Miniature Circuit Breaker

Abstract

The present invention relates to the field of low-voltage electrical appliances, and particularly relates to a miniature circuit breaker, which comprises a circuit breaker housing, an overload protection mechanism, a moving contact and a static contact used in cooperation, and an operating mechanism, all of which are disposed within the circuit breaker housing; the overload protection mechanism is drivingly cooperated with the operating mechanism, and the moving contact is drivingly connected to the operating mechanism; the overload protection mechanism includes a first conductive plate, a first connecting plate and a bimetal sheet, and two ends of the first connecting plate are respectively connected to the first conductive plate and the bimetal sheet; the bimetal sheet is connected to the first conductive plate through a first flexible connection and connected to the static contact through a second flexible connection; a third flexible connection is selectively disposed between the first conductive plate and the static contact; for the miniature circuit breaker of the present invention, its overload protection mechanism can be used for protecting overload currents of more specifications.

Description

Technical Field

[0001] The present invention relates to the field of low-voltage electrical appliances, and particularly 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 at present. However, the existing circuit breakers generally have the following problems:

[0003] First, the existing circuit breakers are generally installed in a distribution box. When a line fails and needs to be repaired or the failed circuit breaker needs to be replaced, the operator needs to check the circuit breakers installed on the line one by one, which is rather cumbersome; especially for plug-in circuit breakers, they are generally installed in a cabinet and there are a large number of them. When repairing, replacing a faulty circuit breaker, finding a specific circuit breaker or judging the state of the circuit breaker, it takes a lot of time and energy, affecting the efficiency of repair, search or judgment, and there are certain safety hazards.

[0004] Second, when used on some equipment with a narrow and specific space, there are defects such as inability to install or high installation cost.

[0005] Third, the signal output component of the circuit breaker can only output a single type of signal, which cannot meet the requirements; moreover, 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, the overload protection mechanism of which can be used for protecting more specifications of overload currents.

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

[0008] A miniature circuit breaker includes a circuit breaker housing 2, an overload protection mechanism 2a, a moving contact 1-1a and a static contact 1-0a which are used in cooperation, and an operating mechanism 4 respectively arranged in the circuit breaker housing 2; the overload protection mechanism 2a is drivingly cooperated with the operating mechanism 4, and the moving contact 1-1a is drivingly connected with the operating mechanism 4;

[0009] The overload protection mechanism 2a includes a first conductive plate 20a, a first connecting plate 22a and a bimetallic strip 23a. The two ends of the first connecting plate 22a are respectively connected with the first conductive plate 20a and the bimetallic strip 23a; the bimetallic strip 23a is connected with the first conductive plate 20a through a first flexible connection 240a and connected with the static contact 1-0a through a second flexible connection 241a; a third flexible connection 242a can be selectively arranged between the first conductive plate 20a and the static contact 1-0a.

[0010] Preferably, 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. One end of the adjusting screw 21a is in relative cooperation with the first connecting plate 22a.

[0011] Preferably, the circuit breaker housing 2 includes an operation hole 22 corresponding to the other end of the adjusting screw 21a; 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 bimetal 23a.

[0012] Preferably, 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 bimetal 23a through a second flexible connection 241a; A third flexible connection 242a can be selectively arranged between the first conductive plate 20a and the static contact plate 1-00a.

[0013] Preferably, the first connecting plate 22a and the bimetal 23a are integrally formed in a C-shaped structure, and the opening side of the C-shaped structure faces 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; One end of the first conductive plate 20a is connected to an external load through a second terminal 3a, and the other end is opposite to one end of the static contact plate 1-00a of the static contact 1-0a. The other end of the static contact plate 1-00a is provided with a static contact point 1-01a.

[0014] 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 are locked and cooperated. The handle member 44 is connected to the locking member 41 through the second connecting rod 45; The bimetal 23a is in driving cooperation with the tripping member 42.

[0015] Preferably, the tripping member 42 is in a V-shaped structure, and the middle part is rotatably arranged on the circuit breaker housing 2. One end is provided with a tripping receiving column 40 in driving cooperation with the bimetal 23a, and the other end is in locking cooperation with the locking member 41.

[0016] Preferably, the miniature circuit breaker further includes a short-circuit protection mechanism 6, and the short-circuit protection mechanism 6 is in driving cooperation with the tripping receiving column 40; The short-circuit protection mechanism 6 is a clapper-type electromagnetic mechanism or a direct-acting electromagnetic mechanism.

[0017] Preferably, the miniature circuit breaker further includes an operation button 1. One end of the operation button 1 is inserted into the circuit breaker housing 2 and is drivingly connected to the handle member of the operating mechanism 4 through a first connecting rod; Pressing / pulling the operation button 1 closes / opens the miniature circuit breaker through the operating mechanism 4.

[0018] For the miniature circuit breaker of the present invention, in its overload protection mechanism 2a, when it is for small current specifications (breaking small current), no third flexible connection 242a is provided between the first conductive plate 20a and the static contact 1-0a to meet the heating requirements of the bimetal 23a; for the overload protection mechanism 2a when it is for large current specifications, the first conductive plate 20a and the static contact 1-0a are connected by the third flexible connection 242a, which not only ensures the heating requirements of the bimetal 23a but also meets the requirements for the current-carrying cross-section of the flexible connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of the miniature circuit breaker of the present invention, and its short-circuit protection mechanism is a clapper-type electromagnetic mechanism;

[0020] Figure 2 It is a schematic structural diagram of the miniature circuit breaker of the present invention, compared with Figure 1 the partition is omitted;

[0021] Figure 3 It is of the present invention Figure 1 an enlarged structural diagram of part A;

[0022] Figure 4 It is of the present invention Figure 2 an enlarged structural diagram of part B;

[0023] Figure 5 It is a schematic structural diagram of the miniature circuit breaker of the present invention, and its short-circuit protection mechanism is a direct-acting electromagnetic mechanism;

[0024] Figure 6 It is a three-dimensional structural diagram of the short-circuit protection mechanism of the present invention, and this short-circuit protection mechanism is a clapper-type electromagnetic mechanism;

[0025] Figure 7 It is a side projection structural diagram of the short-circuit protection mechanism of the present invention, and this short-circuit protection mechanism is a clapper-type electromagnetic mechanism, showing at least the included angle between the armature and the armature tension spring when the armature is attracted to the yoke;

[0026] Figure 8 It is an exploded structural diagram of the short-circuit protection mechanism of the present invention, and this short-circuit protection mechanism is a clapper-type electromagnetic mechanism;

[0027] Figure 9A It is a schematic structural diagram of the first embodiment of the overload protection mechanism of the present invention, in which the bimetal is connected to the first conductive plate through the first flexible connection, connected to the static contact through the second flexible connection, and the first conductive plate and the static contact are connected through the third flexible connection;

