Miniature circuit breaker

Abstract

The application relates to the field of low-voltage electrical apparatus, in particular to a small circuit breaker which comprises a circuit breaker shell, an operation button, an overload protection mechanism and an operation mechanism arranged in the circuit breaker shell respectively; the overload protection mechanism and the operation mechanism are arranged in the middle part of the circuit breaker shell in a laminated mode, the operation button is arranged at one end of the circuit breaker shell and located at one side of the operation mechanism; the small circuit breaker has a reasonable and compact internal layout.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of low-voltage electrical apparatus, in particular to a small circuit breaker. BACKGROUND

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

[0003] Firstly, the existing circuit breakers are generally installed in distribution boxes. When the line 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 step by step, which is cumbersome. Especially for plug-in circuit breakers, they are generally installed in cabinets and the number of installations is large. When repairing, replacing, or finding a specific circuit breaker or judging the state of the circuit breaker, a lot of time and effort is required, which affects the efficiency of repair, finding, or judgment, and there is a certain safety hazard.

[0004] Secondly, when the circuit breaker is used in some equipment with small space, it cannot be installed or the installation cost is high.

[0005] Thirdly, the signal output component of the circuit breaker can only output a single type of signal, which cannot meet the demand, and the installation reliability of the signal output component is low. SUMMARY

[0006] The purpose of the present application is to overcome the defects of the prior art and provide a small circuit breaker with reasonable and compact internal layout.

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

[0008] A small circuit breaker comprises a circuit breaker housing 2, an operating button 1, and an overload protection mechanism 2a and an operating mechanism 4 arranged in the circuit breaker housing 2 respectively; the overload protection mechanism 2a and the operating mechanism 4 are arranged in the middle part of the circuit breaker housing 2 in a stacked manner, and the operating button 1 is arranged at one end of the circuit breaker housing 2 and located at one side of the operating mechanism 4.

[0009] Preferably, the small circuit breaker further comprises an arc-extinguishing chamber 9 and a short-circuit protection mechanism 6, and the arc-extinguishing chamber 9 and the short-circuit protection mechanism 6 are arranged side by side at the other side of the operating mechanism 4.

[0010] Preferably, the small circuit breaker further comprises a first wiring terminal 7 and a second wiring terminal 3a arranged at both ends of the circuit breaker housing 2 respectively; the second wiring terminal 3a and the operating button 1 are located at the same end of the circuit breaker housing 2.

[0011] Preferably, the arc extinguishing chamber 9 and the second terminal 3a are opposite to each other and are respectively located on two sides of the overload protection mechanism 2a; the operating button 1 and the short-circuit protection mechanism 6 are opposite to each other and are respectively located on two sides of the operating mechanism 4.

[0012] Preferably, the miniature circuit breaker further comprises a signal output assembly 8 arranged in the circuit breaker housing 2, the signal output assembly 8 and the first terminal 7 are located at the same end of the circuit breaker housing 2, and the signal output assembly 8 is arranged between the two first terminals 7.

[0013] Preferably, the signal output assembly 8 comprises a printed circuit board 80 and a first signal terminal 83, a second signal terminal 82 and a contact terminal 81 arranged on the printed circuit board 80 respectively; the first signal terminal 83 and the second signal terminal 82 are arranged side by side and spaced apart on one side of the printed circuit board 80, and the contact terminal 81 is arranged on the other side of the printed circuit board 80, and the contact terminal 81 is electrically connected with the stationary contact 1-0a of the miniature circuit breaker.

[0014] Preferably, the signal output assembly 8 further comprises a current limiting resistor 85 and a diode 84, 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.

[0015] Preferably, the current limiting resistor 85, the diode 84 and the contact terminal 81 are arranged on the same side of the printed circuit board 80.

[0016] Preferably, the first signal terminal 83, the second signal terminal 82 and the contact terminal 81 are all plug-in type terminals.

[0017] Preferably, the miniature circuit breaker further comprises a partition plate 3, the circuit breaker housing 2 comprises a housing base, the partition plate 3 is connected with the housing base, and the operating mechanism 4 is arranged between the partition plate 3 and the housing base.

[0018] Preferably, the operating mechanism 4 comprises a locking piece 41, a jumping piece 42, a rotating plate 43, a handle piece 44 and a second connecting rod 45, the rotating plate 43 and the handle piece 44 are respectively pivotally arranged on the circuit breaker housing 2, the locking piece 41 and the jumping piece 42 are respectively pivotally arranged on the rotating plate 43 and are locked and matched, and the handle piece 44 is drivingly connected with the locking piece 41 through the second connecting rod 45; the miniature circuit breaker further comprises the operating button 1, one end of the operating button 1 is arranged in the circuit breaker housing 2 and is slidingly matched with the circuit breaker housing 2, and the operating button 1 is drivingly connected with the handle piece 44 through a first connecting rod 46 to drive the handle piece 44 to rotate.

[0019] Preferably, the jumping piece 42 and the rotating plate 43 are coaxially arranged, and the two ends of the rotating shaft of the rotating plate 43 and the two ends of the rotating shaft of the handle piece 44 are respectively limitingly matched with the housing base and the partition plate 3.

[0020] Preferably, the shackle member 42 comprises a shackle driving post 40, which is driven in cooperation with the overload protection mechanism 2a and the short-circuit protection mechanism 6 respectively.

[0021] The small circuit breaker has a well-designed internal layout, a more reasonable layout, and a more sufficient utilization of the internal space of the circuit breaker shell 2, so that the whole small circuit breaker is more compact, which is conducive to reducing the overall size of the small circuit breaker and conforms to the miniaturization development trend of the small circuit breaker. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic view of the small circuit breaker of the present application, and the short-circuit protection mechanism thereof is a snap-type electromagnetic mechanism;

[0023] Figure 2 is a structural schematic view of the small circuit breaker of the present application, and the short-circuit protection mechanism thereof is a snap-type electromagnetic mechanism; Figure 1 compared with the prior art, the partition plate is omitted;

[0024] Figure 3 is an enlarged structural schematic view of part A of the present application; Figure 1

[0025] Figure 4 is an enlarged structural schematic view of part B of the present application; Figure 2

[0026] Figure 5 is a structural schematic view of the small circuit breaker of the present application, and the short-circuit protection mechanism thereof is a direct-acting electromagnetic mechanism;

[0027] Figure 6 is a three-dimensional structural schematic view of the short-circuit protection mechanism of the present application, and the short-circuit protection mechanism is a snap-type electromagnetic mechanism;

[0028] Figure 7 is a side projection structural schematic view of the short-circuit protection mechanism of the present application, and the short-circuit protection mechanism is a snap-type electromagnetic mechanism, which shows at least the included angle between the armature and the armature tension spring when the armature is attracted to the magnetic yoke;

[0029] Figure 8 is an exploded structural schematic view of the short-circuit protection mechanism of the present application, and the short-circuit protection mechanism is a snap-type electromagnetic mechanism;

[0030] Figure 9A is a structural schematic view of the first embodiment of the overload protection mechanism of the present application, and the bimetallic strip is connected to the first conductive plate through a first soft connection, connected to the static contact through a second soft connection, and connected between the first conductive plate and the static contact through a third soft connection;

[0031] Figure 9B ​​It is the structural schematic view of the second embodiment of the overload protection mechanism, the bimetallic strip is connected with the first conductive plate through the first soft connection and connected with the static contact through the second soft connection;

