A circuit breaker

Abstract

A kind of circuit breaker, including a pair of terminal, contact mechanism is connected between the pair of terminal, the contact mechanism includes the movable contact and static contact that cooperate with each other, arc-extinguishing chamber is provided with in the side of static contact, arc striking structure is arranged between arc-extinguishing chamber and contact mechanism, the arc striking structure includes the arc striking horn below static contact, arc striking coil is equipped in the side of arc striking horn, two ends of arc striking coil are electrically connected with a terminal and arc striking horn respectively, and the break point between arc striking horn and static contact is formed, so that arc current passing through arc striking horn does not pass through static contact.The arc striking coil of the application forms electromagnetic field, so that arc is rapidly transferred to arc-extinguishing chamber under the action of electromagnetic field, with the advantages of low manufacturing cost, arc extinguishing rapidly, at the same time, arc passing through arc striking horn no longer passes through static contact, to avoid long time contact arc to burn out contact mechanism.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical appliances, and more specifically to a circuit breaker. Background Technology

[0002] A circuit breaker is a common low-voltage electrical device. When a circuit breaker breaks a circuit, the gas between the moving contact and the stationary contact generates an electric arc under the action of a strong electric field. Because the arc temperature is high, it can easily burn out the contacts. Therefore, circuit breakers are usually equipped with an arc-extinguishing structure to extinguish the arc.

[0003] Because most existing DC circuit breakers have polarity requirements, permanent magnets are usually installed to extinguish arcs, ensuring that the direction of the internal magnetic field cannot be changed. This causes the DC current to flow in one direction, thus achieving normal connection or disconnection. This increases the production cost and difficulty, and also makes quality control difficult. Non-polarity means that the circuit breaker can have the upper terminal for incoming wires and the lower terminal for outgoing wires, or vice versa. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a circuit breaker that is easy to manufacture and has a rapid arc extinguishing capability.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A circuit breaker includes a pair of terminals, with a contact mechanism connected between the terminals. The contact mechanism includes a moving contact and a stationary contact that cooperate with each other. An arc-extinguishing chamber is provided on one side of the stationary contact. An arc-inducing structure is provided between the arc-extinguishing chamber and the contact mechanism. The arc-inducing structure includes an arc-inducing angle located below the stationary contact. An arc-inducing coil is provided on one side of the arc-inducing angle. The two ends of the arc-inducing coil are electrically connected to a terminal and the arc-inducing angle, respectively, forming a break between the arc-inducing angle and the stationary contact, so that the arc current flowing through the arc-inducing angle does not pass through the stationary contact.

[0007] Furthermore, a short-circuit protection mechanism is provided on one side of the stationary contact, and the arc-starting coil is located between the stationary contact and the short-circuit protection mechanism. One end of the arc-starting coil is connected to the terminal block through the short-circuit protection mechanism.

[0008] Furthermore, a gap is reserved between the arc-starting angle and the stationary contact to form a break point, and an insulating partition is provided within the gap.

[0009] Furthermore, the arc-initiating structure also includes an arc-initiating plate, which is arranged opposite to the arc-initiating angle to form an arc-initiating channel between the contact mechanism and the arc-extinguishing chamber, and the arc-initiating coil is located outside the arc-initiating channel on one side of the arc-initiating angle.

[0010] Furthermore, the first end of the arc-starting angle and the first end of the arc-starting plate extend into the arc-extinguishing chamber, the second end of the arc-starting angle is electrically connected to a terminal through the arc-starting coil and the short-circuit protection mechanism, and the second end of the arc-starting plate is electrically connected to another terminal.

[0011] Furthermore, it also includes an overload protection mechanism, which is respectively disposed on both sides of the moving contact with the stationary contact. The arc-starting plate, the moving contact, and the overload protection mechanism are electrically connected to the same terminal block.

[0012] Furthermore, the stationary contact includes a stationary contact plate, with a contact point in the middle of the stationary contact plate that cooperates with the moving contact. One end of the stationary contact plate is connected to the short-circuit protection mechanism, and the other end of the stationary contact plate has a gap with the second end of the arc-starting angle and together they surround the outside of the arc-starting coil.

