structural setting that is separate from the yoke 41 compared to the static contact rod 42 in the embodiment of the technical present invention. A plurality of buckles 46 are provided on the static contact rod 42 to cooperate with the yoke 41 for positioning. The setting of splitting the yoke 41 and the static contact rod 42 into separate structures can not only reduce the processing difficulty, but also improve the utilization rate of materials and reduce costs.

[0033] 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 portion 44 with an arc and protruding relative to the runway-type arc extinguishing piece 22 is provided behind the static contact 43. The purpose of the U-shaped protrusion is to reduce the distance between 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. The above-mentioned U-shaped structural setting can improve the breaking capacity between the moving contact 51 and the static contact rod 42, making the arc extinguishing of the circuit breaker of this embodiment safer.

[0034] refer to Figure 3-4 In the embodiment of the present invention, the moving contact 51 is connected to the trigger assembly 5, and the trigger assembly 5 is further provided with a bimetallic pull rod 50, which is installed on the trigger assembly 5 through a pin 54. The other end of the bimetallic pull rod 50 is provided with a pull plate 52 to cooperate with the bimetallic sheet 3. The circuit breaker housing 1 is further provided with a guide shaft 11, and the bimetallic pull rod 50 is further 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.

[0035] As the above-mentioned structural setting is different from the prior art, the prior art usually adopts a plastic pull rod. After the bimetal moves, the plastic pull rod is pushed to drive the trigger component 5 to move. The plastic pull rod is pulled to release the lock operating mechanism of the trigger component 5. This method requires high processing technology for the plastic pull rod and the bimetal component, and the product performance is unstable. Figure 3-4As shown, a movable bimetallic pull rod 50 is provided on the circuit breaker housing 1. The bimetallic pull rod 50 can be made of metal or other materials and can be processed by a punching machine, which is convenient to process. The front end is bent to form a pull plate 52 corresponding to the bimetallic strip 3, and the rear end is connected to the trigger assembly 5 through a pin 54. When the bimetallic strip 3 is actuated, the pull plate 52 is driven to swing, pulling the bimetallic pull rod 50 to move along the waist-shaped hole 53, thereby achieving a tripping effect.

[0036] As a further configuration of the above-mentioned scheme, 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 sealed by arc guide plates 47 and runway-type arc extinguishing pieces 22. In the scheme of this embodiment, the top and bottom openings of the arc extinguishing grid 21 are sealed by arc guide plates 47 and runway-type arc extinguishing pieces 22, which has stronger airtightness and arc guiding capability than the prior art.

[0037] As a further arrangement of the above-mentioned scheme, the U-shaped dividing portion 44, the arc striking portion 45 and the relative surfaces of the arc guide plate 47 of the runway-type arc-extinguishing piece 22 and the static contact rod 42 are provided with near-arc grooves 49. The near-arc grooves 49 are provided on the runway-type arc-extinguishing piece 22 and the static contact rod 42 relative to each other. The arrangement of the near-arc grooves 49 can affect the movement of the arc, so that the arc will move from the two nearest near-arc grooves 49, so that the arc can more accurately move in the middle of the runway-type arc-extinguishing piece 22 and the static contact rod 42 into the arc extinguishing grid 21 facing the middle, thereby avoiding deviation and unstable arc extinguishing.