[0028] Figure 9BIt is a schematic structural diagram of the second embodiment of the overload protection mechanism of the present invention. Its bimetallic strip is connected to the first conductive plate through the first flexible connection and to the static contact through the second flexible connection;

[0029] Figure 10 It is a schematic structural diagram of the partition of the present invention;

[0030] Figure 11 It is a schematic structural diagram of the signal output component of the present invention, showing at least the structure on one side of the printed circuit board;

[0031] Figure 12 It is a schematic structural diagram of the signal output component of the present invention, showing at least the structure on the other side of the printed circuit board;

[0032] Figure 13A It is a schematic circuit principle diagram of the first embodiment of the signal output component of the present invention;

[0033] Figure 13B It is a schematic circuit principle diagram of the second embodiment of the signal output component of the present invention;

[0034] Figure 14 It is a schematic structural diagram of the miniature circuit breaker of the present invention, showing at least the button observation hole;

[0035] Figure 15 It is a schematic structural diagram of the cooperation of the signal lamp, the light guide element, the indicating member and the operation button when the miniature circuit breaker of the present invention is in the open state;

[0036] Figure 16 It is a schematic structural diagram of the first embodiment of the light guide element of the present invention, showing the propagation path of the light emitted by the signal lamp in the light guide element when the miniature circuit breaker is in the open state;

[0037] Figure 17 It is a schematic structural diagram of the cooperation of the driving member and the indicating member when the miniature circuit breaker of the present invention is in the open state;

[0038] Figure 18 It is a schematic structural diagram of the cooperation of the driving member and the indicating member from another angle when the miniature circuit breaker of the present invention is in the open state;

[0039] Figure 19 It is a schematic structural diagram of the cooperation of the signal lamp, the light guide element, the indicating member and the operation button when the miniature circuit breaker of the present invention is in the closed state;

[0040] Figure 20 It is a schematic structural diagram of the first embodiment of the light guide element of the present invention, showing the propagation path of the light emitted by the signal lamp in the light guide element when the miniature circuit breaker is in the closed state;

[0041] Figure 21It is a schematic diagram of the cooperation structure between the driving member and the indicating member when the miniature circuit breaker of the present invention is in the closed state;

[0042] Figure 22 It is a schematic diagram of the cooperation structure between the driving member and the indicating member at another angle when the miniature circuit breaker of the present invention is in the closed state;

[0043] Figure 23 It is a schematic diagram of the structure of the indicating member of the present invention;

[0044] Figure 24 It is a schematic diagram of the cooperation structure of the signal lamp, the light guide element and the operation button when the miniature circuit breaker of the present invention is in the closed state;

[0045] Figure 25 It is a schematic diagram of the cooperation structure of the signal lamp, the light guide element and the operation button when the miniature circuit breaker of the present invention is in the open state;

[0046] Figure 26 It is a schematic diagram of the structure of the miniature circuit breaker of the present invention, showing at least the housing observation hole;

[0047] Figure 27 It is a schematic diagram of the cooperation structure of the signal lamp, the light guide element and the housing observation hole of the miniature circuit breaker of the present invention, and the light emitted by the signal lamp is emitted from the light guide element after one reflection;

[0048] Figure 28 It is a schematic diagram of the structure of the second embodiment of the light guide element of the present invention;

[0049] Figure 29 It is a schematic diagram of the cooperation structure of the signal lamp, the light guide element and the housing observation hole of the miniature circuit breaker of the present invention, and the light emitted by the signal lamp is emitted from the light guide element after three reflections;

[0050] Figure 30 It is a schematic diagram of the structure of the third embodiment of the light guide element of the present invention. Detailed implementation manners

[0051] The following Figures 1 - 30 Given embodiments are used to further illustrate the detailed implementation manners of the miniature circuit breaker of the present invention. The miniature circuit breaker of the present invention is not limited to the descriptions of the following embodiments.

[0052] Such as Figure 1 、 2As shown in FIGS. 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 movable contact 1-1a and a static contact 1-0a used in cooperation, an arc extinguishing chamber 9, an overload protection mechanism 2a, and a short-circuit protection mechanism 6 respectively disposed inside the circuit breaker housing 2; the operating button 1 is disposed 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 is slidably engaged with the circuit breaker housing 2; the operating button 1 is drivingly connected to the operating mechanism 4, and the operating mechanism 4 is drivingly connected to the movable contact 1-1a. By pressing / pulling the operating button 1, the movable contact 1-1a is driven by the operating mechanism 4 to be closed / open with the static contact 1-0a, so that the miniature circuit breaker is switched on / off; the overload protection mechanism 2a and the short-circuit protection mechanism 6 are respectively drivingly engaged with the operating mechanism 4. When an overload or short-circuit fault occurs in the miniature circuit breaker, the overload protection mechanism 2a or the short-circuit protection mechanism 6 drives the operating mechanism 4 to act, so that the miniature circuit breaker trips (or trips); the arc extinguishing chamber 9 is used to extinguish the arc generated when the movable contact 1-1a and the static contact 1-0a are closed or disconnected.

[0053] It should be noted that the arc extinguishing chamber 9, the overload protection mechanism 2a, and the short-circuit protection mechanism 6 can be provided or omitted according to actual needs, that is, one or more of the three can be not provided in the miniature circuit breaker. The miniature circuit breaker of the present invention preferably includes an arc extinguishing chamber 9, an overload protection mechanism 2a, and a short-circuit protection mechanism 6.

[0054] Preferably, as Figure 1 、 2 and 5 show, the internal layout of the miniature circuit breaker of the present invention has been 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. Further, as Figure 1 、 2 and 5 show, 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. Further, as Figure 1 、 2As shown in FIGS. 4 and 5, the miniature circuit breaker of the present invention further includes a first terminal 7 and a second terminal 3a respectively disposed 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 first terminal 7 and the second terminal 3a serve as the input terminal and the output terminal of the miniature circuit breaker respectively. One of the first terminal 7 and the second terminal 3a is connected to the static contact 1-0a, and the other is electrically connected to the moving contact 1-1a. The input terminal is connected to the power supply, and the output terminal is connected to an external load. In this embodiment, the first terminal 7 serves as the input terminal, the second terminal 3a serves as the output terminal, the first terminal 7 is connected to the moving contact 1-1a, and the second terminal 3a is electrically connected to the static contact 1-0a. According to needs, the second terminal 3a can also serve as the input terminal, and the first terminal 7 can serve as the output terminal; it is also possible that the first terminal 7 is electrically connected to the static contact 1-0a, and the second terminal 3a is connected to the moving contact 1-1a. The internal layout of the miniature circuit breaker of the present invention is carefully designed, the layout is more reasonable, and the internal space of the circuit breaker housing 2 is more fully utilized, making the entire miniature circuit breaker more compact, which is beneficial to reducing the overall specification of the miniature circuit breaker and conforming to the miniaturization development trend of the miniature circuit breaker.