[0013] Furthermore, the arc-initiating coil has a spiral structure, with its central axis perpendicular to the central axis of the instantaneous coil of the short-circuit protection mechanism. One end of the arc-initiating coil is electrically connected to the instantaneous coil, and the other end is electrically connected to the arc-initiating angle coil.

[0014] Furthermore, it also includes a housing, which includes a base and a top cover that overlap each other, a receiving groove is provided in the middle of the base and / or the top cover, and a fixing part for assembling an arc-starting coil is provided in the middle of the receiving groove.

[0015] Furthermore, the receiving groove is a U-shaped groove with an opening facing the short-circuit protection mechanism, allowing one end of the arc-starting coil to pass through the opening and connect to the short-circuit protection mechanism. The second end of the arc-starting angle is set along the outer side of the side wall of the receiving groove, and the other end of the arc-starting coil passes through the side wall of the receiving groove and connects to the second end of the arc-starting angle. A fixing plate for assembling a stationary contact is provided in the extending direction of one side wall of the receiving groove. One side of the fixing plate protrudes to form a partition, which extends between the second end of the arc-starting angle and the stationary contact.

[0016] Compared to existing circuit breakers equipped with permanent magnets, this invention, by equipping an arc-initiating coil, creates an electromagnetic field in conjunction with the arc-initiating structure after the contact mechanism breaks and generates an arc. This electromagnetic field causes the arc to rapidly transfer to the arc-extinguishing chamber, offering advantages such as low manufacturing cost and rapid arc extinguishing. Furthermore, the arc current flowing through the arc-initiating angle no longer passes through the stationary contact but instead flows through the arc-initiating coil, reducing the energizing time of the stationary contact and preventing it from bearing arc current for extended periods. This helps prevent the stationary contact from overheating and severely burning out, making it suitable for both non-polar DC circuit breakers and AC circuit breakers.

[0017] In addition, the arc-starting coil is electrically connected to the terminal block through a short-circuit protection mechanism, which is convenient for wiring. The short-circuit protection mechanism has a current-limiting function and keeps the line in a protected state, which helps to improve the effect.

[0018] In addition, the arc-starting coil has a helical structure, which is less expensive, and the magnetic field strength can be adjusted by changing the number of turns of the arc-starting coil, which is beneficial for quality control. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a circuit breaker according to the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of a circuit breaker according to the present invention (including only the base):

[0021] Figure 3 This is a schematic diagram of the structure of a circuit breaker according to the present invention (excluding the casing);

[0022] Figure 4 This is a schematic diagram of the arc-starting coil and arc-starting structure in a circuit breaker according to the present invention;

[0023] Figure 5 This is a schematic diagram of the base structure in a circuit breaker according to the present invention. Detailed Implementation

[0024] The following is in conjunction with the appendix Figures 1 to 5 The given embodiments further illustrate specific implementations of a circuit breaker according to the present invention. The circuit breaker of the present invention is not limited to the descriptions of the following embodiments.

[0025] A circuit breaker includes a pair of terminals 2, and a contact mechanism is connected between the pair of terminals 2. The contact mechanism includes a moving contact 51 and a stationary contact 52 that cooperate with each other. An arc-extinguishing chamber 7 is provided on one side of the stationary contact 52. An arc-inducing structure is provided between the arc-extinguishing chamber 7 and the contact mechanism. The arc-inducing structure includes an arc-inducing angle 81 located below the stationary contact 52. An arc-inducing coil 83 is provided on one side of the arc-inducing angle 81. The two ends of the arc-inducing coil 83 are electrically connected to a terminal 2 and the arc-inducing angle 81, respectively, forming a break point between the arc-inducing angle 81 and the stationary contact 52, so that the arc current flowing through the arc-inducing angle 81 does not pass through the stationary contact 52.

[0026] Compared to existing circuit breakers equipped with permanent magnets, this invention, by equipping an arc-initiating coil 83, forms an electromagnetic field with the arc-initiating structure after the contact mechanism breaks and generates an arc. This electromagnetic field causes the arc to rapidly transfer to the arc-extinguishing chamber 7, offering advantages such as low manufacturing cost and rapid arc extinguishing. Furthermore, the arc current flowing through the arc-initiating angle 81 no longer passes through the stationary contact 52 but instead flows through the arc-initiating coil 83, reducing the energizing time of the stationary contact 52 and preventing it from bearing arc current for extended periods. This helps prevent the stationary contact 52 from overheating and severely burning out. This invention is applicable to both non-polar DC circuit breakers and AC circuit breakers.