[0038] As a further arrangement of the above scheme, the runway-type arc-extinguishing piece 22, the magnetic yoke 41 and the static contact rod 42 are all provided with an inserting plate 40, and the circuit breaker housing 1 is provided with a positioning slot 10, the inserting plate 40 is relatively plugged into the positioning slot 10, and the end of the runway-type arc-extinguishing piece 22 and the arc guide plate 47 are both provided with a mounting hook 48, and the runway-type arc-extinguishing piece 22 is also provided with an adjustment slot 23, and the adjustment slot 23 is arranged corresponding to the block 24 on the arc extinguishing grid 21, and the designs of the mounting hook 48, the inserting plate 40, the positioning slot 10, etc. are all intended to improve the installation stability of the components in the circuit breaker housing 1, especially the arc extinguishing components that play an important role, which not only rely on the reserved slots between the circuit breaker housing 1 to clamp, but also rely on the elastic force of their own metal sheets to limit and fix if necessary, so as to avoid problems such as loosening after long-term use, resulting in poor protection when leakage occurs. Further, as shown in the above-mentioned structural arrangement, the arc extinguishing grid 21 of this embodiment is as follows Figure 2-3As shown, blocks 24 are extended at the upper and lower ends of the arc extinguishing grid 21, and an adjustment slot 23 is also provided on the runway-type arc extinguishing piece 22. During installation, the staff can adjust the installation position of the arc extinguishing grid 21 by adjusting the block 24 and the adjustment slot 23 according to the use requirements, so as to achieve the simple adjustment requirement of the stroke of the arc entering the arc extinguishing grid 21 under the assembly and subsequent use requirements, so as to adjust the circuit breaker to cope with the arc extinguishing protection requirements under different installation working environment voltages.

[0039] As a further configuration of the above solution, the static contact rod 42 and the yoke 41 are separately provided, and a plurality of buckles 46 are provided on the abutting parts thereof, and the buckles 46 are used to limit and fix the static contact rod 42 and the yoke 41. Figure 5 Compared with the prior art structure in which a metal conductive plate is bent integrally, the structure shown in the present invention has a split structure that is not only convenient for production and assembly, but also connected by buckles 46 to improve the strength of use.

[0040] 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 and its equivalents, the present invention is also intended to include these modifications and variations.

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 runway-type 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); and the stationary contact rod (42) comprises a U-shaped breaking portion (44) protruding toward the runway-type 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 inclination angle of the arc striking portion (45) is arranged relative to the angle of the runway-type arc extinguishing piece (22) relative to the arc extinguishing grid (21); The U-shaped breaking portion (44), the arc striking portion (45), and the arc guide plate (47) of the runway-type arc extinguishing piece (22) and the static contact rod (42) are all provided with arc near grooves (49) on the opposite sides thereof. The arc moves from the two arc near grooves (49) closest to each other, and the arc can more accurately move in the middle of the runway-type arc extinguishing piece (22) and the static contact rod (42) into the arc extinguishing grid (21) facing the middle. The arc-proximal grooves (49) provided on the runway-type arc-extinguishing piece (22) and the static contact rod (42) are opposite to each other, and the inclined surfaces thereof for stretching the arc length are symmetrically arranged. After the arc generated at the moving contact (51) and the static contact (43) passes through the U-shaped breaking portion (44) and the runway-type arc-extinguishing piece (22), it is evenly stretched into the arc chute (21) through the inclined sections of the runway-type arc-extinguishing piece (22) and the static contact rod (42). Based on the mirror-symmetrical inclined structure, the arc enters the arc chute (21) after being stretched, and contacts the multiple grids (26) more evenly, thereby reducing local concentration and avoiding local damage of the arc chute (21) due to arc concentration. The ends of the runway-type arc-extinguishing piece (22) and the arc guide plate (47) are further provided with mounting hooks (48), and the runway-type arc-extinguishing piece (22) is further provided with an adjustment slot (23), and the adjustment slot (23) is arranged corresponding to the block (24) on the arc-extinguishing grid (21); The trigger assembly (5) is also provided with a bimetallic pull rod (50), which is mounted on the trigger assembly (5) via a pin (54), and has a pull plate (52) at the other end thereof for cooperating 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 on 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 runway-type arc extinguishing pieces (22).

3. The small RCBO circuit breaker according to claim 1, characterized in that: A retaining plate (211) is provided 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 hole (213) communicating with the airflow channel (212) is provided on the circuit breaker housing (1).

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

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

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

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