Magnetic trip coil, magnetic trip unit, circuit breaker, switching device

Abstract

The coil of the magnetic release includes at least one conductive ring, and the conductive ring includes a connecting plate and two connecting ends respectively connected to both sides of the connecting plate and arranged in parallel and relatively spaced apart, with a gap between the two connecting ends. When one conductive ring is provided, the gap of the conductive ring is a receiving cavity; when multiple conductive rings are provided, the conductive rings are arranged in an interval arrangement, and the connecting ends on the same side of the conductive rings are arranged in a straight line, and the gaps of the conductive rings are connected to form a receiving cavity, wherein the connecting ends on different sides of two adjacent conductive rings are electrically connected. The coil of the magnetic release of the utility model and the magnetic release using the coil design the coil into one or more U-shaped conductive rings. Since the U-shaped conductive ring has two parallel connecting ends, it can be arranged as close to the top and bottom plates of the circuit breaker housing as possible. Therefore, the circuit breaker or switch electrical appliance using the magnetic release can use low-conductivity materials without changing the rated current, thereby reducing costs or achieving a higher rated current.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, in particular to a coil of a magnetic release, a magnetic release, a circuit breaker and a switch electrical appliance. Background Art

[0002] At present, due to the limited internal space of small circuit breakers on the market, the coils of the conductive system, such as magnetic releases, are made of copper materials with good conductivity. However, copper materials are expensive and have high production costs, which reduces market competitiveness. At the same time, the coil needs to meet the rated current requirements of the small circuit breaker. If other materials with low prices but low conductivity are used, the size of the coil must be increased. However, due to the internal space limitations of small circuit breakers, the space that the coil can occupy is limited, making it difficult to achieve the purpose of reducing costs by replacing copper materials with cheap materials. Moreover, if the coil made of copper material wants to achieve a higher rated current, it will inevitably increase the size of the coil. Summary of the invention

[0003] The utility model aims to overcome at least one defect of the prior art and provides a coil of a magnetic release, a magnetic release, a circuit breaker and a switch electrical appliance.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The coil of the magnetic release comprises at least one conductive ring, wherein the conductive ring comprises a connecting plate and two connecting ends respectively connected to both sides of the connecting plate and arranged in parallel and at a relative interval, wherein a gap is provided between the two connecting ends, and when one conductive ring is provided, the gap of the conductive ring is an accommodating cavity; when a plurality of conductive rings are provided, the conductive rings are arranged in an interval arrangement, the connecting ends on the same side of the conductive rings are arranged in a straight line, the gaps of the conductive rings are connected to form an accommodating cavity, wherein the connecting ends on different sides of two adjacent conductive rings are electrically connected.

[0006] Optionally, the connection ends on different sides of two adjacent conductive rings are electrically connected via a conductive plate, and the conductive plate is disposed at an open portion of the notch of the conductive ring.

[0007] Optionally, one connecting end of the conductive ring is vertically connected to the conductive plate, and the conductive plate is provided with a clearance space opposite to the other connecting end of the conductive ring.

[0008] Optionally, the connecting end of the conductive ring is connected to the conductive plate by snap-fit ​​contact.

[0009] Optionally, the connecting end of the conductive ring is clamped with the conductive plate via a concave-convex structure, and one or more concave-convex structures are provided. The concave-convex structure includes a clamping protrusion provided on the two connecting ends of the conductive ring and a clamping groove provided on the conductive plate and cooperating with the clamping protrusion, and the clamping groove is a groove that does not penetrate the conductive plate or a through groove that penetrates the conductive plate.

[0010] Optionally, the conductive plate is a straight structure, wherein the length direction is the arrangement direction of the conductive rings, the width direction is the setting direction of the two connecting ends of the conductive rings, and the thickness direction is the connection direction between the connecting ends and the conductive plate.

[0011] Optionally, the conductive ring is an integrally formed structure formed by bending a sheet-shaped conductor, and the width of the sheet-shaped conductor is equal to the width of the conductive ring.

[0012] Optionally, the conductive ring is a U-shaped structure.

[0013] Optionally, the conductive ring is an aluminum conductive ring, an iron conductive ring, or a copper conductive ring; and / or, the conductive plate is an aluminum conductive plate, an iron conductive plate, or a copper conductive plate.

[0014] A magnetic release, comprising any one of the coils described above.

