Large-opening-distance miniature circuit breaker

Abstract

The invention discloses a large-opening-distance miniature circuit breaker. The problems that an existing circuit breaker is small in opening distance and cannot break large current are solved. The switch comprises a shell, a static contact and a moving contact, wherein the moving contact is provided with a first position attached to the static contact and a second position separated from the static contact; the operating handle is connected with the operating mechanism; the operating mechanism comprises a contact frame, a jump pin, a lock catch and a baffle plate, the contact frame is provided with a first mounting hole and a second mounting hole, and the baffle plate is hinged with the contact frame at the first mounting hole; the baffle plate is provided with a clamping groove for the moving contact to pass through, and the baffle plate is linked with the moving contact; the contact torsion spring is sleeved on the intermediate shaft; and the contact torsion spring has a movement trend of driving the moving contact to tend to the second position through the baffle plate. The invention has the advantages of simple structure, convenience in assembly, reliable action and the like.

Description

Technical Field

[0001] This invention relates to a circuit breaker, specifically a miniature circuit breaker with a large opening distance. Background Technology

[0002] A circuit breaker is a mechanical switching device capable of connecting, carrying, and disconnecting current under normal circuit conditions, as well as connecting, carrying, and disconnecting current under abnormal circuit conditions within a specified time. When a fault current occurs in a circuit, the circuit breaker opens, and an electric arc is generated between the moving and stationary contacts. This arc needs to be completely extinguished by a complete arc-extinguishing system to disconnect the faulty equipment and lines from the power grid, thus protecting the equipment and lines. When the electric arc is introduced into the arc-extinguishing chamber, it is separated into many segments by the metal grids within the chamber. Each segment of the arc generates a near-polar voltage near the metal grids, causing the voltage drop across the entire arc to increase rapidly, extinguishing the arc.

[0003] Currently, new energy systems are developing rapidly. To reduce costs and increase efficiency, increasing system voltage is a major way for new energy-related systems such as photovoltaics, energy storage, and charging piles to improve efficiency and reduce costs. However, increasing the voltage significantly increases the difficulty of arc breaking by circuit breakers, and also significantly reduces the number of circuit breakers' lifespan cycles. New energy-related systems are generally low-voltage DC systems, and the arc does not automatically extinguish when it crosses zero. During breaking, the arc voltage needs to be increased by lengthening the arc, cooling the arc, compressing the arc, and cutting the arc with metal grids, forcing the DC current to cross zero. When the arc voltage is greater than the power supply voltage on both sides of the circuit breaker, the arc current begins to decrease, and when the arc current is zero, the arc is completely broken and extinguished.

[0004] Existing circuit breakers generally have small opening distances and poor overall arc-starting structures. The opening distance of the moving contact (distance between the moving and stationary contacts) is typically around 5.5mm. When the DC system voltage is high, even if the moving contact is fully open, the arc still connects the moving and stationary contacts in series, making it difficult to disconnect the circuit. In existing miniature circuit breakers, the common mechanism uses tension and compression springs to achieve the opening and closing force. When the opening distance increases, these springs cannot achieve a large deformation distance due to the excessive rotation angle of the mechanism, thus failing to reliably provide the opening and closing force for the circuit breaker. Summary of the Invention

[0005] To address the problem that existing circuit breakers in the background art have a small opening distance and cannot interrupt large currents, this invention provides a miniature circuit breaker with a large opening distance.

[0006] The technical solution of this invention is: a large-pitch miniature circuit breaker, comprising a housing and an operating handle, and further comprising: The stationary contact is located inside the housing; The moving contact is located inside the housing and has a first position that is in contact with the stationary contact and a second position that is separated from the stationary contact. The arc extinguishing system, located inside the housing, is used to extinguish the electric arc generated when the moving contact separates from the stationary contact; An operating mechanism is located inside the housing, and the operating handle is connected to the operating mechanism. The operating mechanism includes a contact frame, a jumper, a latch, and a baffle. The contact frame is provided with a first mounting hole and a second mounting hole. The baffle is hinged to the contact frame at the first mounting hole. The baffle is provided with a slot for the moving contact to pass through, and the baffle is linked with the moving contact. A contact torsion spring is sleeved on the intermediate shaft; one end of the contact torsion spring abuts against the housing, and the other end abuts against the baffle; the contact torsion spring has a tendency to drive the moving contact to its second position through the baffle. The tripping system, located inside the housing, is used for tripping in case of failure.

