breaker

Abstract

The present invention relates to the field of low-voltage electrical appliances, and in particular to a circuit breaker, wherein a button mechanism drives the circuit breaker to close / open via an operating mechanism, and an electric mechanism drives the circuit breaker to close / open via the button mechanism and / or the operating mechanism; the protection mechanism cooperates with the operating mechanism to trigger the circuit breaker to trip; the incoming terminal and the outgoing terminal are respectively arranged at two ends of the circuit breaker housing; the operating mechanism is arranged in the middle of the circuit breaker housing; the arc extinguishing system and the protection mechanism are arranged side by side between the operating mechanism and the incoming terminal; the electric mechanism is arranged between the outgoing terminal and the operating mechanism, and the electric mechanism and the outgoing terminal are arranged on the same side of the button mechanism; the current sampling device is arranged between the protection mechanism and the incoming terminal, and the two ends of the sampling device are respectively electrically connected to the protection mechanism and the incoming terminal; the circuit breaker of the present invention has a reasonable internal layout, a compact overall structure, and high safety.

Description

Technical Field

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

[0002] Existing plug-in circuit breakers often have the following problems:

[0003] First, the existing circuit breaker electric mechanism achieves automatic closing by driving the handle mechanism, and automatically opens the circuit breaker by driving the handle mechanism or by driving the lock of the operating mechanism. The corresponding matching mechanism is easy to wear, and the structure is relatively complex in order to achieve mutual non-interference between automatic opening and closing and manual opening and closing. In addition, the motor control of the existing circuit breaker electric mechanism is processed by a position sensor and a chip. The position sensor transmits the closing and opening positions of the circuit breaker to the chip, and the chip controls the motor to rotate forward or reverse to achieve closing, opening, and returning to the initial position (that is, without affecting the manual opening and closing positions of the circuit breaker). The chip is easily affected by external interference, resulting in unreliable position detection and affecting the reliability of the circuit breaker operation.

[0004] Second, the electric mechanism of the existing circuit breaker relies on hard gear transmission. After long-term use, the structural parts are prone to wear, which often leads to improper transmission, which manifests as the circuit breaker not closing or opening properly.

[0005] 3. The existing circuit breaker is inconvenient to operate when switching between manual and automatic working modes, and the working reliability of the manual-automatic switching device is not high.

[0006] Fourth, the overall spatial dimensions of existing circuit breakers are too large, which does not conform to the trend and requirements of miniaturization development of circuit breakers.

[0007] 5. The current sampling device of the existing circuit breaker is implemented by a manganese copper shunt. The manganese copper shunt is large in size and has a high temperature rise, which affects the design and layout of the circuit breaker. Summary of the Invention

[0008] The object of the present invention is to overcome the defects of the prior art and provide a circuit breaker with a reasonable internal layout, a compact overall structure and high safety.

[0009] To achieve the above object, the present invention adopts the following technical solutions:

[0010] A circuit breaker includes a circuit breaker housing 1, and a button mechanism 2, an electric mechanism 3, an operating mechanism 5, a protection mechanism, an arc extinguishing system 7, a current sampling device 112, an incoming terminal 880, and an outgoing terminal 881 arranged in the circuit breaker housing 1; the button mechanism 2 drives the circuit breaker to close / open through the operating mechanism 5; the electric mechanism 3 drives the circuit breaker to close / open through the button mechanism 2 and / or the operating mechanism 5; the protection mechanism cooperates with the operating mechanism 5 to trigger the circuit breaker to trip; the incoming terminal 880 and the outgoing terminal 881 1 are respectively arranged at both ends of the circuit breaker housing 1; the operating mechanism 5 is arranged in the middle of the circuit breaker housing 1; the arc extinguishing system 7 and the protection mechanism are arranged side by side between the operating mechanism 5 and the incoming terminal 880; the electric mechanism 3 is arranged between the outgoing terminal 881 and the operating mechanism 5, and the electric mechanism 3 and the outgoing terminal 881 are arranged on the same side of the button mechanism 2; the current sampling device 112 is arranged between the protection mechanism and the incoming terminal 880, and the two ends of the current sampling device 112 are electrically connected to the protection mechanism and the incoming terminal 880 respectively.

[0011] Preferably, one end of the button mechanism 2 protrudes outside the end of the circuit breaker housing 1 where the outlet terminal 881 is provided.

[0012] Preferably, the circuit breaker includes a short-circuit protection mechanism 6 and an overload protection mechanism 110, the protection mechanism is the short-circuit protection mechanism 6, the arc extinguishing system 7 and the short-circuit protection mechanism 6 are arranged side by side, and the operating mechanism 5 and the overload protection mechanism 110 are arranged side by side in the middle of the circuit breaker housing 1; or, the protection mechanism is the overload protection mechanism 110, the arc extinguishing system 7 and the overload protection mechanism 110 are arranged side by side, and the operating mechanism 5 and the short-circuit protection mechanism 6 are arranged side by side in the middle of the circuit breaker housing 1.

[0013] Preferably, the protection mechanism is a short-circuit protection mechanism 6, and the circuit breaker also includes an overload protection mechanism 110. The operating mechanism 5 and the overload protection mechanism 110 are arranged side by side in the middle of the circuit breaker housing 1, the arc extinguishing system 7 and the short-circuit protection mechanism 6 are arranged side by side, the overload protection mechanism 110 and the arc extinguishing system 7 are located on one side of the circuit breaker housing 1, and the operating mechanism 5 and the short-circuit protection mechanism 6 are located on the other side of the circuit breaker housing 1; the current sampling device 112 is arranged between the short-circuit protection mechanism 6 and the incoming terminal 880, the incoming terminal 880 includes an L-pole incoming terminal, and the current sampling device 112 is connected in series between the short-circuit protection mechanism 6 and the L-pole incoming terminal.

[0014] Preferably, the circuit breaker also includes a circuit board 111 connected to the electric mechanism 3, the button mechanism 2, the electric mechanism 3, the operating mechanism 5, the overload protection mechanism 110, the arc extinguishing system 7 and the current sampling device 112 are arranged on one side of the circuit board 111, and the bottom plate of the circuit breaker housing 1 is located on the other side of the circuit board 111.

[0015] Preferably, the circuit breaker housing 1 further includes a sampling device assembly slot 112 a , and two ends of the sampling device assembly slot 112 a are respectively opposite to the L-pole incoming terminal and the short-circuit protection mechanism 6 .

[0016] Preferably, the short-circuit protection mechanism 6 includes an electromagnetic tripping mechanism, and the overload protection mechanism 110 includes a bimetallic strip.

[0017] Preferably, the current sampling device 112 is a manganese-copper shunt, comprising a manganese-copper alloy portion 112-1 and a current-carrying copper strip, wherein two current-carrying copper strips are respectively connected to both ends of the manganese-copper alloy portion 112-1; the thickness of the manganese-copper alloy portion 112-1 is greater than the thickness of the current-carrying copper strip.

[0018] Preferably, the width of the manganese-copper alloy portion 112 - 1 is less than or equal to the width of the current-carrying copper strip.

[0019] Preferably, the current sampling device 112 further includes two pins 112-4, each pin 112-4 is an L-shaped structure, one end of the two pins 112-4 is respectively connected to the two ends of one side of the manganese-copper alloy part 112-1, and the two pins 112-4 form an L-shaped structure as a whole.

[0020] Preferably, the circuit breaker further includes a circuit board 111 connected to the electric mechanism 3; the two pins 112-4 of the current sampling device 112 are respectively connected to the circuit board 111 through two signal wires 112-5, and the two signal wires 112-5 are twisted together.

[0021] Preferably, the two current-carrying copper strips are a first current-carrying copper strip 112-2 and a second current-carrying copper strip 112-3 respectively connected to the two ends of the manganese-copper alloy part 112-1, and respectively connected to the incoming terminal 880 and the protection mechanism; the first current-carrying copper strip 112-2 has the same width as the manganese-copper alloy part 112-1; the second current-carrying copper strip 112-3 has a width greater than the width of the manganese-copper alloy part 112-1, and the lower side of the end of the second current-carrying copper strip 112-3 away from the manganese-copper alloy part 112-1 is protruding with a copper strip wiring finger for connecting to the protection mechanism.

[0022] The circuit breaker of the present invention has a reasonable internal layout design and a compact layout between the various components, which can effectively reduce the overall specifications of the circuit breaker and conform to the development trend of miniaturization of circuit breakers. Moreover, the current sampling device is arranged between the overload protection mechanism or short-circuit protection mechanism arranged side by side with the arc extinguishing system and the incoming terminal, which significantly improves the safety of the current sampling device and facilitates the derivation of the signal of the current sampling device.

