Miniature circuit breakers

Abstract

The present invention relates to the field of low-voltage electrical appliances, and in particular to a miniature circuit breaker, comprising a circuit breaker housing, an operating button, and an operating mechanism and a short-circuit protection mechanism respectively arranged in the circuit breaker housing; the operating button is arranged at one end of the circuit breaker housing, and operating the operating button closes / opens the miniature circuit breaker via the operating mechanism; the short-circuit protection mechanism is driven and cooperates with the operating mechanism; the short-circuit protection mechanism is a snap-on electromagnetic mechanism, and the operating button and the short-circuit protection mechanism are arranged opposite to and on opposite sides of the operating mechanism; the miniature circuit breaker of the present invention has a more reasonable layout.

Description

Technical Field

[0001] The present invention relates to the field of low-voltage electrical appliances, and in particular to a miniature circuit breaker. Background Art

[0002] The use of circuit breakers can effectively improve the safety of electrical equipment and has been widely used. However, existing circuit breakers often have the following problems:

[0003] First, existing circuit breakers are generally installed in distribution boxes. When a line fault occurs and needs to be repaired or a failed circuit breaker needs to be replaced, operators need to check the circuit breakers installed on the line step by step, which is relatively cumbersome. Especially for plug-in circuit breakers, they are generally installed in cabinets and there are many installed. When repairing or replacing a faulty circuit breaker, finding a specific circuit breaker, or judging the status of the circuit breaker, it takes a lot of time and effort, which affects the efficiency of repair, search, or judgment, and poses certain safety hazards.

[0004] Second, when circuit breakers are used on some specific equipment with limited space, there are defects such as being unable to install or having high installation costs.

[0005] 3. The signal output component of the circuit breaker can only output a single type of signal, which cannot meet the needs; and the installation reliability of the signal output component is low. Summary of the Invention

[0006] The purpose of the present invention is to overcome the defects of the prior art and provide a miniature circuit breaker with a more reasonable layout.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A miniature circuit breaker includes a circuit breaker housing 2, an operating button 1, and an operating mechanism 4 and a short-circuit protection mechanism 6, respectively disposed within the circuit breaker housing 2. The operating button 1 is disposed at one end of the circuit breaker housing 2, and operating the operating button 1 closes / opens the miniature circuit breaker via the operating mechanism 4. The short-circuit protection mechanism 6 cooperates with the operating mechanism 4 in a driving manner. The short-circuit protection mechanism 6 is a snap-on electromagnetic mechanism, and the operating button 1 and the short-circuit protection mechanism 6 are disposed opposite each other and on opposite sides of the operating mechanism 4.

[0009] Preferably, the short-circuit protection mechanism 6 includes a yoke 61, an armature 60, an armature tension spring 63 and a conductive plate 64. The conductive plate 64 is arranged in the middle of the yoke 61. One end of the armature 60 is rotatably arranged. The armature 60 and the yoke 61 are relatively matched. One end of the armature tension spring 63 is connected to the armature 60 and the other end is connected to the circuit breaker housing 2. The angle between the axis of the armature tension spring 63 and the axis of the armature 60 is an acute angle.

[0010] Preferably, when the armature 60 and the yoke 61 are attracted, the angle between the axis of the armature tension spring 63 and the axis of the armature 60 is α, and 3°≤α≤30°.

[0011] Preferably, the armature 60 includes a plurality of spring holes, which are arranged side by side and spaced apart from each other, and are offset in the direction of the armature tension spring 63 from the first to the last spring hole.

[0012] Preferably, the axis of the magnetic yoke 61 is parallel to the axial direction of the circuit breaker housing 2 .

[0013] Preferably, the operating mechanism 4 includes a handle member 44, a second connecting rod 45, a rotating plate 43, a locking member 41 and a tripping member 42. The handle member 44 and the rotating plate 43 are respectively rotatably arranged on the circuit breaker housing 2, the locking member 41 and the tripping member 42 are respectively rotatably arranged on the rotating plate 43 and locked together, and the handle member 44 is connected to the locking member 41 through the second connecting rod 45; the operating button 1 is driven and connected to the handle member 44 to drive the handle member 44 to rotate.

[0014] Preferably, the miniature circuit breaker further includes an overload protection mechanism 2a, and the tripping member 42 includes a tripping actuated column 40. The overload protection mechanism 2a and the short-circuit protection mechanism 6 are respectively driven to cooperate with the tripping actuated column 40 to drive the tripping member 42 to rotate and release the locking cooperation with the locking member 41.

[0015] Preferably, the miniature circuit breaker further comprises a driving link 5 rotatably arranged on the circuit breaker housing 2 , and both ends of the driving link 5 are respectively driven and matched with the tripping driven column 40 and the armature 60 of the short-circuit protection mechanism 6 .

[0016] Preferably, the middle portion of the tripping buckle driven column 40 is connected to the tripping buckle, one end of the tripping buckle is driven and matched with the overload protection mechanism 2a, and the other end of the tripping buckle is driven and matched with the short-circuit protection mechanism 6.

[0017] Preferably, the yoke 61 is a U-shaped structure, including a yoke bottom plate 612 and a pair of yoke arms 611. The two yoke arms 611 are respectively connected to the two ends of the yoke bottom plate 612 by bending. One end of each yoke arm 611 is provided with an armature slot 610, and the two armature slots 610 are located at the same end of the yoke 61.

[0018] The armature 60 includes two armature support arms 600 arranged at one end thereof and spaced side by side. A limiting square groove 6000 is provided at one end corner of each armature support arm 600. The two limiting square grooves 6000 are respectively located at the two ends of the two armature support arms 600 and respectively cooperate with the two armature slots 610.

[0019] Preferably, the armature 60 includes an opening 65 arranged in the middle thereof, and three spring holes are arranged on one side of the opening 65, namely the first spring hole 65-0, the second spring hole 65-1 and the third spring hole 65-2. The three spring holes are arranged side by side in sequence along the length direction of the armature 60.

[0020] The short-circuit protection mechanism 6 of the miniature circuit breaker of the present invention is a snap-action electromagnetic mechanism. The operating button 1 and the short-circuit protection mechanism 6 are positioned opposite and on opposite sides of the operating mechanism 4. This creates a more rational layout for the miniature circuit breaker, facilitates size reduction, and conforms to the trend of miniaturization. Furthermore, the axis of the armature tension spring 63 of the short-circuit protection mechanism 6 forms an acute angle with the axis of the armature 60. This minimizes the stretching gain (or tension gain) of the armature tension spring 63 during the engagement of the armature 60 and the yoke 61, facilitating rapid engagement of the armature 60 and the yoke 61, thereby improving the breaking capacity of the miniature circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a miniature circuit breaker of the present invention, wherein the short-circuit protection mechanism thereof is a snap-on electromagnetic mechanism;

[0022] Figure 2 This is a schematic diagram of the structure of the miniature circuit breaker of the present invention. Figure 1 In comparison, the partition is omitted;

[0023] Figure 3 This invention Figure 1 A schematic diagram of the enlarged structure of part A;

[0024] Figure 4 This invention Figure 2 A schematic diagram of the enlarged structure of part B;

[0025] Figure 5 It is a structural diagram of a miniature circuit breaker of the present invention, wherein the short-circuit protection mechanism thereof is a direct-acting electromagnetic mechanism;

[0026] Figure 6 2 is a schematic diagram of the three-dimensional structure of the short-circuit protection mechanism of the present invention, which is a snap-on electromagnetic mechanism;

[0027] Figure 7 1 is a schematic side projection structure diagram of the short-circuit protection mechanism of the present invention, which is a snap-on electromagnetic mechanism, and at least shows the angle between the armature and the armature tension spring when the armature and the yoke are attracted;

[0028] Figure 8 Schematic diagram of the exploded structure of the short-circuit protection mechanism of the present invention, which is a snap-on electromagnetic mechanism;

[0029] Figure 9AThis is a schematic structural diagram of a first embodiment of an overload protection mechanism of the present invention, wherein the bimetallic strip is connected to the first conductive plate via a first flexible connection, is connected to the static contact via a second flexible connection, and the first conductive plate and the static contact are connected via a third flexible connection;