[0015] Optionally, the magnetic release includes a sleeve arranged in the accommodating cavity of the coil, a moving iron core and a stationary iron core relatively arranged in the sleeve, a tripping rod connected to the moving iron core, and a reset spring connected between the moving iron core and the stationary iron core and used to drive the moving iron core to reset.

[0016] A switching device, comprising any one of the magnetic releases described above.

[0017] A circuit breaker comprises any one of the magnetic releases, a matching moving contact and static contact, an operating mechanism, and two wiring seats, wherein one wiring seat is electrically connected to the moving contact, and the other wiring seat is electrically connected to the static contact through a coil, and when the coil is provided with a conductive ring, the two connecting ends of the conductive ring are electrically connected to the static contact and the other wiring seat respectively; when the coil is provided with a plurality of conductive rings, the other connecting end of the outermost conductive ring of the coil of the magnetic release is electrically connected to the static contact, and the other connecting end of the outermost conductive ring is electrically connected to the other wiring seat; and the operating mechanism drives the moving contact and the static contact to close or open.

[0018] Optionally, the coil of the magnetic release includes two conductive rings and a conductive plate.

[0019] Optionally, the circuit breaker is a miniature circuit breaker with a convex-shaped shell and a thickness of 18 mm, and the conductive cross-sectional area of ​​the coil is 25 mm. 2 .

[0020] The coil of the magnetic release and the magnetic release using the coil of the utility model are designed to be one or more U-shaped conductive rings. Since the U-shaped conductive ring has two parallel connection ends, it can be arranged as close to the top and bottom plates of the circuit breaker housing as possible, thereby increasing the space occupied by the coil in the height direction of the circuit breaker to shorten the size of the coil in the arrangement direction of the conductive rings. Therefore, the circuit breaker or switch electrical appliance using the magnetic release can use low-conductivity materials under the condition of unchanged rated current, thereby reducing costs or achieving higher rated current.

[0021] In addition, the connecting end of the conductive ring and the conductive plate are stacked up and down to make the structure of the coil more compact and reduce the size of the coil. The setting of the clearance space makes the structure of the coil connected in series to the main circuit more compact, thereby reducing the occupied space in the horizontal direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the circuit breaker of the utility model;

[0023] Figure 2 It is a schematic diagram of the structure of the wiring board, the coil and the static contact of the first embodiment of the utility model;

[0024] Figure 3 It is a three-dimensional diagram of a coil of Embodiment 1 of the utility model;

[0025] Figure 4 It is an exploded view of the coil of the first embodiment of the utility model;

[0026] Figure 5 It is a three-dimensional diagram of the magnetic release of the utility model;

[0027] Figure 6 It is an exploded view of the magnetic release of the utility model;

[0028] Figure 7 It is a comparison diagram between the coil of the utility model and the existing coil;

[0029] Figure 8 It is an exploded view of the wiring board, the coil and the static contact of the second embodiment of the utility model;

[0030] Fig. 9 It is an assembly diagram of the utility model wiring board, the coil of the second embodiment and the static contact;

[0031] Fig.10 It is a schematic diagram of the wiring board, the coil and the static contact of the third embodiment of the utility model.

[0032] Magnetic release 1; coil 11; conductive ring 111; notch 111a; connecting end 111b; snap-on protrusion 111c; connecting plate 111d; conductive plate 113; clearance space 113a; snap-on slot 113b; sleeve 12; moving iron core 13; static iron core 14; tripping rod 15; reset spring 16; housing 2; moving contact 3; static contact 4; operating mechanism 5; handle 51; connecting rod 52; lever 53; tripping buckle 54; locking buckle 55; contact support 56; terminal block 6; terminal frame 61; terminal screw 62; terminal board 63; double metal 7; arc extinguishing chamber 8. DETAILED DESCRIPTION

[0033] The following embodiments are given in conjunction with the accompanying drawings to further illustrate the specific implementation of the coil of the magnetic release, the magnetic release, the circuit breaker and the switch electrical appliance of the utility model. The coil of the magnetic release and the circuit breaker of the utility model are not limited to the description of the following embodiments.