[0007] As a further improvement of the present invention, the contact frame is mounted on the housing via an intermediate shaft, and the latch is hinged to the contact frame via the intermediate shaft; the moving contact is hinged to the contact frame at the first mounting hole; the jumper is hinged to the contact frame via the second mounting hole; the latch has a first position that cooperates with the jumper and is linked to the moving contact, and a second position that is unlocked by rotating relative to the jumper; the moving contact has a sliding hole, and the intermediate shaft passes through the sliding hole, so that there is a swing gap between the moving contact and the intermediate shaft.

[0008] As a further improvement of the present invention, the baffle is provided with a first protrusion, the housing is provided with a protrusion, one end of the contact torsion spring abuts against the protrusion, and the other end of the contact torsion spring abuts against the first protrusion and has a tendency to drive the moving contact to its second position through the first protrusion; the baffle is provided with a limiting end for limiting the movement of the moving contact, and the limiting end abuts against the protrusion when the moving contact is in its second position.

[0009] As a further improvement of the present invention, the housing is provided with a dividing edge, which divides the space inside the housing into an operating space and an arc-extinguishing space, and the moving contact passes through the dividing edge on the housing from the operating space and is disposed in the arc-extinguishing space.

[0010] As a further improvement of the present invention, the baffle is provided with a second boss, a third boss and a baffle mounting part. The second boss, the third boss and the baffle mounting part cooperate with each other to form the slot through which the moving contact passes. The projections of the second boss and / or the third boss on the vertical plane exceed the projections of the baffle mounting part and the dividing edge on the vertical plane.

[0011] As a further improvement of the present invention, the moving contact along the separation edge is arranged in an arc shape on the housing, and the baffle is arranged in the operating space above the separation edge.

[0012] As a further improvement of the present invention, the arc extinguishing system includes two arc extinguishing chambers, which are located within the arc extinguishing space. One of the arc extinguishing chambers is located on the path of the moving contact as it moves from its first position to its second position.

[0013] As a further improvement of the present invention, it also includes an indicator for indicating; the indicator is hinged to the housing and can rotate relative to the housing, and the contact frame is provided with a lever for driving the indicator to rotate.

[0014] As a further improvement of the present invention, the indicator is provided with an opening, the paddle is inserted into the opening and drives the indicator to rotate relative to the housing when the contact frame rotates, and when the moving contact is in its first position and second position, the projection of the orientation of the opening on the horizontal plane falls on the left and right sides of the intermediate axis.

[0015] As a further improvement of the present invention, the latch is provided with a support surface, and the snap fastener is provided with a hook surface. The hook surface and the support surface fit together so that the latch and the snap fastener are linked together.

[0016] The beneficial effects of this invention are that it incorporates a contact torsion spring, making efficient use of the space within the housing. The torsion spring reliably drives the baffle and contact frame, resulting in a larger swing distance for the moving contact and enabling reliable opening and closing of the circuit breaker. This invention also boasts advantages such as simple structure, convenient assembly, reliable operation, and long service life. Attached Figure Description

[0017] Appendix Figure 1 This is a schematic diagram of the structure when the moving contact is in the first position according to an embodiment of the present invention.

[0018] Appendix Figure 2 This is a schematic diagram of the structure when the moving contact is in the second position according to an embodiment of the present invention.

[0019] Appendix Figure 3 For the appendix Figure 2 A schematic diagram of the structure after removing one arc-extinguishing chamber.

[0020] Appendix Figure 4 For the appendix Figure 1 A schematic diagram of the structure after removing the operating mechanism.

[0021] Appendix Figure 5 For the appendix Figure 2 A schematic diagram of the structure after removing the operating mechanism.

[0022] Appendix Figure 6 This is a schematic diagram of the operating mechanism according to an embodiment of the present invention.

[0023] Appendix Figure 7 For the appendix Figure 6 A schematic diagram of the explosion structure.

[0024] Appendix Figure 8 This is a schematic diagram of the structure of the operating mechanism in another direction according to an embodiment of the present invention.

[0025] Appendix Figure 9 This is a schematic diagram of the contact frame structure according to an embodiment of the present invention.

[0026] Appendix Figure 10 This is a schematic diagram of the baffle structure according to an embodiment of the present invention.

[0027] Appendix Figure 11 This is a schematic diagram of the baffle from another direction in an embodiment of the present invention.