[0030] Figure 9B 2 is a schematic structural diagram of a second embodiment of the overload protection mechanism of the present invention, wherein the bimetallic strip is connected to the first conductive plate via a first flexible connection and is connected to the static contact via a second flexible connection;

[0031] Figure 10 It is a structural schematic diagram of the partition of the present invention;

[0032] Figure 11 is a schematic structural diagram of the signal output assembly of the present invention, showing at least the structure of one side of the printed circuit board;

[0033] Figure 12 is a schematic structural diagram of the signal output assembly of the present invention, at least showing the structure of the other side of the printed circuit board;

[0034] Figure 13A This is a schematic diagram of the circuit principle of the first embodiment of the signal output component of the present invention;

[0035] Figure 13B 1 is a schematic diagram of the circuit principle of the second embodiment of the signal output component of the present invention;

[0036] Figure 14 is a schematic structural diagram of a miniature circuit breaker of the present invention, showing at least a button observation hole;

[0037] Figure 15 It is a schematic diagram of the coordinated structure of the signal light, light guide element, indicator and operating button when the miniature circuit breaker of the present invention is in the open state;

[0038] Figure 16 1 is a schematic structural diagram of a first embodiment of a light guide element according to the present invention, illustrating the propagation path of light emitted by a signal lamp in the light guide element when the miniature circuit breaker is in the open state;

[0039] Figure 17 Schematic diagram of the coordination structure of the driving member and the indicating member when the miniature circuit breaker of the present invention is in the open state;

[0040] Figure 18 This is a schematic diagram of the structure of the driving member and the indicating member in another angle of coordination when the miniature circuit breaker of the present invention is in the open state;

[0041] Figure 19 It is a schematic diagram of the coordinated structure of the signal light, light guide element, indicator and operating button when the miniature circuit breaker of the present invention is in the closed state;

[0042] Figure 20 is a structural schematic diagram of a first embodiment of a light guide element of the present invention, illustrating the propagation path of light emitted by a signal lamp in the light guide element when a miniature circuit breaker is in a closed state;

[0043] Figure 21 Schematic diagram of the coordination structure of the driving member and the indicating member when the miniature circuit breaker of the present invention is in the closed state;

[0044] Figure 22 1 is a schematic diagram of the matching structure of the driving member and the indicating member at another angle when the miniature circuit breaker of the present invention is in the closed state;

[0045] Figure 23 It is a structural schematic diagram of the indicator of the present invention;

[0046] Figure 24 It is a schematic diagram of the coordinated structure of the signal light, the light guide element and the operating button when the miniature circuit breaker of the present invention is in the closed state;

[0047] Figure 25 This is a schematic diagram of the coordinated structure of the signal light, the light guide element and the operating button when the miniature circuit breaker of the present invention is in the open state;

[0048] Figure 26 is a schematic structural diagram of a miniature circuit breaker of the present invention, showing at least an observation hole of the housing;

[0049] Figure 27 This is a schematic diagram of the coordinated structure of the signal lamp, light guide element and housing observation hole of the miniature circuit breaker of the present invention. The light emitted by the signal lamp is reflected once and then emitted from the light guide element.

[0050] Figure 28 is a schematic structural diagram of a second embodiment of a light guide element of the present invention;

[0051] Figure 29 This is a schematic diagram of the coordinated structure of the signal lamp, light guide element, and housing observation hole of the miniature circuit breaker of the present invention. The light emitted by the signal lamp is reflected three times before exiting the light guide element.

[0052] Figure 30 2 is a schematic structural diagram of a third embodiment of a light guide element according to the present invention. DETAILED DESCRIPTION

[0053] The following is combined with Figure 1-30 The following embodiments are provided to further illustrate the specific implementation of the miniature circuit breaker of the present invention. The miniature circuit breaker of the present invention is not limited to the description of the following embodiments.

[0054] like Figure 1 、 2As shown in Figures 5, 14, and 26, the miniature circuit breaker of the present invention includes a circuit breaker housing 2 and an operating button 1, as well as an operating mechanism 4, a moving contact 1-1a and a static contact 1-0a used in conjunction with each other, an arc extinguishing chamber 9, an overload protection mechanism 2a, and a short-circuit protection mechanism 6, which are respectively arranged in the circuit breaker housing 2; the operating button 1 is arranged at one end of the circuit breaker housing 2, and one end of the operating button 1 is inserted into the circuit breaker housing 2 and slides with the circuit breaker housing 2; the operating button 1 is connected to the operating mechanism 4 by driving, and the operating mechanism 4 is driven by the moving contact 1-1a. The miniature circuit breaker is connected to the circuit breaker, and pressing / pulling the operating button 1 drives the moving contact 1-1a and the static contact 1-0a to close / open through the operating mechanism 4, so that the miniature circuit breaker is closed / opened; the overload protection mechanism 2a and the short-circuit protection mechanism 6 are respectively driven and cooperated with the operating mechanism 4. When the miniature circuit breaker has an overload or short-circuit fault, the overload protection mechanism 2a or the short-circuit protection mechanism 6 drives the operating mechanism 4 to operate, so that the miniature circuit breaker is opened (or tripped); the arc extinguishing chamber 9 is used to extinguish the arc generated when the moving contact 1-1a and the static contact 1-0a are closed or disconnected.

[0055] It should be noted that the arc extinguishing chamber 9, overload protection mechanism 2a and short-circuit protection mechanism 6 can be provided or omitted according to actual needs, that is, the miniature circuit breaker can be provided without one or more of the three. The miniature circuit breaker of the present invention preferably includes the arc extinguishing chamber 9, the overload protection mechanism 2a and the short-circuit protection mechanism 6.

[0056] Preferably, Figure 1 、 2 As shown in Figures 5 and 6, the internal layout of the miniature circuit breaker of the present invention is improved, specifically as follows: the overload protection mechanism 2a and the operating mechanism 4 are stacked in the middle of the circuit breaker housing 2, and the operating button 1 is located on one side of the operating mechanism 4. Figure 1 、 2 As shown in Figures 5 and 6, the arc extinguishing chamber 9 and the short-circuit protection mechanism 6 are arranged side by side on the other side of the operating mechanism 4. Figure 1 、 2As shown in Figures 5 and 6, the miniature circuit breaker of the present invention further includes a first terminal 7 and a second terminal 3a, respectively disposed at opposite ends of the circuit breaker housing 2. The second terminal 3a and the operating button 1 are located at the same end of the circuit breaker housing 2. The first terminal 7 and the second terminal 3a serve as the input and output terminals of the miniature circuit breaker, respectively. One of the first terminal 7 and the second terminal 3a is electrically connected to the static contact 1-0a, and the other is electrically connected to the movable contact 1-1a. The input terminal is connected to a power source, and the output terminal is connected to an external load. In this embodiment, the first terminal 7 serves as the input terminal, and the second terminal 3a serves as the output terminal. The first terminal 7 is connected to the movable contact 1-1a, and the second terminal 3a is electrically connected to the static contact 1-0a. Alternatively, the second terminal 3a can serve as the input terminal and the first terminal 7 as the output terminal. Alternatively, the first terminal 7 can be electrically connected to the static contact 1-0a, while the second terminal 3a is connected to the movable contact 1-1a. The miniature circuit breaker of the present invention has a carefully designed internal layout, which is more reasonable and makes fuller use of the internal space of the circuit breaker housing 2, making the entire miniature circuit breaker more compact, which is conducive to reducing the overall specifications of the miniature circuit breaker and conforming to the miniaturization development trend of miniature circuit breakers.

[0057] Preferably, Figure 1-5 As shown, the miniature circuit breaker of the present invention further includes a signal output assembly 8. The signal output assembly 8 and the first terminal 7 are located at the same end of the circuit breaker housing 2. The signal output assembly 8 is located between two first terminals 7 arranged side by side. One of the two first terminals 7 is used to connect to the L pole of the power supply, and the other is used to connect to the N pole.