[0027] Combination Figure 1-5 An embodiment of a circuit breaker is provided, the circuit breaker including a housing, a pair of terminals 2 mounted at both ends of the housing, a handle mechanism 3 and an operating mechanism 4 connected in linkage between the pair of terminals 2, the connection and disconnection between the pair of terminals 2 being controlled by a contact mechanism, the contact mechanism being located in the middle of the housing, the contact mechanism including a moving contact 51 and a stationary contact 52 cooperating with each other, wherein the moving contact 51 is connected to the operating mechanism 4 and electrically connected to one of the terminals 2, the stationary contact 52 is fixed in the middle of the housing and opposite to the moving contact 51, a short-circuit protection mechanism 6 and an arc-extinguishing chamber 7 are provided on one side of the stationary contact 52, the stationary contact 52 is electrically connected to the other terminal 2 through the short-circuit protection mechanism 6, an overload protection mechanism 9 is also provided on one side of the moving contact 51, the overload protection mechanism 9 and the stationary contact 52 are respectively located on both sides of the moving contact 51, the overload protection mechanism 9 and the moving contact 51 are electrically connected to the same terminal 2.

[0028] like Figure 2 , 3 As shown, in this embodiment, the handle mechanism 3, operating mechanism 4, contact mechanism, arc-extinguishing chamber 7, short-circuit protection mechanism 6, and overload protection mechanism 9 are existing technologies. The handle mechanism 3 and operating mechanism 4 are jointly disposed on the upper part of the housing. Manual opening and closing of the circuit breaker can be achieved by operating the handle mechanism 3. The operating mechanism 4 is rotatably mounted inside the housing and includes a contact support and a latch and a trip latch rotatably mounted on the contact support. The latch and the trip latch engage, and a trip hook is connected to one end of the latch. The moving contact 51 is connected to the contact support, and the stationary contact 52 is fixed in the middle of the housing. The stationary contact 52 includes a stationary contact plate 521 and a mechanism disposed on one side of the stationary contact plate 521 that is compatible with the moving contact 51. The circuit breaker has a closed contact 522; the arc-extinguishing chamber 7 is located on one side of the stationary contact 52, and multiple arc-extinguishing grid plates for extinguishing arcs are stacked inside the arc-extinguishing chamber 7; the short-circuit protection mechanism 6 is located on one side of the operating mechanism 4 and above the arc-extinguishing chamber 7. The short-circuit protection mechanism 6 includes an instantaneous coil and a moving iron core located in the middle of the instantaneous coil. One end of the moving iron core is opposite to the operating mechanism 4. When a short-circuit fault occurs in the circuit breaker, the instantaneous coil drives the moving iron core to trigger the operating mechanism 4 to trip; the overload protection mechanism 9 includes a bimetallic strip. One end of the bimetallic strip is fixed inside the housing, and the other end is opposite to the trip hook. When an overload occurs in the circuit breaker, the bimetallic strip is heated and bent, triggering the trip hook to trip the operating mechanism 4.

[0029] An arc-initiating structure is provided between the contact mechanism and the arc-extinguishing chamber 7. The arc-initiating structure includes an arc-initiating angle 81 and an arc-initiating plate 82. The arc-initiating angle 81 is located below the stationary contact 52, and the arc-initiating plate 82 is located opposite the moving contact 51 and extends into the arc-extinguishing chamber 7. The arc-initiating plate 82 and the arc-initiating angle 81 form an arc-initiating channel 80 between the contact mechanism and the arc-extinguishing chamber 7. One end of the arc-initiating channel 80 serves as the channel inlet opposite the contact mechanism, and the other end serves as the channel outlet opposite the arc-extinguishing chamber 7. In this embodiment, the first ends of the arc-initiating angle 81 and the arc-initiating plate 82 extend opposite each other into both sides of the arc-extinguishing chamber 7. Figure 3-5 As shown, the first end of the arc-starting angle 81 extends to the upper side of the arc-extinguishing chamber 7, the first end of the arc-starting plate 82 extends to the lower side of the arc-extinguishing chamber 7, and the second end of the arc-starting angle 81 extends below the stationary contact 52 but does not contact the stationary contact 52. That is, a certain distance gap 'a' is reserved between the second end of the arc-starting angle 81 and the stationary contact 52 (see...). Figure 4 The second end of the arc-starting angle 81 is made to break with the stationary contact 52. Preferably, an insulating partition is provided in the gap a between the second end of the arc-starting angle 81 and the stationary contact 52. The arc-starting angle 81 is electrically connected to the short-circuit protection mechanism 6 through the arc-starting coil 83. The stationary contact 52 is electrically connected to the short-circuit protection mechanism 6. The second end of the arc-starting plate 82 and the moving contact 51 are respectively electrically connected to the same terminal 2. In this embodiment, the arc-starting plate 82 is electrically connected to the terminal 2 through the overload protection mechanism 9.