[0023] In addition, the thickness of the manganese-copper alloy portion of the current sampling device is greater than the thickness of the current-carrying copper strip. By increasing the thickness of the manganese-copper alloy portion, the resistance value of the manganese-copper alloy portion and the entire current sampling device is reduced. The required resistance value is obtained without increasing the height of the manganese-copper alloy portion. The heat dissipation is good and the space occupied by the current sampling device is reduced, which facilitates the overall design and layout of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of the circuit breaker of the present invention, showing at least the specific structures of the button mechanism, the electric mechanism and the operating mechanism;

[0025] Figure 2 It is a structural schematic diagram of the connecting piece of the present invention;

[0026] Figure 3 It is a schematic structural diagram of the driving gear member of the present invention;

[0027] Figure 4 This is a schematic diagram of the assembly relationship between the driven gear, energy storage spring and transmission member of the present invention;

[0028] Figure 5 1 is a schematic structural diagram of the driven gear of the present invention;

[0029] Figure 6 is a schematic structural diagram of the transmission member of the present invention, showing at least the positional relationship between the first transmission member connecting hole, the second transmission member connecting hole, and the transmission member shaft hole;

[0030] Figure 7 It is a schematic structural diagram of the transmission member of the present invention, showing at least the positional relationship between the energy storage spring assembly groove, the driven gear limiting groove and the transmission member spring limiting groove;

[0031] Figure 8 It is a structural schematic diagram of the energy storage spring of the present invention;

[0032] Figure 9 1 is a schematic structural diagram of a circuit breaker according to the present invention, wherein the circuit breaker is in an open state and the driving gear is in a first initial position;

[0033] Figure 10 1 is a schematic structural diagram of a circuit breaker according to the present invention, wherein the circuit breaker is in an open state, and the driving gear member rotates from a first initial position to engage with the driven gear member;

[0034] Figure 11 Schematic diagram of the structure of the circuit breaker of the present invention, the circuit breaker is in the closing process, and the moving contact and the static contact are closed;

[0035] Figure 12 Schematic diagram of the structure of the circuit breaker of the present invention, the circuit breaker is in the closed state, and the driving gear is in the middle position;

[0036] Figure 13 This is a schematic diagram of the coordination between the driving gear and the closing position stop in the present invention;

[0037] Figure 14 This is a schematic diagram of the assembly structure of the manual-automatic switching device of the present invention;

[0038] Figure 15 It is a structural schematic diagram of the circuit breaker operation interface of the circuit breaker housing of the present invention;

[0039] Figure 16 1 is a schematic structural diagram of the manual-automatic switching device of the present invention, illustrating the coordination relationship between the manual-automatic switching device and the switching element;

[0040] Figure 17 is a schematic structural diagram of the circuit breaker of the present invention, which at least shows the distribution relationship of the various components of the circuit breaker within the circuit breaker housing;

[0041] Figure 18 is a schematic structural diagram of the circuit breaker of the present invention, which at least shows the positional relationship between the circuit board and other components of the circuit breaker;

[0042] Figure 19 This is a schematic diagram of the positional relationship between the circuit board, the incoming terminal, and the circuit board slot of the present invention;

[0043] Figure 20 This is a schematic diagram of the positional relationship between the incoming terminal and the circuit board slot of the present invention;

[0044] Figure 21 It is a partially enlarged structural schematic diagram of the circuit breaker of the present invention, which at least shows the position and connection relationship of the current sampling device;

[0045] Figure 22 It is a structural schematic diagram of the current sampling device of the present invention. DETAILED DESCRIPTION

[0046] The following is combined with Figure 1-22 The following examples are provided to further illustrate the specific implementation of the circuit breaker of the present invention. The circuit breaker of the present invention is not limited to the description of the following examples.

[0047] The present invention discloses a circuit breaker, which includes a circuit breaker housing 1 and a button mechanism 2, an electric mechanism 3, and an operating mechanism 5 arranged in the circuit breaker housing 1; a moving contact 1a connected to the operating mechanism 5, and a static contact 1b used in conjunction with the moving contact 1a; operating the button mechanism 2 can drive the circuit breaker to close / open through the operating mechanism 5, thereby realizing manual opening and closing; the electric mechanism 3 cooperates with the button mechanism 2 and / or the operating mechanism 5 to drive the circuit breaker to close / open (electric opening / closing), thereby realizing automatic opening and closing. Furthermore, the circuit breaker of the present invention also includes a short-circuit protection mechanism 6, an arc extinguishing system 7, an overload protection mechanism 110, an incoming terminal 880, and an outgoing terminal 881; the short-circuit protection mechanism 6 and the overload protection mechanism 110 respectively cooperate with the operating mechanism 5 to drive. When a short circuit or overload fault occurs in the circuit breaker, the short-circuit protection mechanism 6 and the overload protection mechanism 110 drive the operating mechanism 5 to trip, thereby disconnecting the moving contact 1a and the static contact 1b of the circuit breaker.

[0048] The following is a first circuit breaker disclosed in the present invention:

[0049] like Figure 1 、 9 -As shown in Figure 12, the present invention discloses a circuit breaker, which includes a circuit breaker housing 1 and a button mechanism 2, an electric mechanism 3, and an operating mechanism 5 arranged in the circuit breaker housing 1; operating the button mechanism 2 can drive the circuit breaker to close / open through the operating mechanism 5; the electric mechanism 3 cooperates with the button mechanism 2 and the operating mechanism 5, and the electric mechanism 3 drives the circuit breaker to close through the operating mechanism 5, and the electric mechanism 3 drives the circuit breaker to open through the button mechanism 2. The operating mechanism 5 includes a transmission member 501 pivotally arranged on the circuit breaker housing 1 and connected to the button mechanism 2. Pressing the button mechanism 2 drives the transmission member 501 to rotate in the closing direction to realize manual closing, and pulling the button mechanism 2 drives the transmission member 501 to rotate in the opposite direction to realize manual opening; the electric mechanism 3 drives the transmission member 5 to rotate to close the circuit breaker (electric closing), and the electric mechanism 3 drives the transmission member 501 to rotate in the opposite direction through the button mechanism 2 to open the circuit breaker (electric opening). Further, as Figure 1 、 9As shown in FIG. 12 , the electric mechanism 3 includes a driving gear 305 and a driven gear 306 respectively pivotally mounted on the circuit breaker housing 1. The driving gear 305 and the driven gear 306 are driven in cooperation with each other. The driven gear 306 is coaxially arranged with the transmission member 501 and driven in cooperation with each other. The driving gear 305 and the driven gear 306 are driven in cooperation with each other. The driven gear 306 drives the transmission member 501 to rotate in the closing direction to close the circuit breaker. The driving gear 305 is driven in cooperation with the button mechanism 2. The button mechanism 2 drives the transmission member 501 to rotate in the opposite direction to open the circuit breaker, thereby realizing automatic opening and closing. The circuit breaker of the present invention includes an electric mechanism for realizing automatic opening and closing of the circuit breaker. The closing operation is realized by the cooperation of the electric mechanism and the operating mechanism, and the opening operation is realized by the cooperation of the electric mechanism and the button mechanism. This simplifies the structure of the electric opening and closing and prolongs the service life of the circuit breaker.

[0050] Furthermore, as one of the improvements of the present invention, the driving gear member 305 drives the driven gear 306 to achieve the rotation direction when closing the circuit breaker, which is consistent with the rotation direction when driving the button mechanism 2 to achieve opening. That is, during the automatic opening and closing process, the motor of the electric mechanism 3 always rotates in one direction, which is conducive to simplifying the control process of the electric mechanism 3. A specific embodiment is that when closing the circuit breaker, the driving gear member 305 rotates from the first initial position to the first direction until it engages with the driven gear 306, and the driving gear member 306 continues to rotate and drives the transmission member 501 to rotate in the second direction through the driven gear 306, so that after the circuit breaker is closed, the driving gear member 305 continues to rotate to the intermediate position (the intermediate position refers to the position where the gear member 305 is disengaged from the driven gear 306 and the gear member 305 does not drive the connecting member 204 in the button mechanism 2) and disengages from the driven gear 306; when opening the circuit breaker, the driving gear member 305 rotates from the intermediate position to the first direction and drives the button mechanism 2 to operate, and the button mechanism 2 drives the transmission member 501 to rotate in the first direction, so that after the circuit breaker is opened, the driving gear member 305 continues to rotate to the first initial position (that is, the position that does not affect the manual opening and closing function of the circuit breaker). In the circuit breaker of the present invention, the closing operation is achieved through the cooperation of the electric mechanism 3 and the operating mechanism 5, and the opening operation is achieved through the cooperation of the electric mechanism 3 and the button mechanism 2. Firstly, compared with the circuit breaker in the prior art in which both the closing and opening operations are achieved through the cooperation of the electric mechanism 3 and the operating mechanism 5, the wear of the operating mechanism 5 is effectively slowed down, thereby facilitating the extension of the service life of the circuit breaker; secondly, during the closing / opening process, the driving gear 305 of the electric mechanism 3 always rotates in the first direction, that is, during the closing / opening process, the motor 301 of the electric mechanism 3 does not need to change the direction of rotation, which is conducive to simplifying the control process of the electric mechanism 3; thirdly, the motor 301 of the electric mechanism 3 does not need to frequently switch between forward rotation and reverse rotation, thereby reducing the probability of damage to the motor 301 and facilitating the extension of the service life of the electric mechanism 3.

