Combined circuit breaker of multi-breakpoint contact system

Abstract

The invention discloses a multi-breakpoint contact system combined circuit breaker, and belongs to the technical field of circuit breakers. Comprising a circuit breaker which is internally provided with a circuit breaker contact arc extinguishing system; the contact module is internally provided with a module contact arc extinguishing system, the module contact arc extinguishing system of each pole is formed by connecting two groups of symmetrically arranged single-breakpoint contact arc extinguishing structures in series so as to form the module contact arc extinguishing system with double breakpoints, and each single-breakpoint contact arc extinguishing structure comprises a module moving contact, a module static contact and a module arc extinguishing chamber; the circuit breaker is connected with the contact module up and down, and the wiring end of the circuit breaker is connected with the wiring end of the contact module in series; the module contact arc extinguishing system is provided with multiple poles in parallel along the width direction of the contact module, and the module contact arc extinguishing system of each pole is arranged along the length direction of the contact module. The contact module serves as an independent function unit and is rapidly combined with the circuit breaker to form a multi-breakpoint breaking structure, efficient current limiting and arc extinguishing are achieved, and economic benefits are improved.

Description

Technical Field

[0001] This invention belongs to the field of circuit breaker technology, specifically relating to a multi-break contact system combined circuit breaker. Background Technology

[0002] With the increasing demands for safety and reliability in modern power systems, higher requirements are being placed on the short-circuit breaking capacity of circuit breakers in low-voltage power distribution systems (especially the ultimate short-circuit breaking capacity Icu and the operational short-circuit breaking capacity Ics).

[0003] Traditional molded case circuit breakers (MCCBs) generally adopt a single-break contact structure, that is, each pole contains only a single break consisting of a moving contact and a stationary contact. When breaking short-circuit current, the arc energy is concentrated and the arc voltage is low, which makes it difficult to extinguish the arc and has limited current limiting capacity. It is difficult to meet the application requirements of high short-circuit current applications (such as large industrial power distribution, data centers, new energy grid-connected systems, etc.).

[0004] To improve breaking performance, the industry has developed double-break circuit breakers, which divide the arc into two segments by setting two series breaks in a single pole, thereby increasing the total arc voltage and enhancing the current limiting effect.

[0005] However, most existing double-break circuit breakers adopt an integrated design, which is complex in structure and large in size. Furthermore, the mold development cost is high and the product series expansion is difficult. In addition, their breaking capacity is usually limited to 100kA to 150kA (400V AC), which is still insufficient when facing extreme short-circuit conditions (such as expected short-circuit current exceeding 150kA). Summary of the Invention

[0006] This invention addresses the aforementioned problems in existing technologies by proposing a multi-break contact system combined circuit breaker that features a reasonable structure, superior performance, controllable cost, and high scalability.

[0007] This invention can be achieved through the following technical solutions: A multi-break contact system combined circuit breaker, comprising: A circuit breaker having a circuit breaker contact arc extinguishing system, wherein each pole of the circuit breaker contact arc extinguishing system includes at least one circuit breaker moving contact, a circuit breaker stationary contact, and a circuit breaker arc extinguishing chamber. The contact module contains a module contact arc extinguishing system. The module contact arc extinguishing system of each pole is composed of two sets of symmetrically arranged single-break contact arc extinguishing structures connected in series to form a module contact arc extinguishing system with double breaks. The single-break contact arc extinguishing structure includes a module moving contact, a module stationary contact, and a module arc extinguishing chamber. The circuit breaker is connected vertically to the contact module, and the terminals of the circuit breaker are connected in series with the terminals of the contact module. The module contact arc extinguishing system is provided with multiple poles arranged in parallel along the width direction of the contact module, and the module contact arc extinguishing system of each pole is arranged along the length direction of the contact module.

[0008] As a further improvement of the present invention, the modular contact arc extinguishing system of one pole includes a mounting frame, two modular arc extinguishing chambers are symmetrically distributed at both ends of the mounting frame, and two sets of single-break contact arc extinguishing structures are respectively connected to the mounting frame and extend into their respective modular arc extinguishing chambers.

