Circuit breaker

Abstract

The utility model discloses a breaker, which relates to the technical field of electrical equipment, and comprises a breaker body, measuring terminals and a protection assembly, the input current end and the output current end of the breaker are respectively provided with a first measuring terminal and a second measuring terminal, and the first measuring terminal and the second measuring terminal are respectively connected with the protection assembly. The outer wall of the first measuring terminal and the outer wall of the second measuring terminal are respectively covered with a protection component, when the contact resistance of the circuit breaker is measured, the protection component is taken down, the contact resistance measuring instrument is respectively in full contact with the first measuring terminal and the second measuring terminal, and the measuring terminals are reliably connected with the circuit breaker. Therefore, the technical effects of reducing the excessive resistance and reducing the measurement error are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of power equipment, and particularly relates to a circuit breaker. Background Art

[0002] A circuit breaker is an electrical device used for circuit protection. Its main function is to automatically cut off the circuit in case of overcurrent, short circuit or other faults to prevent damage to the electrical system and equipment. The structure of the circuit breaker includes a circuit breaker housing, a moving and static contact assembly, a tripping mechanism and a wiring terminal. In the prior art, due to the very small contact resistance value within the μ Ω range, and the circuit breaker only has main wiring terminals which are tightly connected by high-strength bolts. Long-term outdoor operation will cause oxidation, rust and dirt on the surface of the main wiring terminals. When measuring the contact resistance of the circuit breaker, the connecting wire of the measuring instrument can only be clamped on the surface of the main wiring terminals, resulting in a large measurement error, often exceeding the standard value, which affects the correct judgment of the equipment condition. Summary of the Utility Model

[0003] The main object of the utility model is to propose a circuit breaker, aiming to solve the problem of how to reduce the measurement error of the contact resistance of the circuit breaker.

[0004] To achieve the above object, the circuit breaker proposed by the utility model includes:

[0005] A circuit breaker body having an input current terminal and an output current terminal, and a wiring port is respectively provided at the input current terminal and the output current terminal;

[0006] A measuring terminal having a first measuring terminal and a second measuring terminal, the first measuring terminal is connected to the wiring port of the input current terminal, and the second measuring terminal is connected to the wiring port of the output current terminal; and

[0007] A protection component including a first protection member and a second protection member. The first protection member and the outer wall of the circuit breaker body enclose a first protection cavity, and the first measuring terminal is located in the first protection cavity; the second protection member and the outer wall of the circuit breaker body enclose a second protection cavity, and the second measuring terminal is located in the second protection cavity.

[0008] In an embodiment, the first protection member is detachably connected to the first measuring terminal, and the second protection member is detachably connected to the second measuring terminal.

[0009] In one embodiment, a connection block protrudes from one end of the first protection member close to the circuit breaker body. The first measurement terminal has a first connection section disposed at one end close to the circuit breaker body. Opposite connection holes are provided on the first connection section, and the connection block is inserted into the connection holes.

[0010] A connection block protrudes from one end of the second protection member close to the circuit breaker body. The second measurement terminal has a second connection section disposed at one end close to the circuit breaker body. Opposite connection holes are provided on the second connection section, and the connection block is inserted into the connection holes.

[0011] In one embodiment, the first connection section is provided with connection holes arranged in sequence. On one side of the first protection member close to the circuit breaker body, a plurality of connection blocks are provided, and the connection blocks are arranged in sequence along the length direction of the first protection member. Each connection block is correspondingly inserted into one of the connection holes.

[0012] The second connection section is provided with connection holes arranged in sequence. On one side of the second protection member close to the circuit breaker body, a plurality of connection blocks are provided, and the connection blocks are arranged in sequence along the length direction of the second protection member. Each connection block is correspondingly inserted into one of the connection holes.

[0013] In one embodiment, the first measurement terminal has a first connection section disposed at one end close to the circuit breaker body. External threads are provided on the outer wall of the first connection section, and internal threads are correspondingly provided at one end of the inner wall of the first protection member close to the circuit breaker body. The first measurement terminal is threadedly connected to the first protection member.