[0034] like Figure 1 As shown, the circuit breaker of this embodiment includes a housing 2, a magnetic release 1, a matching moving contact 3 and a stationary contact 4, an operating mechanism 5, and two terminal blocks 6 for external wiring, one terminal block 6 is electrically connected to the moving contact 3, and the other terminal block 6 is electrically connected to the stationary contact 4 to form the main circuit of the circuit breaker. The operating mechanism 5 drives the moving contact 3 and the stationary contact 4 to close or disconnect, so as to conduct or disconnect the main circuit of the circuit breaker to achieve the closing or opening of the circuit breaker. The magnetic release 1 is connected in series to the main circuit of the circuit breaker for short-circuit protection. The circuit breaker may also include a double metal 7 connected in series to the main circuit of the circuit breaker and used for overload protection, the double metal 7 is connected between the moving contact 3 and the terminal block 6; the circuit breaker also includes an arc extinguishing chamber 8, the arc extinguishing chamber 8 is arranged relative to the contact position of the moving contact 3 and the stationary contact 4, and is used to extinguish the arc generated during the opening and closing process of the moving contact 3 and the stationary contact 4.

[0035] It should be noted that the operating mechanism 5 is a prior art, and generally includes a handle 51, a connecting rod 52, a lever 53, a jumper 54, a lock 55, and a contact support 56. The handle 51 is connected to the lever 53 by transmission through the connecting rod 52, the jumper 54 and the lock 55 are snap-connected and pivotally mounted on the lever 53, respectively, the contact support 56 is pivotally mounted on the lever 53, and the moving contact 3 is mounted on the contact support 56. The operating principle of the operating mechanism 5 is a prior art, and will not be described in detail here. The utility model can adopt not only the operating mechanism of this embodiment, but also operating mechanisms of other structures. The terminal block 6 is a prior art, comprising a terminal frame 61 having a wiring space, a terminal screw 62 screwed on the terminal frame 61, and a terminal board 63 used for external wiring in cooperation with the terminal screw 62. The external connection end of the terminal board 63 is placed in the wiring space and arranged opposite to the terminal screw 62. The housing 2 of the circuit breaker is provided with a wiring port corresponding to the wiring space. The external wire extends into the wiring space from the wiring port. By tightening the terminal screw 62, the external wire is pressed against the terminal board 63 and reliably connected to the terminal board 63.

[0036] like Figure 2-Figure 5 As shown, the magnetic release 1 of this embodiment includes a coil 11, and the coil 11 includes at least one conductive ring 111. The conductive ring 111 includes a connecting plate 111d and two connecting ends 111b respectively connected to both sides of the connecting plate 111d and arranged in parallel and relatively spaced apart, and a gap 111a is provided between the two connecting ends 111b.

[0037] When the coil 11 is provided with a conductive ring 111, the notch 111a of the conductive ring 111 is a receiving cavity. Specifically, the two connecting ends 111b of the conductive ring 111 are electrically connected to the static contact 4 and the terminal block 63 of the other terminal block 6 respectively, so that the coil 11 is connected in series to the main circuit of the circuit breaker.

[0038] When the coil 11 is provided with a plurality of conductive rings 111, the conductive rings 111 are arranged in an alternate arrangement, the connecting ends 111b on the same side of the conductive rings 111 are arranged in a straight line, and the notches 111a of the conductive rings 111 are connected to form an accommodating cavity, wherein the connecting ends 111b on different sides of two adjacent conductive rings 111 are electrically connected via a conductive plate 113, that is, the two connecting ends 111b of the middle conductive ring 111 are respectively connected to the two adjacent conductive rings 111 via two conductive plates 113, one connecting end 111b of the outermost conductive ring 111 is connected to the next outermost conductive ring 111 via the conductive plate 113, and the other connecting end 111b of the outermost conductive ring 111 is used to be connected to other parts of the circuit breaker, so that the coil 11 is connected in series to the main circuit of the circuit breaker. Specifically, the static contact 4 is electrically connected to the terminal holder 6 through the coil 11, the other connection end 111b of the outermost conductive ring 111 of the coil 11 is electrically connected to the static contact 4, and the other connection end 111b of the other outermost conductive ring 111 is electrically connected to the terminal board 63 of the other terminal holder 6.

[0039] like Figure 7 As shown in FIG. 1 , a comparison diagram of a two-turn coil of the present embodiment and a two-turn solenoid coil of the prior art is shown. Both coils are wound with a sheet conductor of the same width. The solenoid coil has a winding angle greater than 0, and the conductive ring 111 of the coil of the present embodiment has no offset in the arrangement direction of the conductive ring 111, that is, the winding angle is 0, and then the conductive ring 111 is connected by a conductive plate 113, so that in the same conductive cross-sectional area (for example, 25mm 2 ) and the same number of turns (e.g., two turns), the coil of this embodiment is smaller in the arrangement direction of the conductive ring 111. The conventional solenoid coil has a spiral design that causes Figure 1 The horizontal dimension of the 20mm is too large, which will interfere with other structures and cannot be placed in the housing 2. Without changing the number of turns, only the conventional 10mm 2 Solenoid coil; reducing the number of turns from two turns to one turn without changing the conductive cross-sectional area can also reduce the coil size, but the magnetic field of the coil will be weakened and the performance will be reduced by half.

