Snap-type electromagnetic release and electronic device

Abstract

The application relates to the technical field of circuit breakers, and discloses a clapper type electromagnetic release and electronic equipment, wherein the clapper type electromagnetic release comprises an armature, a first magnetic yoke, a second magnetic yoke, a base, a current-carrying coil and a hinged shaft, the armature is rotatably installed on the base through the hinged shaft, the first magnetic yoke and the second magnetic yoke are arranged on the two sides of the armature respectively, and the first magnetic yoke and the second magnetic yoke are arranged in central symmetry relative to the hinged shaft; and the current-carrying coil is fixed on the base and passes through the first magnetic yoke and the second magnetic yoke. The application improves the sensitivity, stability and response consistency of a tripping action.

Description

Technical Field

[0001] This application relates to the field of circuit breaker technology, and in particular to a snap-action electromagnetic trip device and electronic equipment. Background Technology

[0002] With the rapid development of low-voltage electrical technology, electromagnetic trip units, as key protective components in circuit breakers, are widely used in overload and short-circuit protection scenarios. Their working principle involves detecting abnormal current in the circuit; when the current reaches a set threshold, the excitation coil generates a magnetic field, creating an electromagnetic attraction torque in the magnetic circuit system. This torque drives the armature to actuate and triggers the tripping mechanism, thereby achieving rapid circuit disconnection and ensuring the safe operation of the electrical system. Traditional two-air-gap snap-action electromagnetic trip units typically employ a structure design with a U-shaped yoke and a flat armature. Under normal operating conditions, this structure effectively establishes a stable magnetic circuit, ensuring reliable operation under rated frame current. However, in practical applications, when this type of electromagnetic trip unit is used in scenarios requiring reduced frame current, the ampere-turns of the excitation coil are significantly reduced, leading to a significant decrease in the electromagnetic attraction torque generated by the magnetic circuit system. This makes it difficult to overcome the resistance from the return spring and mechanical friction, thus affecting the reliability and timeliness of the tripping action. Utility Model Content

[0003] In view of this, the present application provides a snap-fit ​​electromagnetic trip unit and electronic device, which can effectively solve the problems of significant decrease in electromagnetic attraction torque of traditional two-air gap snap-fit ​​electromagnetic trip units and affect the reliability and timeliness of tripping action in application scenarios where the frame current is reduced.

[0004] In a first aspect, embodiments of this application provide a snap-action electromagnetic trip device, comprising: an armature, a first magnetic yoke, a second magnetic yoke, a base, a current-carrying coil, and a hinge shaft. The armature is rotatably mounted on the base via the hinge shaft. The first magnetic yoke and the second magnetic yoke are respectively disposed on both sides of the armature, and the first magnetic yoke and the second magnetic yoke are centrally symmetrically arranged with respect to the hinge shaft. The current-carrying coil is fixed on the base and passes through the first magnetic yoke and the second magnetic yoke.

[0005] In some embodiments, the first magnetic yoke is provided with a first hinge shaft hole and a second hinge shaft hole, and the armature is provided with a first rotating shaft hole and a second rotating shaft hole at both ends; the hinge shaft passes through the first hinge shaft hole, the first rotating shaft hole, the second rotating shaft hole, and the second hinge shaft hole in sequence, and is inserted into the third hinge shaft hole on the base.

[0006] In some embodiments, the current-carrying coil is further provided with a first mounting hole and a second mounting hole, the first magnetic yoke is provided with a first through hole, and the second magnetic yoke is provided with a second through hole; The first magnetic yoke is fixed to the current-carrying coil by passing through the first through hole and connecting to the first mounting hole via a first fastener; The second magnetic yoke is fixed to the current-carrying coil by passing through the second through hole in sequence with the second fastener and connecting to the second mounting hole.

[0007] In some embodiments, the first fastener and the second fastener are respectively configured as screws or rivets.

[0008] In some embodiments, the base is provided with a first positioning pin and a second positioning pin, the first magnetic yoke is provided with a first positioning pin hole, and the second magnetic yoke is provided with a second positioning pin hole. The first positioning pin is inserted into the first positioning pin hole; the second positioning pin is inserted into the second positioning pin hole.

[0009] In some embodiments, one end of the current-carrying coil is provided with a first electrical connection step for fixed connection with a first current-carrying wire, and the other end is provided with a second electrical connection step for fixed connection with a second current-carrying wire.