[0014] The second measurement terminal has a second connection section disposed at one end close to the circuit breaker body. External threads are provided on the outer wall of the second connection section, and internal threads are correspondingly provided at one end of the inner wall of the second protection member close to the circuit breaker body. The second measurement terminal is threadedly connected to the second protection member.

[0015] In one embodiment, sealing washers are provided on one side of the first protection member facing the circuit breaker body and on one side of the second protection member facing the circuit breaker body. The sealing washers are respectively in sealing contact with the outer walls of the first measurement terminal and the second measurement terminal.

[0016] In one embodiment, the circuit breaker body includes a first main wiring terminal at the input current end and a second main wiring terminal at the output current end. The first measurement terminal is connected to the first main wiring terminal, and the second measurement terminal is connected to the second main wiring terminal.

[0017] In one embodiment, the first main wiring terminal and the first measurement terminal are integrally formed; the second main wiring terminal and the second measurement terminal are integrally formed.

[0018] In one embodiment, the first protective member and the second protective member are made of a metal material or a plastic material.

[0019] The technical solution of the present utility model is to respectively provide a first measurement terminal and a second measurement terminal at the input current end and the output current end of the circuit breaker, and respectively cover a protection component on the outer wall of the first measurement terminal and the outer wall of the second measurement terminal. When the circuit breaker is operating normally, in order to avoid dirt on the surface of the measurement terminals, a first protective member and a second protective member are respectively covered on the outer walls of the first measurement terminal and the second measurement terminal, so as to achieve protection against surface oxidation, rust, and dirt. When the measuring instrument measures the contact resistance of the circuit breaker body, the measuring instrument is respectively connected to the first measurement terminal located at the input current end and the second measurement terminal located at the output current end for contact resistance measurement. This operation ensures the unity of the test position and also ensures the consistency of the contact resistance between the measuring clip and the measurement terminal. The existence of the protection component ensures the reliable connection between the measurement terminal and the circuit breaker. When measuring, the first protective member and the second protective member need to be removed, and the contact resistance measuring instrument is in full contact with the first measurement terminal and the second measurement terminal respectively, so that the measurement terminal is protected from physical damage, thereby achieving the technical effects of reducing excessive resistance and reducing measurement error. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0021] Figure 1 It is a top view structural schematic diagram of the circuit breaker provided by the present utility model in one embodiment;

[0022] Figure 2 For Figure 1 It is a front view structural schematic diagram of the circuit breaker;

[0023] Figure 3 It is a top view structural schematic diagram of the circuit breaker provided by the present utility model in another embodiment;

[0024] Figure 4 It is a top view structural schematic diagram of the circuit breaker provided by the present utility model in yet another embodiment.

[0025] Explanation of the reference numerals in the drawings:

[0026] 100, Circuit breaker; 1, Circuit breaker body; 11, Input current terminal; 111, First main wiring terminal; 12, Output current terminal; 121, Second main wiring terminal; 21, First measurement terminal; 22, Second measurement terminal; 221, Second connection section; 23, Connection hole; 31, First protection part; 32, Second protection part; 33, Connection block; 34, Sealing washer.

[0027] The realization, functional features and advantages of the purpose of the present utility model will be further described in conjunction with the embodiments and with reference to the accompanying drawings. Specific embodiments

[0028] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the protection scope of the present utility model.

[0029] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, then the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0030] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, then the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on what can be achieved by those of ordinary skill in the art. When the combination of technical solutions results in contradictions or cannot be achieved, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0031] The present utility model provides a circuit breaker 100.

[0032] In an embodiment of the present utility model, please refer to Figure 1 and Figure 2, in order to avoid large measurement errors of the circuit breaker during the measurement process, the circuit breaker includes: a circuit breaker body 1, measurement terminals, and a protection component. The circuit breaker body 1 has an input current terminal 11 and an output current terminal 12, and a wiring port is provided at each of the input current terminal 11 and the output current terminal 12; the measurement terminals have a first measurement terminal 21 and a second measurement terminal 22. The first measurement terminal 21 is connected to the wiring port of the input current terminal 11, and the second measurement terminal 22 is connected to the wiring port of the output current terminal 12; the protection component 3 includes a first protection member 31 and a second protection member 32. The first protection member 31 and the outer wall of the circuit breaker body 1 enclose a first protection cavity, and the first measurement terminal 21 is located in the first protection cavity; the second protection member 32 and the outer wall of the circuit breaker body 1 enclose a second protection cavity, and the second measurement terminal 22 is located in the second protection cavity.