[0051] Preferably, Figure 1 As shown, the button mechanism 2 includes a button member 201 and a connecting member 204, each slidably disposed on the circuit breaker housing 1; a first connecting rod 202, each connected to the button member 2 and the connecting member 204 at both ends; and a second connecting member 203, each connected to the connecting member 204 and the transmission member 501 at both ends. It should be noted that the button member 201, the first connecting rod 202, and the connecting member 204 of the button mechanism 2 can also be designed as an integrated component, thereby reducing the number of parts. To facilitate the convenient coordination of the button mechanism 2 with other mechanisms and without affecting coordination with the electric mechanism 3, the button mechanism 2 of the present invention is preferably a combination of the button member 201, the first connecting rod 202, the connecting member 204, and the second connecting rod 203. Furthermore, an indicator (not shown) for indicating the opening and closing status is also provided within the button member 201. The button member 201 is provided with an indicator window. During the opening and closing operation, the button member 201 drives the indicator to swing or slide to display the opening and closing status of the circuit breaker.

[0052] Further, such as Figure 17 As shown, the circuit breaker further includes a locking mechanism 4, one end of which is an actuated end protruding from the exterior of the circuit breaker housing 1, and the other end is a mating end for mating with the button mechanism 2. An improvement of the present invention is that the mating end of the locking mechanism 4 mates with the button member 201 or the first connecting rod 202, while the driving gear member 305 of the electric mechanism 3 mates with the connecting member 204. The button mechanism 2 utilizes a combination of the button member 201, the first connecting rod 202, and the connecting member 204, facilitating simultaneous mating of the button mechanism 2 with both the locking mechanism 4 and the electric mechanism 3. It should be noted that the circuit breaker of this embodiment is a plug-in circuit breaker, which is inserted and installed in the circuit breaker assembly position of the cabinet. The locking mechanism 4 cooperates with the button mechanism 2 and the housing of the circuit breaker assembly position to achieve locking and / or unlocking of the circuit breaker after it is installed in the circuit breaker assembly position, and / or prevent the circuit breaker from being installed incorrectly, and / or prevent the circuit breaker from being installed in the circuit breaker assembly position or being removed from the circuit breaker assembly position in the closed state, and / or prevent the circuit breaker from being closed when it is not installed in the circuit breaker assembly position. The button mechanism 2 of the present invention is suitable for cooperating with each locking mechanism 4, which all fall within the scope of protection of the present invention.

[0053] For example, one embodiment of the locking mechanism is that a locking hole that cooperates with the activated end of the locking mechanism is provided on the circuit breaker assembly position of the cabinet. After the circuit breaker is installed in place, the activated end of the locking mechanism 4 protrudes from the outside of the circuit breaker housing 1 and protrudes into the locking hole of the cabinet, preventing the circuit breaker from being pulled out of the cabinet at will. When the button member 201 is pulled, the button member 201 or the first connecting rod 202 or the connecting member 204 or the indicator can drive the locking mechanism's mating end to retract the activated end of the locking mechanism into the circuit breaker housing 1, so that the circuit breaker can be pulled out of the circuit breaker assembly position. Another embodiment of the locking mechanism is that when the circuit breaker is not installed in the circuit breaker assembly position, the active end of the locking mechanism is squeezed by the cabinet wall to retract into the inside of the circuit breaker housing 1, and the mating end of the locking mechanism is limitedly engaged with the button member 201 or the first connecting rod 202 or the connecting member 204 or the indicator member to prevent the button member 201 from moving in the closing direction, making it impossible to close the circuit breaker when it is not installed in the circuit breaker assembly position; when the circuit breaker is installed in the circuit breaker assembly position, the active end of the locking mechanism is no longer squeezed by the shell of the circuit breaker assembly position to move toward the outside of the circuit breaker housing 1, so that the mating end of the locking mechanism is released from the limited engagement with the button member 201 or the first connecting rod 202 or the connecting member 204, and the button member 201 can move in the closing direction and close the circuit breaker through the operating mechanism 5.

[0054] Preferably, Figure 4 、 9As shown in Figure 12, the circuit breaker of the present invention also includes an energy storage spring 3-5 disposed between the driven gear 306 and the transmission member 501; this is used to compensate for incomplete automatic closing and improve the reliability of automatic closing. The provision of the energy storage spring 3-5 serves the following purposes: firstly, to allow a certain margin of travel for the sector gears of the driving gear 305 and the driven gear 306 to fit together; secondly, even if the gears and structural components experience mismatch due to wear, this margin of travel can still ensure reliable closing. Specifically, the driving gear member 305 rotates from the first initial position in the first direction to engage with the driven gear 306, the driving gear member 305 continues to rotate and drives the driven gear 306 to rotate in the second direction, and the driven gear 306 drives the transmission member 501 to rotate in the second direction through the energy storage spring 3-5. After the circuit breaker is closed, the driving gear member 305 continues to rotate in the first direction and drives the driven gear 306 to rotate in the second direction relative to the transmission member 501, causing the energy storage spring 3-5 to store energy until the driving gear member 305 rotates to the middle position and disengages from the driven gear 306. In the circuit breaker of the present invention, an energy storage spring 3-5 is provided between the driven gear 306 of the electric mechanism 3 and the transmission member 501 of the operating mechanism 5. After the circuit breaker is closed, the driving gear member 305 of the electric mechanism 3 drives the driven gear 306 to rotate in the second direction relative to the transmission member 501, so that the energy storage spring stores energy, thereby ensuring that the circuit breaker is closed in place, that is, ensuring that the circuit breaker is effectively closed, and improving the user's power safety. In particular, after long-term use of the electric mechanism 3, the gears may have matching errors with each other due to wear or errors in the position detection of the circuit board, resulting in the problem that the circuit breaker cannot be automatically closed in place. The energy storage spring of the present invention can reliably solve the above problem. Further, if Figure 9 and 12 As shown, when the circuit breaker is in the closed state, the driving gear member 305 rotates from the middle position to the first direction and drives the button mechanism 2 to operate. The button mechanism 2 drives the transmission member 501 to rotate in the first direction, so that after the circuit breaker is opened, the driving gear member 305 continues to rotate to the first initial position.

[0055] Preferably, Figure 9-12 As shown in Figures 1 and 2, the incoming and outgoing terminals 880 and 881 are respectively disposed at opposite ends of the circuit breaker housing 1; the operating mechanism 5 is disposed in the middle of the circuit breaker housing 1; the arc extinguishing system 7 and the protection mechanism are disposed side by side between the operating mechanism 5 and the incoming terminal 8; the electric mechanism 3 is disposed between the outgoing terminal 881 and the operating mechanism 5, and the electric mechanism 3 and the outgoing terminal 881 are disposed on the same side of the operating button 2; and the two ends of the current sampling device 112 are electrically connected to the protection mechanism and the incoming terminal 880, respectively. Furthermore, the protection mechanism is an overload protection mechanism 110 or a short-circuit protection mechanism 6.