[0009] As a further improvement of the present invention, the single-break contact arc-extinguishing structure includes: A rotating shaft, which passes through the mounting bracket; A spring is mounted on the shaft; An actuating rod is connected at one end to the rotating shaft and the other end is fitted with the moving contact of the module. The spring always provides the actuating rod with elastic force in the direction of the stationary contact of the module.

[0010] As a further improvement of the present invention, in the arc extinguishing system of the module contact in one pole, the bottom of the actuating rod of the two sets of single-break contact arc extinguishing structures is provided with a support frame.

[0011] As a further improvement of the present invention, in the single-pole module contact arc extinguishing system, the module moving contact and the module stationary contact of the two sets of single-break contact arc extinguishing structures are synchronously separated or made into contact.

[0012] As a further improvement of the present invention, the module stationary contact is disposed in the module arc extinguishing chamber and located at the bottom position.

[0013] As a further improvement of the present invention, when the circuit breaker is subjected to overload current or low short-circuit current, the moving contact of the circuit breaker separates from the stationary contact of the circuit breaker, and the moving contact of the module and the stationary contact of the module maintain a closed contact state under the action of the spring.

[0014] As a further improvement of the present invention, when the circuit breaker passes a high short-circuit current... The moving contact of the circuit breaker remains separated from the stationary contact of the circuit breaker, while the moving contact of the module and the stationary contact of the module quickly separate under the action of electromagnetic repulsion.

[0015] As a further improvement of the present invention, the circuit breaker can be installed in the contact module in either the forward or reverse direction, wherein, When the circuit breaker is installed in the forward direction, the moving contact and the stationary contact of the circuit breaker are located at the upper end of the circuit breaker. When the circuit breaker is installed in reverse, the moving contact and the stationary contact of the circuit breaker are located at the lower end of the circuit breaker.

[0016] As a further improvement of the present invention, when the circuit breaker is installed in the forward direction, the upper end of the circuit breaker is wired to form a wiring pattern of upper incoming line and lower outgoing line; When the circuit breaker is installed in reverse, the lower end of the circuit breaker is wired to form a wiring pattern of bottom inlet and top outlet.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. Significantly improve short-circuit breaking capacity: By combining the circuit breaker with the double-break contact module, a three-break (or four-break) series breaking structure is formed, making the arc voltage much higher than the voltage that each break point can withstand, achieving efficient current limiting and arc extinguishing. Ultra-high breaking capacity products with a short-circuit breaking capacity of 150kA to 200kA under AC 400V can be developed, and it can be extended to 1600V to 2000V DC applications to meet the needs of high-end scenarios such as new energy.

[0019] 2. Modular design reduces costs and development risks: The contact module, as an independent functional unit, can be quickly combined with existing mature circuit breaker platforms without reconstructing the overall structure, which greatly reduces mold investment, shortens the R&D cycle, and facilitates serialized production, maintenance upgrades and performance expansion.

[0020] 3. Intelligent hierarchical response mechanism balances reliability and lifespan: In the event of overload or low short circuit, only the basic circuit breaker operates, while the module remains closed; the module automatically opens to participate in the breaking only in the event of a high current short circuit. This mechanism avoids unnecessary multi-point breaking, extends contact life, and ensures high-reliability breaking under extreme fault conditions.

[0021] 4. Optimized spatial layout enhances arc extinguishing performance and structural stability: Each pole within the module has two breakpoints along its length, which, together with the symmetrical mounting frame, shared support frame, and bottom static contact design, achieve synchronized operation, arc isolation, heat dissipation, and mechanical stability, effectively preventing arc crosstalk and timing deviations, and improving breakout consistency and safety.