[0033] In this embodiment, the circuit breaker body 1 is an electrical device mainly used for performing on-off operations of current in a circuit and providing protection in case of abnormal situations such as overload or short circuit to prevent equipment damage or safety accidents. The circuit breaker body 1 includes a contact system, an operating mechanism, a trip unit, etc. In this embodiment, the circuit breaker body 1 includes, but is not limited to, a GL334 model circuit breaker. In order to reduce the measurement error of the resistance, measurement terminals are added on one side of the circuit breaker close to the main wiring terminal. The measurement terminals are dedicated to measuring the resistance of electrical contact points. In order to prevent excessive resistance caused by rust, oxidation, and dirt on the measurement terminals, a protection component is provided on the outer wall of the measurement terminals. The protection component in this case can be a waterproof and dustproof cap with waterproof and dustproof functions. The materials with waterproof and dustproof functions here include, but are not limited to, metal materials such as stainless steel and aluminum alloy, and plastic materials such as polyethylene and polypropylene. The input current terminal 11 is the end where the current of the circuit breaker body 1 flows in, the output current terminal 12 is the end where the current of the circuit breaker body 1 flows out, and the wiring port is an interface component for connecting external wires. The first measurement terminal 21 is arranged on one side of the input current terminal 11, the second measurement terminal 22 is arranged on one side of the output current terminal 12, and the first measurement terminal 21 and the second measurement terminal 22 are respectively connected to the cables of the circuit breaker body 1 through the wiring ports and are connected by means of fixing bolts or welding.

[0034] The technical solution of the present utility model is to respectively provide a first measurement terminal 21 and a second measurement terminal 22 at the input current terminal 11 and the output current terminal 12 of the circuit breaker, and cover protection components on the outer walls of the first measurement terminal 21 and the second measurement terminal 22 respectively. When the circuit breaker operates normally, in order to avoid dirt on the surface of the measurement terminals, a first protection member 31 and a second protection member 32 are respectively covered outside the first measurement terminal 21 and the second measurement terminal 22, so as to achieve the technical effect of protecting against surface oxidation, rust, and dirt. When the measuring instrument measures the contact resistance of the circuit breaker body 1, the measuring instrument is respectively connected to the first measurement terminal 21 located at the input current terminal 11 and the second measurement terminal 22 located at the output current terminal 12 to measure the contact resistance. This operation ensures the unity of the test position and also ensures that the contact resistance between the measuring clip and the first measurement terminal 21 and the measurement terminal 22 is consistent. The existence of the protection component ensures the reliable connection between the first measurement terminal 21 and the measurement terminal 22 and the circuit breaker. When measuring, the first protection member 31 and the second protection member 32 need to be removed, and the contact resistance measuring instrument is in full contact with the first measurement terminal 21 and the second measurement terminal 22 respectively, so that the first measurement terminal 21 and the second measurement terminal 22 are protected from physical damage, thereby achieving the technical effects of reducing excessive resistance and reducing measurement error.

[0035] In an embodiment of the present utility model, the first protection member 31 is detachably connected to the first measurement terminal 21, and the second protection member 32 is detachably connected to the second measurement terminal 22. The first measurement terminal 21 is used for the measuring instrument to measure the contact resistance of current input, and the second measurement terminal 22 is used for measuring the contact resistance from the current output terminal. The protection member can be detachably connected to the first measurement terminal 21 and the second measurement terminal 22 respectively by means of snap connection, screw connection, etc. This detachable connection method facilitates the staff to quickly remove the protection component outside the measurement terminal 2 during measurement, and also reduces the time required for installation and disassembly.