[0032] Figure 10 It is the structural schematic view of the partition plate;

[0033] Figure 11 It is the structural schematic view of the signal output assembly, at least the structure of one side of the printed circuit board is shown;

[0034] Figure 12 It is the structural schematic view of the signal output assembly, at least the structure of the other side of the printed circuit board is shown;

[0035] Figure 13A It is the circuit principle schematic view of the first embodiment of the signal output assembly;

[0036] Figure 13B It is the circuit principle schematic view of the second embodiment of the signal output assembly;

[0037] Figure 14 It is the structural schematic view of the miniature circuit breaker, at least the button observation hole is shown;

[0038] Figure 15 It is the cooperation structure schematic view of the signal lamp, the light guide element, the indicating element and the operation button when the miniature circuit breaker is in the tripping state;

[0039] Figure 16 It is the structural schematic view of the first embodiment of the light guide element, the propagation path of the light emitted by the signal lamp in the light guide element when the miniature circuit breaker is in the tripping state is shown;

[0040] Figure 17 It is the cooperation structure schematic view of the driving element and the indicating element when the miniature circuit breaker is in the tripping state;

[0041] Figure 18 It is another angle cooperation structure schematic view of the driving element and the indicating element when the miniature circuit breaker is in the tripping state;

[0042] Figure 19 It is the cooperation structure schematic view of the signal lamp, the light guide element, the indicating element and the operation button when the miniature circuit breaker is in the closing state;

[0043] Figure 20 It is the structural schematic view of the first embodiment of the light guide element, the propagation path of the light emitted by the signal lamp in the light guide element when the miniature circuit breaker is in the closing state is shown;

[0044] Figure 21is a schematic view of the cooperation structure between the driving member and the indicating member when the miniature circuit breaker of the present application is in the closed state;

[0045] Figure 22 is a schematic view of the cooperation structure between the driving member and the indicating member from another angle when the miniature circuit breaker of the present application is in the closed state;

[0046] Figure 23 is a schematic view of the structure of the indicating member of the present application;

[0047] Figure 24 is a schematic view of the cooperation structure between the signal lamp, the light guide element and the operation button when the miniature circuit breaker of the present application is in the closed state;

[0048] Figure 25 is a schematic view of the cooperation structure between the signal lamp, the light guide element and the operation button when the miniature circuit breaker of the present application is in the open state;

[0049] Figure 26 is a schematic view of the structure of the miniature circuit breaker of the present application, at least showing the shell observation hole;

[0050] Figure 27 is a schematic view of the cooperation structure between the signal lamp, the light guide element and the shell observation hole of the miniature circuit breaker of the present application, the light emitted by the signal lamp is emitted from the light guide element after one reflection;

[0051] Figure 28 is a schematic view of the structure of the second embodiment of the light guide element of the present application;

[0052] Figure 29 is a schematic view of the cooperation structure between the signal lamp, the light guide element and the shell observation hole of the miniature circuit breaker of the present application, the light emitted by the signal lamp is emitted from the light guide element after three reflections;

[0053] Figure 30 is a schematic view of the structure of the third embodiment of the light guide element of the present application. DETAILED DESCRIPTION

[0054] The following embodiments are given to further illustrate the specific implementation of the miniature circuit breaker of the present application. The miniature circuit breaker of the present application is not limited to the description of the following embodiments. Figures 1-30 As

[0055] , Figure 1 , 2, 5, 14, 26, the miniature circuit breaker comprises a circuit breaker shell 2 and an operating button 1, and 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 arranged in the circuit breaker shell 2 respectively; the operating button 1 is arranged at one end of the circuit breaker shell 2, one end of the operating button 1 is arranged in the circuit breaker shell 2 and is in sliding fit with the circuit breaker shell 2; the operating button 1 is drivingly connected with the operating mechanism 4, the operating mechanism 4 is drivingly connected with the movable contact 1-1a, the operating button 1 is pressed / pulled, the movable contact 1-1a and the static contact 1-0a are closed / opened through the operating mechanism 4, and the miniature circuit breaker is closed / opened; the overload protection mechanism 2a and the short-circuit protection mechanism 6 are drivingly connected with the operating mechanism 4 respectively, when the miniature circuit breaker appears overload or short-circuit fault, the overload protection mechanism 2a or the short-circuit protection mechanism 6 drives the operating mechanism 4 to act, and the miniature circuit breaker is opened (or tripped); the arc extinguishing chamber 9 is used for extinguishing the arc generated when the movable contact 1-1a and the static contact 1-0a are closed or broken.

[0056] It should be pointed out that the arc extinguishing chamber 9, the overload protection mechanism 2a and the short-circuit protection mechanism 6 can be arranged or omitted according to actual needs, that is, one or more of the three can not be arranged in the miniature circuit breaker. The miniature circuit breaker of the application preferably comprises the arc extinguishing chamber 9, the overload protection mechanism 2a and the short-circuit protection mechanism 6.

[0057] Preferably, as shown in Figure 1 、 2 and 5, the internal layout of the miniature circuit breaker of the application is improved, and specifically as follows: the overload protection mechanism 2a and the operating mechanism 4 are arranged in a stack in the middle of the circuit breaker shell 2, and the operating button 1 is located on one side of the operating mechanism 4. Figure 1 、 2 Further, as shown in Figure 1 、 2As shown in Figures 5 and 6, the miniature circuit breaker of the present invention further includes a first terminal 7 and a second terminal 3a, respectively disposed at opposite ends of the circuit breaker housing 2. The second terminal 3a and the operating button 1 are located at the same end of the circuit breaker housing 2. The first terminal 7 and the second terminal 3a serve as the input and output terminals of the miniature circuit breaker, respectively. One of the first terminal 7 and the second terminal 3a is electrically connected to the static contact 1-0a, and the other is electrically connected to the movable contact 1-1a. The input terminal is connected to a power source, and the output terminal is connected to an external load. In this embodiment, the first terminal 7 serves as the input terminal, and the second terminal 3a serves as the output terminal. The first terminal 7 is connected to the movable contact 1-1a, and the second terminal 3a is electrically connected to the static contact 1-0a. Alternatively, the second terminal 3a can serve as the input terminal and the first terminal 7 as the output terminal. Alternatively, the first terminal 7 can be electrically connected to the static contact 1-0a, while the second terminal 3a is connected to the movable contact 1-1a. The miniature circuit breaker of the present invention has a carefully designed internal layout, which is more reasonable and makes fuller use of the internal space of the circuit breaker housing 2, making the entire miniature circuit breaker more compact, which is conducive to reducing the overall specifications of the miniature circuit breaker and conforming to the miniaturization development trend of miniature circuit breakers.

[0058] Preferably, Figures 1-5 As shown, the miniature circuit breaker of the present invention further includes a signal output assembly 8. The signal output assembly 8 and the first terminal 7 are located at the same end of the circuit breaker housing 2. The signal output assembly 8 is located between two first terminals 7 arranged side by side. One of the two first terminals 7 is used to connect to the L pole of the power supply, and the other is used to connect to the N pole.