[0058] Preferably, Figure 13A and 13BAs shown, the signal output assembly 8 includes a first signal terminal 83, a current-limiting resistor 85, a second signal terminal 82, and a diode 84. The first signal terminal 83 is electrically connected to the output terminal via the current-limiting resistor 85; the second signal terminal 82 is electrically connected to the output terminal via the diode 84. Alternatively, the second signal terminal 82 is connected to the output terminal of the circuit breaker via the series-connected current-limiting resistor 85 and diode 84. In this embodiment, the second terminal 3a serves as the output terminal, the first terminal 7 is connected to the movable contact 1-1a, the second terminal 3a is electrically connected to the stationary contact 1-0a, the first signal terminal 83 is electrically connected to the stationary contact 1-0a via the current-limiting resistor 85, and the second signal terminal 82 is electrically connected to the stationary contact 1-0a via the diode 84. The signal output component 8, its current-limiting resistor 85 can increase the total resistance value of the load on the first signal terminal 83, thereby preventing the temporary large current generated during the closing / opening of the small circuit breaker (closing / opening of the moving contact 1-1a and the static contact 1-0a) from burning the signal terminal equipment; at the same time, the current-limiting resistor 85 also plays a voltage dividing role, preventing users or other personnel from accidentally touching the second signal terminal 82 and causing the risk of electric shock; when the current-limiting resistor 85 is connected in series between the output terminal of the circuit breaker and the diode 84, it can simultaneously reduce the voltage value at the first signal terminal 82 and the second signal terminal 83, on the one hand, reducing the risk of electric shock caused by accidental touch by users or other personnel, and on the other hand, avoiding the signal terminal equipment connected to the first signal terminal 82 and the second signal terminal 83 respectively from being burned; the diode 84 can filter the signal output from the second signal terminal 82, converting the AC signal into a DC signal, so that the signal output component 8 can output AC and DC signals respectively to meet different needs.

[0059] like Figure 1-3 As shown in Figures 11-12, the signal output assembly 8 includes a printed circuit board 80 and a first signal terminal 83 and a second signal terminal 82 respectively provided on the printed circuit board 80. The printed circuit board 80 is inserted into the circuit breaker housing 2. Figure 11-12 As shown, the current limiting resistor 85 and the diode 84 are both provided on the printed circuit board 80. Figure 11-12As shown, the signal output component 8 also includes a contact terminal 81, which is used to electrically connect to the output terminal, for example, the contact terminal 81 is connected to the static contact 1-0a, or the contact terminal 81 is connected to the arc-starting plate or the terminal board connected to the static contact 1-0a, or is connected to the arc-starting plate or the terminal board connected to the moving contact 1-1a; the current-limiting resistor 85 is connected in series between the contact terminal 81 and the first signal terminal 83, and the diode 84 is connected in series between the contact terminal 81 and the second signal terminal 82; or, the current-limiting resistor 85 and the diode 84 are connected in series between the contact terminal 81 and the second signal terminal 82 in sequence, and the first signal terminal 83 is connected to the node between the current-limiting resistor 85 and the diode 84. The signal output assembly 8 is an integrated component that can be inserted into the circuit breaker housing 2 via a printed circuit board 80 for fixation and installation. The contact terminal 81, the first signal terminal 83, and the second signal terminal 82 facilitate the wiring of the signal output assembly 8, thereby significantly improving the installation and wiring efficiency of the signal output assembly 8 and facilitating user operation.

[0060] Preferably, Figure 1 、 2 As shown in FIG5 , the operating mechanism 4 includes a locking member 41 and a tripping member 42 that lock and match. The tripping member 42 includes a tripping actuated column 40 that drives and matches the overload protection mechanism 2a and the short-circuit protection mechanism 6. Figure 1 、 2 As shown in FIG5 , the overload protection mechanism 2a and the short circuit protection mechanism 6 push the tripping activated column 40 from the same side of the tripping activated column 40, respectively, so that the tripping member 42 rotates and releases the lock fit with the lock member 41. Figure 1 and 2 As shown, the middle portion of the tripping actuator post 40 is connected to the tripping member 42, one end of which is driven and engaged by the overload protection mechanism 2a, and the other end of which is driven and engaged by the short-circuit protection mechanism 6. In the miniature circuit breaker of the present invention, both the overload protection mechanism 2a and the short-circuit protection mechanism 6 are driven and engaged by the tripping actuator post 40, thereby tripping the miniature circuit breaker when an overload or short-circuit fault occurs. Compared with existing miniature circuit breakers, the internal structure of the miniature circuit breaker is simplified, making the internal layout of the miniature circuit breaker more compact.

[0061] Preferably, Figure 1-2 As shown in 6-8, the short-circuit protection mechanism 6 is a snap-on electromagnetic mechanism, comprising a yoke 61, an armature 60, an armature tension spring 63 and a conductive plate 64. The conductive plate 64 is arranged in the middle of the yoke 61. One end of the armature 60 is rotatably arranged. The armature 60 and the yoke 61 are relatively matched. One end of the armature tension spring 63 is connected to the armature 60 and the other end is fixed. The angle between the axis of the armature tension spring 63 and the axis of the armature 60 is an acute angle. Further, as Figure 7As shown, when the armature 60 and the yoke 61 are attracted, the angle between the axis of the armature tension spring 63 and the axis of the armature 60 is α, 3°≤α≤30°. The angle between the axis of the armature tension spring 63 and the axis of the armature 60 of the short-circuit protection mechanism 6 is an acute angle, so that during the attraction process of the armature 60 and the yoke 61, the stretching increase (or tension increase) of the armature tension spring 63 is small, which is conducive to the rapid attraction of the armature 60 and the yoke 61, thereby improving the breaking capacity of the miniature circuit breaker. Further, as Figure 6-8 As shown, the armature 60 includes a plurality of spring holes, which are arranged side by side and spaced apart. From the first to the last spring hole, they are offset in the direction of the armature tension spring 63, so that the short-circuit protection mechanism 6 can adjust the connection position of the armature tension spring 63 and the armature 60 (connected to the armature 60 through different spring holes) to achieve the adjustment of the suction and reaction force characteristics, thereby meeting the protection characteristics requirements of the small circuit breaker.

[0062] Expenditures required, such as Figure 5 As shown, the short-circuit protection mechanism 6 of the miniature circuit breaker of the present invention can also be a direct-acting electromagnetic mechanism; the miniature circuit breaker of the present invention preferably adopts the short-circuit protection mechanism 6 of the snap-action electromagnetic mechanism, so as to more conveniently adjust the suction and reaction force characteristics.

[0063] Preferably, Figure 1-2 As shown in Figures 9A-9B, the overload protection mechanism 2a includes a first conductive plate 20a, a first connecting plate 22a and a bimetallic strip 23a, and the two ends of the first connecting plate 22a are respectively connected to the first conductive plate 20a and the bimetallic strip 23a; the bimetallic strip 23a is connected to the first conductive plate 20a through a first soft connection 240a and is connected to the static contact 1-0a through a second soft connection 241a; a third soft connection 242a can be optionally set between the first conductive plate 20a and the static contact 1-0a. When the overload protection mechanism 2a is used for small current specifications (current value of 63A and below), the third soft connection 242a is not provided between the first conductive plate 20a and the static contact 1-0a to meet the heating requirements of the bimetallic strip 23a; when the overload protection mechanism 2a is used for large current specifications (current value of 63A and above), the first conductive plate 20a and the static contact 1-0a are connected through the third soft connection 242a, which ensures the heating requirements of the bimetallic strip 23a and the cut-off cross-section requirements of the soft connection. Further, as Figures 9A-9BAs shown, one end of the first connecting plate 22a is connected to the middle portion of the first conductive plate 20a, and the other end is connected to one end of the bimetallic strip 23a. The overload protection mechanism 2a also includes an adjustment screw 21a, which is disposed on the first conductive plate 20a and threadedly connected thereto. One end of the adjustment screw 21a engages with the first connecting plate 21a. The arrangement of the adjustment screw 21a on the first conductive plate 20a, compared to the prior art arrangement of the adjustment screw 21a on the circuit breaker housing 2, avoids the situation in which the position of the adjustment screw 21a changes due to thermal deformation of the circuit breaker housing 2, which could lead to instability in the circuit breaker's overload characteristics.