[0022] 5. Enhanced engineering adaptability through bidirectional wiring compatibility: By rotating the contact module 180°, two wiring methods can be achieved: "top in, bottom out" or "bottom in, top out". The main circuit path is short and straight, with low contact resistance, and does not affect the three-break point coordinated breaking performance. It can flexibly adapt to various distribution cabinet layouts, simplify installation and selection, and improve product versatility and field applicability. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the multi-break contact system combined circuit breaker of the present invention; Figure 2 This is a schematic diagram of the separate structure of the circuit breaker and contact module of the present invention; Figure 3 This is a schematic diagram of the split structure of the upper and lower housings of the contact module of the present invention; Figure 4 This is a schematic diagram of the internal structure of the upper housing of the contact module of the present invention; Figure 5 This is an exploded view of the operating mechanism of the modular contact arc extinguishing system of the present invention; Figure 6 This is an exploded view of the lower housing of the contact module of the present invention; Figure 7 This is a schematic diagram of the current direction of the circuit breaker and contact module of the present invention; Figure 8 This is a schematic diagram of the single-break circuit breaker and contact module of the present invention in normal working condition; Figure 9 This is a schematic diagram of the single-break circuit breaker and contact module of the present invention in overload and low short-circuit tripping states; Figure 10 This is a schematic diagram of the single-break circuit breaker and contact module of the present invention in the case of high-current short-circuit tripping state; Figure 11 This is a schematic diagram of the double-break circuit breaker and contact module of the present invention in normal working condition.

[0024] In the diagram, 100 is the circuit breaker; 110 is the moving contact of the circuit breaker; 120 is the stationary contact of the circuit breaker; 200 is the contact module; 201 is the upper housing; 2011 is the copper guide post; 202 is the lower housing; 210 is the module contact arc extinguishing system; 220 is the module moving contact; 230 is the module stationary contact; 240 is the module arc extinguishing chamber; 250 is the mounting bracket; 260 is the rotating shaft; 270 is the spring; 280 is the operating rod; and 290 is the support frame. Detailed Implementation

[0025] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings to further illustrate the technical methods of the present invention. However, the present invention is not limited to these embodiments.

[0026] like Figures 1-11 As shown, the present invention provides a multi-break contact system combined circuit breaker, comprising: The circuit breaker 100 has a circuit breaker 100 contact arc extinguishing system. Each pole of the circuit breaker 100 contact arc extinguishing system includes at least one circuit breaker moving contact 110, a circuit breaker stationary contact 120, and a circuit breaker 100 arc extinguishing chamber. The contact module 200 has a module contact arc extinguishing system 210. Each pole's module contact arc extinguishing system 210 is composed of two sets of symmetrically arranged single-break contact arc extinguishing structures connected in series to form a module contact arc extinguishing system 210 with double breaks. The single-break contact arc extinguishing structure includes a module moving contact 220, a module stationary contact 230, and a module arc extinguishing chamber 240. The circuit breaker 100 and the contact module 200 are connected by stacking, and the terminals of the circuit breaker 100 and the terminals of the contact module 200 are electrically connected in series, thus forming a complete multi-break circuit.

[0027] This structural design combines a traditional circuit breaker 100 with an independent double-break contact module 200 in series to form a multi-break breaking system. This significantly improves the overall short-circuit breaking capacity without altering the original main structure of the circuit breaker 100. For example: The double-break contact module 200 and the single-break circuit breaker 100 are combined vertically to form a three-break combined circuit breaker 100. The double-break contact module 200 and the double-break circuit breaker 100 can be combined vertically to form a four-break combination circuit breaker.

[0028] It should be noted that when the circuit breaker 100 interrupts a large current, the arc generated enters the arc extinguishing chamber and is cut into multiple short arcs by the metal grid. Each short arc has a voltage drop of 20~25V. The arc voltage has a current limiting effect. If the arc voltage is greater than the instantaneous value of the power supply voltage, its short-circuit current is forcibly reduced instantaneously until the arc is extinguished.

[0029] Taking a 400V AC power distribution system (phase voltage 230V) as an example: If we estimate that the voltage drop of each short arc is 20V: In a 400V power distribution line, the phase voltage of a single-break circuit breaker 100 is 230V. If the selected arc-extinguishing chamber has 15 metal grid plates, when a large short-circuit current is interrupted, the arc entering the arc-extinguishing chamber is divided into 14 short arcs, forming an arc voltage of about 280V, which is higher than the phase voltage of 230V, thus playing a role in current limiting and interruption.