[0056] Preferably, Figure 22As shown, the current sampling device 112 is a manganese copper shunt, comprising a manganese copper alloy portion 112-1 and a current-carrying copper strip, wherein the two current-carrying copper strips are connected to both ends of the manganese copper alloy 112-1 respectively; the thickness of the manganese copper alloy portion 112-1 is greater than the thickness of the current-carrying copper strip. Figure 22 As shown, the width of the manganese-copper alloy portion 112-1 is less than or equal to the width of the current-carrying copper strip. The thickness of the manganese-copper alloy portion of the current sampling device is greater than that of the current-carrying copper strip. Increasing the thickness of the manganese-copper alloy portion reduces the resistance of the manganese-copper alloy portion and the entire current sampling device, achieving the desired resistance without increasing the height of the manganese-copper alloy portion. This improves heat dissipation and reduces the footprint of the current sampling device, facilitating the overall design and layout of the circuit breaker. Furthermore, the current sampling device 112 is electrically connected to the protection mechanism and the incoming terminal 880, respectively, via two current-carrying copper strips.

[0057] like Figure 1-20 FIG. 1 shows the first embodiment of the circuit breaker of the present invention, which is the first embodiment of the first type of circuit breaker.

[0058] like Figure 1 、 9 As shown in Figure 12, the circuit breaker of the present invention includes a circuit breaker housing 1 and a button mechanism 2, an electric mechanism 3 and an operating mechanism 5 arranged in the circuit breaker housing 1. The button mechanism 2 is driven and connected to the operating mechanism 5, and can drive the circuit breaker to close / open through the operating mechanism 5 to achieve manual opening and closing; the electric mechanism 3 cooperates with the button mechanism 2 and / or the operating mechanism 5 to drive the circuit breaker to close / open through the operating mechanism 5 to achieve automatic opening and closing.

[0059] Preferably, Figure 1 As shown, the electric mechanism 3 cooperates with the transmission member 501 of the operating mechanism 5 to close the circuit breaker, and cooperates with the button mechanism 2 to open the circuit breaker. The electric mechanism 3 includes a driving gear member 305 and a driven gear 306 respectively pivotally arranged on the circuit breaker housing 1. The driving gear member 305 cooperates with the driven gear 306 and the button mechanism 2 respectively; the operating mechanism 5 includes a transmission member 501 pivotally arranged on the circuit breaker housing 1 and drivingly connected to the button mechanism 2. The driven gear 306 is coaxially arranged with the transmission member 501 and drives in cooperation; the driving gear member 305 moves from a first initial position (such as Figure 9 ) rotates in the first direction until it engages with the driven gear 306 (as shown Figure 10 As shown), the driving gear 305 continues to rotate and drives the transmission member 501 to rotate in the second direction through the driven gear 306, so that after the circuit breaker is closed, the driving gear 305 continues to rotate to the middle position (as shown). Figure 12As shown) and disengages from the driven gear 306; the driving gear member 305 rotates from the intermediate position to the first direction and drives the button mechanism 2 to operate, and the button mechanism 2 drives the transmission member 5 to rotate in the first direction, so that the circuit breaker is opened, and the driving gear member 305 continues to rotate to the first initial position.

[0060] The driving gear 305 drives the driven gear 306 to realize the rotation direction of the circuit breaker when closing, which is consistent with the rotation direction of the driving button mechanism 2 when opening, which is conducive to simplifying the control process of the electric mechanism 3. Figure 1 、 9 -12, the first direction is counterclockwise, and the second direction is clockwise. The driving gear 305 maintains counterclockwise rotation (i.e., always rotates in the same direction) during the process of driving the circuit breaker to close and open. When the driving gear 305 is in the first initial position or the intermediate position, it disengages from the driven gear 306. When the driving gear 305 rotates to the first initial position or the intermediate position, the driving gear 305 or the driven gear 306 triggers the disconnection of the power supply circuit of the electric mechanism 3, de-energizing the motor 301 and stopping the driving gear 305. This greatly simplifies the control process of the electric mechanism 3. Of course, it is also possible for the driving gear 305 or the driven gear 306 to trigger a position sensor when the driving gear 305 rotates to the first initial position or the intermediate position, transmitting the position information to the control chip, which then controls the motor to stop rotating. However, this is relatively complex to implement.

[0061] Preferably, the driven gear 306 and the transmission member 501 are integral components or separate components.

[0062] Preferably, the electric mechanism 3 includes an electric motor 301 and a gear set that are sequentially connected and driven, and the gear set includes a transmission gear set, a driving gear 305 and a driven gear 306. Figure 1 FIG. 1 shows an embodiment of the electric mechanism 3. The electric mechanism 3 includes a motor 301, a worm 302, a first transmission gear 303, a second transmission gear 304, and a driving gear 305, which are sequentially driven and engaged with each other, and a driven gear 306 that is driven and engaged with the driving gear 305. The transmission gear set includes the first transmission gear 303 and the second transmission gear 304, which are each pivotally mounted on the circuit breaker housing 1. Obviously, the number of transmission gears in the transmission gear set can be reduced or increased as needed.

[0063] Preferably, Figure 3As shown, the driving gear member 305 includes a first driving gear 305-1 and a driving gear 305-20 that are respectively driven and matched with the driven gear 306 and the button mechanism 2. Specifically, the driving gear member 305 includes a first driving gear 305-1, a second driving gear 305-2 and a third driving gear 305-3 that are coaxially linked and arranged in sequence. The third driving gear 305-3 is driven and matched with the second driving gear member 304 of the transmission gear group. The first driving gear 305-1 and the second driving gear 305-2 are respectively driven and matched with the driven gear 306 and the button mechanism 2. Further, as shown Figure 1 、 4 As shown, the first driving gear 305-1 and the driven gear 306 are both sector gears; the second driving gear 305-2 is provided with a driving tooth 305-20 that cooperates with the button mechanism 2. When the switch is closed, the driving gear 305 rotates in the first direction, the first driving gear 305-1 is engaged with the driven gear 306, and the driving tooth 305-20 avoids the button mechanism 2. After the switch is closed, the first driving gear 305-1 is disengaged from the driven gear 306; when the switch is opened, the driving gear 305 continues to rotate in the first direction, and the driving tooth 305-20 cooperates with the button mechanism 2 to achieve opening. At this time, the first driving gear 305-1 and the driven gear 306 remain disengaged. Obviously, the driving tooth 305-20 can be Figure 3 The illustrated embodiment includes only one drive gear 305-20, but a sector gear having multiple drive gears may be provided as needed. The connecting member 204 on the button mechanism 2 may be provided with teeth to cooperate with the second drive gear 305-2 having multiple drive gears. Alternatively, the drive gear 305-20 may also be provided on the first drive gear 305-1.

[0064] Preferably, Figure 1 As shown, the button mechanism 2 includes a button member 201 and a connecting member 204 respectively slidably arranged on the circuit breaker housing 1, a first connecting rod 202 connected to the button member 201 and the connecting member 204 at both ends, and a second connecting rod 203 connected to the connecting member 204 and the transmission member 501 at both ends; pressing / pulling the button member 201 drives the transmission member 501 to rotate in the second direction / first direction through the first connecting rod 202, the connecting member 204, and the second connecting rod 203 connected in sequence, thereby closing / opening the circuit breaker. Figure 1 As shown, the second driving gear 305 - 2 of the driving gear member 305 is drivingly engaged with the connecting member 204 .

[0065] Specifically, such as Figure 1 、 9-12, the button member 201, the first connecting rod 202, the connecting member 204 and the second connecting rod 203 of the button mechanism 2 are arranged in a straight line from top to bottom. When the button member 201 is pulled upward / pressed downward, the button member 201 drives the transmission member 501 to rotate counterclockwise / clockwise through the first connecting rod 202, the connecting member 204 and the second connecting rod 203 connected in sequence, so that the circuit breaker is closed / opened; when the circuit breaker is in the closed state, the second driving gear 305-2 drives the connecting member 204 to move upward, and the connecting member 204 drives the transmission member 501 to rotate clockwise through the second connecting rod 203, so that the circuit breaker is opened.

[0066] Preferably, Figure 17 As shown, the circuit breaker of the present invention also includes a locking mechanism 4, one end of which is a locking mechanism actuated end, protruding from the outside of the circuit breaker housing 1, and the other end is a locking mechanism mating end, which is limitedly mated with the button mechanism 2. The locking mechanism 4 includes a locking member pivotally mounted on the circuit breaker housing 1, with the two ends of the locking member being a locking mechanism actuated end and a locking mechanism mating end. Specifically, as shown in FIG. Figure 17 In the direction shown, the upper end and the lower end of the locking member of the locking mechanism 4 are respectively the actuated end and the mating end of the locking mechanism. When the button member 201 or the first connecting rod 202 is limitedly engaged with the mating end of the locking mechanism, the button member 201 cannot move downward (in the closing direction) and the circuit breaker cannot be closed.

[0067] Preferably, the first connecting rod 202 and the second connecting rod 203 are both U-shaped connecting rods.