[0036] In an embodiment of the present utility model, in order to ensure the reliable connection between the protection component and the measurement terminal, a connection block 33 protrudes from one end of the first protection member 31 close to the circuit breaker body 1. The first measurement terminal 21 has a first connection section, and the first connection section is arranged at one end close to the circuit breaker body 1. A connection hole 23 is provided opposite to the first connection section, and the connection block 33 is inserted into the connection hole 23; wherein a connection block 33 protrudes from one end of the second protection member 32 close to the circuit breaker body 1. The second measurement terminal 22 has a second connection section 221, and the second connection section 221 is arranged at one end close to the circuit breaker body 1. A connection hole 23 is provided opposite to the second connection section 221, and the connection block 33 is inserted into the connection hole 23. Please refer to Figure 3, both the first measurement terminal 21 and the second measurement terminal 22 are used to measure the contact resistance. Therefore, a first connection section and a second connection section 221 are respectively provided at one end of the first measurement terminal 21 and the second measurement terminal 22 close to the circuit breaker body. The first connection section is used to cooperate with and connect the first protection component 31, and the second connection section 221 is used to cooperate with and connect the second protection component 32. Taking the first measurement terminal 21 as an example, the shapes and sizes of the connection hole 23 and the connection block 33 are adapted to each other, so that when the connection block 33 is clamped with the connection hole 23, the outer wall of the first connection section of the first measurement terminal 21 abuts against and is limited by the inner wall of the first protection component 31. The connection blocks 33 are formed on both inner walls of the first protection component 31 facing the first measurement terminal 21, and the outer wall of the first measurement terminal 21 is relatively formed with convex portions protruding towards the outside of the first protection component 31, so that the first protection component 31 firmly covers the first measurement terminal 21. The arrangement of the second measurement terminal 22 and the second protection component 32 is the same as the above principle. This plug-in connection can quickly assemble or disassemble the protection component and the measurement terminal, improving the operation convenience and efficiency. At the same time, the plug-in connection helps to ensure the stable contact between the connection block 33 and the connection hole 23, reducing the possibility of loose fitting.

[0037] In an embodiment of the present utility model, one end of the first measurement terminal 21 close to the circuit breaker body has a first connection section, and the first connection section is provided with connection holes 23 arranged in sequence. One side of the first protection component 31 close to the circuit breaker body is provided with a plurality of connection blocks 33, and the connection blocks 33 are arranged in sequence along the length direction of the first protection component 31. Each connection block 33 is arranged corresponding to a plug-in connection with a connection hole 23; one end of the second measurement terminal 22 close to the circuit breaker body has a second connection section 221, and the second connection section 221 is provided with connection holes 23 arranged in sequence. One side of the second protection component 32 close to the circuit breaker body is provided with a plurality of connection blocks 33, and the connection blocks 33 are arranged in sequence along the length direction of the second protection component 32. Each connection block 33 is arranged corresponding to a plug-in connection with a connection hole 23. Taking the first measurement terminal 21 as an example, in order to ensure the reliable connection between the first protection component 31 and the first measurement terminal 21, the length of the first connection section should not be too long. The first connection section is provided with connection holes 23, and the first protection component 31 corresponds to the first connection section of the first measurement terminal 21 and is provided with connection blocks 33 at one end close to the circuit breaker body 1. A plurality of connection blocks 33 are arranged in a small section of length, ensuring uniform force distribution and the stability of the structure, and helping to achieve a better sealing effect. The arrangement of the second measurement terminal 22 and the second protection component 32 is the same as the above principle.