[0064] It should be pointed out that the first connecting plate 22a is generally made of standard materials such as brass and carbon steel, has a large internal resistance and a relatively long length, has a certain elasticity, and can well withstand the force applied by the adjusting screw 21a, thereby adjusting the position of the bimetallic strip 23a to adjust the overload characteristics of the circuit breaker; the first soft connection 240a, the second soft connection 241a and the third soft connection 242a are made of good conductors, with the characteristics of short length, large cross-section and small internal resistance, forming three current channels to carry most of the current.

[0065] Preferably, Figure 14-29 As shown, the miniature circuit breaker of the present invention further includes a PCB board 7a and a light guide element 5a disposed within the circuit breaker housing 2, as well as an observation hole. The PCB board 7a is provided with a signal light 8a. One end of the light guide element 5a engages with the signal light 8a, and the other end engages with the observation hole. The light guide element 5a of the miniature circuit breaker of the present invention transmits light emitted by the signal light 8a to the observation hole, making it easy for a user to observe the lighting status of the signal light 8a. This allows for quick user notification when repairing or replacing a faulty miniature circuit breaker, locating a specific circuit breaker, or determining the circuit breaker's status (open / closed / tripped), thereby improving work efficiency and ensuring user safety.

[0066] It should be noted that the indicator light 8a can be set to indicate the opening / closing state, fault state, etc. of the miniature circuit breaker as needed, or to provide specific indications according to control commands.

[0067] Preferably, Figure 16 、 20 As shown in Figures 28-29, the light guide element 5a includes at least one reflecting surface for reflecting the light of the signal lamp 8a, and the light of the signal lamp 8a reaches the observation hole after at least one reflection. Figure 16 、 20 As shown in Figures 28-29, the direction in which the light of the signal lamp 8a enters the light guide element 5a is a first direction, and the direction in which the light of the signal lamp 8a exits the light guide element 5a is a second direction, and the first direction is perpendicular to the second direction. Figure 16 、20 As shown in Figures 28-29, the light-guiding element 5a includes 2n+1 reflecting surfaces, where n is a natural number.

[0068] The following is an embodiment of a miniature circuit breaker of the present invention.

[0069] like Figure 1 、 2 As shown in Figures 5 and 6, the miniature circuit breaker of the present invention includes a circuit breaker housing 2, an operating button 1, and an operating mechanism 4, a movable contact 1-1a and a static contact 1-0a used in conjunction with each other, an overload protection mechanism 2a, a short-circuit protection mechanism 6, an arc extinguishing chamber 9, a first terminal 7 and a second terminal 3a, which are respectively arranged in the circuit breaker housing 2; by pressing / pulling the operating button 1, the miniature circuit breaker is closed / opened through the operating mechanism 4.

[0070] Preferably, Figure 1 、 2 As shown in Figures 3 and 5, the operation button 1 is arranged at one end of the circuit breaker housing 2, and one end of the operation button 1 is inserted into the circuit breaker housing 2 and slides with the circuit breaker housing 2; the first terminal 7 and the second terminal 3a are respectively arranged at both ends of the circuit breaker housing 2, and the second terminal 3a and the operation button 1 are arranged side by side at one end of the circuit breaker housing 2; the overload protection mechanism 2a and the operating mechanism 4 are stacked in the middle of the circuit breaker housing 2, and the short-circuit protection mechanism 6 and the arc extinguishing chamber 9 are arranged side by side and located between the operating mechanism 4 and the first terminal 7; the operation button 1 and the short-circuit protection mechanism 6 are opposite to each other and are respectively located on both sides of the operating mechanism 4, and the second terminal 3a and the arc extinguishing chamber 9 are opposite to each other and are respectively located on both sides of the operating mechanism 4.

[0071] Preferably, the first terminal 7 is the incoming terminal of the miniature circuit breaker, and the second terminal 3a is the outgoing terminal of the miniature circuit breaker. Figure 1 and 2 As shown, the miniature circuit breaker of the present invention is a two-phase miniature circuit breaker, wherein two first terminals 7 are arranged side by side and spaced apart at one end of the circuit breaker housing 2, and two second terminals 3a are arranged side by side and spaced apart at the other end of the circuit breaker housing 2.

[0072] Specifically, such as Figure 1 、 2 , 5, and the direction shown in Figure 1 、 2, 5 and the side facing the reader are the upper, lower, left, right and front sides of the miniature circuit breaker; the operation button 1 is arranged at the upper end of the circuit breaker housing 2, and the lower end of the operation button 1 is inserted into the circuit breaker housing 2 and slides with the circuit breaker housing 2; the second terminal 3a and the first terminal 7 are respectively arranged at the upper and lower ends of the circuit breaker housing 2, and the second terminal 3a and the operation button 1 are arranged side by side at the upper end of the circuit breaker housing 2; the overload protection mechanism 2a and the operating mechanism 4 are stacked front and back in the middle of the circuit breaker housing 2, and the arc extinguishing chamber 9 and the short-circuit protection mechanism 6 are arranged side by side and located between the operating mechanism 4 and the first terminal 7; the operation button 1 and the short-circuit protection mechanism 6 are opposite and are respectively located on the upper and lower sides of the operating mechanism 4, and the second terminal 3a and the arc extinguishing chamber 9 are opposite and are respectively located on the upper and lower sides of the operating mechanism 4.

[0073] Preferably, Figure 1 and 10 As shown, the miniature circuit breaker of the present invention further includes a partition 3, the circuit breaker housing 2 includes a housing base, and the operating mechanism 4 is disposed between the partition 3 and the housing base. The overload protection mechanism 2a, the operating mechanism 4, and the housing base are disposed in sequence. Furthermore, the miniature circuit breaker of the present invention includes two second inlet terminals 3, one disposed on either side of the partition 3.

[0074] Preferably, Figure 1 、 2 5 is an embodiment of the operating mechanism 4, which is specifically as follows: the operating mechanism 4 includes a second connecting rod 45, a handle member 44, a rotating plate 43, a tripping member 42 and a locking member 41, the handle member 44 and the rotating plate 43 are respectively rotatably set on the circuit breaker housing 2, the locking member 41 and the tripping member 42 are respectively rotatably set on the rotating plate 43 and locked together, the handle member 44 is driven and connected to the locking member 41 through the second connecting rod 45, and the rotating plate 43 is driven and connected to the static contact 1-0a; the operating button 1 is driven and connected to the handle member 44 through the first connecting rod 46.

[0075] It should be noted that the structure of the operating mechanism 4 is not limited to the above-mentioned one. Existing multi-link type operating mechanisms that achieve multi-link balance by locking and matching at least two components can be applied to the miniature circuit breaker of this application.

[0076] Preferably, Figure 1 、 2 As shown in Figures 5 and 6, the tripping member 42 includes a tripping actuator column 40 that is driven and matched with the overload protection mechanism 2a and the short-circuit protection mechanism 6, respectively. When an overload fault or a short-circuit fault occurs in the miniature circuit breaker, the overload protection mechanism 2a or the short-circuit protection mechanism 6 drives the tripping member 42 to rotate through the tripping actuator column 40 and releases the lock match with the lock member 41, and the miniature circuit breaker is opened. Figure 1 and2 As shown, the middle part of the tripping latch actuated column 40 is connected to the tripping latch 42, one end of the tripping latch actuated column 40 is driven and matched with the overload protection mechanism 2a, and the other end is driven and matched with the short circuit protection mechanism 6. Figure 1 、 2 As shown in Figures 5 and 6, the overload protection mechanism 2a and the short-circuit protection mechanism 6 are directly driven to cooperate with the tripping activated column 40 from one side thereof, and the tripping activated column 40 drives the tripping member 42 to rotate and release the locking cooperation with the locking member 41.