[0059] Preferably, Figure 13A and 13BAs shown in the figure, the signal output assembly 8 comprises a first signal terminal 83, a current-limiting resistor 85, a second signal terminal 82 and a diode 84; the first signal terminal 83 is electrically connected to the output terminal via the current-limiting resistor 85; the second signal terminal 82 is electrically connected to the output terminal via the diode 84; or, the second signal terminal 82 is connected to the output terminal of the circuit breaker via the current-limiting resistor 85 and the diode 84 in series. In this embodiment, the second terminal 3a serves as the output terminal, the first terminal 7 is connected to the movable contact 1-1a, the second terminal 3a is electrically connected to the fixed contact 1-0a, the first signal terminal 83 is electrically connected to the fixed contact 1-0a via the current-limiting resistor 85, and the second signal terminal 82 is electrically connected to the fixed contact 1-0a via the diode 84. The current-limiting resistor 85 of the signal output assembly 8 can increase the total resistance value of the load of the first signal terminal 83, thereby preventing the signal terminal device from being burned by the temporary large current generated during the closing / opening (closing / opening of the movable contact 1-1a and the fixed contact 1-0a) of the miniature circuit breaker; at the same time, the current-limiting resistor 85 also plays a role in voltage division, avoiding the risk of electric shock caused by accidental contact with the second signal terminal 82 by users or other personnel; when the current-limiting resistor 85 is connected in series between the output terminal of the circuit breaker and the diode 84, it can simultaneously reduce the voltage values at the first signal terminal 82 and the second signal terminal 83, thereby reducing the risk of electric shock caused by accidental contact by users or other personnel, and avoiding 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 signals output by the second signal terminal 82, so that the alternating current signal becomes a direct current signal, and the signal output assembly 8 can output alternating current signals and direct current signals respectively, meeting different needs.

[0060] As shown in Figures 1-3 , 11-12, the signal output assembly 8 comprises a printed circuit board 80 and a first signal terminal 83 and a second signal terminal 82 disposed on the printed circuit board 80 respectively, and the printed circuit board 80 is inserted on the circuit breaker housing 2. Further, as shown in Figures 11-12 , the current-limiting resistor 85 and the diode 84 are disposed on the printed circuit board 80. Further, as shown in Figures 11-12As shown, the signal output assembly 8 further comprises a contact terminal 81 for electrical connection with an output terminal, for example, the contact terminal 81 is connected with the static contact 1-0a, or the contact terminal 81 is connected with an arc plate or a terminal plate connected with the static contact 1-0a, or connected with an arc plate or a terminal plate connected with 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, and the first signal terminal 83 is connected with the node between the current limiting resistor 85 and the diode 84. The signal output assembly 8 is an integrated component, which can be fixed and installed on the circuit breaker housing 2 through the printed circuit board 80, and the contact terminal 81, the first signal terminal 83 and the second signal terminal 82 facilitate the wiring of the signal output assembly 8, thereby significantly improving the installation and wiring efficiency of the signal output assembly 8 and facilitating user operation.

[0061] Preferably, as shown in Figure 1 , 2 , the operating mechanism 4 comprises a lock piece 41 and a trip piece 42 in lock cooperation, and the trip piece 42 comprises trip driven columns 40 in driving cooperation with the overload protection mechanism 2a and the short-circuit protection mechanism 6 respectively. Further, as shown in Figure 1 , 2 , the overload protection mechanism 2a and the short-circuit protection mechanism 6 push the trip driven columns 40 from the same side of the trip driven columns 40 to rotate the trip piece 42 and release the lock cooperation with the lock piece 41. Further, as shown in Figure 1 and 2 , the trip driven columns 40 are connected with the trip piece 42 in the middle, one end 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. The overload protection mechanism 2a and the short-circuit protection mechanism 6 of the miniature circuit breaker are in driving cooperation with the trip driven columns 40, so that the miniature circuit breaker is tripped when an overload or short-circuit fault occurs, and 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.

[0062] Preferably, as shown in Figures 1-2 , 6-8, the short-circuit protection mechanism 6 is a clapping type electromagnetic mechanism, comprising a magnetic yoke 61, an armature 60, an armature tension spring 63 and a conductive plate 64, the conductive plate 64 is arranged in the middle of the magnetic yoke 61, the armature 60 is rotatably arranged at one end, the armature 60 is in opposite cooperation with the magnetic yoke 61, and the armature tension spring 63 is connected with the armature 60 at one end and fixedly arranged at the other end; 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 shown in Figure 7As shown, when the armature 60 and the yoke 61 are attracted, the angle between the axis of the armature tension spring 63 and the axis of the armature 60 is α, 3°≤α≤30°. The angle between the axis of the armature tension spring 63 and the axis of the armature 60 of the short-circuit protection mechanism 6 is an acute angle, so that during the attraction process of the armature 60 and the yoke 61, the stretching increase (or tension increase) of the armature tension spring 63 is small, which is conducive to the rapid attraction of the armature 60 and the yoke 61, thereby improving the breaking capacity of the miniature circuit breaker. Further, as Figures 6-8 As shown, the armature 60 includes a plurality of spring holes, which are arranged side by side and spaced apart. From the first to the last spring hole, they are offset in the direction of the armature tension spring 63, so that the short-circuit protection mechanism 6 can adjust the connection position of the armature tension spring 63 and the armature 60 (connected to the armature 60 through different spring holes) to achieve the adjustment of the suction and reaction force characteristics, thereby meeting the protection characteristics requirements of the small circuit breaker.

[0063] Expenditures required, such as Figure 5 As shown, the short-circuit protection mechanism 6 of the miniature circuit breaker of the present invention can also be a direct-acting electromagnetic mechanism; the miniature circuit breaker of the present invention preferably adopts the short-circuit protection mechanism 6 of the snap-action electromagnetic mechanism, so as to more conveniently adjust the suction and reaction force characteristics.

[0064] Preferably, Figures 1-2 As shown in Figures 9A-9B, the overload protection mechanism 2a includes a first conductive plate 20a, a first connecting plate 22a and a bimetallic strip 23a, and the two ends of the first connecting plate 22a are respectively connected to the first conductive plate 20a and the bimetallic strip 23a; the bimetallic strip 23a is connected to the first conductive plate 20a through a first soft connection 240a and is connected to the static contact 1-0a through a second soft connection 241a; a third soft connection 242a can be optionally set between the first conductive plate 20a and the static contact 1-0a. When the overload protection mechanism 2a is used for small current specifications (current value of 63A and below), the third soft connection 242a is not provided between the first conductive plate 20a and the static contact 1-0a to meet the heating requirements of the bimetallic strip 23a; when the overload protection mechanism 2a is used for large current specifications (current value of 63A and above), the first conductive plate 20a and the static contact 1-0a are connected through the third soft connection 242a, which ensures the heating requirements of the bimetallic strip 23a and the cut-off cross-section requirements of the soft connection. Further, as Figures 9A-9BAs shown in the drawings, the first connecting plate 22a is connected with the middle part of the first conductive plate 20a at one end and with one end of the bimetallic strip 23a at the other end; the overload protection mechanism 2a further comprises an adjusting screw 21a which is arranged on the first conductive plate 20a and is threadedly connected with the first conductive plate 20a, and one end of the adjusting screw 21a is oppositely matched with the first connecting plate 21a. The adjusting screw 21a is arranged on the first conductive plate 20a, compared with the prior art of arranging the adjusting screw 21a on the circuit breaker housing 2, the position change of the adjusting screw 21a caused by the thermal deformation of the circuit breaker housing 2 is avoided, and the instability of the overload characteristic of the circuit breaker is caused.