[0028] In the diagram, 1. Housing; 11. Intermediate shaft; 12. Protrusion; 13. Separating edge; 14. Operating space; 15. Arc extinguishing space; 2. Operating handle; 21. U-shaped connecting rod; 3. Stationary contact; 4. Moving contact; 41. Sliding hole; 5. Arc extinguishing system; 51. Arc extinguishing chamber; 6. Operating mechanism; 61. Contact frame; 611. First mounting hole; 612. Second mounting hole; 613. Paddle; 62. Jumper; 621. Buckle surface; 63. Lock; 631. Support surface; 64. Baffle; 641. Slot; 642. First boss; 643. Limiting end; 644. Second boss; 645. Third boss; 646. Baffle mounting part; 7. Contact torsion spring; 8. Tripping system; 9. Indicator; 91. Opening. Detailed Implementation

[0029] The embodiments of the present invention will be further described below with reference to the accompanying drawings: Depend on Figure 1 Combination Figure 2-11 As shown, a large-pitch miniature circuit breaker includes a housing 1 and an operating handle 2, and further includes: The stationary contact 3 is located inside the housing 1; The moving contact 4 is disposed inside the housing 1. The moving contact 4 has a first position that is in contact with the stationary contact 3 and a second position that is separated from the stationary contact 3. Arc extinguishing system 5, located inside housing 1, is used to extinguish the electric arc generated when moving contact 4 separates from stationary contact 3; An operating mechanism 6 is located inside the housing 1, and the operating handle 2 is connected to the operating mechanism 6. The operating mechanism 6 includes a contact frame 61, a jumper 62, a locking buckle 63, and a baffle 64. The contact frame 61 is provided with a first mounting hole 611 and a second mounting hole 612. The baffle 64 is hinged to the contact frame 61 at the first mounting hole 611. The baffle 64 is provided with a slot 641 for the moving contact 4 to pass through, and the baffle 64 is linked with the moving contact 4.

[0030] A contact torsion spring 7 is sleeved on the intermediate shaft 11; one end of the contact torsion spring 7 abuts against the housing 1, and the other end abuts against the baffle 64; the contact torsion spring 7 has a tendency to drive the moving contact 4 to its second position through the baffle 64. The tripping system 8, located within the housing 1, is used for fault tripping. The beneficial effects of this invention are that the inclusion of a contact torsion spring optimizes the use of space within the housing, and the torsion spring reliably drives the baffle and contact frame, resulting in a larger swing distance for the moving contact and reliably achieving the opening and closing of the circuit breaker. This invention also features simple structure, convenient assembly, reliable operation, and long service life. The beneficial effects of this invention are that the inclusion of a contact torsion spring optimizes the use of space within the housing, resulting in a reasonable internal layout that significantly reduces the overall volume of the opening and closing mechanism. The torsion spring reliably drives the baffle and contact frame, resulting in a larger swing distance for the moving contact and reliably achieving the opening and closing of the circuit breaker. This invention also features simple structure, convenient assembly, reliable operation, and long service life.

[0031] Further explanation with reference to the accompanying drawings: The contact frame is assembled on the housing. The moving contact and the baffle are hinged to the contact frame through the hole at the lower end of the contact frame (first mounting hole). The latch is hinged to the contact frame through the hole in the middle of the contact frame (at the intermediate shaft). The jumper is hinged to the contact frame through the hole at the upper end of the contact frame (second mounting hole). The contact frame drives the indicator to rotate through the extended paddle. The operating handle is mounted on the housing and is linked to the jumper through a U-shaped connecting rod. One end of the contact torsion spring is engaged with the protrusion on the base, and the other end is engaged with the first protrusion of the baffle. The baffle presses against the moving contact through the second and third protrusions. The hole at the lower end of the moving contact is hinged to the contact frame, and the hole (sliding hole) at the upper end is hinged to the contact frame and the latch through the intermediate shaft. The hole of the snap fastener is hinged to the hole (second mounting hole) at the upper end of the contact bracket via a shaft, and the buckle surface at the other end will press against the support surface of the lock when rotating.

[0032] When the product is in the open position, pushing the operating handle counterclockwise causes it to rotate. External force applied to the handle initiates rotation, driving a U-shaped linkage through a lower hole. This linkage, in turn, pushes the trip latch through a hole, causing it to rotate. The trip latch's latching surface rests against the locking latch's support surface, locking the latch and engaging in a linked manner. The trip latch then pushes the locking latch to rotate, which in turn drives the contact frame to rotate. The contact frame, along with the baffle, pushes the contact torsion spring to rotate, thus applying force to the contact spring. When the side of the operating handle (or a limit structure) touches the housing, the handle stops rotating, the moving contact contacts the stationary contact, and the product closes.