[0040] The coil and circuit breaker of the magnetic release of the present embodiment are designed such that the coil 11 is formed into one or more U-shaped conductive rings 111. Since the U-shaped conductive rings 111 have two parallel connection ends 111b, they can be arranged as close to the top and bottom plates of the circuit breaker housing 2 as possible, thereby increasing the space occupied by the coil 11 in the height direction of the circuit breaker, thereby shortening the length of the coil 11 in the arrangement direction of the conductive rings 111 ( Figure 1Therefore, when the rated current of the circuit breaker remains unchanged, a material with low conductivity (such as aluminum, iron or other materials with relatively low conductivity) can be used, that is, the conductive ring 111 is an aluminum conductive ring, an iron conductive ring or a copper conductive ring; and / or, the conductive plate 113 is an aluminum conductive plate, an iron conductive plate or a copper conductive plate, and the 25mm of aluminum and iron 2 The effect of the coil 11 of this embodiment is equivalent to that of a 10 mm copper 2 The solenoid coil reduces the cost. That is, in this embodiment, in a miniature circuit breaker with a housing 2 having a convex structure and a thickness of 18 mm, the conductive cross-sectional area of ​​the coil 11 can be 25 mm. 2 or achieve a higher rated current without changing the size limit of the circuit breaker, i.e. 25mm copper 2 The rated current of the coil 11 of this embodiment is greater than the 10mm copper 2 The rated current of the solenoid coil. Obviously, the coil 11 of this embodiment is not limited to a miniature circuit breaker, nor is it limited to a 25mm 2 or 10mm 2 Conductive cross section.

[0041] like Figure 2-Figure 4 As shown, the layout structure of the coil 11 in this embodiment, the conductive plate 113 is arranged at the open part of the notch 111a of the conductive ring 111, one connecting end 111b of the conductive ring 111 is vertically connected to the conductive plate 113, and the conductive plate 113 is provided with a clearance space 113a opposite to the other connecting end 111b of the conductive ring 111. The connecting end 111b of the conductive ring 111 and the conductive plate 113 are stacked up and down, so that the structure of the coil 11 is more compact and the size of the coil 11 is reduced. The provision of the clearance space 113a makes the structure of the coil 11 connected in series to the main circuit more compact, so as to reduce the occupied space in the horizontal direction. Of course, as other embodiments, the conductive plate 113 is arranged in the notch 111a and connected to the inner side of the connecting end 111b.

[0042] Specifically, one end of the static contact 4 is placed in the clearance space 113a, and is perpendicular to the arrangement direction of the conductive rings 111 in the direction perpendicular to the other connecting end 111b of the outermost conductive ring 111 ( Figure 1 One end of the wiring board 63 of the wiring seat 6 is placed in the clearance space 113a, and is stacked with the other connecting end 111b of the other outermost conductive ring 111 in the vertical direction of the arrangement direction of the conductive ring 111. The layout is compact and reasonable, and the occupied space of the coil 11 is effectively reduced.

[0043] In the present embodiment, the connection structure between the conductive ring 111 and the conductive plate 113, the static contact 4, and the terminal board 63 is that the connection end 111b of the conductive ring 111 is connected to the conductive plate 113, the static contact 4, and the terminal board 63 through a concave-convex structure, and the connection end 111b of the conductive ring 111 is also welded to the conductive plate 113, the static contact 4, and the terminal board 63, so that the connection is more secure. Specifically, one or more concave-convex structures are provided, and the concave-convex structures include a clamping protrusion 111c provided on the two connection ends 111b of the conductive ring 111 and a clamping groove 113b provided on the conductive plate 113, the static contact 4, and the terminal board 63 and matched with the clamping protrusion 111c, and the clamping groove 113b is a groove that does not penetrate the conductive plate 113 or a through groove that penetrates the conductive plate 113. The clamping protrusion 111c and the clamping groove 113b are preferably square, and of course they can also be other shapes such as triangles. The connection end 111 b of the conductive ring 111 and the conductive plate 113 , the stationary contact 4 , and the terminal block 63 may be fixed by riveting or other methods, or may be integrally formed.