[0030] An arc-starting coil 83 is provided on one side of the arc-starting angle 81. The two ends of the arc-starting coil 83 are electrically connected to a terminal 2 and the arc-starting angle 81, respectively. In a preferred embodiment, the arc-starting coil 83 is located between the short-circuit protection mechanism 6, the arc-starting angle 81, the stationary contact 52, and the arc-extinguishing chamber 7. In this case, the arc-starting coil 83 is located outside the arc-starting channel 80. One end of the arc-starting coil 83 is electrically connected to a terminal 2 through the short-circuit protection mechanism 6, and the other end is electrically connected to the second end of the arc-starting angle 81. Preferably, the arc-starting coil 83 is a helical structure. The helical structure can be made of materials such as a helical spring or a helical enameled coil. In this example, the arc-starting coil 83 is preferably a right-hand helical enameled coil. The central axis of the right-hand helical enameled coil is perpendicular to the central axis of the instantaneous coil of the short-circuit protection mechanism 6. Figure 4In this configuration, the lower end of the arc-starting coil 83 is electrically connected to the arc-starting angle 81. The arc-starting coil 83, in conjunction with the arc-starting structure, generates an electromagnetic field for arc ignition, causing the arc to rapidly move into the arc-extinguishing chamber 7 under the influence of this field. Alternatively, the arc-starting coil 83 can be a left-handed coil; in this case, the upper end of the arc-starting coil 83 needs to be connected to the arc-starting angle 81 (not shown). When the contact mechanism breaks, an arc is generated between the moving contact 51 and the stationary contact 52. The moving contact 51, the stationary contact 52, and the contact point between the moving contact 51 and the stationary contact 52 form a U-shaped current conductor. Under the influence of the self-excited magnetic field of the U-shaped conductor, the arc moves downwards along the arc-starting channel 80. Figure 1 , 3 The electric arc moves downwards along the arc-ignition channel 80 to between the arc-ignition angle 81 and the arc-ignition plate 82. When the arc reaches between the arc-ignition angle 81 and the arc-ignition plate 82, the break between the arc-ignition angle 81 and the stationary contact 52 causes the arc current to flow through the arc-ignition angle 81 and then through the arc-ignition coil 83, and no longer through the stationary contact 52. The arc-ignition coil 83, the short-circuit protection mechanism 6, the arc-ignition angle 81, the arc-ignition plate 82, and a pair of terminals 2 form a circuit for interrupting the arc. At this time, the arc-ignition coil 83 generates an electromagnetic field for arc ignition, causing the arc within the electromagnetic field to be rapidly moved into the arc-extinguishing chamber 7 by the Lorentz force. During the process, the arc current flowing through the arc-starting angle 81 no longer passes through the stationary contact 52, thereby preventing the arc current from being diverted to the stationary contact 52. This allows the arc-starting coil 83 to obtain a sufficient amount of arc current to generate a strong electromagnetic field, which accelerates the movement of the arc towards the arc-extinguishing chamber 7. In addition, the break point increases the impedance of the entire current loop, which plays a current-limiting role. Moreover, regardless of which terminal 2 the power supply is connected from, the electromagnetic polarity generated by the arc-starting coil 83 will change accordingly with the current flow direction, realizing the non-polarity connection function. This structure is suitable for non-polarity DC circuit breakers and AC circuit breakers.