[0038] In an embodiment of the present utility model, the first measurement terminal 21 has a first connection section, which is arranged at one end close to the circuit breaker body 1. The outer wall of the first connection section is provided with an external thread, and the inner wall of the first protection part 31 is correspondingly provided with an internal thread at one end close to the circuit breaker body 1. The first measurement terminal 21 is threadedly connected to the first protection part 31; the second measurement terminal 22 has a second connection section 221, which is arranged at one end close to the circuit breaker body 1. The outer wall of the second connection section 221 is provided with an external thread, and the inner wall of the second protection part 32 is correspondingly provided with an internal thread at one end close to the circuit breaker body 1. The second measurement terminal 22 is threadedly connected to the second protection part 32. Combining Figure 4 , the first connection section is a small section of the first measurement terminal 21 for mating and connecting with the first protection part 31, and the second connection section 221 is a small section of the second measurement terminal 22 for mating and connecting with the second protection part 32. In order to ensure the quick installation and connection of the first protection part 31 and the first measurement terminal 21, as well as the quick installation and connection of the second protection part 32 and the second measurement terminal 22, and improve the connection tightness of the protection part and the measurement terminal, 2-3 turns of external threads are respectively arranged on the sides of the first measurement terminal 21 and the second measurement terminal 22 close to the circuit breaker body 1, and the inner walls of the corresponding first protection part 31 and the second protection part 32 are correspondingly designed with 2-3 turns of internal threads. The external thread on the outer wall of the measurement terminal meshes with the internal thread on the inner wall of the protection part, and the protection part is gradually tightened by rotation until the connection between the protection part and the measurement terminal is tight. The thread design on the inner and outer walls provides a clear installation guide, which is convenient for installation and maintenance and also improves the connection stability.

[0039] In an embodiment of the present utility model, sealing washers 34 are provided on the sides of the first protection part 31 facing the circuit breaker body 1 and the second protection part 32 facing the circuit breaker body 1. The sealing washers 34 are respectively in sealing contact with the outer walls of the first measurement terminal 21 and the second measurement terminal 22. In order to improve the connection sealing performance between the protection part and the measurement terminal, a sealing washer 34 is provided at one end of the inner wall of the protection part close to the wiring port. In this case, the sealing washer 34 is made of a material with corrosion resistance, high temperature resistance and excellent elasticity, which is not limited here. The sealing washer 34 is used to fill the microscopic gaps between the protection part and the measurement terminal to prevent liquids or other substances from contacting the measurement terminal through these gaps.

[0040] In an embodiment of the present utility model, the circuit breaker body 1 includes a first main wiring terminal 111 at the input current end 11 and a second main wiring terminal 121 at the output current end 12. The first measurement terminal 21 is connected to the first main wiring terminal 111, and the second measurement terminal 22 is connected to the second main wiring terminal 121. In order to ensure the reliability of the connection between the measurement terminal and the main wiring terminal, the measurement terminal is set to be connected to the main wiring terminal, which can ensure the stability and reliability of the contact to avoid the increase in resistance and potential heat problems caused by poor contact.

[0041] In an embodiment of the present utility model, the first main wiring terminal 111 and the first measurement terminal 21 are integrally formed; the second main wiring terminal 121 and the second measurement terminal 22 are integrally formed. In this case, taking the first main wiring terminal 111 and the first measurement terminal 21 as an example, in order to ensure that the first main wiring terminal 111 and the first measurement terminal 21 are consistent in electrical performance, so as to ensure the balance and stability of the electrical characteristics of the entire circuit system, the first measurement terminal 21 and the first main wiring terminal 111 are manufactured by the method of simultaneous casting, ensuring that the first measurement terminal 21 and the first main wiring terminal 111 are made of the same material, and the material here can be copper or copper alloy, which is not limited. This casting method reduces the manufacturing cost, enhances the electrical performance, and at the same time can ensure the accurate position of the measurement point, reduce the measurement error, and improve the measurement accuracy. The processing method of the second measurement terminal 22 is the same as that described above.

[0042] In an embodiment of the present utility model, the materials of the first protection member 31 and the second protection member 32 are metal materials or plastic materials. The metal materials here include materials such as stainless steel, aluminum, and iron, which are not limited here. The plastic materials here include materials such as polypropylene and polyethylene, which are not limited here.

[0043] The above description is only an exemplary embodiment of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present utility model.