[0044] The difference between the coil 11 structures in the first to third embodiments of the present invention is only the number of concave and convex structures. Figure 2-Figure 4 The coil 11 of the first embodiment shown in the figure does not have a concave-convex structure. The connecting end 111b of the conductive ring 111 is directly welded and fixed to the conductive plate 113, the static contact 4, and the terminal block 63. The connecting end 111b of the conductive ring 111 is provided with a protrusion for welding loss. Figure 8-Figure 9 The coil 11 of the second embodiment shown in the figure has two concave-convex structures, and the slot 113b is a through slot that penetrates the conductive plate 113; Fig.10 In the coil 11 of the third embodiment shown, one concave-convex structure is provided in this embodiment, and the slot 113 b is a through slot penetrating the conductive plate 113 .

[0045] like Figure 3 and Figure 4 As shown in the figure, the structure of the conductive plate 113 in this embodiment is a straight structure, the length direction of which is the arrangement direction of the conductive rings 111, the width direction of which is the arrangement direction of the two connecting ends 111b of the conductive rings 111, and the thickness direction of which is the connection direction of the connecting ends 111b and the conductive plate 113. The structure of the conductive plate 113 is extremely simple, which simplifies the production process and facilitates production.

[0046] like Figure 4As shown, the structure of the conductive ring 111 in this embodiment is an integrally formed structure. In this embodiment, the conductive ring 111 is formed by bending a sheet-like conductor, and the two connecting ends 111b of the conductive ring 111 are arranged oppositely. The conductive ring 111 has no offset in the arrangement direction of the conductive ring 111, that is, the width of the sheet-like conductor is equal to the width of the conductive ring 111. Preferably, the conductive ring 111 is a U-shaped structure, that is, the connecting plate 111d is a flat plate structure, and the connection between its two sides and the two connecting ends 111b is rounded. Of course, the connecting plate 111d can also be a flat plate structure without rounded corners, or a curved structure such as an arc or V-shape, or other structures.

[0047] like Figure 2 As shown, in a specific embodiment, the coil 11 includes two conductive rings 111 and a conductive plate 113, and one connecting end 111b of the two conductive rings 111 is connected through the conductive plate 113, the other connecting end 111b of one conductive ring 111 is electrically connected to the static contact 4, and the other connecting end 111b of the other conductive ring 111 is electrically connected to the terminal block 63. Of course, the coil 11 can also be provided with more conductive rings 111 and one less conductive plate 113 than the number of conductive rings 111.

[0048] like Figure 5 and Figure 6 As shown, the specific structure of the magnetic release 1 in this embodiment, the magnetic release 1 includes a sleeve 12 arranged in the accommodating cavity of the coil 11, a moving iron core 13 and a static iron core 14 relatively arranged in the sleeve 12, a tripping rod 15 connected to the moving iron core 13, and a reset spring 16 connected between the moving iron core 13 and the static iron core 14 and used to drive the moving iron core 13 to reset. When a short circuit fault occurs in the circuit breaker, the magnetic field generated by the coil 11 causes the moving iron core 13 to overcome the elastic force of the reset spring 16 and to attract the static iron core 14, and the moving iron core 13 drives the tripping rod 15, so that the tripping rod 15 extends out of the sleeve 12 and hits the lock 55 of the operating mechanism 5, so that the lock 55 and the jumper 54 are released, and then the moving contact 3 and the static contact 4 are driven to disconnect to realize the short circuit protection of the circuit breaker; after the coil 11 is powered off, the moving iron core 13 is reset under the elastic force of the reset spring 16. It should be noted that the action principle of the magnetic release 1 is the existing technology, which will not be repeated here.

[0049] Obviously, the magnetic release using the coil of this embodiment can be used not only in circuit breakers but also in other switching electrical appliances.

[0050] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on directions or positional relationships shown in the drawings, or directions or positional relationships that are usually placed when in use, and are only for the convenience of description, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions, and cannot be understood as indicating relative importance.

[0051] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. The coil of the magnetic release is characterized by: The invention comprises at least one conductive ring (111), wherein the conductive ring (111) comprises a connecting plate (111d) and two connecting ends (111b) respectively connected to two sides of the connecting plate (111d) and arranged in parallel and relatively spaced apart, wherein a gap (111a) is provided between the two connecting ends (111b), and when one conductive ring (111) is provided, the gap (111a) of the conductive ring (111) is an accommodating cavity; when a plurality of conductive rings (111) are provided, the conductive rings (111) are arranged in an arranged manner at intervals, the connecting ends (111b) on the same side of the conductive rings (111) are arranged in a straight line, and the gaps (111a) of the conductive rings (111) are connected to form an accommodating cavity, wherein the connecting ends (111b) on different sides of two adjacent conductive rings (111) are electrically connected.