[0031] Another embodiment is provided: when the circuit breaker does not have a short-circuit protection mechanism 6, the two ends of the arc-starting coil 83 are directly electrically connected to a terminal 2 and an arc-starting angle 81. Its working principle is the same as the above embodiment, and it can still prevent the stationary contact 52 from overheating and burning out due to long-term energization. Of course, when the circuit breaker has a short-circuit protection mechanism 6, the two ends of the arc-starting coil 83 can still be directly electrically connected to a terminal 2 and an arc-starting angle 81. However, without the short-circuit protection mechanism 6, the following defects will occur: first, the distance between the arc-starting coil 83 and the terminal 2 is relatively far, making wiring inconvenient; second, the lack of protection from the short-circuit protection mechanism 6 may cause the moving contact 51 to open more slowly, and the short-circuit protection mechanism 6 cannot provide current limiting, reducing the protection effect.

[0032] Preferred, such as Figure 2As shown, a receiving groove 14 for assembling an arc-starting coil 83 is provided in the middle of the outer shell. A fixing part 15 for connecting and fixing the arc-starting coil 83 is provided in the middle of the receiving groove 14. The outer shell is composed of an upper cover and a base 1 that cover each other. The receiving groove 14 can be set on the upper cover or the base 1 alone, or it can be set on both the upper cover and the base 1 to form a partial receiving groove 14. The complete receiving groove 14 is formed by docking.

[0033] like Figure 2 , 5 As shown, in this embodiment, the receiving groove 14 is separately disposed on the base 1. The base 1 has a first mounting groove 11 and a second mounting groove 12 respectively in the middle part. The first mounting groove 11 is located above the second mounting groove 12. A short circuit protection mechanism 6 is installed in the first mounting groove 11, and an arc extinguishing chamber 7 is installed in the second mounting groove 12. A partition 13 is also provided in the middle of the base 1. The partition 13 includes a straight section and a curved section. The straight section extends between the first mounting groove 11 and the second mounting groove 12. The curved section is located on the same side of the first mounting groove 11 and the second mounting groove 12 and forms an open-top U-shaped groove on the base 1. The U-shaped groove serves as a receiving groove 14. A protruding columnar protrusion is provided on the base 1. The columnar protrusion is located in the middle of the receiving groove 14 and serves as a fixing part 15. The receiving groove 14 formed by the curved section has two side walls of different lengths. The side wall away from the arc-extinguishing chamber 7 is shorter and has a fixing plate 16 for assembling the stationary contact 52 in its extending direction. A gap is reserved between the fixing plate 16 and the end of the curved section for the arc-initiating coil 83 to pass through. Preferably, a partition is provided on one side of the fixing plate 16. The partition is used to extend into the gap a between the second end of the arc-initiating angle 81 and the stationary contact 52. Figure 5 The central fixing plate 16 takes an L-shape after being equipped with a partition.

[0034] like Figure 2-4As shown, in this embodiment, the arc-starting angle 81 is arranged along the partition 13, that is, the first end of the arc-starting angle 81 extends along the straight section of the partition 13 into the arc-extinguishing chamber 7, and the second end of the arc-starting angle 81 is arranged along the curved section of the partition 13, that is, the second end of the arc-starting angle 81 is curved along the outer side of the side wall of the receiving groove 14. The length of the second end of the arc-starting angle 81 is greater than the length of the curved section. At this time, the second end of the arc-starting angle 81 extends to one side of the partition and abuts against the partition. One end of the arc-starting coil 83 passes through the gap between the curved section and the fixing plate 16 and exits the receiving groove 14 to connect with the second end of the arc-starting angle 81. Of course, the receiving groove 14 It can also be a U-shaped groove that is symmetrical from left to right. One end of the arc-starting coil 83 can pass over the side wall of the receiving groove 14 or pass through the perforation set in the side wall of the receiving groove 14 and can also be connected to the second end of the arc-starting angle 81. The stationary contact plate 521 of the stationary contact 52 is fixedly set on the fixed plate 16. One side of the stationary contact plate 521 is provided with a contact point 522 that cooperates with the moving contact 51. The upper side of the stationary contact plate 521 is bent towards the short-circuit protection mechanism 6 and connected to the short-circuit protection mechanism 6. The lower side of the stationary contact plate 521 abuts against the other side of the partition. At this time, the partition makes the stationary contact 52 and the second end of the arc-starting angle 81 form a break.

