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 and an operation button inserted at one end into the circuit breaker housing. Pressing / pulling the operation button closes / opens the miniature circuit breaker; the miniature circuit breaker further comprises a PCB board and a conduction structure. The PCB board is arranged in the circuit breaker housing and includes a signal lamp. The conduction structure includes a light guiding element and an observation hole. One end of the light guiding element is relatively matched with the signal lamp, and the other end is relatively matched with the observation hole. For the miniature circuit breaker of the present invention, its conduction structure facilitates users to observe the state of the miniature circuit breaker, and is more convenient to use.

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 applied 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 fault occurs in the circuit 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 a large number of them are installed. 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, which affects the efficiency of repair, search or judgment, and there are certain safety hazards.

[0004] Second, when the circuit breaker is used on some equipment with a narrow space, there are defects such as being unable to be installed or having a 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 conduction structure of which is convenient for users to observe the state of the miniature circuit breaker and is more convenient to use.

[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 and an operation button 1 inserted into the circuit breaker housing 2 at one end. Pressing / pulling the operation button 1 makes the miniature circuit breaker close / open; the miniature circuit breaker further includes a PCB board 7a and a conduction structure. The PCB board 7a is arranged in 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.

[0009] Preferably, 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.

[0010] Preferably, 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.

[0011] Preferably, after the light emitted by the signal lamp 8a enters the light guide element 5a, it is reflected 2n + 1 times and then exits the light guide element 5a, where n is a natural number.

[0012] Preferably, the light guide element 5a is a total reflection light guide element.

[0013] Preferably, it is characterized in that: 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, one end is in relative cooperation with the signal lamp 8a, and the other end is in relative cooperation with the button observation hole 101.

[0014] Preferably, 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 5 is arranged in the first assembly cavity 100, and the button observation hole 101 is provided at one end of the operation button 1 and communicated with the first assembly cavity 100.

[0015] Preferably, the miniature circuit breaker further includes an indicating member 6a provided in the first assembly cavity 100 for indicating the opening / closing 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 portion 61-62a. The indicating portion 61-62a includes a tripping indication surface 61a and a closing indication surface 62a arranged side by side. The indicating portion 61-62a is arranged between the light guide element 5a and the button observation hole 101. When the miniature circuit breaker is in the closing state, the closing indication surface 62a is visible through the button observation hole 101. When the miniature circuit breaker is in the tripping state, the tripping indication surface 61a is visible through the button observation hole 101.

[0016] Preferably, the miniature circuit breaker further includes a driving member 9a provided 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 portion 63a. The indicating member rotating shaft 60a and the indicating portion 61-62a are respectively located at both ends of the indicating member 6a. The indicating member driven portion 63a is connected to the indicating member rotating shaft 60a. The indicating member 6a is rotationally arranged through the indicating member rotating shaft 63a. The indicating member driving platform 90a drives the indicating member 6a to rotate through the indicating member driven portion 63a.

[0017] Preferably, the indicating member driven portion 63a is a C-shaped structure, including a closing driving portion 630a and a tripping driving portion 631a respectively provided at both ends thereof. The middle of the indicating member driven portion 63a 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 indicating member driven portion 63a and is in driving cooperation with the closing driving portion 630a and the tripping driving portion 631a respectively.

[0018] Preferably, the observation hole includes a housing observation hole 21 provided on the circuit breaker housing 2. The light guiding element 5a is fixedly provided inside the circuit breaker housing 2, with one end cooperating with the signal lamp 8a and the other end cooperating with or inserted into the housing observation hole 21.

[0019] Preferably, the circuit breaker housing 1 includes a circuit breaker operation interface 20 provided at one end thereof. The housing observation hole 21 is provided on the circuit breaker operation interface 20, and the other end of the operation button 1 protrudes outside the circuit breaker operation interface 20. The miniature circuit breaker further includes a first wiring hole 203 and a first wire removal hole 2030 provided on the circuit breaker operation interface 20, and the first wiring hole 203 and the first wire removal hole 2030 are in one-to-one cooperation.