[0055] Preferably, as Figures 1 - 5 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 power supply L pole, and the other is used to connect to the N pole.

[0056] Preferably, as Figure 13A and 13BAs shown, the signal output component 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 through the current-limiting resistor 85; the second signal terminal 82 is electrically connected to the output terminal through the diode 84; alternatively, the second signal terminal 82 is connected to the output terminal of the circuit breaker through the serially 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 moving contact 1-1a, the second terminal 3a is electrically connected to the static contact 1-0a, the first signal terminal 83 is electrically connected to the static contact 1-0a through the current-limiting resistor 85, and the second signal terminal 82 is electrically connected to the static contact 1-0a through the diode 84. For the signal output component 8, its current-limiting resistor 85 can increase the total resistance value of the load of the first signal terminal 83, thereby preventing the situation where the temporary large current generated during the closing / opening (closing / breaking of the moving contact 1-1a and the static contact 1-0a) of the miniature circuit breaker burns the signal terminal device; at the same time, the current-limiting resistor 85 also plays a voltage-dividing role to avoid the risk of electric shock when users or other personnel accidentally touch the second signal terminal 82; when the current-limiting resistor 85 is serially connected between the output terminal of the circuit breaker and the diode 84, it can reduce the voltage values at both the first signal terminal 82 and the second signal terminal 83. On the one hand, it reduces the risk of electric shock when users or other personnel accidentally touch, and on the other hand, it avoids the situation where the signal terminal devices connected to the first signal terminal 82 and the second signal terminal 83 are burned; the diode 84 can filter the signal output from the second signal terminal 82, convert the AC signal into a DC signal, so that the signal output component 8 can output AC and DC signals respectively to meet different requirements.

[0057] As Figures 1 - 3 shown in FIGS. 11-12, the signal output component 8 includes a printed circuit board 80 and a first signal terminal 83 and a second signal terminal 82 respectively disposed on the printed circuit board 80, and the printed circuit board 80 is inserted into the circuit breaker housing 2. Further, as Figures 11 - 12 shown, both the current-limiting resistor 85 and the diode 84 are disposed on the printed circuit board 80. Further, as Figures 11 - 12As shown, the signal output component 8 further includes a contact terminal 81 for electrically connecting to an output terminal. For example, the contact terminal 81 is connected to the static contact 1-0a, or the contact terminal 81 is connected to an arcing plate or a wiring board connected to the static contact 1-0a, or a wiring 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. Alternatively, 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 component 8, as an integral component, can be inserted on the circuit breaker housing 2 through the printed circuit board 80 to achieve 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 component 8, thereby significantly improving the installation and wiring efficiency of the signal output component 8 and facilitating user operation.

[0058] Preferably, as Figure 1 , 2 , 5 shows, the operating mechanism 4 includes a locking member 41 and a tripping member 42 that are locked and engaged. The tripping member 42 includes a tripping driven column 40 that is respectively drivingly engaged with the overload protection mechanism 2a and the short-circuit protection mechanism 6. Further, as Figure 1 , 2 , 5 shows, the overload protection mechanism 2a and the short-circuit protection mechanism 6 respectively push the tripping driven column 40 from the same side of the tripping driven column 40, causing the tripping member 42 to rotate and release the locking engagement with the locking member 41. Further, as Figure 1 and 2 shows, the middle of the tripping driven column 40 is connected to the tripping member 42, one end is drivingly engaged with the overload protection mechanism 2a, and the other end is drivingly engaged with 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 drivingly engaged with the tripping driven column 40, so that when an overload or short-circuit fault occurs in the miniature circuit breaker, the miniature circuit breaker trips. Compared with the existing miniature circuit breaker, the internal structure of the miniature circuit breaker is simplified, and the internal layout of the miniature circuit breaker is more compact.

[0059] Preferably, as Figures 1 - 2 , 6-8 shows, the short-circuit protection mechanism 6 is a clapper-type electromagnetic mechanism, including a yoke 61, an armature 60, an armature tension spring 63, and a conductive plate 64. The conductive plate 64 is disposed in the middle of the yoke 61. One end of the armature 60 is rotatably disposed, and the armature 60 is relatively engaged with the yoke 61. One end of the armature tension spring 63 is connected to the armature 60 and the other end is fixedly disposed. The included 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 to each other, the angle between the axis of the armature tension spring 63 and the axis of the armature 60 is α, where 3° ≤ α ≤ 30°. For the short-circuit protection mechanism 6, the angle between the axis of the armature tension spring 63 and the axis of the armature 60 is an acute angle, such that during the process of the armature 60 being attracted to the yoke 61, the increase in the elongation (or the increase in the tensile force) of the armature tension spring 63 is small, which is conducive to the rapid attraction of the armature 60 to the yoke 61, thereby improving the breaking capacity of the miniature circuit breaker. Further, as Figures 6 - 8 shown, the armature 60 includes a plurality of spring hanging holes, which are arranged side by side at intervals. From the first to the last spring hanging hole, they are sequentially offset in the direction of the armature tension spring 63, so that the short-circuit protection mechanism 6 can adjust the connection position between the armature tension spring 63 and the armature 60 (connected to the armature 60 through different spring hanging holes), realize the adjustment of the suction force and reaction force characteristics, and meet the requirements of the miniature circuit breaker for the protection characteristics.

[0060] It should be noted that, as Figure 5 shown, for the miniature circuit breaker of the present invention, the short-circuit protection mechanism 6 can also be a direct-acting electromagnetic mechanism; preferably, the short-circuit protection mechanism 6 of the miniature circuit breaker of the present invention adopts a clapper-type electromagnetic mechanism, so as to more conveniently adjust the suction force and reaction force characteristics.