[0010] In some embodiments, the first electrical connection step and the second electrical connection step are both disposed on the same sidewall of the current-carrying coil, located at the beginning and end of the current-carrying coil, respectively.

[0011] In some embodiments, the base is provided with a limiting block for restricting the armature reset position.

[0012] In some embodiments, the base is provided with a flexible cantilevered latch; During rotation, the armature abuts against and presses the latch, causing the jumper linked to the latch to disengage from the locked state.

[0013] Secondly, embodiments of this application provide an electronic device, wherein the electronic device is provided with at least one snap-action electromagnetic trip unit as described in the first aspect above.

[0014] The embodiments of this application have the following beneficial effects: The snap-action electromagnetic trip device of this application includes: an armature, a first magnetic yoke, a second magnetic yoke, a base, a current-carrying coil, and a hinge shaft. The armature is rotatably mounted on the base via the hinge shaft. The first and second magnetic yokes are respectively disposed on both sides of the armature, and the first and second magnetic yokes are centrally symmetrically arranged with respect to the hinge shaft. The current-carrying coil is fixed on the base and passes through the first and second magnetic yokes. By symmetrically arranging the first and second magnetic yokes on both sides of the armature and centrally symmetrically arranged around the hinge shaft, combined with the current-carrying coil passing through the two magnetic yokes, this application can form a closed and symmetrically distributed double-sided magnetic circuit when energized, significantly improving the magnetic field utilization efficiency and magnetic force uniformity, thereby enhancing the electromagnetic attraction force and reducing the deflection torque during movement. When the coil is de-energized or the current is abnormal, the armature rotates around the hinge shaft and disengages from the attraction position under the action of a reaction spring or other reset mechanism, achieving rapid and reliable mechanical disconnection. This application improves the sensitivity, stability, and response consistency of the tripping action. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This paper shows a schematic diagram of the assembly structure of the snap-action electromagnetic trip device according to an embodiment of this application; Figure 2 A schematic diagram of the structure of the armature, first magnetic yoke, second magnetic yoke, current-carrying coil, and hinge shaft according to an embodiment of this application is shown. Figure 3 A cross-sectional view of an embodiment of this application along the hinge axis is shown; Figure 4 An exploded view of the snap-action electromagnetic trip device according to an embodiment of this application is shown.

[0017] Explanation of key component symbols: 10: Armature; 11: First pivot hole; 12: Second pivot hole; 20: First magnetic yoke; 21: First hinge shaft hole; 22: Second hinge shaft hole; 23: First through hole; 31: Second through hole; 24: First positioning pin hole; 30: Second magnetic yoke; 32: Second positioning pin hole; 40: Base; 41: Third hinge shaft hole; 42: First positioning pin; 43: Second positioning pin; 44: Limiting block; 45: Elastic cantilever lock; 46: Jumper lock; 50: Current-carrying coil; 51: First mounting hole; 52: Second mounting hole; 53: First electrical connection step; 54: Second electrical connection step; 55: First current-carrying conductor; 56: Second current-carrying conductor; 60: Hinged shaft; 70: First fastener; 80: Second fastener. Detailed Implementation

[0018] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0019] The components of the embodiments of this application described and illustrated in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0020] In the following text, the terms "comprising," "having," and their cognates, which may be used in various embodiments of this application, are intended only to indicate a particular feature, number, step, operation, element, component, or combination thereof, and should not be construed as primarily excluding the presence of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, or adding the possibility of one or more combinations thereof. Furthermore, the terms "first," "second," "third," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0021] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of this application pertain. Terms (such as those defined in commonly used dictionaries) shall be interpreted as having the same meaning as in their contextual meaning in the relevant technical field and shall not be construed as having an idealized or overly formal meaning, unless clearly defined in the various embodiments of this application.