[0020] For 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, facilitating the user to observe the lighting state of the signal lamp 8a, so as to quickly prompt the user when overhauling, replacing a faulty miniature circuit breaker, searching for a specific circuit breaker, or judging the (opening / closing / tripping) state of the circuit breaker, improving work efficiency and ensuring the personal safety of the user. Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of the miniature circuit breaker of the present invention, and its short-circuit protection mechanism is a clapper electromagnetic mechanism;

[0022] Figure 2 is a schematic structural diagram of the miniature circuit breaker of the present invention, compared with Figure 1 the partition is omitted;

[0023] Figure 3 is of the present invention Figure 1 an enlarged structural diagram of part A;

[0024] Figure 4 is of the present invention Figure 2 an enlarged structural diagram of part B;

[0025] Figure 5 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;

[0026] Figure 6 is a three-dimensional structural diagram of the short-circuit protection mechanism of the present invention, and the short-circuit protection mechanism is a clapper electromagnetic mechanism;

[0027] Figure 7 is a side projection structural diagram of the short-circuit protection mechanism of the present invention. The short-circuit protection mechanism is a clapper electromagnetic mechanism, and at least shows the included angle between the armature and the armature tension spring when the armature is attracted to the yoke;

[0028] Figure 8 It is a schematic exploded view of the short - circuit protection mechanism of the present invention, and the short - circuit protection mechanism is a clapper - type electromagnetic mechanism;

[0029] Figure 9A It is a schematic structural view of the first 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, 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;

[0030] Figure 9B It is a schematic structural view 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 connected to the static contact through the second flexible connection;

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

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

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

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

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

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

[0037] Figure 15 It is a schematic structural view of the cooperation of the signal lamp, the light - guiding element, the indicating member and the operating button when the miniature circuit breaker of the present invention is in the off - state;

[0038] Figure 16 It is a schematic structural view of the first embodiment of the light - guiding element of the present invention, showing the propagation path of the light emitted by the signal lamp in the light - guiding element when the miniature circuit breaker is in the off - state;

[0039] Figure 17 It is a schematic structural view of the cooperation of the driving member and the indicating member when the miniature circuit breaker of the present invention is in the off - state;

[0040] Figure 18 It is a schematic structural view of the cooperation of the driving member and the indicating member at another angle when the miniature circuit breaker of the present invention is in the off - state;

[0041] Figure 19 It is a schematic diagram of the cooperation structure 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;

[0042] Figure 20 It is a schematic diagram of the structure 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;

[0043] Figure 21 It is a schematic diagram of the cooperation 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 It is a schematic diagram of the cooperation 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 schematic diagram of the structure of the indicating member of the present invention;

[0046] 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;

[0047] 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;

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

[0049] 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;

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

[0051] 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;

[0052] 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

[0053] The following is combined with the appendix Figure 1-30The 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 、 2 As 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 movable contact 1-1a and a static contact 1-0a used in conjunction with the operating mechanism 4, 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 driven and connected to the operating mechanism 4, and the operating mechanism 4 is driven and connected to the movable contact 1-1a. When the operating button 1 is pressed / pulled, the movable contact 1-1a and the static contact 1-0a are driven to close / disconnect 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 driven and matched with the operating mechanism 4 respectively. 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 The driving operating mechanism 4 is activated to open (or trip) the miniature circuit breaker; 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 FIGS. 4 and 5, the miniature circuit breaker of the present invention further includes a first terminal 7 and a second terminal 3a respectively provided 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, and 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 whole miniature circuit breaker more compact, which is beneficial to reducing the overall specification of the miniature circuit breaker and conforms to the miniaturization development trend of the miniature circuit breaker.

[0057] Preferably, as Figure 1-5 shown, the miniature circuit breaker of the present invention further includes a signal output component 8. 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. 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.