[0061] Preferably, as Figures 1 - 2 shown in FIGS. 9A-9B, the overload protection mechanism 2a includes a first conductive plate 20a, a first connecting plate 22a, and a bimetal 23a. The two ends of the first connecting plate 22a are respectively connected to the first conductive plate 20a and the bimetal 23a; the bimetal 23a is connected to the first conductive plate 20a through a first flexible connection 240a and is connected to the static contact 1-0a through a second flexible connection 241a; a third flexible connection 242a can be selectively arranged between the first conductive plate 20a and the static contact 1-0a. For the overload protection mechanism 2a, when used for small current specifications (current values of 63A and below), the third flexible connection 242a is not arranged between the first conductive plate 20a and the static contact 1-0a to meet the heating requirements of the bimetal 23a; when used for large current specifications (current values above 63A), the first conductive plate 20a and the static contact 1-0a are connected through the third flexible connection 242a, which not only ensures the heating requirements of the bimetal 23a but also ensures the requirements for the current-carrying cross-section of the flexible connection. Further, as Figures 9A - 9BAs 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; the overload protection mechanism 2a further includes an adjusting screw 21a, which is arranged on the first conductive plate 20a and threadedly connected thereto, and one end of the adjusting screw 21a is in relative cooperation with the first connecting plate 21a. The adjusting screw 21a is arranged on the first conductive plate 20a. Compared with the prior art method of arranging the adjusting screw 21a on the circuit breaker housing 2, it avoids the situation where the position of the adjusting screw 21a changes due to the thermal deformation of the circuit breaker housing 2, resulting in the instability of the overload characteristics of the circuit breaker.

[0062] It should be noted 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, and has a certain elasticity, and can well withstand the acting force given by the adjusting screw 21a, so as to adjust the position of the bimetallic strip 23a to adjust the overload characteristics of the circuit breaker; the first flexible connection 240a, the second flexible connection 241a and the third flexible connection 242a are made of good conductors, have the characteristics of short length, large cross-section and small internal resistance, and form three current channels to carry most of the current.

[0063] Preferably, as Figures 14 - 29 shown, the miniature circuit breaker of the present invention further includes a PCB board 7a and a light guiding element 5a arranged in the circuit breaker housing 2, and an observation hole; the PCB board 7a is provided with a signal lamp 8a, one end of the light guiding element 5a is in relative cooperation with the signal lamp 8a, and the other end is in relative cooperation with the observation hole. In the miniature circuit breaker of the present invention, the light guiding element 5a can transmit the light emitted by the signal lamp 8a to the observation hole, which is convenient for users to observe the lighting state of the signal lamp 8a, so as to quickly prompt users when repairing, replacing a faulty miniature circuit breaker or finding a specific circuit breaker or judging the (open / closed / tripped) state of the circuit breaker, improve work efficiency, and ensure the personal safety of users.

[0064] It should be noted that the indicator lamp 8a can be set to indicate the open / closed state, fault state, etc. of the miniature circuit breaker as required, or make a specific indication according to the control command.

[0065] Preferably, as Figure 16 、 20 shown in FIGS. 28-29, the light guiding 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. Further, as Figure 16 、 20 shown in FIGS. 28-29, the direction in which the light of the signal lamp 8a enters the light guiding element 5a is the first direction, and the direction in which the light of the signal lamp 8a exits the light guiding element 5a is the second direction, and the first direction is perpendicular to the second direction. Preferably, as Figure 16 、20 As shown in FIGS. 28-29, the light guide element 5a includes 2n + 1 reflecting surfaces, where n is a natural number.

[0066] The following is an embodiment of the miniature circuit breaker of the present invention.

[0067] As Figure 1 、 2 、5 shows, the miniature circuit breaker of the present invention includes a circuit breaker housing 2, an operation button 1, and an operating mechanism 4, a movable contact 1-1a and a static contact 1-0a used in cooperation, 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 respectively arranged inside the circuit breaker housing 2; pressing / pulling the operation button 1 makes the miniature circuit breaker close / open through the operating mechanism 4.

[0068] Preferably, as Figure 1 、 2 、5 shows, the operation button 1 is arranged at one end of the circuit breaker housing 2, one end of the operation button 1 is inserted inside the circuit breaker housing 2 and is slidably matched 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 are 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 both sides of the operating mechanism 4, and the second terminal 3a and the arc extinguishing chamber 9 are opposite and are respectively located on both sides of the operating mechanism 4.

[0069] Preferably, the first terminal 7 is the incoming line terminal of the miniature circuit breaker, and the second terminal 3a is the outgoing line terminal of the miniature circuit breaker. Further, as Figure 1 and 2 shows, the miniature circuit breaker of the present invention is a two-phase miniature circuit breaker, and two first terminals 7 are arranged side by side at one end of the circuit breaker housing 2 at intervals, and two second terminals 3a are arranged side by side at the other end of the circuit breaker housing 2 at intervals.

[0070] Specifically, as Figure 1 、 2 、5 shows the direction, with Figure 1 、 2、For the upper, lower, left, right sides of 5 and the side facing the reader, they are the upper, lower, left, right sides and the front side of the miniature circuit breaker; the operating button 1 is arranged at the upper end of the circuit breaker housing 2, and the lower end of the operating button 1 is inserted into the circuit breaker housing 2 and is slidably matched 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 operating button 1 are arranged side by side left and right at the upper end of the circuit breaker housing 2; the overload protection mechanism 2a and the operating mechanism 4 are arranged in a front-back stacked manner 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 left and right and are located between the operating mechanism 4 and the first terminal 7; the operating 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.

[0071] Preferably, as Figure 1 and 10 shown, the miniature circuit breaker of the present invention further includes a partition 3. The circuit breaker housing 2 includes a housing base. The operating mechanism 4 is arranged between the partition 3 and the housing base, and the overload protection mechanism 2a, the operating mechanism 4 and the housing base are arranged in sequence. Further, the miniature circuit breaker of the present invention includes two second incoming terminals 3, which are respectively arranged on both sides of the partition 3.

[0072] Preferably, as Figure 1 、 2 、5 shown, it is an embodiment of the operating mechanism 4, 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 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 are in locking cooperation. The handle member 44 is drivingly connected to the locking member 41 through the second connecting rod 45, and the rotating plate 43 is drivingly connected to the static contact 1-0a; the operating button 1 is drivingly connected to the handle member 44 through the first connecting rod 46.

[0073] It should be noted that the structure of the operating mechanism 4 is not limited to the above one. Existing multi-link type operating mechanisms that achieve multi-link balance through the locking cooperation of at least two components can all be applied to the miniature circuit breaker of the present application.

[0074] Preferably, as Figure 1 、 2 、5 shown, the tripping member 42 includes a tripping receiving column 40 that is respectively drivingly matched with the overload protection mechanism 2a and the short-circuit protection mechanism 6. 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 receiving column 40 and releases the locking cooperation with the locking member 41, and the miniature circuit breaker trips. Further, as Figure 1 and2 As shown, the middle of the toggle receiving column 40 is connected to the toggle fastener 42. One end of the toggle receiving column 40 is in driving cooperation with the overload protection mechanism 2a, and the other end is in driving cooperation with the short - circuit protection mechanism 6. Further, as Figure 1 、 2 、5 shows, both the overload protection mechanism 2a and the short - circuit protection mechanism 6 are directly in driving cooperation with the toggle receiving column 40 from one side, and drive the toggle fastener 42 to rotate through the toggle receiving column 40 to release the locking cooperation with the locking fastener 41.