[0065] It should be pointed out that the first connecting plate 22a is generally made of materials such as brass and carbon steel, which has a large internal resistance and a relatively long length, has a certain elasticity, and can well bear the force applied by the adjusting screw 21a, so as to adjust the position of the bimetallic strip 23a to adjust the overload characteristic of the circuit breaker; the first soft connection 240a, the second soft connection 241a and the third soft connection 242a are made of good conductors, have the characteristics of short length, large cross section and small internal resistance, form three current channels, and bear most of the current.

[0066] Preferably, as shown in Figures 14-29 As shown in the drawings, the miniature circuit breaker further comprises a PCB board 7a and a light guide 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 guide element 5a is oppositely matched with the signal lamp 8a, and the other end is oppositely matched with the observation hole. The light guide element 5a of the miniature circuit breaker can transmit the light emitted by the signal lamp 8a to the observation hole, which is convenient for the user to observe the lighting state of the signal lamp 8a, so as to quickly prompt the user when overhauling, replacing the faulty miniature circuit breaker or finding a specific circuit breaker or judging the state of the circuit breaker (opening / closing / tripping), improving the work efficiency and ensuring the personal safety of the user.

[0067] It should be pointed out that the indicator lamp 8a can be set as an indicator lamp for indicating the opening / closing state, fault state and the like of the miniature circuit breaker, or for specific indication according to the control command.

[0068] Preferably, as shown in Figure 16 , 20 , 28-29, the light guide 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. Further, as shown in Figure 16 , 20 , 28-29, the direction of the light of the signal lamp 8a entering the light guide element 5a is a first direction, the direction of the light of the signal lamp 8a exiting the light guide element 5a is a second direction, and the first direction is perpendicular to the second direction. Preferably, as shown in Figure 16 ,20 The light guide element 5a includes 2n+1 reflecting surfaces, where n is a natural number, as shown in Figs. 28 and 29.

[0069] The following is an embodiment of the miniature circuit breaker.

[0070] As shown in Fig. 5, the miniature circuit breaker includes a circuit breaker housing 2, an operating button 1, an operating mechanism 4, a movable contact 1-1a and a stationary contact 1-0a arranged in the circuit breaker housing 2, 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. Figure 1 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 arranged in the circuit breaker housing 2 and is in sliding cooperation with the circuit breaker housing 2.

[0071] Preferably, as shown in Fig. 5, the operating button 1 is arranged at one end of the circuit breaker housing 2, and one end of the operating button 1 is arranged in the circuit breaker housing 2 and is in sliding cooperation with the circuit breaker housing 2. Figure 1 2 The first terminal 7 and the second terminal 3a are arranged at two ends of the circuit breaker housing 2, respectively, and the second terminal 3a and the operating button 1 are arranged side by side at one end of the circuit breaker housing 2.

[0072] Preferably, the first terminal 7 is the incoming terminal of the miniature circuit breaker, and the second terminal 3a is the outgoing terminal of the miniature circuit breaker. Figure 1 2 Further, as shown in Figs. 5, the miniature circuit breaker 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, and two second terminals 3a are arranged side by side at the other end of the circuit breaker housing 2.

[0073] Specifically, as shown in the direction of Fig. 5, the operating button 1 is arranged at one end of the circuit breaker housing 2, and one end of the operating button 1 is arranged in the circuit breaker housing 2 and is in sliding cooperation with the circuit breaker housing 2. Figure 1 2 The first terminal 7 and the second terminal 3a are arranged at two ends of the circuit breaker housing 2, respectively, and the second terminal 3a and the operating button 1 are arranged side by side at one end of the circuit breaker housing 2. Figure 1 2 ​​​​​The upper, lower, left and right sides of the miniature circuit breaker and the side facing the reader are the upper, lower, left and 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 shell 2, the lower end of the operating button 1 is inserted into the circuit breaker shell 2 and is in sliding fit with the circuit breaker shell 2; the second wiring end 3a and the first wiring end 7 are arranged at the upper and lower ends of the circuit breaker shell 2 respectively, the second wiring end 3a and the operating button 1 are arranged side by side at the upper end of the circuit breaker shell 2; the overload protection mechanism 2a and the operating mechanism 4 are arranged in the middle of the circuit breaker shell 2 in a front-to-back stacking manner, the arc extinguishing chamber 9 and the short-circuit protection mechanism 6 are arranged side by side and are located between the operating mechanism 4 and the first wiring end 7; the operating button 1 and the short-circuit protection mechanism 6 are opposite to each other and are located at the upper and lower sides of the operating mechanism 4 respectively, and the second wiring end 3a and the arc extinguishing chamber 9 are opposite to each other and are located at the upper and lower sides of the operating mechanism 4 respectively.

[0074] Preferably, as shown in Figure 1 and 10 , the miniature circuit breaker further comprises a partition plate 3, the circuit breaker shell 2 comprises a shell base, the operating mechanism 4 is arranged between the partition plate 3 and the shell base, and the overload protection mechanism 2a, the operating mechanism 4 and the shell base are arranged in sequence. Further, the miniature circuit breaker comprises two second wiring ends 3, which are arranged at the two sides of the partition plate 3 respectively.

[0075] Preferably, as shown in Figure 1 , 2 , 5, it is an embodiment of the operating mechanism 4, and specifically as follows: the operating mechanism 4 comprises a second connecting rod 45, a handle component 44, a rotating plate 43, a jump buckle component 42 and a lock buckle component 41, the handle component 44 and the rotating plate 43 are arranged in rotation on the circuit breaker shell 2 respectively, the lock buckle component 41 and the jump buckle component 42 are arranged in rotation on the rotating plate 43 respectively and are in lock fit, the handle component 44 is drivingly connected with the lock buckle component 41 through the second connecting rod 45, and the rotating plate 43 is drivingly connected with the static contact 1-0a.

[0076] It should be pointed out that the structure of the operating mechanism 4 is not limited to the above-mentioned one, and the operating mechanism of the existing multi-connecting rod type, which realizes the balance of the multi-connecting rod through the lock fit of at least two components, can be applied to the miniature circuit breaker of the present application.

[0077] Preferably, as shown in Figure 1 , 2 , 5, the jump buckle component 42 comprises a jump buckle driven column 40 which is drivingly matched with the overload protection mechanism 2a and the short-circuit protection mechanism 6 respectively, when the miniature circuit breaker appears an overload fault or a short-circuit fault, the overload protection mechanism 2a or the short-circuit protection mechanism 6 drives the jump buckle component 42 to rotate through the jump buckle driven column 40 and releases the lock fit with the lock buckle component 41, and the miniature circuit breaker is tripped. Further, as shown in Figure 1 and2 As shown, the middle part of the tripping latch actuated column 40 is connected to the tripping latch 42, one end of the tripping latch actuated column 40 is driven and matched with the overload protection mechanism 2a, and the other end is driven and matched with the short circuit protection mechanism 6. Figure 1 、 2 As shown in Figures 5 and 6, the overload protection mechanism 2a and the short-circuit protection mechanism 6 are directly driven to cooperate with the tripping activated column 40 from one side thereof, and the tripping activated column 40 drives the tripping member 42 to rotate and release the locking cooperation with the locking member 41.

[0078] Specifically, such as Figure 1 and 2 Direction shown, Figure 1 、 2 The upper, lower, left and right sides and the side facing the reader are the upper, lower, left, right and front sides of the small circuit breaker; the front end of the tripping activated column 40 is driven and cooperated with the overload protection mechanism 2a, and the rear end is driven and cooperated with the short-circuit protection mechanism 6; the overload protection mechanism 2a and the short-circuit protection mechanism 6 are both driven and cooperated with it from the lower side of the tripping activated column 40.