[0022] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0023] Considering the significant decrease in electromagnetic engagement torque of traditional two-air-gap snap-action electromagnetic trip units in applications requiring reduced frame current, which affects the reliability and timeliness of tripping actions, this application addresses this issue. By symmetrically arranging the first magnetic yoke 20 and the second magnetic yoke 30 on both sides of the armature 10 and centrally symmetrically around the hinge axis 60, and with the current-carrying coil 50 passing through the two yokes, a closed and symmetrically distributed double-sided magnetic circuit can be formed when energized. This significantly improves the magnetic field utilization efficiency and magnetic force uniformity, thereby enhancing the electromagnetic engagement force and reducing the deflection torque during movement. When the coil is de-energized or the current is abnormal, the armature 10 rotates around the hinge axis 60 and disengages from the engagement position under the action of a reaction spring or other reset mechanism, achieving rapid and reliable mechanical disconnection. This application improves the sensitivity, stability, and response consistency of the tripping action.

[0024] The following describes the snap-action electromagnetic trip unit with some specific embodiments.

[0025] Figure 1 A schematic diagram of an assembly structure of a snap-action electromagnetic trip device according to an embodiment of this application is shown. Figure 2 A schematic diagram of the armature 10, first magnetic yoke 20, second magnetic yoke 30, current-carrying coil 50, and hinge shaft 60 of an embodiment of this application is shown. Exemplarily, the snap-action electromagnetic trip device of this application includes: armature 10, first magnetic yoke 20, second magnetic yoke 30, base 40, current-carrying coil 50, and hinge shaft 60.

[0026] The armature 10 is rotatably mounted on the base 40 via a hinge shaft 60. Under the influence of a strong magnetic field caused by a short-circuit current, it can rotate around the hinge shaft 60, thereby driving the locking mechanism to achieve a release action. This rotating structure ensures flexible operation, rapid response, and good repeatability and stability.

[0027] The first magnetic yoke 20 and the second magnetic yoke 30 are respectively disposed on both sides of the armature 10, and the first magnetic yoke 20 and the second magnetic yoke 30 are arranged in a centrally symmetrical manner with respect to the hinge shaft 60, forming two sets of independent but identical snap-fit ​​magnetic attraction pairs. Each set of magnetic attraction pairs consists of an air gap between a magnetic yoke and the armature 10, forming a total of four air gaps, constituting a centrally symmetrical four-air-gap snap-fit ​​magnetic release device structure.

[0028] Compared to traditional two-air-gap snap-action electromagnetic trip units, this application achieves a mirror-symmetric spatial layout by adding a set of magnetic attraction structures. Furthermore, the centrally symmetrical arrangement ensures that the electromagnetic attraction torques generated by the magnetic circuits on both sides when energized are in the same direction, effectively superimposing in the rotational direction of the armature 10 and significantly improving the total driving torque. Theoretical analysis shows that, under ideal conditions where material magnetic reluctance is neglected, the electromagnetic attraction force at a single air gap can be expressed by Maxwell's attraction force formula: ; in: Indicates the number of coil turns; This indicates the current flowing through the coil; Indicates the permeability of free space; Indicates the cross-sectional area of ​​the air gap; This indicates the air gap length.

[0029] Since the armature 10 rotates around the axis, the linear attraction force needs to be converted into a torque about the axis of rotation. Let the perpendicular distance from the point of application of the electromagnetic attraction force to the hinge axis 60 be... The electromagnetic attraction torque generated on one side is: ; in, This indicates the electromagnetic attraction torque on one side; This indicates the vertical distance from the point of application of the electromagnetic attraction force to the hinge axis 60.

[0030] In the centrally symmetrical structure of this application, the magnetic circuit on the other side has the same geometric dimensions and air gap. Cross-sectional area and distance Therefore, an electromagnetic attraction torque of equal magnitude is generated. Although the directions of the electromagnetic attraction forces on both sides point to their respective yokes, due to their symmetrical distribution about the axis of rotation, the resulting rotational torques are in the same direction, both causing the armature 10 to rotate in the closed direction, and thus can be linearly superimposed:

[0031] in, This represents the total electromagnetic attraction torque.

[0032] This means that the total electromagnetic attraction torque is at least doubled compared to the original two-air-gap structure. This effectively compensates for the unreliability of operation caused by the significant decrease in electromagnetic attraction torque due to the squared decrease in current when the shell current decreases from 63A to 32A.