[0030] Similarly, when the single-break circuit breaker 100 and the module are combined to form a three-break circuit breaker 100, operating in a 400V power distribution line with a phase voltage of 230V, the single-break circuit breaker 100 still uses an arc-extinguishing chamber with 15 metal grids, while the two contact breaks of the module each use an arc-extinguishing chamber with 10 metal grids. Thus, the three-break circuit breaker 100 has 3 contact breaks per phase circuit, and the average voltage of each contact break is about one-third of 230V, which is 76.6V. At this time, when breaking a large current short circuit, the arc-extinguishing chamber of the single-break circuit breaker 100 generates an arc voltage of 280V, and each arc-extinguishing chamber of the module generates an arc voltage of 180V, both of which are much higher than the contact break voltage of 76.6V. The current limiting breaking effect is more obvious, which is of great benefit to improving the breaking capacity of large short-circuit currents.

[0031] Therefore, based on the characteristics of the three break points and three arc-extinguishing chambers mentioned above, a product with a short-circuit breaking capacity of 150kA~200kA for AC 400V can be developed. It is smaller in size, has a higher breaking capacity, and is cheaper. It can also be used to derive a two-pole 1600V~2000V DC circuit breaker 100 to meet the needs of new energy development.

[0032] In addition, in terms of installation layout, the circuit breaker 100 and the contact module 200 are connected by being installed vertically. The two are directly connected in series through vertical conductive connectors (such as copper busbars or cylindrical conductors). The main circuit path is short and straight, with low contact resistance, low temperature rise, and high electrical connection reliability.

[0033] Furthermore, because the circuit breaker 100 and the contact module 200 are installed vertically, the circuit breaker 100 can be rotated 180° to achieve two wiring modes: "top in, line out" or "bottom in, line out". This adapts to the line in / out direction requirements of different distribution cabinets and improves the adaptability of the project.

[0034] Furthermore, in the internal mounting layout of the contact module 200: The modular contact arc extinguishing system 210 is arranged in parallel with multiple poles along the width direction of the contact module 200, ensuring that there is sufficient electrical clearance and creepage distance between each pole of the modular contact arc extinguishing system 210, effectively preventing phase-to-phase arc short circuit, meeting high insulation safety requirements, and at the same time facilitating one-to-one alignment with each pole of the circuit breaker 100 to achieve precise electrical connection. The module contact arc extinguishing system 210 of each pole is arranged along the length of the contact module 200, which effectively utilizes the longitudinal space and avoids insufficient electrical clearance or structural interference caused by lateral congestion. This ensures a reasonable layout of each component. At the same time, the two arc extinguishing chambers can be located at the two ends of the length or on both sides of the center, forming physically separated areas. This layout is conducive to establishing independent magnetic field environments, reducing mutual coupling or crosstalk of the arc during the breaking process, and improving arc extinguishing efficiency and stability.

[0035] In addition, since the two break point contact arc extinguishing structures are symmetrically arranged in the module contact arc extinguishing system 210 of one pole, when the electromagnetic repulsion drives the contact to break, the symmetrical arrangement along the length direction can ensure that the moving contacts on both sides are subjected to uniform force and have consistent motion trajectories. This enables the module moving contacts 220 and module stationary contacts 230 of the two sets of single break point contact arc extinguishing structures to separate or contact synchronously. During synchronous separation, the arc is generated at the same time and enters their respective corresponding arc extinguishing chambers. This avoids the problem of a certain break point bearing excessively high instantaneous voltage or energy due to timing differences, thus improving the overall breaking reliability.

[0036] In general, in the contact module 200, the arc extinguishing systems 210 of each pole module are arranged side by side along the width direction, and the arc extinguishing systems 210 of a single pole module are arranged along the length direction. This layout mode is a key layout strategy to achieve high-density integration, high-reliability arc extinguishing and good manufacturability in the spatial dimension.

[0037] Preferably, the single-pole modular contact arc extinguishing system 210 includes a mounting frame 250, two modular arc extinguishing chambers 240 are symmetrically distributed at both ends of the mounting frame 250, and two sets of single-break contact arc extinguishing structures are respectively connected to the mounting frame 250 and extend into their respective modular arc extinguishing chambers 240.