2. The coil of the magnetic release according to claim 1, characterized in that: The connection ends (111b) on different sides of two adjacent conductive rings (111) are electrically connected via a conductive plate (113), and the conductive plate (113) is arranged at the open end of the notch (111a) of the conductive ring (111).

3. The coil of the magnetic release according to claim 2, characterized in that: One connection end (111b) of the conductive ring (111) is vertically connected to a conductive plate (113), and the conductive plate (113) is provided with a clearance space (113a) opposite to the other connection end (111b) of the conductive ring (111).

4. The coil of the magnetic release according to claim 2, characterized in that: The connection end (111b) of the conductive ring (111) is connected to the conductive plate (113) by snap-fitting contact.

5. The coil of the magnetic release according to claim 4, characterized in that: The connecting end (111b) of the conductive ring (111) is clamped with the conductive plate (113) via a concave-convex structure, one or more of which are provided, and the concave-convex structure comprises a clamping protrusion (111c) provided on the two connecting ends (111b) of the conductive ring (111) and a clamping groove (113b) provided on the conductive plate (113) and cooperating with the clamping protrusion (111c), wherein the clamping groove (113b) is a groove that does not penetrate the conductive plate (113) or a through groove that penetrates the conductive plate (113).

6. The coil of the magnetic release according to claim 3, characterized in that: The conductive plate (113) is a straight structure, its length direction is the arrangement direction of the conductive ring (111), its width direction is the arrangement direction of the two connecting ends (111b) of the conductive ring (111), and its thickness direction is the connection direction between the connecting ends (111b) and the conductive plate (113).

7. The coil of the magnetic release according to claim 1, characterized in that: The conductive ring (111) is an integrally formed structure formed by bending a sheet-shaped conductor, and the width of the sheet-shaped conductor is equal to the width of the conductive ring (111).

8. The coil of the magnetic release according to claim 1, characterized in that: The conductive ring (111) is a U-shaped structure.

9. The coil of the magnetic release according to claim 2, characterized in that: The conductive ring (111) is an aluminum conductive ring, an iron conductive ring, or a copper conductive ring; and / or the conductive plate (113) is an aluminum conductive plate, an iron conductive plate, or a copper conductive plate.

10. Magnetic release, characterized in that: The magnetic release (1) comprises the coil (11) according to any one of claims 1 to 9.

11. The magnetic release according to claim 10, characterized in that: The magnetic release comprises a sleeve (12) arranged in a receiving cavity of a coil (11), a moving iron core (13) and a stationary iron core (14) arranged relatively in the sleeve (12), a release rod (15) connected to the moving iron core (13), and a reset spring (16) connected between the moving iron core (13) and the stationary iron core (14) and used for driving the moving iron core (13) to reset.

12. A switch, characterized in that: It comprises the magnetic release (1) as claimed in claim 10 or 11.

13. A circuit breaker, characterized in that: The invention comprises a magnetic release (1) as claimed in claim 10 or 11, a matching moving contact (3) and a stationary contact (4), an operating mechanism (5), and two terminal blocks (6), wherein one terminal block (6) is electrically connected to the moving contact (3), and the other terminal block (6) is electrically connected to the stationary contact (4) through a coil (11); when the coil (11) is provided with a conductive ring (111), the two connecting ends (111b) of the conductive ring (111) are electrically connected to the stationary contact (4) and the other terminal block (6) respectively; when the coil is provided with a plurality of conductive rings (111), the other connecting end (111b) of the outermost conductive ring (111) of the coil (11) of the magnetic release (1) is electrically connected to the stationary contact (4), and the other connecting end (111b) of the outermost conductive ring (111) is electrically connected to the other terminal block (6); and the operating mechanism (5) drives the moving contact (3) and the stationary contact (4) to close or open.

14. The circuit breaker according to claim 13, characterized in that: The coil (11) of the magnetic release (1) comprises two conductive rings (111) and a conductive plate (113).

15. The circuit breaker according to claim 13, characterized in that: The circuit breaker is a miniature circuit breaker with a housing (2) in a convex shape and a thickness of 18 mm, and the conductive cross-sectional area of ​​the coil (11) is 25 mm. 2 .

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