[0033] The current-carrying coil 50 is fixed to the base 40 and passes through the first magnetic yoke 20 and the second magnetic yoke 30. This forms two independent but centrally symmetrical magnetic circuits with identical magnetic circuit parameters, allowing the short-circuit current to simultaneously excite both magnetic circuits when flowing through the coil. By adjusting the number of turns of the current-carrying coil 50, the ampere-turns can be flexibly controlled, thereby adjusting the magnitude of the electromagnetic attraction torque and further expanding the current range for stable operation of the electromagnetic trip unit, precisely adapting to the short-circuit protection requirements of different frame levels. This application employs a centrally symmetrical arrangement, ensuring not only that the magnetomotive forces of the two independent magnetic circuits are equal, but also that the electromagnetic attraction torques generated by each are in the same direction, with no lateral component force during the rotation of the armature 10, greatly improving the stability and long-term reliability of the operation.

[0034] Figure 3A cross-sectional view along the hinge axis 60 is shown, with a local magnetic circuit element extracted by section line AA to analyze the magnetic flux distribution characteristics of the air gap region. This section reflects the effective cross-sectional area of ​​the air gap. and air gap length The reluctance is the main factor determining the magnetic reluctance. Assuming the yoke and armature 10 are made of a high-permeability material, their internal reluctance is much smaller than the air gap reluctance and can be approximated as negligible, thus simplifying the magnetic circuit model. A current-carrying coil 50 surrounds this magnetic circuit unit, ensuring that the current excitation is directly coupled to the air gap region, efficiently generating the magnetic field driving force.

[0035] This application adds a magnetic attraction structure to the existing two-air-gap snap-action electromagnetic trip unit, arranging it in a centrally symmetrical manner to form a four-air-gap snap-action magnetic trip unit. This achieves the same-direction superposition of electromagnetic attraction torque, at least doubling its magnitude. Combined with adjusting the number of turns of the through-core coil, sufficient driving capability can be maintained even under low frame current, effectively expanding the current adjustment range and precisely achieving short-circuit protection. Simultaneously, the centrally symmetrical structure fundamentally avoids problems such as armature lateral deviation, frictional loss, and operational instability caused by magnetic circuit asymmetry, significantly improving the product's durability and safety performance.

[0036] Furthermore, the starting end and the ending end of the current-carrying coil 50 are respectively provided with a first electrical connection step 53 and a second electrical connection step 54. Both electrical connection steps are set on the same side wall of the current-carrying coil 50, extending along its outer periphery or inner surface to form a stepped structure that facilitates wire docking. The first electrical connection step 53 is used to fix the first current-carrying wire 55, and the second electrical connection step 54 is used to fix the second current-carrying wire 56. The two are located at opposite ends of the coil in spatial layout but are arranged in the same plane, so that the external current-carrying wires can be aligned and overlapped on the corresponding connection steps in the same plane, and then the electrical connection is achieved by welding. This makes the connection operation between the wire and the end of the coil more convenient, avoids the assembly difficulties and spatial interference caused by multi-directional wiring, improves the welding positioning accuracy and connection reliability, and is also conducive to the implementation of automated welding processes.

[0037] In addition, the structure of the electrical connection steps enhances the mechanical strength and conductive area of ​​the contact area, reduces contact resistance, and improves current carrying capacity and thermal stability, thereby ensuring the electrical connection safety and durability of the electromagnetic device under long-term operation or high current impact.

[0038] As an alternative solution, Figure 4 An exploded view of the snap-action electromagnetic trip device according to an embodiment of this application is shown.

[0039] In one embodiment, based on the above embodiments, such as Figure 1 and Figure 4As shown, the first magnetic yoke 20 is provided with a first hinge shaft hole 21 and a second hinge shaft hole 22, and the armature 10 is provided with a first rotating shaft hole 11 and a second rotating shaft hole 12 at both ends; wherein the armature 10 is installed inside the first magnetic yoke 20, and the two are rotatably connected by a common hinge shaft 60.

[0040] Specifically, the armature 10 has a first pivot hole 11 and a second pivot hole 12 on both sides, and the first magnetic yoke 20 has a first hinge shaft hole 21 and a second hinge shaft hole 22 on its corresponding side walls. The base 40 has a hinge shaft 60 hole for positioning and fixing. During assembly, the hinge shaft 60 passes through the first hinge shaft hole 21, the first pivot hole 11, the second pivot hole 12, and the second hinge shaft hole 22 in sequence, and is inserted into the third hinge shaft hole 41 on the base 40. This hinges the armature 10 and the first magnetic yoke 20 together on the base 40 in a rotatable manner, forming a stable pivot point. This allows the armature 10 to rotate smoothly around the hinge shaft 60 under the action of electromagnetic force, achieving reliable mechanical linkage, while ensuring the compactness of the overall structure, assembly accuracy, and stability and durability during movement.