[0038] This symmetrical layout ensures balanced force distribution and high motion synchronization of the contact systems on both sides, effectively avoiding skewed action or timing differences. At the same time, the mounting bracket 250, as the core support component, facilitates the integration and positioning of the moving contact transmission mechanism (such as the rotating shaft 260, spring 270, and actuating rod 280), ensuring reliable arc transmission into their respective arc-extinguishing chambers, significantly enhancing breakage consistency, arc-extinguishing efficiency, and product reliability.

[0039] Preferably, the single-break contact arc-extinguishing structure includes: A rotating shaft 260 is mounted on a mounting bracket 250. Spring 270 is mounted on pivot 260; The actuating lever 280 has one end connected to the rotating shaft 260 and the other end mounted with the module moving contact 220. The spring 270 always provides the actuating lever 280 with elastic force in the direction of the module stationary contact 230.

[0040] The structure forms a stable rotation fulcrum with the rotating shaft 260 and the mounting bracket 250. The preload of the spring 270 ensures that the moving contact 220 of the module can reliably close with the stationary contact 230 of the module under normal working conditions. When a large short-circuit current occurs, the electromagnetic repulsion force quickly overcomes the force of the spring 270 and drives the actuating rod 280 to rotate around the rotating shaft 260, so that the moving contact is quickly repelled and high-speed disconnection is achieved.

[0041] The design features a simple structure, sensitive operation, and stable reset, ensuring electrical continuity in the closed state and enabling timely and reliable arc generation and separation in case of faults, significantly improving the response speed and breaking reliability of the contact module 200.

[0042] In the arc extinguishing system 210 of the single-pole module contact, a support frame 290 is provided at the bottom of the actuating rod 280 of the two sets of single-break contact arc extinguishing structures. When no large short-circuit current is generated, the support frame 290 plays a limiting support role for the actuating rod 280, ensuring that the module moving contact 220 maintains a precise closed position and stable contact pressure under normal operating conditions, and preventing poor contact due to mechanical loosening or external vibration.

[0043] In addition, the outer shell of the contact module 200 is composed of an upper shell 201 and a lower shell 202. The upper shell 201 of the contact module 200 is equipped with copper guide posts 2011, so that the contact module 200 and the circuit breaker 100 are connected in the main circuit to form a multi-break circuit breaker structure.

[0044] The actuation mechanism of the modular contact arc extinguishing system 210 (including mounting bracket 250, rotating shaft 260, spring 270, actuating rod 280, and modular moving contact 220) is located in the upper housing 201, and the modular arc extinguishing chamber 240 is located in the lower housing 202.

[0045] This split-shell structure design has the following advantages: On the one hand, the action mechanism of the modular contact arc extinguishing system 210 and the modular arc extinguishing chamber 240 are placed in the upper and lower shells respectively, which realizes clear functional division and simplified assembly process. The action mechanism can be pre-installed in the upper shell 201 and the modular arc extinguishing chamber 240 can be independently installed in the lower shell 202. Then, the whole machine is integrated by closing the shells, which greatly improves production efficiency and assembly accuracy. On the other hand, it is easy to maintain and replace. If the contacts need to be inspected or the arc-extinguishing grid needs to be replaced, the corresponding housing can be opened separately without disassembling the whole structure.

[0046] Preferably, the module stationary contact 230 is located inside the module arc-extinguishing chamber 240 and at the bottom. This arrangement allows the arc to be quickly guided into the arc-extinguishing chamber after it is generated, and to move upward or toward the grid area along a preset path under the action of the magnetic field and hot airflow, which is beneficial for the rapid elongation, cooling and splitting of the arc.

[0047] To better illustrate the principle, the following are state descriptions for three different operating conditions:

[0048] 1. During normal working conditions When the current passing through the circuit breaker 100 is less than or equal to the rated current, the moving contact 110 of the circuit breaker is always in close contact with the stationary contact 120 of the circuit breaker under the action of the spring 270 and maintains a certain contact pressure. At the same time, the moving contact 220 of the module is in close contact with the stationary contact 230 of the module under the force of the spring 270 and maintains a certain contact pressure. The circuit breaker 100 is in normal working condition.