[0033] When a short circuit fault occurs in the circuit, the electromagnetic mechanism (i.e., the tripping system; the tripping system of this invention can be implemented using an existing electromagnetic tripping system; the electromagnetic mechanism typically includes a magnetic yoke, coil, push rod, etc., which will not be elaborated here) operates under the drive of the coil, pushing the push rod in the electromagnetic mechanism to the right. The push rod pushes the latch to rotate counterclockwise, and the support surface of the latch separates from the latch's latching surface when the latch rotates, unlocking the mechanism. Under the action of the contact torsion spring, the contact frame rotates counterclockwise. When one end of the baffle (limiting end) abuts against the protrusion on the housing, the contact spring stops rotating, and the moving contact returns to its initial position. At this time, the latch also returns to its initial position under the action of the latch return spring. The latch continues to rotate clockwise under the action of the U-shaped connecting rod at the moment it disengages from the latch, stopping after rotating to the rightmost point. Then, under the reverse force of the operating handle spring, the handle drives the jump buckle to rotate back through the U-shaped linkage. When the jump buckle contacts the lock, under the force of the operating handle spring, the jump buckle overcomes the reaction force of the lock reset spring and presses the buckle's latching surface back under the lock's supporting surface. When the side of the operating handle touches the rotating housing, the operating handle stops rotating, and the handle and jump buckle return to their initial positions.

[0034] When a fault current occurs in the circuit, the circuit breaker trips, generating an electric arc between the moving and stationary contacts. The moving and stationary contacts generate significant air pressure. At this time, due to the baffles (second and third protrusions) connected to the moving contact, the latch, and the housing (separation edge) form a relatively sealed area, making it difficult for the gas generated by the arc to move upwards (operating space). The arc, under pressure, can only move downwards (arc extinguishing space). Furthermore, when the moving and stationary contacts continue to open, the shielding and insulation effect of the baffles (second and third protrusions) and the housing (separation edge) prevents the arc from forming a circuit at the upper part of the moving and stationary contacts. This allows the product to be used in applications with high operating currents, resulting in a large swing distance (opening distance d) for the moving contact. The opening distance d of this invention can reach approximately 17mm, facilitating high-current interruption. The inclusion of two arc-extinguishing chambers, baffles, and a separation edge prevents arc damage to the operating mechanism and facilitates rapid and reliable arc extinguishing.

[0035] The contact frame 61 is mounted on the housing 1 via an intermediate shaft 11, and the latch 63 is hinged to the contact frame 61 via the intermediate shaft 11. The moving contact 4 is hinged to the contact frame 61 at the first mounting hole 611. The jump buckle 62 is hinged to the contact frame 61 via the second mounting hole 612. The latch 63 has a first position that cooperates with the jump buckle 62 and is linked to the moving contact, and a second position that is unlocked by rotating relative to the jump buckle 62. The moving contact 4 has a sliding hole 41, through which the intermediate shaft 11 passes, creating a swing gap between the moving contact 4 and the intermediate shaft 11. This structure results in a reasonable product layout, high space utilization within the housing, a large swing distance (large opening distance) for the moving contact, reliable movement of the moving contact, and a simple structure, thus increasing the swing distance of the moving contact. Specifically, the baffle is riveted to the moving contact. By riveting the baffle to the moving contact, four functions are achieved: First, the baffle and the housing base limit the opening position of the mechanism, ensuring the mechanism can reliably stop at a fixed position (i.e., reliable limiting is achieved by the baffle's limiting end abutting against the housing's protrusion); second, the cooperation between the baffle and the contact torsion spring provides the mechanism's restoring force (allowing it to automatically return to the initial opening position after tripping, achieved through the baffle's first protrusion); third, when the moving and stationary contacts are in contact, the moving contact... The head can continue to move under the action of the handle and the U-shaped connecting rod. At this time, the bottom of the moving contact remains stationary, and the upper sliding hole 41 can continue to move to the left. When the mechanism stops moving, the baffle, the moving contact, and the contact torsion spring can provide contact pressure to the moving contact. Fourth, when the moving and stationary contacts are opened, the protrusions on the other side of the baffle (i.e., the second protrusion and the third protrusion) can form a relatively sealed environment with the base and cover of the housing, maintaining a large pressure, so that the electric arc can move downward under the drive of air pressure, realizing the rapid transfer of the electric arc.