[0041] In one embodiment, based on the above embodiments, such as Figure 1 and Figure 4 As shown, the current-carrying coil 50 is further provided with a first mounting hole 51 and a second mounting hole 52. The first magnetic yoke 20 is provided with a first through hole 23, and the second magnetic yoke 30 is provided with a second through hole 31. The first magnetic yoke 20 is fixed to the current-carrying coil 50 by passing through the first through hole 23 and connecting to the first mounting hole 51 through a first fastener 70. The second magnetic yoke 30 is fixed to the current-carrying coil 50 by passing through the second through hole 31 and connecting to the second mounting hole 52 through a second fastener 80. This makes the two magnetic yokes symmetrically and stably mounted on both sides of the current-carrying coil 50.

[0042] Among them, the first fastener 70 and the second fastener 80 can be standard fastening elements such as screws or rivets. When screws are used, a detachable connection can be achieved by screwing, which is convenient for maintenance and replacement. When rivets are used, permanent fastening is achieved through plastic deformation, which improves the overall mechanical strength and seismic performance of the structure. This not only achieves reliable fixation between the magnetic yoke and the current-carrying coil 50, ensuring that the components do not undergo relative displacement during electromagnetic operation, but also facilitates batch assembly and automated production, improving the assembly efficiency and consistency of the product.

[0043] In one embodiment, based on the above embodiments, such as Figure 1 and Figure 4As shown, the base 40 is provided with a first positioning pin 42 and a second positioning pin 43, the first magnetic yoke 20 is provided with a first positioning pin hole 24, and the second magnetic yoke 30 is provided with a second positioning pin hole 32. During assembly, the first magnetic yoke 20 and the second magnetic yoke 30 are installed in the designated positions on the base 40, so that the first positioning pin 42 is inserted into the first positioning pin hole 24 of the first magnetic yoke 20, and the second positioning pin 43 is inserted into the second positioning pin hole 32 of the second magnetic yoke 30. The precise fit between the positioning pins and the pin holes achieves accurate alignment of the magnetic yoke on the base 40. This effectively restricts the translational and rotational degrees of freedom of the magnetic yoke in the horizontal plane, ensuring the high consistency of its installation position and avoiding magnetic field asymmetry or jamming of moving parts caused by assembly deviations, thereby ensuring the overall central symmetry and operational reliability of the electromagnetic assembly. At the same time, the positioning pin structure is simple and has strong guiding properties, which is conducive to improving assembly efficiency and consistency of mass production, and provides a basic positioning guarantee for the subsequent installation of the hinge shaft 60 and the precise control of the movement trajectory of the armature 10.

[0044] In one embodiment, based on the above embodiments, such as Figure 1 and Figure 4 As shown, a limiting block 44 is provided on the base 40 to limit the reset position of the armature 10. The limiting block 44 corresponds to the movement trajectory of the armature 10 during the reset process. When the electromagnetic device is in the released state, the armature 10 rotates around the hinge shaft 60 under the action of the elastic element and tends to the reset position. Its movement stroke is finally physically stopped by the limiting block 44, thereby accurately limiting the reset endpoint position of the armature 10. By adjusting the installation position of the limiting block 44 on the base 40, the initial air gap size between the armature 10 and the yoke after reset can be changed. The length of the initial air gap directly affects the magnetic reluctance of the electromagnetic circuit and the electromagnetic torque generated during the attraction process, thereby adjusting the critical current value required for the armature 10 to be attracted, and realizing flexible adjustment of the tripping current threshold. This not only ensures the consistency of the armature 10 position after each reset and improves the repeatability accuracy of the action, but also provides a mechanically adjustable scheme for the protection characteristic setting of the product in different usage scenarios, enhancing the adaptability and reliability of the device.

[0045] Furthermore, the base 40 is provided with an elastic cantilever latch 45; the latch has an elastically deformable cantilever structure, one end of which is fixed to the base 40, and the other end forms a hook for locking, and is linked with the jumper 46. During rotation, the armature 10 abuts against and presses the latch, causing the jumper 46 linked with the latch to disengage from the locked state.