[0068] Preferably, Figure 1 As shown, the button mechanism 2 further includes a first reset spring 205 for driving the connector 204 to reset, which is used to drive the button mechanism 2 to reset after the circuit breaker is tripped; the circuit breaker housing 1 further includes a connector track groove, and the connector 204 slides linearly along the connector track groove.

[0069] Preferably, Figure 2 FIG. 1 is an embodiment of the connecting member 204 .

[0070] like Figure 2 As shown, the connecting member 204 is a strip-shaped member, including a connecting member body 204-0, a connecting member first hole 204-1 and a connecting member second hole 204-3 respectively provided at both ends of the connecting member body 204-0 and respectively cooperating with the first connecting rod 202 and the second connecting rod 203, a connecting member driven table 204-4 drivingly cooperating with the driving teeth 305-20 of the driving gear member 305, a connecting member spring limiting boss 204-2 provided on one side of the connecting member body 204-0, and a connecting member track boss 204-5 provided on the connecting member body 204-0. Further, as Figure 2As shown, the connector track boss 204-5 and the connector first hole 204-1 are arranged at the same end of the connector body 204-0, and the connector track boss 204-5 is arranged on the side of the connector body 204-0 facing the bottom plate of the circuit breaker housing 1; the connector active surface 204-4 and the connector second hole 204-3 are arranged at the same end of the connector body 204-0, and the connector active surface 204-4 is arranged facing the transmission member 501 of the operating mechanism 5; the connector spring limiting boss 204-2 is arranged on the side of the connector body 204-0 away from the electric mechanism 3.

[0071] Specifically, such as Figure 2 In the direction shown, the first connecting member hole 204-1 and the connecting member track boss 204-5 are located at the left end of the connecting member body 204-0, and the connecting member track boss 204-5 is arranged on the lower side of the connecting member body 204-0; the second connecting member hole 204-3 and the connecting member active table 204-4 are located at the right end of the connecting member body 204-0, and the connecting member active table 204-4 is arranged facing the right side; the connecting member spring limiting boss 204-2 is arranged on the rear side of the connecting member body 204-0.

[0072] like Figure 1 As shown, the first return spring 205 is arranged between the connector spring limiting boss 204-2 and the circuit breaker housing 1; the connector track boss 204-5 is slidably arranged in the connector track groove. The connector 204 and the circuit breaker housing 1 are effectively limited by the cooperation between the connector track boss 204-5 and the connector track groove, ensuring the stability of the connector 204 during the sliding process, thereby improving the stability of the circuit breaker performance. Further, as Figure 17 As shown, the locking member 4 and the first return spring 205 are both located on the same side of the button member 201 and the connecting member 204. Specifically, as Figure 17 In the direction shown, the locking member 4 and the first return spring 205 are both located on the right side of the button member 201 and the connecting member 204 .

[0073] Preferably, Figure 1 As shown, one end of the button member 201 is an operating end located outside the circuit breaker housing 1, and the other end extends into the circuit breaker housing 1. A button member connecting hole for mounting the first connecting rod 202 is provided on the other end. The button member connecting hole is a long waist-shaped hole, so that pressing the button member 201 causes one end to have an idle stroke. When the circuit breaker needs to be pulled out of the installation cabinet after the trip, the button member 201 of the button mechanism 2 is pulled, so that the locking mechanism 4 is completely retracted into the circuit breaker housing, so as to contact the locking mechanism 4 and cooperate with the housing of the circuit breaker assembly position to pull the circuit breaker out of the circuit breaker assembly position.

[0074] Preferably, Figure 1FIG. 1 shows an embodiment of the operating mechanism 5 .

[0075] like Figure 1 As shown, the operating mechanism 5 includes a transmission member 501 and a rotating plate 505, each pivotally mounted on the circuit breaker housing 1; a trip latch 503 and a lock latch 504, each pivotally mounted on the rotating plate 505 and engaging with the trip latch; a third connecting rod 502 connected at both ends to the transmission member 501 and the trip latch 503; and a second return spring 506 for driving the rotating plate 504. The second return spring 506 is disposed between the lock latch 504 and the circuit breaker housing 1. The circuit breaker also includes a static contact 1b and a movable contact 1a connected to the operating mechanism 5. One end of the movable contact 1a is connected to the rotating plate 505, while the static contact 1b is fixed to the circuit breaker housing 1. The structure, principle, and operating process of the operating mechanism 5 of this embodiment are similar to those of the prior art and will not be further described here. Of course, the operating mechanism 5 of the circuit breaker of the present invention can also adopt other structures.

[0076] Preferably, Figure 4-8 FIG. 1 shows a second embodiment of the circuit breaker of the present invention, which is also the second embodiment of the first type of circuit breaker.

[0077] like Figure 4 As shown, the circuit breaker of this embodiment differs from the first embodiment in that it also includes an energy storage spring 3-5 disposed between the driven gear 306 and the transmission member 501; this is used to compensate for incomplete automatic closing and improve the reliability of automatic closing. The provision of the energy storage spring 3-5 serves to firstly allow a certain margin of fit between the sector gears of the driving gear member 305 and the driven gear 306, and secondly, ensures reliable closing even if the gears experience mismatch due to wear. Specifically, the driving gear member 305 rotates from the first initial position in the first direction to engage with the driven gear 306, the driving gear member 305 continues to rotate and drives the driven gear 306 to rotate in the second direction, and the driven gear 306 drives the transmission member 501 to rotate in the second direction through the energy storage spring 3-5. After the circuit breaker is closed, the driving gear member 305 continues to rotate in the first direction and drives the driven gear 306 to rotate in the second direction relative to the transmission member 501, so that the energy storage spring 3-5 stores energy and the moving and static contacts are in reliable contact, until the transmission gear member 305 rotates to the middle position and disengages from the driven gear 306, and the driven gear 306 is reset relative to the transmission member 501 under the action of the energy storage spring 3-5 releasing energy (the energy storage spring 3-5 releases energy, which will give the driven gear 306 a force to rotate in the first direction relative to the transmission member 501).

[0078] Preferably, Figure 4 and 8As shown, the energy storage spring 3-5 is a torsion spring, including a spring body 3-50, a first spring arm 3-51 and a second spring arm 3-52; the spring body 3-50 is arranged between the driven gear 306 and the transmission member 501 and is coaxial with the driven gear 306 and the transmission member 501, the first spring arm 3-51 is limited in position with the transmission member 501, and the second spring arm 3-52 is limited in position with the driven gear 306. Further, as Figure 4-7 As shown, the transmission member 51 includes a driven gear limiting groove 501-306 arranged on one side thereof, the driven gear 306 includes a driven gear body 306-2 and a first sector gear portion 306-1 arranged on one side of the driven gear body 306-2, the driven gear body 306-2 is coaxially pivoted with the transmission member 501 and arranged on the circuit breaker housing 1, the first sector gear portion 306-1 is arranged in the driven gear limiting groove 501-306, one end of the first sector gear portion 306-1 is abutted against the side wall of one end of the driven gear limiting groove 501-306, and a first movement gap is provided between the other end of the first sector gear portion 306-1 and the side wall of the other end of the driven gear limiting groove 501-306; the spring body 3-50 is located between the driven gear body 306-2 and the transmission member 51.

[0079] Preferably, Figure 4-7 As shown, the first sector gear portion 306-1 includes a first sector gear portion head end face 306-10 and a first sector gear portion tail end face 306-11 respectively arranged at both ends thereof, and the transmission member 501 also includes a driven gear limiting groove head end face 501-6 and a driven gear limiting groove tail end face 501-4 arranged at both ends of the driven gear limiting groove 501-306, the first sector gear portion head end face 306-10 and the driven gear limiting groove head end face 501-6 are abutted against each other, and a first motion gap is provided between the first sector gear portion tail end face 306-11 and the driven gear limiting groove tail end face 501-4.