[0075] Specifically, as shown in the directions of Figure 1 and 2 , taking the upper, lower, left, right sides of Figure 1 、 2 and the side facing the reader as the upper, lower, left, right sides and the front side of the miniature circuit breaker; the front end of the toggle receiving column 40 is in driving cooperation with the overload protection mechanism 2a, and the rear end is in driving cooperation with the short - circuit protection mechanism 6; both the overload protection mechanism 2a and the short - circuit protection mechanism 6 are in driving cooperation with the toggle receiving column 40 from the lower side.

[0076] Preferably, as shown in Figure 1 、 2 、5, the overload protection mechanism 2a includes a bimetallic strip 23a that is in driving cooperation with the toggle receiving column 40.

[0077] Preferably, as shown in Figure 1 、 2 , the short - circuit protection mechanism 6 is a clapper - type electromagnetic mechanism, including an armature 60 that is in driving cooperation with the toggle receiving column 40. Further, as shown in Figure 1 and 2 , the miniature circuit breaker of the present invention further includes a driving link 5. The middle of the driving link 5 is rotatably arranged on the circuit breaker housing 2, and the two ends are respectively in driving cooperation with the armature 60 and the toggle receiving column 40.

[0078] Preferably, as shown in Figure 5 , the short - circuit protection mechanism 6 is a direct - acting electromagnetic mechanism, including a push rod that is in driving cooperation with the toggle receiving column 40.

[0079] Preferably, as shown in Figure 1 、 2, as shown in FIGS. 5 and 9A, the first embodiment of the overload protection mechanism 2a is as follows: The overload protection mechanism 2a includes a first conductive plate 20a, a second connection plate 22a, and a bimetal sheet 23a. Both ends of the first connection plate 22a are respectively connected to the first conductive plate 20a and the bimetal sheet 23a; the bimetal sheet 23a is connected to the first conductive plate 20a through a first flexible connection 240a and is connected to the stationary contact 1-0a through a second flexible connection 241a; the first conductive plate 20a and the stationary contact 1-0a are connected through a third flexible connection 242a. Further, as Figure 9A shown, one end of the first connection plate 22a is connected to the middle of the first conductive plate 20a, and the other end is connected to one end of the bimetal sheet 23a. Further, as Figure 9A shown, the first connection plate 22a and the bimetal sheet 23a are integrally formed in a C-shaped structure, and the opening side of the C-shaped structure faces the operating mechanism 4. The first conductive plate 20a and the stationary contact 1-0a are arranged on the other side of the C-shaped structure. Further, one end of the first conductive plate 20a is connected to an external load through a second terminal 3a, and the other end is opposite to one end of the stationary contact plate 1-00a of the stationary contact 1-0a.

[0080] Preferably, as Figure 9A shown, the overload protection mechanism 2a further includes an adjusting screw 21a. The adjusting screw 21a is arranged on the first conductive plate 20a and is threadedly connected thereto. One end of the adjusting screw 21a is in relative cooperation with the first connection plate 21a. Further, as Figure 1 shown, the circuit breaker housing 2 further includes an operation hole 22 corresponding to the other end of the adjusting screw 21a. The user can screw the adjusting screw 21a through the operation hole 22 to adjust the overload protection characteristics of the overload protection mechanism.

[0081] Preferably, as Figure 1 、 2 、9A shown, the first conductive plate 20 is in 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 stationary contact 1-0a through a third flexible connection 242a; both ends of the second conductive plate connection portion are bent and connected to the first conductive plate connection portion and the third conductive plate connection portion respectively. 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. As Figure 9A shown, the adjusting screw 21a is arranged on the second conductive plate connection portion and is threadedly connected thereto. One end of the adjusting screw 21a is connected to the middle of the first connection plate 22a.

[0082] Preferably, as Figure 9A and 9BAs shown, the static contact 1-0a includes a static contact plate 1-00a and a static contact point 1-01a provided at one end of the static contact plate 1-00a. The static contact plate 1-00a is connected to the bimetal 23a through a second flexible connection 241a, and the first conductive plate 20a and the static contact plate 1-00a are connected through a third flexible connection 242a.

[0083] Specifically, as Figure 1 and 2 shown in the direction, the overload protection mechanism 2a is assembled into the circuit breaker housing 2 and is in driving cooperation with the operating mechanism 4; the upper end of the first conductive plate 20a is connected to an external load through a 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. The first conductive plate 20a and the static contact 1-00a are connected through a third flexible connection 242a; the upper end of the first connecting plate 22a is connected to the middle of the first conductive plate 20a, and the lower end is connected to the upper end of the bimetal 23a. The adjusting screw 21a is arranged in the middle of the first conductive plate 20a and is threadedly connected thereto, and the right end of the adjusting screw 21a is in relative cooperation with the middle of the first connecting plate 22a. There is an operating hole 22 on the circuit breaker housing 2, which is in relative cooperation with the left end of the adjusting screw 21a; the lower end of the bimetal 23a is located below the trip latch actuating column 40 of the operating mechanism 4 and is in driving cooperation therewith.

[0084] Preferably, as Figure 9B shown, it is the second embodiment of the overload protection mechanism 2a. The difference from the first embodiment is that: no third flexible connection 242a is provided between the first conductive plate 20a and the static contact 1-0a.

[0085] Preferably, as Figures 1 - 2 shown in FIGS. 6-8, for the miniature circuit breaker of the present invention, its short-circuit protection mechanism 6a is a clapper-type 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, and the armature 60 is in relative cooperation with the yoke 61. 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.

[0086] Preferably, as Figures 1 - 2 shown in FIGS. 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. Further, as Figure 7 shown, when the armature 60 is attracted to the yoke 61, 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°.

[0087] Preferably, as Figure 6 shown, the armature 60 includes a plurality of spring hanging holes, and the plurality of spring hanging holes are arranged side by side at intervals and are offset in the direction of the armature tension spring 63 in sequence from the first to the last spring hanging hole.

[0088] Preferably, as Figure 1 , 2 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).

[0089] Preferably, as Figure 8 shown, it is an implementation manner of the cooperation between the armature 60, the yoke 61, the armature 60 and the yoke 61. Specifically: 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 bent and connected to both ends of the yoke bottom plate 612. 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; the armature 60 includes two armature support arms 600 arranged side by side and spaced apart at one end thereof. 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 both ends of the two armature support arms 600 and are respectively matched with the two armature slots 610. Further, as Figure 8 shown, the two armature support arms 600 are integrally in a convex - shaped structure. The narrower end of the convex - shaped structure is limited between the two yoke arms 611, and the two shoulders of the convex - shaped structure are clamped in the two armature slots 610.