[0079] Preferably, Figure 1 、 2 As shown in Figures 5 and 5 , the overload protection mechanism 2a includes a bimetallic strip 23a driven by a tripping activated column 40.

[0080] Preferably, Figure 1 、 2 As shown, the short-circuit protection mechanism 6 is a snap-on electromagnetic mechanism, including an armature 60 driven by a tripping driven column 40. Figure 1 and 2 As shown, the miniature circuit breaker of the present invention further comprises a driving link 5, the middle portion of which is rotatably arranged on the circuit breaker housing 2, and the two ends of which are respectively driven and matched with the armature 60 and the tripping driven column 40.

[0081] Preferably, Figure 5 As shown, the short-circuit protection mechanism 6 is a direct-acting electromagnetic mechanism, including a push rod driven by a tripping driven column 40 .

[0082] Preferably, Figure 1 、 2, 5, 9A, which is a first embodiment of the overload protection mechanism 2a, is as follows: the overload protection mechanism 2a comprises a first conductive plate 20a, a first connecting plate 22a and a bimetallic strip 23a, and the first connecting plate 22a is connected to the first conductive plate 20a and the bimetallic strip 23a at both ends thereof; the bimetallic strip 23a is connected to the first conductive plate 20a through a first soft connection 240a and connected to the static contact 1-0a through a second soft connection 241a; and the first conductive plate 20a is connected to the static contact 1-0a through a third soft connection 242a. Further, as shown in Figure 9A , 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. Further, as shown in Figure 9A , the first connecting plate 22a and the bimetallic strip 23a are in a C-shaped structure as a whole, and the opening side of the C-shaped structure faces the operating mechanism 4, and 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 the external load through the second terminal 3a, and the other end is opposite to one end of the static plate 1-00a of the static contact 1-0a.

[0083] Preferably, as shown in Figure 9A , the overload protection mechanism 2a further comprises an adjusting screw 21a, which is arranged on the first conductive plate 20a and is threadedly connected thereto, and one end of the adjusting screw 21a is opposite to the first connecting plate 21a. Further, as shown in Figure 1 , the circuit breaker housing 2 further comprises an operating hole 22 corresponding to the other end of the adjusting screw 21a, and the user can rotate the adjusting screw 21a through the operating hole 22 to adjust the overload protection characteristics of the overload protection mechanism.

[0084] Preferably, as shown in Figure 1 , 2 , 9A, the first conductive plate 20 is in a Z-shaped structure, comprising a first conductive plate connecting portion connected to the second terminal 3a, a second conductive plate connecting portion connected to the first connecting plate 22a, and a third conductive plate connecting portion connected to the static contact 1-0a through the third soft connection 242a; the second conductive plate connecting portion is connected to the first conductive plate connecting portion and the third conductive plate connecting portion at both ends thereof by bending, and the first conductive plate connecting portion and the third conductive plate connecting portion are respectively located on both sides of the second conductive plate connecting portion. As shown in Figure 9A , the adjusting screw 21a is arranged on the second conductive plate connecting portion and is threadedly connected thereto, and one end of the adjusting screw 21a is connected to the middle of the first connecting plate 22a.

[0085] Preferably, as shown in 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 with the bimetallic strip 23a through a second flexible connection 241a, and the first conductive plate 20a is connected with the static contact plate 1-00a through a third flexible connection 242a.

[0086] Specifically, as shown by the direction of Figure 1 and 2 , the overload protection mechanism 2a is assembled into the circuit breaker housing 2 and is drivingly connected with the operating mechanism 4; the upper end of the first conductive plate 20a is connected with 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 is connected with the static contact plate 1-00a through the third flexible connection 242a; the upper end of the first connecting plate 22a is connected with the middle part of the first conductive plate 20a, and the lower end is connected with the upper end of the bimetallic strip 23a, the adjusting screw 21a is arranged at the middle part of the first conductive plate 20a and is threadedly connected with the first conductive plate 20a, and the right end of the adjusting screw 21a is opposite to the middle part of the first connecting plate 22a, and the circuit breaker housing 2 is provided with an operating hole 22 opposite to the left end of the adjusting screw 21a; the lower end of the bimetallic strip 23a is located below the jump buckle driving column 40 of the operating mechanism 4 and is drivingly connected with the jump buckle driving column 40.

[0087] Preferably, as shown by the direction of Figure 9B , the second embodiment of the overload protection mechanism 2a is different from the first embodiment in that the third flexible connection 242a is not arranged between the first conductive plate 20a and the static contact 1-0a.

[0088] Preferably, as shown by the direction of Figures 1-2 , 6-8, the short-circuit protection mechanism 6a of the miniature circuit breaker is a clapping type electromagnetic mechanism, and the following is an embodiment thereof: the short-circuit protection mechanism 6 includes a magnetic yoke 61, an armature 60, an armature tension spring 63, and a conductive plate 64, the conductive plate 64 is arranged at the middle part of the magnetic yoke 61, one end of the armature 60 is rotatably arranged, the armature 60 is opposite to the magnetic yoke 61, one end of the armature tension spring 63 is connected with the armature 60 and the other end is connected with the circuit breaker housing 2.

[0089] Preferably, as shown by the direction of Figures 1-2 , 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 shown by the direction of Figure 7 , when the armature 60 is attracted to the magnetic 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°.

[0090] Preferably, as shown by the direction of Figure 6 , the armature 60 includes a plurality of spring hook holes, the plurality of spring hook holes are arranged side by side and at intervals, and from the first to the last spring hook hole, the spring hook holes are sequentially offset in the direction of the armature tension spring 63.

[0091] Preferably, as shown in Figure 1 , 2 , when the short-circuit protection mechanism 6 is assembled into the circuit breaker housing 2, the axis of the magnetic yoke 61 is parallel to the axial direction (the length direction of the circuit breaker housing 2) of the circuit breaker housing 2.

[0092] Preferably, as shown in Figure 8 , for an embodiment of the armature 60, the magnetic yoke 61, and the combination of the armature 60 and the magnetic yoke 61, specifically: the magnetic yoke 61 is a U-shaped structure, including a magnetic yoke bottom plate 612 and a pair of magnetic yoke arms 611, the two magnetic yoke arms 611 are respectively connected to the two ends of the magnetic yoke bottom plate 612 by bending, and each magnetic yoke arm 611 is provided with an armature clamping groove 610 at one end, and the two armature clamping grooves 610 are located at the same end of the magnetic yoke 61; the armature 60 includes two armature support arms 600 arranged side by side and spaced apart at one end thereof, and each armature support arm 600 is provided with a limiting square groove 6000 at one corner thereof, and the two limiting square grooves 6000 are respectively located at the two ends of the two armature support arms 600 and are matched with the two armature clamping grooves 610. Further, as shown in Figure 8 , the two armature support arms 600 are integrally formed in a convex shape, one end of the convex shape with a relatively narrow width is limited between the two magnetic yoke arms 611, and the two shoulder portions of the convex shape are clamped in the two armature clamping grooves 610.

[0093] Preferably, as shown in Figure 8 , the armature 60 includes an opening 65 arranged at the middle portion thereof, and three spring hanging holes are arranged on one side of the opening 65, which are a first spring hanging hole 65-0, a second spring hanging hole 65-1, and a third spring hanging hole 65-2, and the three spring hanging holes are arranged side by side and spaced apart along the length direction of the armature 60. Further, as shown in Figure 8 , one end of each of the spring hanging holes is in communication with the opening 65, facilitating the entry or removal of the armature tension spring 63 into or out of the spring hanging hole.