[0080] Specifically, such as Figure 4 As shown, when the circuit breaker is in the closed state or the open state, the energy storage spring 3-5 causes the first sector gear portion head end face 306-10 of the driven gear 306 to abut against the first end face 501-6 of the driven gear slot, and a first movement gap is formed between the first sector gear portion tail end face 306-11 and the driven gear limit slot tail end face 501-4; Figure 9-12 As shown, the driving gear member 305 rotates in the first direction (counterclockwise) until it meshes with the first sector gear portion 306-1 of the driven gear 306 (as shown in FIG. Figure 10As shown), the driving gear 305 continues to rotate and drives the driven gear 306 to rotate in the second direction (clockwise) through the first sector gear portion 306-1. The driven gear 306 drives the transmission member 501 to rotate in the second direction (clockwise) through the energy storage spring 3-5, and the operating mechanism 5 drives the moving contact 1a and the static contact 1b to close (as shown). Figure 11 As shown), after the circuit breaker is closed, the transmission member 501 is fixed in position and no longer rotates, as shown in FIG. Figure 11 As shown, at this time, the driving gear member 305 is still engaged with the first sector gear portion 306-1, and is preferably set to be disengaged when there is only one irregular tooth left. The driving gear member 305 continues to rotate and drives the driven gear 306 to rotate in the second direction (clockwise) relative to the transmission member 501 through the first sector gear portion 306-1, so that the energy storage spring 3-5 stores energy, and the energy storage spring 3-5 applies the stored energy to the transmission member 501 (that is, applies a thrust to the transmission member 501 to rotate in the first direction), ensuring that the circuit breaker can still be effectively closed due to structural component size deviation or gear wear of the motor mechanism. Figure 12 As shown, after the circuit breaker is closed, the driving gear 305 continues to rotate to the middle position and disengages from the first sector gear portion 306-1, and the driven gear 306 will be reset under the energy release action of the energy storage spring 3-5 (that is, the first end face 306-10 of the first sector gear portion is restored to a state of abutting against the first end face 501-6 of the driven gear limit groove).

[0081] Preferably, Figure 4 As shown, the driven gear 306 also includes a driven gear spring limiting hole 306-3 arranged on the driven gear body 306-2, and the transmission member 501 also includes a transmission member spring limiting groove 501-5 arranged at one end of the driven gear limiting groove 501-306, and the transmission member spring limiting groove 501-5 and the driven gear limiting groove tail end face 501-4 are located at the same end of the transmission gear limiting groove 501-306; the first spring arm 3-51 is limitedly matched with the transmission member spring limiting groove 501-5, and the second spring arm 3-52 is limitedly matched with the driven gear spring limiting hole 306-3.

[0082] Preferably, Figure 4-7As shown, the transmission member 501 also includes a transmission member body 501-0 and a transmission member spring assembly groove 501-7 arranged on one side of the transmission member body 501-0, and the driven gear limiting groove 501-306 is arranged on one side of the transmission member spring assembly groove 501-7; the driven gear body 306-2 and the first sector gear part 306-1 are staggered, and the first sector gear part 306-1 is offset to the side where the transmission member 501 is located relative to the driven gear body 306-2; the spring body 3-50 is arranged in the transmission member spring assembly groove 501-7 and is limited between the driven gear body 306-2 and the transmission member body 501-0.

[0083] Preferably, Figure 6 and 7 FIG. 5 shows an embodiment of the transmission member 501 .

[0084] like Figure 6 and 7 As shown, the transmission member 501 is a cylindrical structure, including a transmission member body 501-0, a transmission member spring assembly groove 501-7 and a driven gear limiting groove 501-306 arranged on one side of the transmission member body 501-0, and a transmission member shaft hole 501-3, a first transmission member connecting hole 501-1 and a second transmission member connecting hole 501-2 respectively arranged on the transmission member body 501-0; the transmission member spring assembly groove 501-7 and the driven gear limiting groove 501-306 are located on the same side of the transmission member body 501-0, and the driven gear limiting groove 501- 306 is arranged on one side of the transmission member spring assembly groove 501-7; the transmission member shaft hole 501-3, the first transmission member connecting hole 501-1 and the second transmission member connecting hole 501-2 are located at the three vertices of a triangle, the first transmission member connecting hole 501-1 is arranged close to the driven gear limiting groove 501-306, the transmission member 501 is pivoted through the transmission member shaft hole 501-3, the first transmission member connecting hole 501-1 is connected to the second connecting rod 203 of the button mechanism 2, and the second transmission member connecting hole 501-2 is connected to the third connecting rod 502 of the operating mechanism 5.

[0085] Preferably, Figure 7 and 13 As shown, the transmission member 501 further includes a travel limit groove 501-8, and the travel limit groove 501-8 and the driven gear limit groove 501-306 are respectively arranged on both sides of the transmission member spring assembly groove 501-7; the circuit breaker housing 1 further includes an in-place stop 102 arranged on one side of the transmission member 501; when the circuit breaker is in the open state, the side wall of one end of the travel limit groove 510-8 is limited and matched with the in-place stop 102, and when the circuit breaker is in the closed state, the side wall of the other end of the travel limit groove 510-8 is limited and matched with the in-place stop 102. Further, as Figure 13As shown, when the circuit breaker is closed, one end of the travel limit slot 501-8 (as shown in FIG. Figure 13 The direction shown is the lower end of the travel limit slot 501-8) and the position stop 102 are limited. When the circuit breaker is opened, the other end of the travel limit slot 501-8 (such as Figure 13 The direction shown is the upper end of the travel limit groove 501-8) and the position stop 102. The travel limit groove 501-8 and the position stop 102 cooperate to effectively limit the rotational travel of the transmission member 501, preventing the transmission member 501 from excessive rotation and damaging the operating mechanism 5.

[0086] Preferably, Figure 4 and 5 FIG. 1 is an embodiment of the driven gear 306 .

[0087] like Figure 4 and 5 As shown, the driven gear 306 includes a driven gear body 306-2, a first sector gear portion 306-1, and a driven gear shaft hole 306-4 and a driven gear spring limiting hole 306-3 respectively provided on the driven gear body 306-2; the driven gear body 306-2 includes a body base plate 306-20, a body limiting platform 306-21 and a body spring limiting platform 306-22 which are coaxially arranged in sequence and have decreasing diameters in sequence, and the body base plate 306-2 0 is against one side of the transmission member body 501-0 of the transmission member 501, the body limit platform 306-21 is inserted into the transmission member spring assembly groove 501-7 of the transmission member 501, and the body spring limit platform 306-22 is inserted into the middle of the spring body 3-50 of the energy storage spring 3-5; one end of the first sector gear part 306-1 is respectively connected to the side of the body substrate 306-20 connected to the body limit platform 306-21 and the outer edge of the body limit platform 306-21. Further, as Figure 4 and 5 As shown, the driven gear spring limiting hole 306 - 3 is located between the driven gear shaft hole 306 - 4 and the first sector gear portion 306 - 1 .

[0088] Preferably, Figure 14-16 FIG. 1 shows a third embodiment of the circuit breaker of the present invention, which is also the third embodiment of the first type of circuit breaker.

[0089] like Figure 14-16As shown, the circuit breaker of this embodiment differs from the first embodiment in that the circuit breaker further includes a manual-automatic switching device disposed within the circuit breaker housing 1. The circuit breaker is a plug-in type circuit breaker. The circuit breaker housing 1 is substantially a parallelepiped structure and includes a circuit breaker operation interface 1i disposed at one end thereof, a button assembly hole disposed on the circuit breaker operation interface 1i, and an output terminal 881 disposed thereon. One end of the button mechanism 2 is inserted into the button assembly hole, and an input terminal 880 is disposed at the other end of the circuit breaker housing 1. The circuit breaker further includes a manual-automatic switching device disposed within the circuit breaker housing 1. The manual-automatic switching device includes a switching operating element 7a and a switching element 9A. The switching operating element 7a cooperates with the switching element 9A in a driving manner. The switching element 9A is used to switch the circuit breaker between a manual operating mode and an automatic operating mode. The automatic operating mode of the circuit breaker is activated or deactivated by controlling the operating state of the electric mechanism 3. The switching operating element 7a is disposed on the circuit breaker operation interface 1i, located on one side of the button assembly hole, and is movably connected to the circuit breaker housing 1. The manual-automatic switching device of the circuit breaker of the present invention includes a switching operating element 7a and a switching switch element 9A that are driven in coordination, and has a simple structure and is easy to operate. The switching operating element 7a, one end of the button mechanism 2, and the output terminal 881 are all located on the circuit breaker operation interface 1i, which provides a large operating space, facilitates user operation of the circuit breaker, and is easy to observe.

[0090] Further, such as Figure 14-16 As shown, the manual-automatic switching device also includes a switching transmission element 8a, and the switching operating element 7a drives the switching switch element 9A to operate via the switching transmission element 8a. The switching operating element 7a is a knob rotatably mounted on the circuit breaker housing 1, comprising a knob connecting portion 70a, and knob operating ends 71a and a knob driving portion 72a respectively disposed on either side of the knob connecting portion 70a. The switching switch element 9A is a micro switch. One end of the switching transmission element 8a is drivingly connected to the knob driving portion 72a, and the other end is drivingly engaged with the switching switch element 9A. Turning the knob drives the switching transmission element 8a to move toward or away from the switching switch element 9A, pressing or releasing the driving rod of the micro switch.