[0058] 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 connection terminal through the current-limiting resistor 85; the second signal terminal 82 is electrically connected to the output connection terminal through the diode 84; alternatively, the second signal terminal 82 is connected to the output connection terminal of the circuit breaker through the serially connected current-limiting resistor 85 and diode 84. In this embodiment, the second connection terminal 3a serves as the output connection terminal, the first connection terminal 7 is connected to the moving contact 1-1a, the second connection 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 that the temporary large current generated during the closing / opening (the 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 connection terminal of the circuit breaker and the diode 84, it can simultaneously reduce the voltage values at 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 that the signal terminal devices respectively 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 to make the AC signal become a DC signal, so that the signal output component 8 can output AC and DC signals respectively to meet different requirements.

[0059] As Figure 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 provided on the printed circuit board 80, and the printed circuit board 80 is inserted into the circuit breaker housing 2. Further, as Figure 11-12 shown, the current-limiting resistor 85 and the diode 84 are both provided on the printed circuit board 80. Further, as Figure 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 connected to an arc-drawing plate or a wiring plate connected to the static contact 1-0a, or connected to an arc-drawing plate or a wiring plate 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 component 8 is an integrated component and 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, thus significantly improving the installation and wiring efficiency of the signal output component 8 and facilitating user operation.

[0060] Preferably, as Figure 1 , 2 , 5 shows, the operating mechanism 4 includes a locking member 41 and a tripping member 42 that are lock-engaged. The tripping member 42 includes a tripping actuating 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 actuating column 40 from the same side of the tripping actuating column 40, causing the tripping member 42 to rotate and release the lock-engagement with the locking member 41. Further, as Figure 1 and 2 shows, the middle of the tripping actuating 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 actuating 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.

[0061] Preferably, as Figure 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, the included 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 included 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 attraction process of the armature 60 and the yoke 61, the stretching increase (or the pulling force increase) of the armature tension spring 63 is small, which is beneficial 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 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.

[0062] 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.

[0063] Preferably, as Figure 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 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 it is used for small current specifications (current value 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 heat generation requirement of the bimetal 23a; when the overload protection mechanism 2a is used for large current specifications (current value 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 heat generation requirement of the bimetal 23a but also ensures the current-carrying cross-section requirement 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 that 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.

[0064] It should be noted that the first connecting plate 22a generally samples 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 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, form three current channels, and carry most of the current.

[0065] Preferably, as Figure 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 searching for a specific circuit breaker or judging the (opening / closing / tripping) state of the circuit breaker, improve work efficiency, and ensure the personal safety of users.

[0066] It should be noted that the indicator lamp 8a can be set to indicate the opening / closing state, fault state, etc. of the miniature circuit breaker as required, or make a specific indication according to the control command.

[0067] Preferably, as Figure 16 、 20 、28 - 29 shown, 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, as shown in FIGS. 28-29, the direction in which the light of the signal lamp 8a enters the light guide element 5a is the first direction, and the direction in which the light of the signal lamp 8a exits the light guide 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.

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

[0069] As Figure 1 , 2 , as shown in FIG. 5, the miniature circuit breaker of the present invention includes a circuit breaker housing 2, an operation button 1, 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, the miniature circuit breaker is closed / open by the operating mechanism 4.

[0070] Preferably, as Figure 1 , 2 , as shown in FIG. 5, the operation button 1 is arranged at one end of the circuit breaker housing 2, one end of the operation button 1 is inserted into 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.

[0071] Preferably, the first terminal 7 is the incoming line end of the miniature circuit breaker, and the second terminal 3a is the outgoing line end of the miniature circuit breaker. Further, as Figure 1 and 2 shown, 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.

[0072] Specifically, as Figure 1 , 2 , in the direction shown in FIG. 5, taking Figure 1 , 2The upper, lower, left, right sides of 5, and the side facing the reader 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 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 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.

[0073] 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.

[0074] 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 a first connecting rod 46.

[0075] It should be noted that the structure of the operating mechanism 4 is not limited to the above one, and 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.

[0076] Preferably, as Figure 1 、 2 、5 shown, the tripping member 42 includes tripping receiving columns 40 that are respectively drivingly cooperated with the overload protection mechanism 2a and the short-circuit protection mechanism 6. When the miniature circuit breaker has an overload fault or a short-circuit fault, 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 and 2 As shown, the middle part 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 、Figure 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 and release the locking cooperation with the locking fastener 41.