[0035] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A circuit breaker, comprising a housing, a pair of terminals (2), a contact mechanism connected between the pair of terminals (2), the contact mechanism comprising a moving contact (51) and a stationary contact (52) cooperating with each other, an arc-extinguishing chamber (7) provided on one side of the stationary contact (52), an arc-inducing structure provided between the arc-extinguishing chamber (7) and the contact mechanism, the arc-inducing structure comprising an arc-inducing angle (81) located below the stationary contact (52), and an arc-inducing plate (82) provided below the moving contact (51), the arc-inducing plate (82) and the arc-inducing angle (81) forming an arc-inducing channel (80) between the contact mechanism and the arc-extinguishing chamber (7), the first ends of the arc-inducing angle (81) and the arc-inducing plate (82) extending into the two sides of the arc-extinguishing chamber (7), characterized in that: An arc-starting coil (83) is provided on one side of the arc-starting angle (81). The two ends of the arc-starting coil (83) are electrically connected to a terminal (2) and the arc-starting angle (81) respectively. A gap (a) is reserved between the arc-starting angle (81) and the stationary contact (52) to form a break point, so that the arc current flowing through the arc-starting angle (81) does not pass through the stationary contact (52). The first end of the arc-starting angle (81) extends to the upper side inside the arc-extinguishing chamber (7), the first end of the arc-starting plate (82) extends to the lower side of the arc-extinguishing chamber (7), and the second end of the arc-starting angle (81) is electrically connected to the terminal (2) through the arc-starting coil (83) and the short-circuit protection mechanism (6). The outer casing includes a base (1) and a top cover that overlap each other, and a receiving groove (14) is provided in the middle of the base (1) and / or the top cover, and a fixing part (15) for assembling an arc-starting coil (83) is provided in the middle of the receiving groove (14). The receiving groove (14) is a U-shaped groove with an opening facing the short-circuit protection mechanism (6), allowing one end of the arc-starting coil (83) to pass through the opening and connect to the short-circuit protection mechanism (6). The second end of the arc-starting angle (81) is bent along the outer side of the side wall of the receiving groove (14), and the other end of the arc-starting coil (83) passes through the side wall of the receiving groove (14) and connects to the second end of the arc-starting angle (81). A fixing plate (16) for assembling a stationary contact (52) is provided on the extending direction of one side wall of the receiving groove (14). One side of the fixing plate (16) protrudes to form a partition. The fixing plate (16) has a partition. The whole structure is L-shaped. The second end of the dividing part extends into the gap (a) between the second end of the arc-drawing angle (81) and the stationary contact (52). The second end of the arc-drawing angle (81) extends to one side of the dividing part and abuts against the dividing part. The stationary contact (52) includes a stationary contact plate (521). The stationary contact plate (521) is fixedly mounted on the fixed plate (16). The stationary contact plate (521) is provided with a contact point (522) that cooperates with the moving contact (51). The upper side of the stationary contact plate (521) bends towards the short-circuit protection mechanism (6) and connects with the short-circuit protection mechanism (6). The lower side of the stationary contact plate (521) abuts against the other side of the dividing part.

2. A circuit breaker according to claim 1, characterized in that: The arc-initiating structure also includes an arc-initiating plate (82), which is arranged opposite to the arc-initiating angle (81) to form an arc-initiating channel (80) between the contact mechanism and the arc-extinguishing chamber (7). The arc-initiating coil (83) is located outside the arc-initiating channel (80) on one side of the arc-initiating angle (81). The first end of the arc-initiating plate (82) extends into the arc-extinguishing chamber (7), and the second end of the arc-initiating plate (82) is electrically connected to another terminal (2).

3. A circuit breaker according to claim 2, characterized in that: It also includes an overload protection mechanism (9), which is respectively disposed on both sides of the moving contact (51) and the stationary contact (52). The arc-starting plate (82), the moving contact (51) and the overload protection mechanism (9) are electrically connected to the same terminal (2).

4. A circuit breaker according to claim 1, characterized in that: The arc-inducing coil (83) has a spiral structure. The central axis of the arc-inducing coil (83) is perpendicular to the central axis of the instantaneous coil of the short-circuit protection mechanism (6). One end of the arc-inducing coil (83) is electrically connected to the instantaneous coil, and the other end of the arc-inducing coil (83) is electrically connected to the arc-inducing angle (81).

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