[0090] Preferably, as Figure 8 shown, the armature 60 includes an opening 65 provided in the middle thereof. Three hanging spring holes are provided on one side of the opening 65, namely a first hanging spring hole 65 - 0, a second hanging spring hole 65 - 1 and a third hanging spring hole 65 - 2. The three hanging spring holes are arranged side by side and spaced apart in sequence along the length direction of the armature 60. Further, as Figure 8 shown, one end of each hanging spring hole communicates with the opening 65, facilitating the entry or exit of the armature pull spring 63 into or out of the hanging spring hole.

[0091] Specifically, as Figure 1 and 2 shown, after the short - circuit protection mechanism 6 is assembled into the circuit - breaker housing 2 and is in driving cooperation with the operating mechanism 4: the short - circuit protection mechanism 6 is arranged below the operating mechanism 4, the driving link 5 is arranged between the operating mechanism 4 and the short - circuit protection mechanism 6, and the upper and lower ends are respectively in driving cooperation with the trip catch receiving 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 counter - clockwise, the driving link 5 swings clockwise, and the driving link 5 drives the rotation of the trip catch receiving column 40 from the lower side thereof. Further, as Figure 1 and 2 shown, the driving link 5 includes a link body and a link shaft mounting portion provided on one side of the middle of the link body.

[0092] Preferably, as shown in Figure 1 , 2 , 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 two 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 two first terminals 7 arranged side by side at intervals. One of the two first terminals 7 is used to connect to the power supply L pole, and the other is used to connect to the N pole.

[0093] Preferably, as shown in Figures 11 - 13A , Figure 11, which is the 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 are 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. 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 shown in Figure 1 and 3 , Figures 12 and 13, the miniature circuit breaker of the present invention further includes an arc - guiding plate 4a arranged on one side of the arc - extinguishing chamber 9. One end of the arc - guiding 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 of the first signal terminal 83, the current limiting resistor 85 and the contact terminal 81, and the connection of the second signal terminal 82, the diode 84 and the contact terminal 81 are all realized through the printed circuit board 80, which are conventional technical means for those skilled in the art and will not be elaborated here.

[0094] Preferably, as shown in Figure 13A , Figure 12, the anode of the diode 84 is connected to the contact terminal 81, and the cathode is connected to the second signal terminal 82.

[0095] Preferably, as shown in Figures 11 - 12 , Figure 13, the first signal terminal 83 and the second signal terminal 82 are arranged side by side at intervals on one side (either the front side or the back side) of the printed circuit board 80, and the contact terminal 81, the current limiting resistor 85 and the diode 84 are arranged on the other side (the opposite side or the front side) of the printed circuit board 80.

[0096] Preferably, as shown in Figures 11 - 12As shown, the first signal terminal 83, the second signal terminal 82, and the contact terminal 81 are all plug-in type terminals. Further, as Figures 11 - 12 shown, the first signal terminal 83, the second signal terminal 82, and the contact terminal 81 have the same structure, and each includes a terminal base plate and two relatively arranged terminal clamping plates. The two terminal clamping plates are bent and connected to both ends of the terminal base plate respectively, and the middle parts of the two terminal clamping plates bulge towards each other, forming an X-shaped structure as a whole. Further, as Figures 11 - 12 shown, the direction in which the wire or 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 conductive plate is inserted into the contact terminal 81.

[0097] Preferably, as Figures 1 - 4 shown, when the signal output assembly 8 is assembled to the circuit breaker housing 2, the printed circuit board 80 is vertically inserted onto 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 (the length direction of the circuit breaker housing 2) of the circuit breaker housing 2. Further, the first signal terminal 83 and the second signal terminal 82 are arranged side by side, and the insertion directions of the first signal terminal 83 and the second signal terminal 82 are parallel to the length direction of the circuit breaker housing 2; the insertion direction of the contact terminal 81 is perpendicular to (or can also be parallel to) the insertion directions 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, and the printed circuit board 80 is perpendicular to the length direction of the circuit breaker housing 2, so that the printed circuit board 80 is inserted into the arc extinguishing plate 4a while the printed circuit board 80 is installed.

[0098] Further, as Figures 3 - 4 shown, the circuit breaker housing 2 includes a signal output assembly installation structure, and the signal output assembly installation structure is located between the two first connection terminals 7. Specifically: the signal output assembly installation structure includes a pair of circuit board slots 2-80 arranged relatively spaced apart, a first component assembly space 2-81, and a second component assembly space. Both 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 one end of the arc extinguishing plate 4a cooperating with the contact terminal 81 extends into the first component assembly space 2-81. Further, as Figure 4 shown, an introduction ramp is provided at the insertion port of each circuit board slot 2-80 to facilitate the insertion of the printed circuit board 80, and a positioning rib 2-800 is provided at the inner end of the circuit board slot 2-80. 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; asFigure 4 As shown, the second component assembly space includes two terminal assembly cavities arranged side by side. There is a terminal partition rib 82-83 between the two terminal assembly cavities. Multiple terminal support ribs 2-820 are provided at the bottom of each terminal assembly cavity. Each terminal assembly cavity is relatively matched with a signal socket 2-82 provided on the circuit breaker housing 2.

[0099] Preferably, as Figure 13B shown, it is the second embodiment of the signal output component 8. The difference from the first embodiment is that between the second signal terminal 82 and the contact terminal 81 through a series-connected diode 84 and current-limiting resistor 85, the first signal terminal 81 is connected to the contact terminal 81 through the 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).

[0100] Preferably, as Figures 14 - 29 shown, the miniature circuit breaker of the present invention further includes a PCB board 7 and a conduction structure. The PCB board 7 is arranged inside the circuit breaker housing 2 and includes a signal lamp 8a. The conduction structure includes a light guiding element 5a and an observation hole. One end of the light guiding element 5a is relatively matched with the signal lamp 8a, and the other end is relatively matched with the observation hole. Further, as Figure 15 、 16 、19, 20, 24, 25, 27-29 shown, the light guiding element 5a includes at least one reflecting surface for reflecting the light emitted by the signal lamp 8a. The light emitted by the signal lamp 8a reaches the observation hole after at least one reflection. Further, as Figure 15 、 16 、19, 20, 24, 25, 27-29 shown, after the light emitted by the signal lamp 8a enters the light guiding element 5a, it is reflected 2n + 1 times and then exits the light guiding element 5a, where n is a natural number, and n is preferably 1 or 3.

[0101] Preferably, as Figure 15 、 16 、19, 20, 24, 25, 27-29 shown, 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.

[0102] Preferably, the light guiding element 5a is a total reflection light guiding element, which can transmit the vast majority of the light emitted by the signal lamp 8a into the observation hole.