[0046] Specifically, when the armature 10 rotates around the hinge shaft 60 under the action of electromagnetic force, its moving part abuts against and presses down on the cantilever section of the latch, causing the cantilever to undergo elastic deformation and local bending or swinging. This transmits driving force through mechanical linkage, causing the trip latch 46 connected to it to overcome the holding force and disengage from its original locking position, releasing the constraint on the operating mechanism and triggering the tripping action of the circuit breaker. After the elastic cantilever structure completes the tripping, it can return to its initial state through its own elasticity, which is convenient for subsequent relocking and improves the compactness and consistency of the mechanism.

[0047] This application also provides an electronic device, exemplary of which includes the aforementioned snap-action electromagnetic trip unit.

[0048] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that, in alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and combinations of blocks in the block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0049] In addition, the functional modules or units in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0050] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a smartphone, personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application.

[0051] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A snap-action electromagnetic trip device, characterized in that, include: The armature (10), first yoke (20), second yoke (30), base (40), current-carrying coil (50), and hinge shaft (60) are provided. The armature (10) is rotatably mounted on the base (40) via the hinge shaft (60). The first yoke (20) and the second yoke (30) are respectively disposed on both sides of the armature (10), and the first yoke (20) and the second yoke (30) are centrally symmetrically arranged with respect to the hinge shaft (60). The current-carrying coil (50) is fixed on the base (40) and passes through the first yoke (20) and the second yoke (30).

2. The snap-action electromagnetic trip unit according to claim 1, characterized in that, The first magnetic yoke (20) is provided with a first hinge shaft hole (21) and a second hinge shaft hole (22), and the armature (10) is provided with a first rotating shaft hole (11) and a second rotating shaft hole (12) at both ends respectively; the hinge shaft (60) passes through the first hinge shaft hole (21), the first rotating shaft hole (11), the second rotating shaft hole (12), and the second hinge shaft hole (22) in sequence, and is inserted into the third hinge shaft hole (41) on the base (40).

3. The snap-action electromagnetic trip unit according to claim 1, characterized in that, The current-carrying coil (50) is also provided with a first mounting hole (51) and a second mounting hole (52), the first magnetic yoke (20) is provided with a first through hole (23), and the second magnetic yoke (30) is provided with a second through hole (31); The first magnetic yoke (20) passes through the first through hole (23) and is connected to the first mounting hole (51) via the first fastener (70), thereby fixing it to the current-carrying coil (50); The second magnetic yoke (30) is fixed to the current-carrying coil (50) by passing through the second through hole (31) in sequence with the second fastener (80) and connecting with the second mounting hole (52).

4. The snap-action electromagnetic trip unit according to claim 3, characterized in that, The first fastener (70) and the second fastener (80) are respectively configured as screws or rivets.

5. The snap-action electromagnetic trip unit according to claim 1, characterized in that, The base (40) is provided with a first positioning pin (42) and a second positioning pin (43), the first magnetic yoke (20) is provided with a first positioning pin hole (24), and the second magnetic yoke (30) is provided with a second positioning pin hole (32). The first positioning pin (42) is inserted into the first positioning pin hole (24); The second positioning pin (43) is inserted into the second positioning pin hole (32).

6. The snap-action electromagnetic trip unit according to claim 1, characterized in that, One end of the current-carrying coil (50) is provided with a first electrical connection step (53) for fixed connection with the first current-carrying wire (55), and the other end is provided with a second electrical connection step (54) for fixed connection with the second current-carrying wire (56).

7. The snap-action electromagnetic trip unit according to claim 6, characterized in that, The first electrical connection step (53) and the second electrical connection step (54) are both disposed on the same side wall of the current-carrying coil (50), located at the beginning and end of the current-carrying coil (50), respectively.

8. The snap-action electromagnetic trip unit according to claim 1, characterized in that, The base (40) is provided with a limiting block (44) for limiting the reset position of the armature (10).

9. The snap-action electromagnetic trip unit according to claim 1, characterized in that, The base (40) is provided with an elastic cantilever lock (45). During rotation, the armature (10) abuts against and presses the latch, causing the jumper (46) linked with the latch to disengage from the locked state.

10. An electronic device, characterized in that, The electronic device is provided with a snap-action electromagnetic trip unit as described in any one of claims 1-9.

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