[0077] Specifically, as in the direction shown in Figure 1 and 2 shown, 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 thereof.

[0078] Preferably, as in Figure 1 、 2 、Figure 5 shows, the overload protection mechanism 2a includes a bimetal 23a in driving cooperation with the toggle receiving column 40.

[0079] Preferably, as in Figure 1 、 2 shown, the short-circuit protection mechanism 6 is a clapper-type electromagnetic mechanism, including an armature 60 in driving cooperation with the toggle receiving column 40. Further, as in Figure 1 and 2 shown, the miniature circuit breaker of the present invention further includes a driving link 5. The middle part of the driving link 5 is rotatably arranged on the circuit breaker housing 2, and both ends are in driving cooperation with the armature 60 and the toggle receiving column 40 respectively.

[0080] Preferably, as in Figure 5 shown, the short-circuit protection mechanism 6 is a direct-acting electromagnetic mechanism, including a push rod in driving cooperation with the toggle receiving column 40.

[0081] Preferably, as 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 static contact 1-0a through a second flexible connection 241a; the first conductive plate 20a and the static 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 static 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 static contact plate 1-00a of the static contact 1-0a.

[0082] 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 operating hole 22 corresponding to the other end of the adjusting screw 21a. The user can screw the adjusting screw 21a through the operating hole 22 to adjust the overload protection characteristics of the overload protection mechanism.

[0083] 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 static contact 1-0a through a third flexible connection 242a; both ends of the second conductive plate connection portion are respectively bent and connected to the first conductive plate connection portion and the third conductive plate connection portion. 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.

[0084] 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 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 with it.

[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 Figures 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 6As shown, the armature 60 includes a plurality of spring suspension holes which 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 suspension hole.

[0090] 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 (the length direction) of the circuit - breaker housing 2.

[0091] 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 of 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. Each yoke arm 611 has 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 which are arranged side by side at intervals 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 of 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.

[0092] Preferably, as Figure 8 shown, the armature 60 includes an opening 65 provided in the middle thereof. Three spring suspension holes are provided on one side of the opening 65, namely the first spring suspension hole 65 - 0, the second spring suspension hole 65 - 1 and the third spring suspension hole 65 - 2. The three spring suspension holes are arranged side by side at intervals along the length direction of the armature 60. Further, as Figure 8 shown, one end of each spring suspension hole is communicated with the opening 65, which is convenient for the armature tension spring 63 to enter or exit the spring suspension hole.

[0093] Specifically, as Figure 1 and 2As shown, after the short - circuit protection mechanism 6 is assembled to 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, and the driving link 5 is arranged between the operating mechanism 4 and the short - circuit protection mechanism 6. The upper and lower ends are respectively in driving cooperation with the trip - buckle actuating 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, driving the driving link 5 to swing clockwise, and the driving link 5 drives the rotation of the trip - buckle actuating column 40 from the lower side. Further, as Figure 1 and Figure 2 show, 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.

[0094] Preferably, as Figure 1 、 2 、Figure 5、Figures 11 - 13 show, the miniature circuit - breaker of the present invention further includes a signal output component 8. The operating 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 operating 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.

[0095] Preferably, as Figure 11-13A Figure 14 shows, 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 Figure 1 and 3 Figure 17 show, 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 connections of the first signal terminal 83, the current - limiting resistor 85 and the contact terminal 81, and the connections 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.

[0096] Preferably, as Figure 13A 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, as Figure 11-12 shown, the first signal terminal 83 and the second signal terminal 82 are arranged side by side at intervals on one side (front and back sides) 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 (opposite side or front side) of the printed circuit board 80.

[0098] Preferably, as Figure 11-12 shown, the first signal terminal 83, the second signal terminal 82 and the contact terminal 81 are all plug-in type terminals. Further, as Figure 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 oppositely arranged terminal clamping plates. The two terminal clamping plates are respectively bent and connected to both ends of the terminal base plate, and the middle parts of the two terminal clamping plates bulge towards each other, forming an X-shaped structure as a whole. Further, as Figure 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.

[0099] Preferably, as Figure 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 on 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 can be inserted into the arc guiding plate 4a while the printed circuit board 80 is installed.