[0103] Preferably, as Figures 14 - 25As shown, it is the first embodiment of the conduction structure. Specifically, the observation hole includes a button observation hole 101 provided on the operation button 1. The light guide element 5a is linked with the operation button 1, with one end cooperating with the signal lamp 8a relatively and the other end cooperating with the button observation hole 101 relatively. Further, as Figure 15 、 19 、as shown in 24 and 25, the operation button 1 includes a first assembly cavity 100 provided in the middle thereof and extending along the axis of the operation 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 operation button 1 and communicated with the first assembly cavity 100.

[0104] Preferably, as Figure 16 and 20 shown, it is the first embodiment of the light guide element 5a. Specifically, the light guide element 5a includes a light guide element main 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 provided on the light guide element main 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 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 guide element main body 5-0a and are sequentially spaced along the axis of the light guide element main body 5-0a. The first reflecting surface 51a, the second reflecting surface 52a, and the third reflecting surface 53a are sequentially offset to one side of the light guide element 5a. The fourth reflecting surface 54a is arranged on the other side of the light guide element main body 5-0a, and the third reflecting surface 53a and the fourth reflecting surface 54a are arranged at the same end of the light guide element main body 5-0a. Further, as Figure 15 and 16 shown, when the miniature circuit breaker of the present invention is in the tripped state, the light emitted by the signal lamp 8a enters the light guide element main body 5-0a from one end of the light guide element main body 5-0a, and after being reflected by the first reflecting surface 51a, the fourth reflecting surface 54a, and the third emitting surface 53a in sequence, it exits from the other end of the light guide element main body 5-0a and is visible through the button observation hole 101; as Figure 19 and 20 shown, when the miniature circuit breaker of the present invention is in the closed state, the operation button 1 drives the light guide element 5a to move downward. After the light of the signal lamp 8a enters the light guide element main body 5-0a from one end of the light guide element main body 5-0a, it is reflected by the second reflecting surface 52a, the fourth reflecting surface 54a, and the third reflecting surface 53a in sequence, and then exits from the other end of the light guide element 5-0a and is visible through the button observation hole 101.

[0105] Specifically, as Figures 15 - 16, as shown in Figures 19 - 20, 24 - 25, the signal lamp 8a is arranged on the left side at the lower end of the light guide element 5a, and the upper end of the light guide element 5a is in relative cooperation with the button observation hole 101; as Figure 19 and 24 shown, when pressing the operation button 1 to close the miniature circuit breaker, the light guide element 5a moves downward along with the operation button 1, so that the second emission surface 52a faces the signal lamp 8a; as Figure 15 and 25 shown, when pulling out the operation button 1 to open the miniature circuit breaker, the light guide element 5a moves upward along with the operation button 1, so that the first reflection surface 51a faces the signal lamp 8a; the light emitted by the signal lamp 8a always enters the light guide element 5a from a direction perpendicular to the axial direction of the light guide element 5a and exits from a direction parallel to the axial direction of the light guide element 5a.

[0106] Preferably, as Figure 15 , 17 -19, 21, 22 shown, the miniature circuit breaker of the present invention further includes an indicating member 6a arranged in the first assembly cavity 100 for indicating the open / closed state of the miniature circuit breaker. The indicating member 6a is linked with the operation button 1. The indicating member 6a includes a light-transmitting indicating part 61 - 62a. The indicating part 61 - 62a includes a tripping indication surface 61a and a closing indication surface 62a arranged side by side. The indicating part 61 - 62a is arranged between the light guide element 5a and the button observation hole 101. When the miniature circuit breaker is in the closed state, the closing indication surface 62a is visible through the button observation hole 101. When the miniature circuit breaker is in the open state, the tripping indication surface 61a is visible through the button observation hole 101. Further, as Figure 17 , 18 , 21, 22 shown, the miniature circuit breaker of the present invention further includes a driving member 9a arranged in the circuit breaker housing 1. The driving member 9a includes an indicating member driving platform 90a; the indicating member 6a further includes an indicating member rotating shaft 60a and an indicating member driven part 63a. The indicating member rotating shaft 60a and the indicating part 61 - 62a are respectively located at both ends of the indicating member 6a. The indicating member driven part 63a is connected with the indicating member rotating shaft 60a. The indicating member 6a is rotatably arranged through the indicating member rotating shaft 60a. The indicating member driving platform 90a drives the indicating member 6a to rotate through the indicating member driven part 63a. Further, the indicating member 6a is rotatably connected with the operation button 1 through the indicating member rotating shaft 60a, or the indicating member 6a is rotatably connected with the light guide element 5a through the indicating member rotating shaft 60a. Further, as Figure 15 , 17 -19, 21 - 22 shown, the light guide element 5a includes an indicating member mounting shaft groove 50a. The indicating member rotating shaft mounting groove 50a is arranged between the second reflection surface 52a and the third reflection surface 53a and is on the same side of the light guide element 5a as the second reflection surface 52a and the third reflection surface 53a. The indicating member rotating shaft 60a is rotatably arranged in the indicating member rotating shaft mounting groove 50a.

[0107] Preferably, as Figures 17 - 18 shown in FIGS. 21-22 and 23, the actuating part 63a of the indicating member is a C-shaped structure, including a closing drive part 630a and a tripping drive part 631a respectively arranged at both ends thereof. The middle part of the actuating part 63a of the indicating member is connected to the indicating member rotating shaft 60a. The indicating member driving platform 90a is located in the middle of the C-shaped structure of the actuating part 63a of the indicating member, and is drivingly matched with the closing drive part 630a and the tripping drive part 631a respectively. The indicating member driving platform 90a pushes the closing drive part 630a to rotate the indicating member 6a, and the closing indication surface 62a is visible through the button indication hole 101. The indicating member driving platform 90a pushes the tripping drive part 631a to rotate the indicating member 6a, and the tripping indication surface 61a is visible through the button indication hole 101. The indicating member driving platform 90a and the actuating part 63a of the indicating member are drivingly matched in a mechanical manner, with reliable and stable actions. Moreover, the indicating member 6a switches the closing indication surface 62a and the tripping indication surface 61a in a swinging manner, with a large movement amplitude, ensuring that the tripping / closing state of the miniature circuit breaker is reliably and accurately indicated, and improving the user's electricity use safety.