[0036] The baffle 64 has a first protrusion 642, and the housing 1 has a protrusion 12. One end of the contact torsion spring 7 abuts against the protrusion 12, and the other end of the contact torsion spring 7 abuts against the first protrusion 642 and has a tendency to drive the moving contact 4 to its second position through the first protrusion 642. The baffle 64 has a limiting end 643 for limiting the movement of the moving contact 4. The limiting end 643 abuts against the protrusion 12 when the moving contact 4 is in its second position. This structure makes the contact torsion spring easy to install, has a simple structure, and makes reasonable use of the space inside the housing. At the same time, the baffle is used to limit the movement and avoid excessive movement.

[0037] The housing 1 is provided with a dividing edge 13, which divides the space inside the housing 1 into an operating space 14 and an arc extinguishing space 15. The moving contact 4 passes through the dividing edge 13 on the housing 1 from the operating space 14 and is disposed in the arc extinguishing space 15. This can separate the arc extinguishing space and the operating space, prevent the arc from spreading to the operating space, and facilitate rapid arc extinguishing.

[0038] The baffle 64 is provided with a second protrusion 644, a third protrusion 645, and a baffle mounting part 646. The second protrusion 644, the third protrusion 645, and the baffle mounting part 646 cooperate to form the slot 641 through which the moving contact 4 passes. The projections of the second protrusion 644 and / or the third protrusion 645 on the vertical plane both exceed the projections of the baffle mounting part 646 and the separating edge 13 on the vertical plane. Specifically, the separating edge 13 is arc-shaped on the housing 1 along the movement trajectory of the moving contact 4, and the baffle 64 is located in the operating space 14 above the separating edge 13. When the moving and stationary contacts are fully open, a large distance is generated, which can ensure reliable disconnection between the moving and stationary contacts under high voltage and avoid arcing affecting other components.

[0039] The arc extinguishing system 5 includes two arc extinguishing chambers 51, which are located within the arc extinguishing space 15. One of the arc extinguishing chambers 51 is positioned along the path of the moving contact 4 as it moves from its first position to its second position. This design allows for reliable and rapid arc extinguishing. When the product generates a small arc, it can be extinguished directly within one arc extinguishing chamber. When the arc is large, a significant distance is created when the moving and stationary contacts are fully open, facilitating reliable disconnection. Furthermore, the two arc extinguishing chambers can reliably extinguish arcs generated by large currents, resulting in a wide range of product compatibility.

[0040] The invention also includes an indicator 9 for indication; the indicator 9 is hinged to the housing 1 and can rotate relative to the housing 1, and the contact frame 61 is provided with a lever 613 for driving the indicator 9 to rotate. Specifically, the indicator 9 has an opening 91, and the lever 613 is inserted into the opening 91 and drives the indicator 9 to rotate relative to the housing 1 when the contact frame 61 rotates. When the moving contact 4 is in its first position and second position, the projection of the opening 91 onto the horizontal plane falls on the left and right sides of the intermediate shaft 11. In this invention, the opening is located on both sides of the intermediate shaft when the moving contact is in different positions. Compared with existing indicators where the opening is on one side of the intermediate shaft and driven by a jumper, this invention makes the left and right deviation of the indicator itself smaller, avoiding large swing deviations from affecting product layout and installation, and facilitating interference with other components.

[0041] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0043] Please note to all technical personnel: Although the present invention has been described according to the specific embodiments above, the inventive concept of the present invention is not limited to this invention. Any modifications that utilize the inventive concept will be included within the scope of protection of the patent rights of the present invention.