[0100] Further, as Figure 3-4As shown, the circuit breaker housing 2 includes a signal output component mounting structure, which is located between two first connection terminals 7. Specifically: the signal output component mounting structure includes a pair of circuit board slots 2-80 arranged at a relative interval, a first component assembly space 2-81, and a second component assembly space. Both ends of the printed circuit board 80 are inserted into the two circuit board slots 2-80 respectively. The first component assembly space 1-81 and the second component assembly space are located on both sides of the printed circuit board 80 respectively; the contact connection 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 ignition plate 4a cooperating with the contact connection terminal 81 extends into the first component assembly space 2-81. Further, as Figure 4 shown, at the insertion port of each of the circuit board slots 2-80, an introduction ramp is provided to facilitate the insertion of the printed circuit board 80. At the inner end of the circuit board slot 2-80, a positioning rib 2-800 is provided. The printed circuit board 80 is inserted into the circuit board slot 2-80 until it abuts against the positioning rib 2-800, ensuring that the printed circuit board 80 is installed in place; as Figure 4 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. At the bottom of each terminal assembly cavity, a plurality of terminal support ribs 2-820 are provided. Each terminal assembly cavity is in relative cooperation with a signal socket 2-82 provided on the circuit breaker housing 2.

[0101] Preferably, as Figure 13B shown, for the second embodiment of the signal output component 8, which is different from the first embodiment in that: between the second signal terminal 82 and the contact connection terminal 81 through the serially connected diode 84 and current-limiting resistor 85, the first signal terminal 81 is connected to the contact connection 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 connection terminal 81).

[0102] Preferably, as Figure 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 in relative cooperation with the signal lamp 8a, and the other end is in relative cooperation 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, as shown in Figures 16, 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 exits the light guide element 5a, where n is a natural number and n is preferably 1 or 3.

[0103] Preferably, as Figure 15 , 16 , as shown in Figures 19, 20, 24, 25, 27 - 29, the direction in which the light emitted by the signal lamp 8a enters the light guide element 5a is the first direction, and the direction in which the light emitted by the signal lamp 8a exits the light guide 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 guide element 5a.

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

[0105] Preferably, as Figure 14-25 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 Figures 24, 25, the operation button 1 includes a first assembly cavity 100 provided in the middle thereof and extending along the axial direction 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 provided at one end of the operation button 1 and communicated with the first assembly cavity 100.

[0106] 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 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 guide element main body 5 - 0a and are sequentially spaced along the axial direction 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 towards 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 and16 As shown, the miniature circuit breaker of the present invention is in the tripped state. After the light emitted by the signal lamp 8a enters one end of the light guide element main body 5-0a, it passes through the first reflection surface 51a, the fourth reflection surface 54a, and the third emission surface 53a in sequence, and then 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, 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. After 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 passes through the second reflection surface 52a, the fourth reflection surface 54a, and the third reflection 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.

[0107] Specifically, as Figure 15-16 , 19-20, 24-25 shown, 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 relatively matched with the button observation hole 101; as Figure 19 and 24 shown, when pressing the operating button 1 to close the miniature circuit breaker, the light guide element 5a moves downward with the operating button 1, so that the second emission surface 52a faces the signal lamp 8a; as Figure 15 and 25 shown, when pulling the operating button 1 to trip the miniature circuit breaker, the light guide element 5a moves upward with the operating 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 axis of the light guide element 5a and exits from a direction parallel to the axis of the light guide element 5a.