[0049] 2. Tripping under overload and low-level short-circuit conditions When the circuit breaker 100 is subjected to an overload current (e.g., 1.2In~6In) or a low short-circuit current (e.g., 10In~20In), the circuit breaker 100 operates under the action of the overload trip unit or the instantaneous trip unit, causing the moving contact 110 of the circuit breaker to quickly separate from the stationary contact 120 of the circuit breaker, thus disconnecting the faulty circuit. At the same time, the moving contact 220 of the module remains in close contact with the stationary contact 230 of the module under the force of the spring 270, and maintains a certain contact pressure, thus being in a reliable contact state.

[0050] 3. High-current short-circuit tripping condition (Note: Ics: rated operating short-circuit breaking capacity; Icu: rated ultimate short-circuit breaking capacity. These two indicators are key indicators for verifying the performance of the circuit breaker.) When the circuit breaker 100 passes a large short-circuit current (e.g., Ics and Icu), the circuit breaker 100 operates under the action of the instantaneous trip unit, causing the moving contact 110 of the circuit breaker to quickly separate from the stationary contact 120. At the same time, the module moving contact 220, under the combined action of the electromagnetic repulsion force (Hohm force or node repulsion force) between its moving and stationary contacts and the electromagnetic force (Lorentz force or loop repulsion force) between the circuits, overcomes the force of the spring 270, and the module moving contact 220 is quickly repelled. At this time, the fault circuit instantly forms three contact breaks, quickly disconnecting the large short-circuit current loop.

[0051] This "intelligent hierarchical response" mechanism not only significantly improves the ultimate short-circuit breaking capacity (up to 150kA~200kA), but also takes into account operational reliability, contact life and cost-effectiveness. It effectively solves the problems of insufficient breaking capacity, large size or complex structure of traditional circuit breakers 100 in high short-circuit capacity scenarios, and is particularly suitable for application scenarios with stringent protection performance requirements, such as high-end industrial power distribution and new energy systems.

[0052] Preferably, the circuit breaker 100 can be installed in the contact module 200 in either the forward or reverse direction, wherein, When the circuit breaker 100 is installed in the forward direction, the moving contact 110 and the stationary contact 120 of the circuit breaker are located at the upper end of the circuit breaker 100. When the circuit breaker 100 is installed in reverse, the moving contact 110 and the stationary contact 120 of the circuit breaker are located at the lower end of the circuit breaker 100.

[0053] Based on this, two wiring modes can be formed: top-inlet + bottom-outlet and bottom-inlet + top-outlet. Specifically: In practical applications, the structure consisting of circuit breaker 100 and contact module 200 is installed vertically rather than horizontally. Therefore, the incoming terminal of circuit breaker 100 after installation is located at the upper or lower position. When the circuit breaker 100 is installed in the forward direction, the upper end of the circuit breaker 100 is wired to form a wiring pattern of upper incoming line and lower outgoing line. When circuit breaker 100 is installed in reverse (rotated 180° compared to its forward installation), the lower end of circuit breaker 100 is wired to form a wiring pattern of bottom inlet and top outlet.

[0054] It should be noted that, since the operating mechanism inside the circuit breaker 100 cannot be energized when the moving contact 110 and the stationary contact 120 of the circuit breaker are disconnected, when the circuit breaker 100 is installed in the forward direction, the wire can be brought in from the upper position of the circuit breaker 100 to avoid the operating mechanism inside the circuit breaker 100. Conversely, when the circuit breaker 100 is installed in the reverse direction, the wire can be brought in from the lower position of the circuit breaker 100 to avoid the operating mechanism inside the circuit breaker 100.

[0055] Therefore, by setting the contact module 200, the circuit breaker 100 can be compatible with both top-in and bottom-in layouts simply by adjusting the installation direction of the circuit breaker 100 on the contact module 200, without changing the structure of the circuit breaker 100, thus improving its adaptability and versatility during use.