[0094] Specifically, as shown in Figure 1 and 2 , when the short-circuit protection mechanism 6 is assembled into the circuit breaker housing 2 and is driven in cooperation with the operating mechanism 4: the short-circuit protection mechanism 6 is arranged below the operating mechanism 4, the drive link 5 is arranged between the operating mechanism 4 and the short-circuit protection mechanism 6, and the upper and lower ends thereof are respectively driven in cooperation with the jump buckle driven column 40 of the operating mechanism 4 and the armature 60 of the short-circuit protection mechanism 6; when the small circuit breaker is in short-circuit failure, the armature 60 swings counterclockwise, drives the drive link 5 to swing clockwise, and the drive link 5 drives the jump buckle driven column 40 to rotate from the lower side thereof. Further, as shown in Figure 1 and 2 , the drive link 5 includes a link main body and a link shaft mounting portion arranged at one side of the middle portion of the link main body.

[0095] Preferably, as shown in Figure 1 , 2 , 5, 11-13, the miniature circuit breaker of the present application further comprises a signal output assembly 8, the operating 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 operating button 1 are located at the same end of the circuit breaker housing 2, 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 and spaced apart, and the two first terminals 7 are respectively used for connecting the power supply L pole and the N pole.

[0096] Preferably, as shown in Figures 11-13A , it is the first embodiment of the signal output assembly 8, in particular: the signal output assembly 8 comprises 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 arranged on the printed circuit board 80 and electrically connected with the printed circuit board 80 respectively; 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 for electrically connecting with an output terminal, and the first signal terminal 83 and the second signal terminal 82 are used for outputting electrical signals, in this embodiment, the second terminal 3a is used as the output terminal, the first terminal 7 is connected with the movable contact 1-1a, and the contact terminal 81 is connected with the fixed contact 1-0a. Further, as shown in Figure 1 and 3 , the miniature circuit breaker of the present application further comprises an arc striking plate 4a arranged at one side of the arc extinguishing chamber 9, one end of the arc striking plate 4a is connected with the fixed contact 1-0a, and the other end is connected with the contact terminal 81. It should be pointed out 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 achieved through the printed circuit board 80, which is a routine technical means for those skilled in the art, and will not be described here.

[0097] Preferably, as shown in Figure 13A , the anode of the diode 84 is connected with the contact terminal 81, and the cathode is connected with the second signal terminal 82.

[0098] Preferably, as shown in Figures 11-12 , the first signal terminal 83 and the second signal terminal 82 are arranged side by side and spaced apart on one side (front side and 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 (opposite side or front side) of the printed circuit board 80.

[0099] Preferably, as shown in Figures 11-12As shown in the figure, the first signal terminal 83, the second signal terminal 82 and the contact terminal 81 are all plug-in terminals. Further, as shown in the figure, Figures 11-12 As shown in the figure, the first signal terminal 83, the second signal terminal 82 and the contact terminal 81 are all plug-in terminals. Further, as shown in the figure, Figures 11-12 As shown in the figure, the direction of the wire or the conductive plate inserted into the first signal terminal 83 and the second signal terminal 82 is perpendicular to the direction of the wire or the conductive plate inserted into the contact terminal 81.

[0100] Preferably, as shown in the figure, Figures 1-4 As shown in the figure, when the signal output assembly 8 is assembled to the circuit breaker housing 2, the printed circuit board 80 is vertically inserted into the circuit breaker housing 2 along the thickness direction of the circuit breaker, and the printed circuit board 80 is perpendicular to the axial direction (the length direction) 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 plug-in direction of the first signal terminal 83 and the second signal terminal 82 is parallel to the length direction of the circuit breaker housing 2; the plug-in direction of the contact terminal 81 is perpendicular to (or parallel to) the plug-in direction of the first signal terminal 83 and the second signal terminal 82, and the plug-in direction of the printed circuit board 80 is the same as the insertion direction of the printed circuit board 80, that is, 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 circuit breaker housing 2 at the same time.

[0101] Further, as shown in the figure, Figures 3-4 As shown in the figure, the circuit breaker housing 2 comprises a signal output assembly mounting structure, which is located between the two first terminals 7. Specifically, the signal output assembly mounting structure comprises a pair of circuit board slots 2-80 arranged in opposite directions, a first assembly assembly space 2-81 and a second assembly assembly space, the two ends of the printed circuit board 80 are respectively inserted into the two circuit board slots 2-80, and the first assembly assembly space 1-81 and the second assembly assembly space are respectively located on the two 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 assembly assembly space 2-81, the first signal terminal 83 and the second signal terminal 82 are both located in the second assembly assembly space, and the end of the arc plate 4a matched with the contact terminal 81 extends into the first assembly assembly space 2-81. Further, as shown in the figure, Figure 4 As shown in the figure, the insertion port of each circuit board slot 2-80 is provided with a guide slope to facilitate the insertion of the printed circuit board 80, and the inner end of the circuit board slot 2-80 is provided with a positioning protruding rib 2-800, so that the printed circuit board 80 is inserted into the circuit board slot 2-80 to abut against the positioning protruding rib 2-800, thereby ensuring that the printed circuit board 80 is installed in place; as shown in the figure,Figure 4 As shown in the figure, the second assembly space comprises two terminal assembly cavities arranged side by side, and terminal partition ribs 82-83 are arranged between the two terminal assembly cavities. The bottom of each terminal assembly cavity is provided with a plurality of terminal support ribs 2-820, and each terminal assembly cavity is matched with one signal socket 2-82 arranged on the circuit breaker shell 2.

[0102] Preferably, as shown in the figure, Figure 13B As shown in the figure, the second embodiment of the signal output assembly 8 is different from the first embodiment in that the second signal terminal 82 is connected to the contact terminal 81 through a series-connected diode 84 and a current-limiting resistor 85, and the first signal terminal 81 is connected to the contact terminal 81 through a current-limiting resistor 85 (the first signal terminal 81 is connected to the node between the current-limiting resistor 85 and the contact terminal 81).

[0103] Preferably, as shown in the figure, Figures 14-29 As shown in the figure, the miniature circuit breaker further comprises a PCB board 7 and a conducting structure. The PCB board 7 is arranged in the circuit breaker shell 2 and comprises a signal lamp 8a. The conducting structure comprises a light guide element 5a and an observation hole. One end of the light guide element 5a is matched with the signal lamp 8a, and the other end is matched with the observation hole. Further, as shown in the figures, Figure 15 , 16 , 19, 20, 24, 25, 27-29, the light guide element 5a comprises 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 being reflected at least once. Further, as shown in the figures, Figure 15 , 16 , 19, 20, 24, 25, 27-29, after the light emitted by the signal lamp 8a enters the light guide element 5a, the light is emitted from the light guide element 5a after being reflected 2n+1 times, where n is a natural number, and n is preferably 1 or 3.

[0104] Preferably, as shown in the figure, Figure 15 , 16 , 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 a first direction, and the direction in which the light emitted by the signal lamp 8a exits the light guide element 5a is a 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.

[0105] Preferably, the light guide element 5a is a total reflection light guide element, which can transmit most of the light emitted by the signal lamp 8a into the observation hole.