[0108] 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 tripped / closed state of the miniature circuit breaker. The indicating member 6a is linked with the operating button 1. The indicating member 6a includes a light-transmitting indicating portion 61-62a. The indicating portion 61-62a includes a tripped indicating surface 61a and a closed indicating surface 62a arranged side by side. The indicating portion 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 closed indicating surface 62a is visible through the button observation hole 101. When the miniature circuit breaker is in the tripped state, the tripped indicating 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 within the circuit breaker housing 1, and 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 portion 63a. The indicating member rotating shaft 60a and the indicating portion 61 - 62a are respectively located at both ends of the indicating member 6a. The indicating member driven portion 63a is connected to the indicating member rotating shaft 60a. The indicating member 6a is rotatably disposed through the indicating member rotating shaft 60a, and the indicating member driving platform 90a drives the indicating member 6a to rotate through the indicating member driven portion 63a. Further, the indicating member 6a is rotatably connected to the operating button 1 through the indicating member rotating shaft 60a, or the indicating member 6a is rotatably connected to the light guiding element 5a through the indicating member rotating shaft 60a. Further, as Figure 15 , as shown in Figures 17 - 19, 21 - 22, the light guiding element 5a includes an indicating member mounting shaft groove 50a. The indicating member rotating shaft mounting groove 50a is disposed between the second reflecting surface 52a and the third reflecting surface 53a, and is on the same side of the light guiding element 5a as the second reflecting surface 52a and the third reflecting surface 53a. The indicating member rotating shaft 60a is rotatably disposed within the indicating member rotating shaft mounting groove 50a.

[0109] Preferably, as Figure 17-18 , as shown in Figures 21 - 22, 23, the indicating member driven portion 63a is a C-shaped structure, including a closing driving portion 630a and a tripping driving portion 631a respectively disposed at both ends thereof. The middle portion of the indicating member driven portion 63a 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 indicating member driven portion 63a, and is in driving cooperation with the closing driving portion 630a and the tripping driving portion 631a respectively. The indicating member driving platform 90a pushes the closing driving portion 630a to rotate the indicating member 6a, and the closing indicating surface 62a is visible through the button indicating hole 101. The indicating member driving platform 90a pushes the tripping driving portion 631a to rotate the indicating member 6a, and the tripping indicating surface 61a is visible through the button indicating hole 101. The indicating member driving platform 90a and the indicating member driven portion 63a are in driving cooperation by mechanical means, with reliable and stable operation. Moreover, the indicating member 6a switches the closing indicating surface 62a and the tripping indicating surface 61a by means of swinging, 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.

[0110] Preferably, as Figure 23As shown, it is an embodiment of the indicating member 6a. Specifically: The indicating member 6a includes an indicating portion 61 - 62a, an indicating member connecting portion 64a, an indicating member rotating shaft 60a, and an indicating member driven portion 63a. The indicating portion 61 - 62a and the indicating member rotating shaft 60a are respectively connected to the indicating member connecting portion 64a. One end of the indicating member rotating shaft 60a is connected to the indicating member connecting portion 64a, and the other end is connected to the indicating member driven portion 63a. The indicating portion 61 - 62a includes a closing indicating surface 62a and a tripping indicating surface 61a arranged side by side. Both ends of the tripping indicating surface 61a are respectively connected to the indicating member connecting portion 64a and the closing indicating surface 62a. The indicating member driven portion 63a is a C-shaped structure, and the middle part is connected to the indicating member rotating shaft 60a, and includes a closing driving portion 630a and a tripping driving portion 631a respectively provided at both ends thereof. Further, as Figure 23 shown, the indicating member connecting portion 64a is an L-shaped structure, and the indicating member connecting portion 64a and the indicating 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 indicating member driven portion 63a, and the closing driving portion 630a is arranged close to the indicating portion 61 - 62.

[0111] Preferably, as Figures 26-29 shown, 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 guiding element 5a is fixedly provided 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.

[0112] Preferably, as Figure 26 、 27 、29 shown, the circuit breaker housing 1 includes a circuit breaker operation interface 20 provided at one end thereof. The 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.

[0113] As Figures 27-28As shown, it is the second embodiment of the light guide element 5a. Specifically, the light guide element 5a includes a first reflecting surface 51a provided at one end thereof. The indicating lamp 8a is provided 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, then exits the light guide element 5a and is visible through the housing observation hole 21.