[0091] Further, such as Figure 16 As shown, the knob drive portion 720a includes a knob drive inclined surface 720a that engages with the switching transmission element 8a. The knob drive inclined surface 720a gradually deviates toward the switching transmission element 8a from one end thereof near the knob connection portion 70a to the other end. All components of the manual-automatic switching device utilize mechanical transmission, ensuring reliable transmission and a simple structure for easy assembly.

[0092] It should be pointed out that the electric mechanism 3 has two working states, namely: normal working state and disengaged working state; in the automatic working mode, the electric mechanism 3 is in normal working state, the power supply circuit of the electric mechanism 3 is continuous, and / or the electric mechanism 3 can normally receive the closing / opening signal, and can perform manual opening and closing and automatic opening and closing; in the manual working mode, the electric mechanism 3 is in the disengaged working state, the power supply circuit of the electric mechanism 3 is cut off, and / or the electric mechanism 3 cannot receive the closing / opening signal, and can only be manually opened and closed.

[0093] Preferably, the switching element 9a is connected in series in the power supply circuit of the electric mechanism 3. By cutting off or connecting the switching element 9a, the power supply circuit of the electric mechanism 3 can be cut off or connected, thereby realizing the switching between the manual working mode, that is, only manual opening and closing, and no automatic opening and closing (the power supply circuit of the electric mechanism 3 is cut off) and the automatic working mode, that is, the automatic working mode is enabled, and manual opening and closing and automatic opening and closing (the power supply circuit of the electric mechanism 3 is connected) can be switched between.

[0094] Preferably, the circuit breaker also includes a circuit board 111 connected to the electric mechanism 3, and the switching element 9a is arranged on the circuit board 111 and is connected to the power control system of the electric mechanism 3 through the circuit board 111. The power control system cuts off or connects the working power of the electric mechanism 3 through the switching element 9a, thereby realizing the switching of the circuit breaker between the manual working mode and the automatic working mode.

[0095] In addition, the switching switch element 9A can also be used to connect to the control chip to transmit the switching control signal. The control chip realizes the switching of the circuit breaker between the manual working mode and the automatic working mode according to the high and low levels of the switching control signal. When the circuit breaker is in the manual working mode, even if the control chip receives the automatic closing control signal, it does not control the electric mechanism to perform the automatic closing operation.

[0096] Preferably, Figure 15 As shown, the outlet terminal 881 is a plug-in type terminal. The circuit breaker housing 1 also includes an outlet hole 1o and a wire removal hole 1d of the outlet terminal 881 provided on the circuit breaker operation interface 1i. The outlet hole 1o and the wire removal hole 1d are used in a one-to-one manner. The wire is inserted through the outlet hole 1o and connected to the outlet terminal 881, and is fixed by the elastic member in the outlet terminal 881. The outlet hole 1o is used to drive the elastic member to enable the wire to be pulled out. The outlet hole 1o, the wire removal hole 1d and the switching operating element 7a are all located on the same side of the button assembly hole. The switching operating element 7a is located between a wire removal hole 1d and the button assembly hole. Further, as Figure 15As shown, the circuit breaker housing 1 includes two wire outlet holes 1o and two wire removal holes 1d, which are respectively the first wire outlet hole and the first wire removal hole used in conjunction with each other, and the second wire outlet hole and the second wire removal hole used in conjunction with each other. The first wire removal hole and the second wire removal hole are arranged near the button assembly hole, and the switching operating element 7a is located in the space surrounded by the first wire removal hole, the second wire outlet hole and the button assembly hole. Further, as Figure 15 As shown, the first wire outlet hole, the first wire removal hole, and the switching operating element 7a are sequentially arranged side by side on one side of the circuit breaker operation interface 1i, and the second wire removal hole and the second wire outlet hole are sequentially arranged side by side on the other side of the circuit breaker operation interface 1i.

[0097] Specifically, such as Figure 14 and 16 In the direction shown, the upper end of the switching transmission element 8a is driven and cooperated with the switching operating element 7a, and the lower end is driven and cooperated with the switching switch element 9a; the switching operating element 7a is rotated to drive the switching transmission element 8a to move downward, and the switching transmission element 8a presses the driving rod of the micro switch (switching switch element 9a) to realize signal switching, thereby driving the circuit breaker to switch between manual working mode and automatic working mode; the first wire outlet hole, the first wire removal hole, and the switching operating element 7a are arranged side by side from left to right on the upper side of the circuit breaker operating interface 1i, and the second wire removal hole and the second wire outlet hole are arranged side by side from left to right on the lower side of the circuit breaker operating interface 1i.

[0098] It should be noted that the switching operating element 7a is not limited to a knob, but can also be a button or a sliding paddle. Specifically, if the switching operating element 7a is a button, pressing or pulling the button drives the switching transmission element 8a to move toward or away from the switching switch element 9a, thereby triggering or releasing the switching switch element 9a. Alternatively, if the switching operating element 7a is a sliding paddle, it is slidably disposed on the circuit breaker operation interface 1i of the circuit breaker housing 1. By sliding the sliding paddle, the switching transmission element 8a is driven to move toward or away from the switching switch element 9a, thereby triggering or releasing the switching switch element 9a.

[0099] Preferably, Figure 16 As shown, the knob driving portion 72a includes a knob driving inclined surface 720a that cooperates with the switching transmission element 8a. The knob driving inclined surface 720a gradually slopes from its end connected to the knob connecting portion 70a to the end of the knob driving inclined surface 720a closer to the switching element 9a. Furthermore, the knob driving inclined surface 720a is a spiral inclined surface, sloping from the upper end to the lower end.

[0100] It should be noted that the knob drive portion 72a may also be threadedly connected to the switching transmission element 8a without the knob drive inclined surface 720a. The switching transmission element 8a cannot rotate, and turning the knob can also drive the switching transmission element 8a toward or away from the switching switch element 9a. Of course, there are many other implementations of the switching operating element 7a, as long as they can drive the switching transmission element 8a toward or away from the switching switch element 9a. These will not be detailed here.

[0101] Preferably, Figure 14 and 16 As shown, the manual-automatic switching device further includes a transmission element return spring 10 for driving the switching transmission element 8a to return.

[0102] Preferably, Figure 16 FIG. 1 shows an embodiment of the switching transmission element 8 a.

[0103] like Figure 16 As shown, the switching transmission element 8a is a rod-shaped member, including a transmission element driven portion 80a, a transmission element spring stopper 82a and a transmission element transmission portion 81a connected in sequence. The transmission element driven portion 80a is driven in conjunction with the knob driving portion 720a, and the transmission element transmission portion 81a is driven in conjunction with the switching switch element 9A. Figure 14 and 16 As shown, the transmission element reset spring 10 is sleeved on the transmission element transmission part 81a, with one end being limitedly matched with the transmission element spring limit platform 82a, and the other end being limitedly matched with the circuit breaker housing 1.

[0104] Preferably, Figure 14 As shown, the circuit breaker housing 1 also includes a transmission element assembly slot provided on one side of the button mechanism 2, the transmission element assembly slot includes an upper assembly slot section 103-1, a lower assembly slot section 103-2, and an assembly slot tail section connected in sequence, the width of the lower assembly slot section 103-2 is greater than the width of the upper assembly slot section 103-1, and the width of the lower assembly slot section 103-2 is greater than the width of the assembly slot tail section, the connection between the lower assembly slot section 103-2 and the upper assembly slot section 103-1 forms a first step structure, and the connection between the lower assembly slot section 103-2 and the assembly slot tail section is A second step structure is formed, the driven part 80a of the transmission element is arranged in the middle of the upper section 103-1 of the assembly groove, the transmission part 81a of the transmission element is arranged in the middle of the lower section 103-2 of the assembly groove, the transmission element spring limit platform 82a is limited and matched with the first step structure, the transmission element return spring 10 is arranged in the middle of the lower section 103-2 of the assembly groove, one end is limited and matched with the transmission element spring limit platform 82a, and the other end is limited and matched with the second step structure, and the free end of the transmission part 81a of the transmission element passes through the tail section of the assembly groove and is limited and matched with the switching element 9A.