[0106] Preferably, as shown in the figure, Figures 14-25As shown, the first embodiment of the conducting structure is specifically: the observation hole includes a button observation hole 101 arranged on the operation button 1, the light guide element 5a is linked with the operation button 1, one end is matched with the signal lamp 8a, and the other end is matched with the button observation hole 101. Further, as shown in Figure 15 、 19 , 24, 25, the operation button 1 includes a first assembly cavity 100 arranged in the middle part 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 arranged at one end of the operation button 1 and communicates with the first assembly cavity 100.

[0107] Preferably, as shown in Figure 16 and 20 , the first embodiment of the light guide element 5a is specifically: the light guide element 5a includes a light guide element body 5-0a and a first reflection surface 51a, a second reflection surface 52a, a third reflection surface 53a and a fourth reflection surface 54a arranged on the light guide element body 5-0a; the first reflection surface 51a, the second reflection surface 52a, the third reflection surface 53a and the fourth reflection surface 54a are all inclined surfaces and all tilt in the same direction; the first reflection surface 51a, the second reflection surface 52a and the third reflection surface 53a are all arranged on one side of the light guide element body 5-0a and are sequentially and spaced apart along the axial direction of the light guide element body 5-0a, and the first reflection surface 51a, the second reflection surface 52a and the third reflection surface 53a are sequentially offset to one side of the light guide element 5a; the fourth reflection surface 54a is arranged on the other side of the light guide element body 5-0a, and the third reflection surface 53a and the fourth reflection surface 54a are arranged on the same end of the light guide element body 5-0a. Further, as shown in Figure 15 and 16 , the miniature circuit breaker of the present application is in the open state, the light emitted from the signal lamp 8a enters the light guide element body 5-0a from one end of the light guide element body 5-0a, and then is reflected by the first reflection surface 51a, the fourth reflection surface 54a and the third reflection surface 53a in sequence, and then is emitted from the other end of the light guide element body 5-0a and can be seen through the button observation hole 101; as shown in Figure 19 and 20 , the miniature circuit breaker of the present application is in the closed state, the operation button 1 drives the light guide element 5a to move downward, the light emitted from the signal lamp 8a enters the light guide element body 5-0a from one end of the light guide element body 5-0a, and then is reflected by the second reflection surface 52a, the fourth reflection surface 54a and the third reflection surface 53a in sequence, and then is emitted from the other end of the light guide element 5-0a and can be seen through the button observation hole 101.

[0108] Specifically, as shown in Figures 15-16, 19-20, 24-25, the signal lamp 8a is arranged at the left lower end of the light guide element 5a, and the upper end of the light guide element 5a is matched with the button observation hole 101; as shown in Figure 19 and 24 , when the operating button 1 is pressed to close the miniature circuit breaker, the light guide element 5a moves downward with the operating button 1, and the second emitting surface 52a is opposite to the signal lamp 8a; as shown in Figure 15 and 25 , when the operating button 1 is pulled to open the miniature circuit breaker, the light guide element 5a moves upward with the operating button 1, and the first reflecting surface 51a is opposite to the signal lamp 8a; the light emitted by the signal lamp 8a always enters the light guide element 5a from the direction perpendicular to the axial direction of the light guide element 5a, and exits from the direction parallel to the axial direction of the light guide element 5a.

[0109] Preferably, as shown in Figure 15 , 17 -19, 21, 22, the miniature circuit breaker further comprises an indicating element 6a arranged in the first assembly cavity 100 for indicating the opening / closing state of the miniature circuit breaker, the indicating element 6a is linked with the operating button 1, and the indicating element 6a comprises a light-transmitting indicating part 61-62a, the indicating part 61-62a comprises an opening indicating surface 61a and a closing indicating 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, the closing indicating surface 62a is visible through the button observation hole 101 when the miniature circuit breaker is in the closing state, and the opening indicating surface 61a is visible through the button observation hole 101 when the miniature circuit breaker is in the opening state. Further, as shown in Figure 17 , 18 , 21, 22, the miniature circuit breaker further comprises a driving element 9a arranged in the circuit breaker housing 1, the driving element 9a comprises an indicating element driving table 90a; the indicating element 6a further comprises an indicating element rotating shaft 60a and an indicating element driven part 63a, the indicating element rotating shaft 60a and the indicating part 61-62a are respectively located at two ends of the indicating element 6a, the indicating element driven part 63a is connected with the indicating element rotating shaft 60a, the indicating element 6a is rotatably arranged through the indicating element rotating shaft 60a, and the indicating element driving table 90a drives the indicating element 6a to rotate through the indicating element driven part 63a. Further, the indicating element 6a is rotatably connected with the operating button 1 through the indicating element rotating shaft 60a, or the indicating element 6a is rotatably connected with the light guide element 5a through the indicating element rotating shaft 60a. Further, as shown in Figure 15 , 17 -19, 21-22, the light guide element 5a comprises an indicating element mounting shaft slot 50a, the indicating element rotating shaft mounting slot 50a is arranged between the second reflecting surface 52a and the third reflecting surface 53a, and is located at the same side of the second reflecting surface 52a and the third reflecting surface 53a of the light guide element 5a, and the indicating element rotating shaft 60a is rotatably arranged in the indicating element rotating shaft mounting slot 50a.

[0110] Preferably, as shown in Figures 17-18 , 21-22, 23, the indicating part driven part 63a is a C-shaped structure, including closing drive part 630a and opening drive part 631a respectively arranged at both ends thereof, the middle part of the indicating part driven part 63a is connected with the indicating part rotating shaft 60a, the indicating part drive platform 90a is located in the middle part of the C-shaped structure of the indicating part driven part 63a, and is driven cooperatively with the closing drive part 630a and the opening drive part 631a respectively, the indicating part drive platform 90a drives the closing drive part 630a to make the indicating part 6a rotate, the closing indicating surface 62a is visible through the button indicating hole 101, the indicating part drive platform 90a drives the opening drive part 631a to make the indicating part 6a rotate, and the opening indicating surface 61a is visible through the button indicating hole 101. The indicating part drive platform 90a and the indicating part driven part 63a are driven cooperatively in a mechanical mode, the action is reliable and stable, and the indicating part 6a switches the closing indicating surface 62a and the opening indicating surface 61a in a swinging mode, the action amplitude is large, and the opening / closing state of the miniature circuit breaker is reliably and accurately indicated, thereby improving the user's electricity safety.

[0111] Preferably, as shown in Figure 23 , it is an embodiment of the indicating part 6a, in particular: the indicating part 6a includes indicating part 61-62a, indicating part connecting part 64a, indicating part rotating shaft 60a and indicating part driven part 63a, the indicating part 61-62a and the indicating part connecting part 64a are connected with the indicating part rotating shaft 60a respectively, one end of the indicating part rotating shaft 60a is connected with the indicating part connecting part 64a, and the other end is connected with the indicating part driven part 63a, the indicating part 61-62a includes closing indicating surface 62a and opening indicating surface 61a arranged side by side, the two ends of the opening indicating surface 61a are connected with the indicating part connecting part 64a and the closing indicating surface 62a respectively, the indicating part driven part 63a is a C-shaped structure, the middle part of which is connected with the indicating part rotating shaft 60a, and includes closing drive part 630a and opening drive part 631a respectively arranged at both ends thereof. Further, as shown in Figure 23 , the indicating part connecting part 64a is an L-shaped structure, the indicating part 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 indicating part driven part 63a, and the closing drive part 630a is arranged close to the indicating part 61-62.