[0114] As Figure 29 and 30 shown, it is the 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 planes with the same direction and are parallel to each other. The first reflecting surface 51a and the third reflecting surface 53a are provided on the same side of the light guide element 5a and are sequentially offset towards one side of the light guide element 5a. The first reflecting surface 51a and the third reflecting surface 53a are respectively provided at both ends of the light guide element 5a. The second reflecting surface 52a is provided 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 indicating lamp 8a is provided on one side of the light guide element 5a. After the emitted light enters the light guide element 5a, it is sequentially reflected by the first reflecting surface 51a, the second reflecting surface 52a and the third reflecting surface 53a, then exits the light guide element 5a and is visible through the housing observation hole 21.

[0115] 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 pertains, 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, comprising a circuit breaker housing (2) and an operating button (1) with one end inserted into the circuit breaker housing (2), wherein the miniature circuit breaker is closed or opened by pressing or pulling the operating button (1); the operating button (1) comprises a first assembly cavity (100) arranged in the middle thereof and extending along the axial direction of the operating button (1), and a button observation hole (101) arranged at one end of the operating button (1) and communicating with the first assembly cavity (100); the miniature circuit breaker further comprises an indicator (6a) arranged in the first assembly cavity (100) for indicating the opening / closing state of the miniature circuit breaker, the indicator (6a) being linked to the operating button (1), and the indicator (6a) comprising a light-transmitting indicator portion (61-62a); and characterized in that: The miniature circuit breaker further comprises a PCB board (7a) and a conducting structure, wherein the PCB board (7a) is arranged in the circuit breaker housing (2) and comprises a signal light (8a), the conducting structure comprises a light guide element (5a) and an observation hole, the observation hole comprises a button observation hole (101), one end of the light guide element (5a) is oppositely matched with the signal light (8a), and the other end is oppositely matched with the observation hole; the indicating portion (61-62a) is arranged between the light guide element (5a) and the button observation hole (101).

2. The miniature circuit breaker according to claim 1, characterized in that: The light-guiding element (5a) comprises 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 being reflected at least once.

3. The miniature circuit breaker according to claim 2, characterized in that: 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.

4. The miniature circuit breaker according to claim 2, characterized in that: After the light emitted by the signal lamp (8a) enters the light guide element (5a), it is reflected 2n+1 times and then exits the light guide element (5a), where n is a natural number.

5. The miniature circuit breaker according to claim 1, characterized in that: The light guide element (5a) is a total reflection light guide element.

6. The miniature circuit breaker according to any one of claims 1 to 5, characterized in that: The light guide element (5a) is linked to the operating button (1), with one end corresponding to the signal light (8a) and the other end corresponding to the button observation hole (101).

7. The miniature circuit breaker according to claim 6, characterized in that: The indicating portion (61-62a) comprises an opening indicating surface (61a) and a closing indicating surface (62a) arranged side by side; when the miniature circuit breaker is in a closing state, the closing indicating surface (62a) is visible through the button observation hole (101); when the miniature circuit breaker is in an opening state, the opening indicating surface (61a) is visible through the button observation hole (101).

8. The miniature circuit breaker according to claim 7, characterized in that: The miniature circuit breaker further comprises a driving member (9a) arranged in the circuit breaker housing (1), the driving member (9a) comprising an indicator driving platform (90a); the indicator (6a) further comprises an indicator rotating shaft (60a) and an indicator driven portion (63a), the indicator rotating shaft (60a) and the indicator portion (61-62a) being respectively located at two ends of the indicator (6a), the indicator driven portion (63a) being connected to the indicator rotating shaft (60a), the indicator (6a) being rotatably arranged via the indicator rotating shaft (63a), and the indicator driving platform (90a) driving the indicator (6a) to rotate via the indicator driven portion (63a).

9. The miniature circuit breaker according to claim 8, characterized in that: The indicator driven part (63a) is a C-shaped structure, comprising a closing drive part (630a) and an opening drive part (631a) respectively arranged at both ends thereof; the middle part of the indicator driven part (63a) is connected to the indicator rotating shaft (60a); the indicator driving platform (90a) is located in the middle part of the C-shaped structure of the indicator driven part (63a), and is driven and matched with the closing drive part (630a) and the opening drive part (631a) respectively.

10. The miniature circuit breaker according to claim 6, characterized in that: The indicator (6a) is rotationally connected to the light guide element (5a) via an indicator rotating shaft (60a).

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