Claims

1. A circuit breaker (100), characterized in that, The circuit breaker (100) includes: A circuit breaker body (1), the circuit breaker body (1) having an input current terminal (11) and an output current terminal (12), and a wiring port is respectively provided at the input current terminal (11) and the output current terminal (12); Measurement terminals, the measurement terminals having a first measurement terminal (21) and a second measurement terminal (22), the first measurement terminal (21) being connected to the wiring port of the input current terminal (11), and the second measurement terminal (22) being connected to the wiring port of the output current terminal (12); and A protection component, the protection component including a first protection member (31) and a second protection member (32), the first protection member (31) and the outer wall of the circuit breaker body (1) enclosing a first protection cavity, and the first measurement terminal (21) being located in the first protection cavity; the second protection member (32) and the outer wall of the circuit breaker body (1) enclosing a second protection cavity (122), and the second measurement terminal (22) being located in the second protection cavity.

2. The circuit breaker (100) according to claim 1, characterized in that, The first protection member (31) is detachably connected to the first measurement terminal (21), and the second protection member (32) is detachably connected to the second measurement terminal (22).

3. The circuit breaker (100) according to claim 2, characterized in that, One end of the first protection member (31) close to the circuit breaker body (1) protrudes with a connection block (33), the first measurement terminal (21) having a first connection section provided at one end close to the circuit breaker body (1), and connection holes (23) being oppositely provided on the first connection section, and the connection block (33) being inserted into the connection holes (23); One end of the second protection member (32) close to the circuit breaker body (1) protrudes with a connection block (33), the second measurement terminal (22) having a second connection section (221) provided at one end close to the circuit breaker body (1), and connection holes (23) being oppositely provided on the second connection section (221), and the connection block (33) being inserted into the connection holes (23).

4. The circuit breaker (100) according to claim 3, characterized in that, The first connection section is provided with connection holes (23) arranged in sequence, and multiple connection blocks (33) are provided on one side of the first protection member (31) close to the circuit breaker body (1), each of the connection blocks (33) being arranged in sequence along the length direction of the first protection member (31), and each connection block (33) being inserted into a corresponding connection hole (23); The second connection section (221) is provided with connection holes (23) arranged in sequence, and multiple connection blocks (33) are provided on one side of the second protection member (32) close to the circuit breaker body (1), each of the connection blocks (33) being arranged in sequence along the length direction of the second protection member (32), and each connection block (33) being inserted into a corresponding connection hole (23).

5. The circuit breaker (100) according to claim 2, characterized in that, The first measurement terminal (21) has a first connection section, which is arranged near one end of the circuit breaker body (1). The outer wall of the first connection section is provided with an external thread. The inner wall of the first protection member (31) near one end of the circuit breaker body (1) is correspondingly provided with an internal thread. The first measurement terminal (21) is threadedly connected to the first protection member (31). The second measurement terminal (22) has a second connection section (221), which is arranged near one end of the circuit breaker body (1). The outer wall of the second connection section (221) is provided with an external thread. The inner wall of the second protection member (32) near one end of the circuit breaker body (1) is correspondingly provided with an internal thread. The second measurement terminal (22) is threadedly connected to the second protection member (32).

6. The circuit breaker (100) according to claim 5, characterized in that, Sealing washers (34) are provided on one side of the first protection member (31) facing the circuit breaker body (1) and one side of the second protection member (32) facing the circuit breaker body (1). The sealing washers (34) are respectively in sealing contact with the outer walls of the first measurement terminal (21) and the second measurement terminal (22).

7. The circuit breaker (100) according to claim 1, characterized in that, The circuit breaker body (1) includes a first main connection terminal (111) at the input current end (11) and a second main connection terminal (121) at the output current end (12). The first measurement terminal (21) is connected to the first main connection terminal (111), and the second measurement terminal (22) is connected to the second main connection terminal (121).

8. The circuit breaker (100) according to claim 7, characterized in that, The first main connection terminal (111) and the first measurement terminal (21) are integrally formed. The second main connection terminal (121) and the second measurement terminal (22) are integrally formed.

9. The circuit breaker (100) according to claim 1, characterized in that, The first protection member (31) and the second protection member (32) are made of a metal material or a plastic material.

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