[0056] The technical means disclosed in this invention are not limited to those described above, but also include technical solutions composed of any combination of the above technical features. The above are specific embodiments of this invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this invention, and these improvements and modifications are also considered within the scope of protection of this invention.

[0057] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0058] Furthermore, in this invention, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0059] The technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0060] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A multi-break contact system combination circuit breaker, characterized by, include: A circuit breaker having a circuit breaker contact arc extinguishing system, wherein each pole of the circuit breaker contact arc extinguishing system includes at least one circuit breaker moving contact, a circuit breaker stationary contact, and a circuit breaker arc extinguishing chamber. The contact module contains a module contact arc extinguishing system. The module contact arc extinguishing system of each pole is composed of two sets of symmetrically arranged single-break contact arc extinguishing structures connected in series to form a module contact arc extinguishing system with double breaks. The single-break contact arc extinguishing structure includes a module moving contact, a module stationary contact, and a module arc extinguishing chamber. The circuit breaker is connected vertically to the contact module, and the terminals of the circuit breaker are connected in series with the terminals of the contact module. The module contact arc extinguishing system is provided with multiple poles arranged in parallel along the width direction of the contact module, and the module contact arc extinguishing system of each pole is arranged along the length direction of the contact module.

2. A multiple-break contact system combination circuit breaker according to claim 1, wherein, The modular contact arc extinguishing system of one pole includes a mounting frame, two modular arc extinguishing chambers are symmetrically distributed at both ends of the mounting frame, and two sets of single-break contact arc extinguishing structures are respectively connected to the mounting frame and extend into their respective modular arc extinguishing chambers.

3. A multiple-break contact system combination circuit breaker according to claim 2 wherein, The single-breakpoint contact arc-extinguishing structure includes: A rotating shaft, which passes through the mounting bracket; A spring is mounted on the shaft; An actuating rod is connected at one end to the rotating shaft and the other end is fitted with the moving contact of the module. The spring always provides the actuating rod with elastic force in the direction of the stationary contact of the module.

4. A multiple-break contact system combination circuit breaker according to claim 3 wherein, In the arc extinguishing system of the module contact described in the first pole, a support frame is provided at the bottom of the actuating rod of the two sets of single-break contact arc extinguishing structures.

5. A multiple-break contact system combination circuit breaker according to claim 1 wherein, In the single-pole module contact arc extinguishing system, the moving contacts and stationary contacts of the two sets of single-break contact arc extinguishing structures are synchronously separated or made into contact.

6. A multi-break contact system combined circuit breaker according to claim 1, characterized in that, The stationary contact of the module is disposed in the arc-extinguishing chamber of the module and is located at the bottom.

7. A multi-break contact system combined circuit breaker according to claim 3, characterized in that, When the circuit breaker is subjected to overload current or low short-circuit current, the moving contact of the circuit breaker separates from the stationary contact of the circuit breaker, and the moving contact of the module and the stationary contact of the module remain in a closed contact state under the action of the spring.

8. A multi-break contact system combined circuit breaker according to claim 1, characterized in that, When the circuit breaker is subjected to a high short-circuit current, the moving contact of the circuit breaker remains separated from the stationary contact of the circuit breaker, while the moving contact of the module and the stationary contact of the module quickly separate under the action of electromagnetic repulsion.

9. A multi-break contact system combined circuit breaker according to claim 1, characterized in that, The circuit breaker can be installed in either the forward or reverse direction on the contact module, wherein... When the circuit breaker is installed in the forward direction, the moving contact and the stationary contact of the circuit breaker are located at the upper end of the circuit breaker. When the circuit breaker is installed in reverse, the moving contact and the stationary contact of the circuit breaker are located at the lower end of the circuit breaker.

10. A multi-break contact system combined circuit breaker according to claim 9, characterized in that, When the circuit breaker is installed in the forward direction, the upper end of the circuit breaker is wired to form a wiring pattern of upper incoming line and lower outgoing line; When the circuit breaker is installed in reverse, the lower end of the circuit breaker is wired to form a wiring pattern of bottom inlet and top outlet.

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