[0077] Specifically, such as Figure 1 and 2 Direction shown, Figure 1 、 2 The upper, lower, left and right sides and the side facing the reader are the upper, lower, left, right and front sides of the small circuit breaker; the front end of the tripping activated column 40 is driven and cooperated with the overload protection mechanism 2a, and the rear end is driven and cooperated with the short-circuit protection mechanism 6; the overload protection mechanism 2a and the short-circuit protection mechanism 6 are both driven and cooperated with it from the lower side of the tripping activated column 40.

[0078] Preferably, Figure 1 、 2 As shown in Figures 5 and 5 , the overload protection mechanism 2a includes a bimetallic strip 23a driven by a tripping activated column 40.

[0079] Preferably, Figure 1 、 2 As shown, the short-circuit protection mechanism 6 is a snap-on electromagnetic mechanism, including an armature 60 driven by the tripping driven column 40. Figure 1 and 2 As shown, the miniature circuit breaker of the present invention further comprises a driving link 5, the middle portion of which is rotatably arranged on the circuit breaker housing 2, and the two ends of which are respectively driven and matched with the armature 60 and the tripping driven column 40.

[0080] Preferably, Figure 5 As shown, the short-circuit protection mechanism 6 is a direct-acting electromagnetic mechanism, including a push rod driven by a tripping driven column 40 .

[0081] Preferably, Figure 1 、 2, 5, 9A show the first embodiment of the overload protection mechanism 2a, specifically as follows: the overload protection mechanism 2a includes a first conductive plate 20a, a second connecting plate 22a and a bimetallic strip 23a, the two ends of the first connecting plate 22a are connected to the first conductive plate 20a and the bimetallic strip 23a respectively; the bimetallic strip 23a is connected to the first conductive plate 20a through a first soft connection 240a, and is connected to the static contact 1-0a through a second soft connection 241a; the first conductive plate 20a and the static contact 1-0a are connected through a third soft connection 242a. Further, as Figure 9A As shown, one end of the first connecting plate 22a is connected to the middle of the first conductive plate 20a, and the other end is connected to one end of the bimetallic strip 23a. Figure 9A As shown, the first connecting plate 22a and the bimetallic strip 23a form a C-shaped structure, with the open side of the C-shaped structure facing the operating mechanism 4. The first conductive plate 20a and the static contact 1-0a are arranged on the other side of the C-shaped structure. Furthermore, one end of the first conductive plate 20a is connected to the external load via the second terminal 3a, and the other end is opposite to the static contact plate 1-00a of the static contact 1-0a.

[0082] Preferably, Figure 9A As shown, the overload protection mechanism 2a further includes an adjusting screw 21a, which is arranged on the first conductive plate 20a and is threadedly connected thereto, and one end of the adjusting screw 21a is matched with the first connecting plate 21a. Figure 1 As shown, the circuit breaker housing 2 further includes an operating hole 22 corresponding to the other end of the adjusting screw 21 a , and the user can screw the adjusting screw 21 a through the operating hole 22 to adjust the overload protection characteristics of the overload protection mechanism.

[0083] Preferably, Figure 1 、 2 As shown in Figure 9A, the first conductive plate 20 is a Z-shaped structure, including a first conductive plate connection portion connected to the second terminal 3a, a second conductive plate connection portion connected to the first connection plate 22a, and a third conductive plate connection portion connected to the static contact 1-0a via a third soft connection 242a; the two ends of the second conductive plate connection portion are respectively connected to the first conductive plate connection portion and the third conductive plate connection portion by bending, and the first conductive plate connection portion and the third conductive plate connection portion are respectively located on both sides of the second conductive plate connection portion. Figure 9A As shown, the adjusting screw 21a is arranged on the connecting portion of the second conductive plate and is threadedly connected thereto, and one end of the adjusting screw 21a is connected to the middle portion of the first connecting plate 22a.

[0084] Preferably, Figure 9A and 9BAs shown, the static contact 1-0a includes a static contact plate 1-00a and a static contact point 1-01a arranged at one end of the static contact plate 1-00a. The static contact plate 1-00a is connected to the bimetallic strip 23a through a second soft connection 241a, and the first conductive plate 20a and the static contact plate 1-00a are connected through a third soft connection 242a.

[0085] Specifically, such as Figure 1 and 2 In the direction shown, the overload protection mechanism 2a is assembled into the circuit breaker housing 2 and is driven and matched with the operating mechanism 4; the upper end of the first conductive plate 20a is connected to the external load through the second terminal 3a, and the lower end is opposite to the upper end of the static contact plate 1-00a of the static contact 1-0a, and the first conductive plate 20a and the static contact 1-00a are connected by a third soft connection 242a; the upper end of the first connecting plate 22a is connected to the middle part of the first conductive plate 20a, and the lower end is connected to the upper end of the bimetallic strip 23a, the adjusting screw 21a is arranged in the middle part of the first conductive plate 20a and is threadedly connected to it, and the right end of the adjusting screw 21a is opposite to the middle part of the first connecting plate 22a, and an operating hole 22 is provided on the circuit breaker housing 2, which is opposite to the left end of the adjusting screw 21a; the lower end of the bimetallic strip 23a is located on the lower side of the tripping activated column 40 of the operating mechanism 4 and is driven and matched therewith.

[0086] Preferably, Figure 9B , which is a second embodiment of the overload protection mechanism 2a, differs from the first embodiment in that no third soft connection 242a is provided between the first conductive plate 20a and the static contact 1 - 0a.

[0087] Preferably, Figure 1-2 As shown in 6-8, the short-circuit protection mechanism 6a of the miniature circuit breaker of the present invention is a snap-on electromagnetic mechanism. The following is an embodiment thereof: the short-circuit protection mechanism 6 includes a yoke 61, an armature 60, an armature tension spring 63 and a conductive plate 64. The conductive plate 64 is arranged in the middle of the yoke 61, one end of the armature 60 is rotatably arranged, the armature 60 and the yoke 61 are relatively matched, one end of the armature tension spring 63 is connected to the armature 60 and the other end is connected to the circuit breaker housing 2.

[0088] Preferably, Figure 1-2 As shown in 6-7, the included angle between the axis of the armature tension spring 63 and the axis of the armature 60 is an acute angle. Figure 7 As shown, when the armature 60 and the yoke 61 are attracted, the included angle between the axis of the armature tension spring 63 and the axis of the armature 60 is α, and 3°≤α≤30°.

[0089] Preferably, Figure 6 As shown, the armature 60 includes a plurality of spring holes, which are arranged side by side and spaced apart. From the first to the last spring hole, they are offset in the direction of the armature tension spring 63.

[0090] Preferably, Figure 1 、 2 As shown, when the short-circuit protection mechanism 6 is assembled into the circuit breaker housing 2 , the axis of the yoke 61 is parallel to the axial direction of the circuit breaker housing 2 (the length direction of the circuit breaker housing 2 ).

[0091] Preferably, Figure 8 As shown, it is an embodiment of the armature 60, the yoke 61, and the coordination of the armature 60 and the yoke 61. Specifically: the yoke 61 is a U-shaped structure, including a yoke base plate 612 and a pair of yoke arms 611, the two yoke arms 611 are respectively connected to the two ends of the yoke base plate 612 by bending, and each yoke arm 611 is provided with an armature slot 610 at one end, and the two armature slots 610 are located at the same end of the yoke 61; the armature 60 includes two armature support arms 600 arranged at one end thereof and spaced side by side, and a limiting square groove 6000 is provided at one end corner of each armature support arm 600, and the two limiting square grooves 6000 are respectively located at the two ends of the two armature support arms 600, and respectively cooperate with the two armature slots 610. Further, as Figure 8 As shown, the two armature support arms 600 are integrally formed into a convex structure, the narrower end of the convex structure is limited between the two yoke arms 611 , and the two shoulders of the convex structure are clamped in the two armature slots 610 .

[0092] Preferably, Figure 8 As shown, the armature 60 includes an opening 65 in the middle thereof, and three spring holes are provided on one side of the opening 65, namely a first spring hole 65-0, a second spring hole 65-1 and a third spring hole 65-2. The three spring holes are arranged in parallel and spaced apart along the length direction of the armature 60. Figure 8 As shown, one end of each of the spring hanging holes is connected to the opening 65, which facilitates the armature tension spring 63 to enter or move out of the spring hanging hole.