[0108] Preferably, as Figure 23 shown in the figure, it is an embodiment of the indicating member 6a. Specifically: The indicating member 6a includes an indicating part 61-62a, an indicating member connecting part 64a, an indicating member rotating shaft 60a and an actuating part 63a of the indicating member. The indicating part 61-62a and the indicating member rotating shaft 60a are respectively connected to the indicating member connecting part 64a. One end of the indicating member rotating shaft 60a is connected to the indicating member connecting part 64a, and the other end is connected to the actuating part 63a of the indicating member. The indicating part 61-62a includes a closing indication surface 62a and a tripping indication surface 61a arranged side by side. Both ends of the tripping indication surface 61a are respectively connected to the indicating member connecting part 64a and the closing indication surface 62a. The actuating part 63a of the indicating member is a C-shaped structure, and the middle part is connected to the indicating member rotating shaft 60a, including a closing drive part 630a and a tripping drive part 631a respectively arranged at both ends thereof. Further, as Figure 23 shown in the figure, the indicating member connecting part 64a is an L-shaped structure, and the indicating member connecting part 64a and the indicating part 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 actuating part 63a of the indicating member, and the closing drive part 630a is arranged close to the indicating part 61-62.

[0109] Preferably, as Figures 26 - 29 shown in the figure, it is the second embodiment of the conduction structure. The difference from the first embodiment is that: the observation hole includes a housing observation hole 21 provided on the circuit breaker housing 2. The light guide element 5a is fixedly arranged inside the circuit breaker housing 2, with one end being relatively matched with the signal lamp 8a and the other end being relatively matched with the housing observation hole 21 or inserted into the housing observation hole 21.

[0110] Preferably, as Figure 26 , 27 , as shown in FIGS. 29, the circuit breaker housing 1 includes a circuit breaker operation interface 20 provided at one end thereof, and 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 shown, the miniature circuit breaker of the present invention further includes a first wiring hole 203 and a first wire removal hole 2030 provided on the circuit breaker operation interface 20. The first wiring hole 203 and the first wire removal hole 2030 are in one-to-one cooperation, and the first wiring hole 203 and the first wiring terminal 3a are in one-to-one relative cooperation.

[0111] As Figures 27 - 28 shown, it is a second embodiment of the light guiding element 5a. Specifically: the light guiding element 5a includes a first reflecting surface 51a provided at one end thereof, and an indicator light 8a is provided 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 housing observation hole 21.

[0112] As Figure 29 and 30 shown, it is a third embodiment of the light guiding element 5a. Specifically: the light guiding 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 planes in the same direction and parallel to each other. The first reflecting surface 51a and the third reflecting surface 53a are provided on the same side of the light guiding element 5a and are sequentially offset toward one side of the light guiding element 5a. The first reflecting surface 51a and the third reflecting surface 53a are respectively provided at both ends of the light guiding element 5a. The second reflecting surface 52a is provided on the other side of the light guiding element 51a and is 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 guiding element 5a; the indicator light 8a is provided on one side of the light guiding element 5a. After the emitted light enters the light guiding element 5a, it is sequentially reflected by the first reflecting surface 51a, the second reflecting surface 52a and the third reflecting surface 53a, and then exits the light guiding element 5a and is visible through the housing observation hole 21.

[0113] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. A miniature circuit breaker, which comprises a circuit breaker housing (2), an overload protection mechanism (2a) respectively arranged inside the circuit breaker housing (2), a moving contact (1-1a) and a static contact (1-0a) used in cooperation, and an operating mechanism (4); the overload protection mechanism (2a) is in driving cooperation with the operating mechanism (4), and the moving contact (1-1a) is in driving connection with the operating mechanism (4). It is characterized in that: The overload protection mechanism (2a) comprises a first conductive plate (20a), a first connecting plate (22a) and a bimetal sheet (23a). The two ends of the first connecting plate (22a) are respectively connected with the first conductive plate (20a) and the bimetal sheet (23a); the bimetal sheet (23a) is connected with the first conductive plate (20a) through a first flexible connection (240a) and is connected with the static contact (1-0a) through a second flexible connection (241a); a third flexible connection (242a) is selectively arranged between the first conductive plate (20a) and the static contact (1-0a); when the overload protection mechanism (2a) is used for a small current specification, the third flexible connection (242a) is not arranged between the first conductive plate (20a) and the static contact (1-0a); when the overload protection mechanism (2a) is used for a large current specification, the first conductive plate (20a) and the static contact (1-0a) are connected through the third flexible connection (242a).

2. The miniature circuit breaker according to claim 1, It is characterized in that: The overload protection mechanism (2a) further comprises an adjusting screw (21a). The adjusting screw (21a) is arranged on the first conductive plate (20a) and is in threaded connection therewith, and one end of the adjusting screw (21a) is in relative cooperation with the first connecting plate (22a).

3. The miniature circuit breaker according to claim 2, It is characterized in that: The circuit breaker housing (2) comprises an operating hole (22) corresponding to the other end of the adjusting screw (21a); one end of the first connecting plate (22a) is connected with the middle part of the first conductive plate (20a), and the other end is connected with one end of the bimetal sheet (23a).

4. The miniature circuit breaker according to claim 1, It is characterized in that: The static contact (1-0a) comprises 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 with the bimetal sheet (23a) through a second flexible connection (241a); a third flexible connection (242a) is selectively arranged between the first conductive plate (20a) and the static contact plate (1-00a).

5. The miniature circuit breaker according to claim 1 or 4, It is characterized in that: The first connecting plate (22a) and the bimetallic strip (23a) are integrally in a C-shaped structure, and the opening side of the C-shaped structure faces 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. One end of the first conductive plate (20a) is connected to an external load through the second terminal (3a), and the other end is opposite to one end of the static contact plate (1-00a) of the static contact (1-0a). The other end of the static contact plate (1-00a) is provided with a static contact point (1-01a).

6. The miniature circuit breaker according to claim 1, characterized in that: 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 are in locking cooperation. The handle member (44) is connected to the locking member (41) through the second connecting rod (45). The bimetallic strip (23a) is in driving cooperation with the tripping member (42).

7. The miniature circuit breaker according to claim 6, characterized in that: The tripping member (42) is in a V-shaped structure, and the middle part is rotatably arranged on the circuit breaker housing (2). One end is provided with a tripping receiving column (40) in driving cooperation with the bimetallic strip (23a), and the other end is in locking cooperation with the locking member (41).

8. The miniature circuit breaker according to claim 7, characterized in that: The miniature circuit breaker further includes a short-circuit protection mechanism (6), and the short-circuit protection mechanism (6) is in driving cooperation with the tripping receiving column (40). The short-circuit protection mechanism (6) is a clapper-type electromagnetic mechanism or a direct-acting electromagnetic mechanism.

9. The miniature circuit breaker according to claim 1 or 6, characterized in that: The miniature circuit breaker further includes an operation button (1). One end of the operation button (1) is inserted into the circuit breaker housing (2) and is drivingly connected to the handle member of the operating mechanism (4) through a first connecting rod. Pressing / pulling the operation button (1) closes / opens the miniature circuit breaker through the operating mechanism (4).

10. The miniature circuit breaker according to claim 1, characterized in that: The small current specification is a current value of 63A or less, and the large current specification is a current value of more than 63A.

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