Claims

1. A large-pitch miniature circuit breaker, comprising a housing (1) and an operating handle (2), characterized in that: Also includes: The stationary contact (3) is located inside the housing (1); The moving contact (4) is located inside the housing (1). The moving contact (4) has a first position that is in contact with the stationary contact (3) and a second position that is separated from the stationary contact (3). Arc extinguishing system (5), located inside housing (1), is used to extinguish the electric arc generated when the moving contact (4) separates from the stationary contact (3); An operating mechanism (6) is located inside the housing (1), and the operating handle (2) is connected to the operating mechanism (6). The operating mechanism (6) includes a contact frame (61), a jumper (62), a latch (63), and a baffle (64). The contact frame (61) is provided with a first mounting hole (611) and a second mounting hole (612). The baffle (64) is hinged to the contact frame (61) at the first mounting hole (611). The baffle (64) is provided with a slot (641) for the moving contact (4) to pass through. The baffle (64) is linked with the moving contact (4). A contact torsion spring (7) is sleeved on an intermediate shaft (11); one end of the contact torsion spring (7) abuts against the housing (1) and the other end abuts against the baffle (64); the contact torsion spring (7) has a tendency to drive the moving contact (4) to its second position through the baffle (64); The tripping system (8) is located inside the housing (1) and is used for fault tripping.

2. The miniature circuit breaker with a large opening distance according to claim 1, characterized in that... The contact frame (61) is mounted on the housing (1) via an intermediate shaft (11), and the latch (63) is hinged to the contact frame (61) via the intermediate shaft (11); the moving contact (4) is hinged to the contact frame (61) at the first mounting hole (611); the jump buckle (62) is hinged to the contact frame (61) via the second mounting hole (612); the latch (63) has a first position that cooperates with the jump buckle (62) and is linked with the moving contact, and a second position that is unlocked by rotating relative to the jump buckle (62); the moving contact (4) has a sliding hole (41), and the intermediate shaft (11) passes through the sliding hole (41) to make the moving contact (4) and the intermediate shaft (11) have a swing gap.

3. A large-pitch miniature circuit breaker according to claim 1, characterized in that... The baffle (64) is provided with a first protrusion (642), the housing (1) is provided with a protrusion (12), one end of the contact torsion spring (7) abuts against the protrusion (12), the other end of the contact torsion spring (7) abuts against the first protrusion (642) and has a tendency to drive the moving contact (4) to its second position through the first protrusion (642); the baffle (64) is provided with a limiting end (643) for limiting the movement of the moving contact (4), and the limiting end (643) abuts against the protrusion (12) when the moving contact (4) is in its second position.

4. A large-pitch miniature circuit breaker according to claim 1, characterized in that... The housing (1) is provided with a dividing edge (13), which divides the space inside the housing (1) into an operating space (14) and an arc extinguishing space (15). The moving contact (4) passes through the dividing edge (13) on the housing (1) from the operating space (14) and is located in the arc extinguishing space (15).

5. A large-pitch miniature circuit breaker according to claim 4, characterized in that... The baffle (64) is provided with a second protrusion (644), a third protrusion (645) and a baffle mounting part (646). The second protrusion (644), the third protrusion (645) and the baffle mounting part (646) cooperate with each other to form the slot (641) through which the moving contact (4) passes. The projections of the second protrusion (644) and / or the third protrusion (645) on the vertical plane exceed the projections of the baffle mounting part (646) and the dividing edge (13) on the vertical plane.

6. A large-pitch miniature circuit breaker according to claim 4, characterized in that... The separating edge (13) is arranged in an arc shape on the housing (1) along the movement trajectory of the moving contact (4), and the baffle (64) is located in the operating space (14) above the separating edge (13).

7. A large-pitch miniature circuit breaker according to claim 4, characterized in that... The arc extinguishing system (5) includes an arc extinguishing chamber (51), and there are two arc extinguishing chambers (51) located in the arc extinguishing space (15). One of the arc extinguishing chambers (51) is located on the path of the moving contact (4) when it moves from its first position to its second position.

8. A large-pitch miniature circuit breaker according to claim 1, characterized in that... It also includes an indicator (9) for indicating; the indicator (9) is hinged to the housing (1) and can rotate relative to the housing (1), and the contact frame (61) is provided with a lever (613) for driving the indicator (9) to rotate.

9. A large-pitch miniature circuit breaker according to claim 8, characterized in that... The indicator (9) is provided with an opening (91). The paddle (613) is inserted into the opening (91) and drives the indicator (9) to rotate relative to the housing (1) when the contact frame (61) rotates. When the moving contact (4) is in its first position and second position, the projection of the opening (91) on the horizontal plane falls on the left and right sides of the intermediate axis (11).

10. A large-pitch miniature circuit breaker according to claim 8, characterized in that... The latch (63) is provided with a support surface (631), and the jump buckle (62) is provided with a hook surface (621). The hook surface (621) and the support surface (631) are fitted together so that the latch (63) and the jump buckle (62) are linked together.

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