[0093] Specifically, such as Figure 1 and 2 As shown, after the short-circuit protection mechanism 6 is assembled to the circuit breaker housing 2, when it is driven and matched with the operating mechanism 4: the short-circuit protection mechanism 6 is arranged below the operating mechanism 4, and the driving link 5 is arranged between the operating mechanism 4 and the short-circuit protection mechanism 6, with the upper and lower ends respectively driving and matching with the tripping activated column 40 of the operating mechanism 4 and the armature 60 of the short-circuit protection mechanism 6; when the miniature circuit breaker is in a short-circuit fault, the armature 60 swings counterclockwise, driving the driving link 5 to swing clockwise, and the driving link 5 drives the tripping activated column 40 to rotate from the lower side. Further, as Figure 1 and 2 As shown, the driving connecting rod 5 includes a connecting rod body and a connecting rod shaft mounting portion arranged on one side of the middle portion of the connecting rod body.

[0094] Preferably, Figure 1 、 2 As shown in Figures 5, 11-13, the miniature circuit breaker of the present invention further includes a signal output component 8, the operation button 1 and the first terminal 7 are respectively arranged at both ends of the circuit breaker housing 2, the second terminal 3a and the operation button 1 are located at the same end of the circuit breaker housing 2, the signal output component 8 and the first terminal 7 are located at the same end of the circuit breaker housing 2, the signal output component 8 is located between the two first terminals 7 arranged side by side, and one of the two first terminals 7 is used to connect to the L pole of the power supply, and the other is used to connect to the N pole.

[0095] Preferably, Figure 11-13A As shown, it is a first embodiment of the signal output component 8. Specifically: the signal output component 8 includes a printed circuit board 80 and a first signal terminal 83, a second signal terminal 82, a contact terminal 81, a current limiting resistor 85, and a diode 84, which are respectively arranged on the printed circuit board 80 and electrically connected to the printed circuit board 80; the current limiting resistor 85 is connected in series between the first signal terminal 83 and the contact terminal 81, and the diode 84 is connected in series between the second signal terminal 82 and the contact terminal 81; the contact terminal 81 is used to be electrically connected to the output terminal, and the first signal terminal 83 and the second signal terminal 82 are used to output electrical signals. In this embodiment, the second terminal 3a serves as the output terminal, the first terminal 7 is connected to the moving contact 1-1a, and the contact terminal 81 is connected to the static contact 1-0a. Further, as Figure 1 and 3 As shown, the miniature circuit breaker of the present invention further includes an arc-strike plate 4a disposed on one side of the arc-extinguishing chamber 9. One end of the arc-strike plate 4a is connected to the static contact 1-0a, and the other end is connected to the contact terminal 81. It should be noted that the connection between the first signal terminal 83, the current-limiting resistor 85, and the contact terminal 81, and the connection between the second signal terminal 82, the diode 84, and the contact terminal 81 are all implemented through the printed circuit board 80. This is a conventional technical means used by those skilled in the art and will not be further described here.

[0096] Preferably, Figure 13A As shown, the anode of the diode 84 is connected to the contact terminal 81 , and the cathode is connected to the second signal terminal 82 .

[0097] Preferably, Figure 11-12 As shown, the first signal terminal 83 and the second signal terminal 82 are arranged side by side and spaced apart on one side of the printed circuit board 80 (the front and back sides), and the contact terminal 81, the current limiting resistor 85 and the diode 84 are arranged on the other side of the printed circuit board 80 (the opposite side or the front side).

[0098] Preferably, Figure 11-12As shown, the first signal terminal 83, the second signal terminal 82 and the contact terminal 81 are all plug-in terminals. Figure 11-12 As shown, the first signal terminal 83, the second signal terminal 82 and the contact terminal 81 have the same structure, including a terminal base and two oppositely arranged terminal clamps, the two terminal clamps are respectively connected to the two ends of the terminal base by bending, and the middle parts of the two terminal clamps are convex towards each other, forming an X-shaped structure as a whole. Figure 11-12 As shown, the direction in which the wire or the conductive plate is inserted into the first signal terminal 83 and the second signal terminal 82 is perpendicular to the direction in which the wire or the conductive plate is inserted into the contact terminal 81 .

[0099] Preferably, Figure 1-4 As shown, when the signal output assembly 8 is assembled to the circuit breaker housing 2, the printed circuit board 80 is inserted vertically into the circuit breaker housing 2 along the thickness direction of the circuit breaker, and the printed circuit board 80 is perpendicular to the axial direction of the circuit breaker housing 2 (the length direction of the circuit breaker housing 2). Furthermore, the first signal terminal 83 and the second signal terminal 82 are arranged side by side, and the insertion direction of the first signal terminal 83 and the second signal terminal 82 is parallel to the length direction of the circuit breaker housing 2; the insertion direction of the contact terminal 81 is perpendicular to (or can be parallel to) the insertion direction of the first signal terminal 83 and the second signal terminal 82, and the insertion direction of the printed circuit board 80 is the same as the insertion direction of the printed circuit board 80. The printed circuit board 80 is perpendicular to the length direction of the circuit breaker housing 2, so that the printed circuit board 80 can be inserted into the arc striker 4a at the same time as the printed circuit board 80 is installed.

[0100] Further, such as Figure 3-4 As shown, the circuit breaker housing 2 includes a signal output component mounting structure, and the signal output component mounting structure is located between the two first terminals 7. Specifically: the signal output component mounting structure includes a pair of circuit board slots 2-80, a first component assembly space 2-81 and a second component assembly space that are relatively spaced apart. The two ends of the printed circuit board 80 are respectively inserted into the two circuit board slots 2-80, and the first component assembly space 1-81 and the second component assembly space are respectively located on both sides of the printed circuit board 80; the contact terminal 81, the current limiting resistor 85 and the diode 84 are all located in the first component assembly space 2-81, the first signal terminal 83 and the second signal terminal 82 are both located in the second component assembly space, and the end of the arc-starting plate 4a that cooperates with the contact terminal 81 extends into the first component assembly space 2-81. Further, as Figure 4 As shown, each of the insertion ports of the circuit board slots 2-80 is provided with an introduction slope to facilitate the insertion of the printed circuit board 80. The inner end of the circuit board slot 2-80 is provided with a positioning rib 2-800. The printed circuit board 80 is inserted into the circuit board slot 2-80 until it abuts against the positioning rib 2-800 to ensure that the printed circuit board 80 is installed in place. Figure 4 As shown, the second component assembly space includes two terminal assembly cavities arranged side by side, a terminal partition rib 82-83 is provided between the two terminal assembly cavities, a plurality of terminal support ribs 2-820 are provided at the bottom of each terminal assembly cavity, and each terminal assembly cavity is relatively matched with a signal socket 2-82 provided on the circuit breaker housing 2.

[0101] Preferably, Figure 13B As shown, this is a second embodiment of the signal output component 8, which differs from the first embodiment in that: the second signal terminal 82 is connected to the contact terminal 81 through a series-connected diode 84, a current-limiting resistor 85, and the first signal terminal 81 is connected to the contact terminal 81 through a current-limiting resistor 85 (the first signal terminal 81 is connected to the node between the current-limiting resistor 85 and the contact terminal 81).

[0102] Preferably, Figure 14-29 As shown, the miniature circuit breaker of the present invention further includes a PCB board 7 and a conductive structure. The PCB board 7 is arranged in the circuit breaker housing 2 and includes a signal light 8a. The conductive structure includes a light guide element 5a and an observation hole. One end of the light guide element 5a is opposite to the signal light 8a, and the other end is opposite to the observation hole. Figure 15 、 16 As shown in , 19, 20, 24, 25, 27-29, the light guide element 5a includes at least one reflecting surface for reflecting the light emitted by the signal lamp 8a, and the light emitted by the signal lamp 8a reaches the observation hole after at least one reflection. Figure 15 、 16 As shown in , 19, 20, 24, 25, 27-29, after the light emitted by the signal lamp 8a enters the light guide element 5a, it is reflected 2n+1 times and then emitted from the light guide element 5a, where n is a natural number, and n is preferably 1 or 3.