[0112] Preferably, as shown in Figures 26-29 , it is the second embodiment of the conducting structure, and the difference from the first embodiment is that the observation hole includes shell observation hole 21 arranged on the circuit breaker shell 2, and the light guide element 5a is fixedly arranged in the circuit breaker shell 2, one end of which is cooperatively matched with the signal lamp 8a, and the other end is cooperatively matched with or inserted into the shell observation hole 21.

[0113] Preferably, as shown in Figure 26 , 27 , 29, the circuit breaker housing 1 includes a circuit breaker operation interface 20 arranged at one end thereof, a housing observation hole 21 arranged on the circuit breaker operation interface 20, and the operation button 1 arranged in the circuit breaker housing 2 at one end thereof and protruding outside the circuit breaker operation interface 20 at the other end thereof. Further, as shown in Figure 26 and 27 , the compact circuit breaker further includes a first wiring hole 203 and a first disconnection hole 2030 arranged on the circuit breaker operation interface 20, the first wiring hole 203 and the first disconnection hole 2030 being matched one-to-one, and the first wiring hole 203 being matched one-to-one with the first wiring end 3a.

[0114] As shown in Figures 27-28 , the second embodiment of the light guide element 5a includes a first reflecting surface 51a arranged at one end thereof, and the indicator lamp 8a is arranged at one side of the light guide element 5a. After the light emitted by the indicator lamp 8a enters the light guide element 5a, the light is reflected by the first reflecting surface 51a, and then exits the light guide element 5a and can be observed through the housing observation hole 21.

[0115] As shown in Figure 29 and 30 , the third embodiment of the light guide element 5a includes a first reflecting surface 51a, a second reflecting surface 52a, and a third reflecting surface 53a, all of which are inclined surfaces and are parallel to each other. The first reflecting surface 51a and the third reflecting surface 53a are arranged at the same side of the light guide element 5a and are sequentially offset to one side of the light guide element 5a. The first reflecting surface 51a and the third reflecting surface 53a are arranged at two ends of the light guide element 5a, respectively. The second reflecting surface 52a is arranged at the other side of the light guide element 5a 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 guide element 5a. The indicator lamp 8a is arranged at one side of the light guide element 5a. After the light emitted by the indicator lamp 8a enters the light guide element 5a, the light 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 guide element 5a and can be observed through the housing observation hole 21.

[0116] The above is a further detailed description of the present application in combination with specific preferred embodiments, and the specific implementation of the present application should not be limited to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, a number of simple deductions or substitutions can be made without departing from the concept of the present application, and all of these should be considered as falling within the protection scope of the present application.

Claims

1. A miniature circuit breaker comprising a circuit breaker housing (2), an operating button (1), a second terminal (3a), and an overload protection mechanism (2a) and an operating mechanism (4) respectively arranged in the circuit breaker housing (2); the operating mechanism (4) comprising a locking member (41) and a tripping member (42) respectively pivotally arranged and locked in engagement; characterized in that: The overload protection mechanism (2a) and the operating mechanism (4) are stacked front and back in the middle of the circuit breaker housing (2); the operating button (1) is arranged at one end of the circuit breaker housing (2) and is located on the upper side of the operating mechanism (4); the second terminal (3a) and the operating button (1) are located at the same end of the circuit breaker housing (2) and are arranged side by side on the left and right; the tripping member (42) includes a tripping actuated column (40); the overload protection mechanism (2a) includes a first connecting plate (22a) and a bimetallic strip (23a); the upper end of the bimetallic strip (23a) is connected to the first connecting plate (22a) and the lower end is located on the lower side of the tripping actuated column (40) and is driven and matched with it; the first connecting plate (22a) and the bimetallic strip (23a) are in a C-shaped structure as a whole, and the opening of the C-shaped structure faces the operating mechanism (4).

2. The miniature circuit breaker according to claim 1, characterized in that: The miniature circuit breaker further comprises an arc extinguishing chamber (9) and a short-circuit protection mechanism (6), wherein the arc extinguishing chamber (9) and the short-circuit protection mechanism (6) are arranged side by side on the lower side of the operating mechanism (4).

3. The miniature circuit breaker according to claim 2, characterized in that: The miniature circuit breaker further comprises a first terminal (7), wherein the first terminal (7) and a second terminal (3a) are respectively arranged at two ends of the circuit breaker housing (2).

4. The miniature circuit breaker according to claim 3, characterized in that: The arc extinguishing chamber (9) and the second connection terminal (3a) are opposite to each other and are respectively located on both sides of the overload protection mechanism (2a); the operating button (1) and the short-circuit protection mechanism (6) are opposite to each other and are respectively located on both sides of the operating mechanism (4).

5. The miniature circuit breaker according to claim 3, characterized in that: The miniature circuit breaker further comprises a signal output assembly (8) arranged in the circuit breaker housing (2); the signal output assembly (8) and the first wiring terminal (7) are located at the same end of the circuit breaker housing (2); and the signal output assembly (8) is arranged between the two first wiring terminals (7).

6. The miniature circuit breaker according to claim 5, characterized in that: The signal output component (8) comprises a printed circuit board (80) and a first signal terminal (83), a second signal terminal (82), and a contact terminal (81) respectively arranged on the printed circuit board (80); the first signal terminal (83) and the second signal terminal (82) are arranged side by side and spaced apart on one side of the printed circuit board (80), and the contact terminal (81) is arranged on the other side of the printed circuit board (80); the contact terminal (81) is electrically connected to the static contact (1-0a) of the miniature circuit breaker.

7. The miniature circuit breaker according to claim 6, characterized in that: The signal output component (8) further includes a current-limiting resistor (85) and a diode (84), wherein 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).

8. The miniature circuit breaker according to claim 7, characterized in that: The current limiting resistor (85), the diode (84) and the contact terminal (81) are arranged on the same side of the printed circuit board (80).

9. The miniature circuit breaker according to claim 6, characterized in that: The first signal terminal (83), the second signal terminal (82) and the contact terminal (81) are all plug-in terminals.

10. The miniature circuit breaker according to claim 1, wherein: The miniature circuit breaker further comprises a partition (3), the circuit breaker housing (2) comprises a housing base, the partition (3) is connected to the housing base, and the operating mechanism (4) is arranged between the partition (3) and the housing base.

11. The miniature circuit breaker according to claim 10, characterized in that: The operating mechanism (4) further comprises a rotating plate (43), a handle member (44) and a second connecting rod (45); the rotating plate (43) and the handle member (44) are respectively pivotally arranged on the circuit breaker housing (2); the locking member (41) and the tripping member (42) are respectively pivotally arranged on the rotating plate (43); the handle member (44) is drivingly connected to the locking member (41) via the second connecting rod (45); the miniature circuit breaker further comprises an operating button (1); one 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 operating button (1) is drivingly connected to the handle member (44) via the first connecting rod (46), and drives the handle member (44) to rotate.

12. The miniature circuit breaker according to claim 11, characterized in that: The jumper (42) and the rotating plate (43) are coaxially arranged, and the two ends of the rotating shaft of the rotating plate (43) and the two ends of the rotating shaft of the handle (44) are respectively limitedly matched with the shell base and the partition (3).

13. The miniature circuit breaker according to claim 2, characterized in that: The tripping activated column (40) is driven and matched with the short-circuit protection mechanism (6).

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