[0103] Preferably, Figure 15 、 16 As shown in , 19, 20, 24, 25, 27-29, the direction in which the light emitted by the signal lamp 8a enters the light-guiding element 5a is the first direction, and the direction in which the light emitted by the signal lamp 8a exits the light-guiding element 5a is the second direction. The first direction is perpendicular to the second direction, and the first direction is perpendicular to the axial direction of the light-guiding element 5a.

[0104] Preferably, the light guide element 5a is a total reflection light guide element, which can transmit most of the light emitted by the signal lamp 8a into the observation hole.

[0105] Preferably, Figure 14-25As shown in FIG. 1 , it is a first embodiment of the conductive structure. Specifically, the observation hole includes a button observation hole 101 provided on the operation button 1. The light guide element 5a is linked to the operation button 1, with one end corresponding to the signal light 8a and the other end corresponding to the button observation hole 101. Figure 15 、 19 As shown in Figures 24 and 25, the operating button 1 includes a first assembly cavity 100 arranged in the middle thereof and extending axially along the operating button 1, the light guide element 5a is arranged in the first assembly cavity 100, and the button observation hole 101 is arranged at one end of the operating button 1 and communicates with the first assembly cavity 100.

[0106] Preferably, Figure 16 and 20 As shown, it is a first embodiment of the light-guiding element 5a. Specifically: the light-guiding element 5a includes a light-guiding element body 5-0a and a first reflecting surface 51a, a second reflecting surface 52a, a third reflecting surface 53a, and a fourth reflecting surface 54a arranged on the light-guiding element body 5-0a; the first reflecting surface 51a, the second reflecting surface 52a, the third reflecting surface 53a, and the fourth reflecting surface 54a are all inclined surfaces, and are all inclined in the same direction; the first reflecting surface 51a, the second reflecting surface 52a, and the third reflecting surface 53a are all arranged on one side of the light-guiding element body 5-0a and are arranged in sequence along the axial direction of the light-guiding element body 5-0a, and the first reflecting surface 51a, the second reflecting surface 52a, and the third reflecting surface 53a are offset to one side of the light-guiding element 5a in sequence; the fourth reflecting surface 54a is arranged on the other side of the light-guiding element body 5-0a, and the third reflecting surface 53a and the fourth reflecting surface 54a are arranged at the same end of the light-guiding element body 5-0a. Further, as Figure 15 and 16 As shown, the miniature circuit breaker of the present invention is in the off state. The light emitted by the signal lamp 8a enters the light guide element body 5-0a from one end thereof, is reflected by the first reflection surface 51a, the fourth reflection surface 54a and the third emission surface 53a in sequence, and is emitted from the other end of the light guide element body 5-0a and is visible through the button observation hole 101. Figure 19 and 20 As shown, the miniature circuit breaker of the present invention is in the closed state, the operating button 1 drives the light guide element 5a to move downward, and the signal light 8a is emitted from one end of the light guide element main body 5-0a into the light guide element main body 5-0a, and is reflected by the second reflecting surface 52a, the fourth reflecting surface 54a and the third reflecting surface 53a in sequence, and then emitted from the other end of the light guide element 5-0a and is visible through the button observation hole 101.

[0107] Specifically, such as Figure 15-16, 19-20, 24-25, the signal light 8a is arranged on the left side of the lower end of the light guide element 5a, and the upper end of the light guide element 5a is matched with the button observation hole 101; Figure 19 and 24 As shown, when the operating button 1 is pressed to close the miniature circuit breaker, the light guide element 5a moves downward along with the operating button 1, so that the second emitting surface 52a is opposite to the signal light 8a; Figure 15 and 25 As shown, when the operating button 1 is pulled to open the miniature circuit breaker, the light guide element 5a moves upward with the operating button 1, so that the first reflective surface 51a and the signal light 8a are aligned; the light emitted by the signal light 8a always enters the light guide element 5a from a direction perpendicular to the axial direction of the light guide element 5a and is emitted from a direction parallel to the axial direction of the light guide element 5a.

[0108] Preferably, Figure 15 、 17 As shown in Figures 19, 21, and 22, the miniature circuit breaker of the present invention further includes an indicator 6a disposed in the first assembly cavity 100 for indicating the opening / closing state of the miniature circuit breaker. The indicator 6a is linked to the operating button 1. The indicator 6a includes a translucent indicator portion 61-62a. The indicator portion 61-62a includes an opening indicator surface 61a and a closing indicator surface 62a disposed side by side. The indicator portion 61-62a is disposed between the light guide element 5a and the button observation hole 101. When the miniature circuit breaker is in the closing state, the closing indicator surface 62a is visible through the button observation hole 101. When the miniature circuit breaker is in the opening state, the opening indicator surface 61a is visible through the button observation hole 101. Further, as Figure 17 、 18 As shown in Figures 21 and 22, the miniature circuit breaker of the present invention further includes a driving member 9a disposed in the circuit breaker housing 1, and the driving member 9a includes an indicator driving platform 90a; the indicator 6a further includes an indicator shaft 60a and an indicator actuated portion 63a, the indicator shaft 60a and the indicating portions 61-62a are respectively located at both ends of the indicator 6a, the indicator actuated portion 63a is connected to the indicator shaft 60a, the indicator 6a is rotatably arranged via the indicator shaft 60a, and the indicator driving platform 90a drives the indicator 6a to rotate via the indicator actuated portion 63a. Further, the indicator 6a is rotatably connected to the operating button 1 via the indicator shaft 60a, or the indicator 6a is rotatably connected to the light guide element 5a via the indicator shaft 60a. Further, as Figure 15 、 17 -19, 21-22, the light guide element 5a includes an indicator mounting shaft groove 50a, the indicator shaft mounting groove 50a is arranged between the second reflecting surface 52a and the third reflecting surface 53a, and is located on the same side of the light guide element 5a as the second reflecting surface 52a and the third reflecting surface 53a, and the indicator shaft 60a is rotatably arranged in the indicator shaft mounting groove 50a.

[0109] Preferably, Figure 17-18 As shown in Figures 21-22 and 23, the indicator actuated portion 63a is a C-shaped structure, including a closing drive portion 630a and an opening drive portion 631a respectively arranged at both ends thereof. The middle portion of the indicator actuated portion 63a is connected to the indicator shaft 60a. The indicator driving platform 90a is located in the middle portion of the C-shaped structure of the indicator actuated portion 63a, and is driven and cooperated with the closing drive portion 630a and the opening drive portion 631a respectively. The indicator driving platform 90a pushes the closing drive portion 630 to rotate the indicator 6a, and the closing indication surface 62a is visible through the button indication hole 101. The indicator driving platform 90a pushes the opening drive portion 631a to rotate the indicator 6a, and the opening indication surface 61a is visible through the button indication hole 101. The indicator driving platform 90a and the indicator driven portion 63a are mechanically driven and cooperated, and the operation is reliable and stable. In addition, the indicator 6a switches the closing indication surface 62a and the opening indication surface 61a by swinging, and the movement amplitude is large, ensuring that the opening / closing state of the miniature circuit breaker is reliably and accurately indicated, thereby improving the user's power safety.

[0110] Preferably, Figure 23 As shown, it is an embodiment of the indicator 6a. Specifically, the indicator 6a includes an indicator portion 61-62a, an indicator connecting portion 64a, an indicator shaft 60a and an indicator actuated portion 63a. The indicator portions 61-62a and the indicator shaft 60a are respectively connected to the indicator connecting portion 64a. One end of the indicator shaft 60a is connected to the indicator connecting portion 64a, and the other end is connected to the indicator actuated portion 63a. The indicator portion 61-62a includes a closing indicator surface 62a and an opening indicator surface 61a arranged side by side. Both ends of the opening indicator surface 61a are respectively connected to the indicator connecting portion 64a and the closing indicator surface 62a. The indicator actuated portion 63a is a C-shaped structure, the middle part of which is connected to the indicator shaft 60a, and includes a closing drive portion 630a and an opening drive portion 631a respectively arranged at both ends. Further, as Figure 23 As shown, the indicator connecting portion 64a is an L-shaped structure, and the indicator connecting portion 64a and the indicator portion 61-62a form a U-shaped structure as a whole. The opening direction of the U-shaped structure is the same as the opening direction of the C-shaped structure of the indicator actuated portion 63a, and the closing drive portion 630a is arranged close to the indicator portion 61-62.

[0111] Preferably, Figures 26-29 FIG. 2 shows a second embodiment of the conductive structure, which differs from the first embodiment in that the observation hole includes a housing observation hole 21 provided on the circuit breaker housing 2, and the light guide element 5a is fixedly provided in the circuit breaker housing 2, with one end thereof corresponding to the signal lamp 8a and the other end corresponding to the housing observation hole 21 or inserted in the housing observation hole 21.

[0112] Preferably, Figure 26 、 27 As shown in FIG29 , the circuit breaker housing 1 includes a circuit breaker operation interface 20 provided at one end thereof, a housing observation hole 21 is provided on the circuit breaker operation interface 20, one end of the operation button 1 is inserted into the circuit breaker housing 2, and the other end protrudes outside the circuit breaker operation interface 20. Further, as Figure 26 and 27 As shown, the miniature circuit breaker of the present invention further includes a first wiring hole 203 and a first wiring removal hole 2030 provided on the circuit breaker operation interface 20. The first wiring hole 203 and the first wiring removal hole 2030 are matched one-to-one, and the first wiring hole 203 is matched one-to-one with the first wiring terminal 3a.

[0113] like Figures 27-28 The figure shows a second embodiment of the light-guiding element 5a. Specifically, the light-guiding element 5a includes a first reflecting surface 51a arranged at one end thereof, and the indicator light 8a is arranged on one side of the light-guiding element 5a. After the emitted light enters the light-guiding element 5a, it is reflected by the first reflecting surface 51a, and then exits the light-guiding element 5a and is visible through the observation hole 21 of the outer shell.

[0114] like Figure 29 and 30 The figure shows a third embodiment of the light guide element 5a. Specifically, the light guide element 5a includes a first reflecting surface 51a, a second emitting surface 52a and a third reflecting surface 53a. The first reflecting surface 51a, the second emitting surface 52a and the third reflecting surface 53a are all inclined surfaces inclined in the same direction and parallel to each other. The first reflecting surface 51a and the third reflecting surface 53a are arranged on the same side of the light guide element 5a and are offset sequentially toward one side of the light guide element 5a. The first reflecting surface 51a and the third reflecting surface 53a are respectively arranged at two ends of the light guide element 5a. The second reflecting surface 52a is arranged on the other side of the light guide element 51a, opposite to the third reflecting surface 53a. The second reflecting surface 52a and the third reflecting surface 53a are located at the same end of the light guide element 5a. The indicator light 8a is arranged on one side of the light guide element 5a. After the emitted light enters the light guide element 5a, it is reflected by the first reflecting surface 51a, the second reflecting surface 52a and the third reflecting surface 53a in sequence, and then exits the light guide element 5a and is visible through the observation hole 21 of the housing.

[0115] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A miniature circuit breaker, comprising a circuit breaker housing (2), an operating button (1), and an operating mechanism (4), an overload protection mechanism (2a), and a short-circuit protection mechanism (6) respectively arranged in the circuit breaker housing (2); the operating button (1) is arranged at one end of the circuit breaker housing (2), and operating the operating button (1) causes the miniature circuit breaker to be closed / opened via the operating mechanism (4); the short-circuit protection mechanism (6) is driven and matched with the operating mechanism (4); the operating mechanism (4) comprises a rotating plate (43) rotatably arranged on the circuit breaker housing (2), and a locking member (41) and a tripping member (42) respectively rotatably arranged on the rotating plate (43) and locked in a locked manner; the characteristics are: The short-circuit protection mechanism (6) is a snap-on electromagnetic mechanism, and the operating button (1) and the short-circuit protection mechanism (6) are opposite to each other and are respectively arranged on both sides of the operating mechanism (4); The jumper (42) comprises a jumper actuated column (40); the overload protection mechanism (2a) and the short-circuit protection mechanism (6) are respectively driven and matched with the jumper actuated column (40), driving the jumper (42) to rotate and releasing the locking match with the locking member (41); the middle part of the jumper actuated column (40) is connected to the jumper (42), one end of which is driven and matched with the overload protection mechanism (2a), and the other end of which is driven and matched with the short-circuit protection mechanism (6).

2. The miniature circuit breaker according to claim 1, characterized in that: The short-circuit protection mechanism (6) comprises a magnetic yoke (61), an armature (60), an armature tension spring (63) and a conductive plate (64); the conductive plate (64) is arranged in the middle of the magnetic yoke (61); one end of the armature (60) is rotatably arranged; the armature (60) and the magnetic yoke (61) are relatively matched; one end of the armature tension spring (63) is connected to the armature (60) and the other end is connected to the circuit breaker housing (2); the angle between the axis of the armature tension spring (63) and the axis of the armature (60) is an acute angle.

3. The miniature circuit breaker according to claim 2, characterized in that: When the armature (60) and the magnetic yoke (61) are attracted, the angle between the axis of the armature tension spring (63) and the axis of the armature (60) is α, and 3°≤α≤30°.

4. The miniature circuit breaker according to claim 2, characterized in that: The armature (60) comprises a plurality of spring hanging holes, which are arranged side by side at intervals and are offset in the direction of the armature tension spring (63) from the first to the last spring hanging hole.

5. The miniature circuit breaker according to claim 2, characterized in that: The axis of the magnetic yoke (61) is parallel to the axial direction of the circuit breaker housing (2).

6. The miniature circuit breaker according to any one of claims 1 to 5, characterized in that: The operating mechanism (4) further comprises a handle member (44) and a second connecting rod (45); the handle member (44) is rotatably mounted on the circuit breaker housing (2); the locking member (41) and the tripping member (42) are rotatably mounted on the rotating plate (43); the handle member (44) is connected to the locking member (41) via the second connecting rod (45); and the operating button (1) is drivably connected to the handle member (44) to drive the handle member (44) to rotate.

7. The miniature circuit breaker according to claim 6, characterized in that: The miniature circuit breaker further comprises a driving link (5) rotatably arranged on the circuit breaker housing (2), wherein both ends of the driving link (5) are respectively driven and matched with the tripping driven column (40) and the armature (60) of the short-circuit protection mechanism (6).

8. The miniature circuit breaker according to claim 2, characterized in that: The magnetic yoke (61) is a U-shaped structure, comprising a magnetic yoke bottom plate (612) and a pair of magnetic yoke arms (611), the two magnetic yoke arms (611) being respectively connected to the two ends of the magnetic yoke bottom plate (612) by bending, and each magnetic yoke arm (611) is provided with an armature clamping groove (610) at one end, and the two armature clamping grooves (610) are located at the same end of the magnetic yoke (61); The armature (60) comprises two armature support arms (600) arranged at one end thereof and spaced side by side. A limiting square groove (6000) is provided at an end corner of each armature support arm (600). The two limiting square grooves (6000) are respectively located at the two ends of the two armature support arms (600) and respectively cooperate with the two armature clamping grooves (610).

9. The miniature circuit breaker according to claim 2, characterized in that: The armature (60) includes an opening (65) arranged in the middle thereof, and three spring holes are arranged on one side of the opening (65), namely a first spring hole (65-0), a second spring hole (65-1) and a third spring hole (65-2). The three spring holes are arranged in sequence and spaced apart along the length direction of the armature (60).

10. The miniature circuit breaker according to claim 1, wherein: The overload protection mechanism (2a) and the short-circuit protection mechanism (6) are both driven from the lower side of the tripping latch actuated column (40); both ends of the tripping latch actuated column (40) are protruded toward both sides of the tripping latch (42) in the direction of the rotating shaft of the tripping latch (42).

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