[0105] Specifically, such as Figure 14 As shown, the upper section 103 - 1 of the assembly slot, the lower section 103 - 2 of the assembly slot and the tail section of the assembly slot are arranged in sequence from top to bottom and are connected in sequence; the transmission element assembly slot is located as a whole between the button mechanism 2 and the output terminal 881 .

[0106] It should be noted that, in this embodiment, the electric mechanism 3 directly drives the circuit breaker to close through the operating mechanism, and drives the circuit breaker to open through the button mechanism 2. As other embodiments, the electric mechanism 3 can also directly drive the circuit breaker to open and / or close through the operating mechanism, and drive the circuit breaker to open and / or close through the button mechanism 2, both of which are applicable to the manual-automatic switching device of the present invention.

[0107] Preferably, Figure 1 、 17 -20 shows the fourth embodiment of the circuit breaker of the present invention, which is the fourth embodiment of the first type of circuit breaker.

[0108] Preferably, Figure 1 、 17 As shown in Figure 18, the circuit breaker includes a circuit breaker housing 1, and a button mechanism 2, an electric mechanism 3, an operating mechanism 5, a protection mechanism, an arc extinguishing system 7, a current sampling device 112, an incoming terminal 880, and an outgoing terminal 881 arranged in the circuit breaker housing 1; the button mechanism 2 drives the circuit breaker to close / open through the operating mechanism 5; the electric mechanism 3 drives the circuit breaker to close / open through the button mechanism 2 and / or the operating mechanism 5; the protection mechanism cooperates with the operating mechanism 5 to trigger the circuit breaker to trip; the incoming terminal 880 and the outgoing terminal 881 are respectively arranged at both ends of the circuit breaker housing 1 The operating mechanism 5 is arranged in the middle of the circuit breaker housing 1; the arc extinguishing system 7 and the protection mechanism are arranged side by side between the operating mechanism 5 and the incoming terminal 880; the electric mechanism 3 is arranged between the outgoing terminal 881 and the operating mechanism 5, and the electric mechanism 3 and the outgoing terminal 881 are arranged on the same side of the button mechanism 2; one end of the button mechanism 2 protrudes outside the end of the circuit breaker housing 1 provided with the outgoing terminal 881; the current sampling device 112 is arranged between the protection mechanism and the incoming terminal 880, and the two ends of the sampling device 112 are electrically connected to the protection mechanism and the incoming terminal 880 respectively. The circuit breaker of the present invention has a reasonable internal layout design and a compact layout between the various components, which can effectively reduce the overall specifications of the circuit breaker and conform to the development trend of miniaturization of circuit breakers; moreover, the current sampling device 112 is arranged between the overload protection mechanism 110 or the short-circuit protection mechanism 6 arranged side by side with the arc extinguishing system 7 and the incoming terminal 880, which significantly improves the safety of the current sampling device 112 and facilitates the derivation of the signal of the current sampling device 112.

[0109] Preferably, the protection mechanism is a short-circuit protection mechanism 6 or an overload protection mechanism 110; when the circuit breaker includes both a short-circuit protection mechanism 6 and an overload protection mechanism 110, the protection mechanism is the short-circuit protection mechanism 6, the arc extinguishing system 7 and the short-circuit protection mechanism 6 are arranged side by side, the operating mechanism 5 and the overload protection mechanism 110 are arranged side by side in the middle of the circuit breaker housing 1, and the sampling device 112 is arranged between the short-circuit protection mechanism 6 and the incoming terminal 880; or, the protection mechanism is the overload protection mechanism 110, the arc extinguishing system 7 and the overload protection mechanism 110 are arranged side by side, the operating mechanism 5 and the short-circuit protection mechanism 6 are arranged side by side in the middle of the circuit breaker housing 1, and the sampling device 112 is arranged between the overload protection mechanism 110 and the incoming terminal 880.

[0110] Preferably, Figure 17 In the preferred embodiment shown, the operating mechanism 5 and the overload protection mechanism 110 are arranged side by side in the middle of the circuit breaker housing 1, the arc extinguishing system 7 and the short-circuit protection mechanism 6 are arranged side by side, the overload protection mechanism 110 and the arc extinguishing system 7 are located on one side of the circuit breaker housing 1, and the operating mechanism 5 and the short-circuit protection mechanism 6 are located on the other side of the circuit breaker housing 1; the current sampling device 112 is arranged between the short-circuit protection mechanism 6 and the incoming terminal 880, the incoming terminal 880 includes an L-pole incoming terminal, and the current sampling device 112 is connected in series between the short-circuit protection mechanism 6 and the L-pole incoming terminal. Further, as Figure 17 As shown, the circuit breaker housing 1 further includes a sampling device assembly groove 112a, and two ends of the sampling device assembly groove 112a are respectively opposite to the L-pole incoming terminal and the short-circuit protection mechanism 6.

[0111] In particular, the short-circuit protection mechanism 6 of the present invention includes an electromagnetic tripping mechanism. When a short circuit occurs, the electromagnetic force increases, triggering the operating mechanism 5 to trip. The overload protection mechanism 110 includes a bimetallic strip. When overloaded, the bimetallic strip bends, triggering the lock of the operating mechanism 5 to release the lock and trip the snap fit, causing the operating mechanism 5 to trip. No chip is required for detection and participation, thus avoiding external interference with the chip and achieving reliable protection. However, in order to monitor the current, a corresponding current sampling device 112 is provided, which can output to an external monitoring device. The present invention places the current sampling device 112 in an area away from the core components of the circuit breaker, which not only avoids affecting the core components of the circuit breaker, but also significantly improves the safety and reliability of the current sampling device 112.

[0112] Further, such as Figure 17 and 18As shown, the circuit breaker of the present invention further includes a circuit board 111 connected to the motor mechanism 3. The button mechanism 2, motor mechanism 3, operating mechanism 5, overload protection mechanism 110, arc extinguishing system 7, and current sampling device 112 are arranged on one side of the circuit board 111, and the bottom plate of the circuit breaker housing 1 is located on the other side of the circuit board 111. The circuit breaker of the present invention adopts the above-mentioned layout to arrange the circuit board 111, which can significantly increase the installation space of the circuit board 111 and reduce the size requirements of the circuit board 111. Firstly, the design and installation of the circuit board 111 are more convenient, and secondly, the circuit board 111 can also carry more functions.

[0113] Preferably, Figure 19 and 20 As shown, the circuit breaker also includes a circuit board slot 113 connected to the circuit board 111. The circuit board slot 113 and the incoming line terminal 880 are arranged at the same end of the circuit breaker housing 1. The incoming line terminal 880 includes an L-pole incoming line terminal and an N-pole incoming line terminal arranged side by side and spaced apart. The circuit board slot 113 is arranged between the two incoming line terminals 880. The circuit board 111 obtains working power and control signals through the circuit board slot 113.

[0114] Specifically, such as Figure 17 In the direction shown, the incoming terminal 880 and the outgoing terminal 881 are respectively arranged at the upper and lower ends of the circuit breaker housing 1, and the two incoming terminals 880 are respectively arranged side by side as the N-pole incoming terminal and the L-pole incoming terminal; the outgoing terminal 881 and the button mechanism 2 are arranged side by side, and the electric mechanism 3 is arranged below the outgoing terminal 881 and above the operating mechanism 5, and the electric mechanism 3 and the button mechanism 2 are arranged side by side; the overload protection mechanism 110 and the operating mechanism 5 are arranged side by side in the circuit breaker housing 1; the arc extinguishing system 7 and the short-circuit protection mechanism 6 are arranged side by side below the overload protection mechanism 110 and the operating mechanism 5; the current sampling device 112 is arranged between the short-circuit protection mechanism 6 and the incoming terminal 880, and is located on the right side of the circuit breaker housing 1; the sampling device assembly slot 112 is arranged between the short-circuit protection mechanism 6 and the L-pole incoming terminal, with the upper end opposite the short-circuit protection mechanism 6 and the lower end opposite the L-pole incoming terminal. It should be noted that, as another embodiment, the overload protection mechanism 110 and the short-circuit protection mechanism 6 can be interchanged, and the current sampling device 112 is then disposed between the overload protection mechanism 110 and the incoming terminal 880 .

[0115] It should be noted that in this embodiment, the electric mechanism 3 directly drives the circuit breaker to close via the operating mechanism and drives the circuit breaker to open via the button mechanism 2. As other embodiments, the electric mechanism 3 can also directly drive the circuit breaker to open and / or close via the operating mechanism and drive the circuit breaker to open and / or close via the button mechanism 2, all of which are applicable to the layout structure of this embodiment. In addition, the electric mechanism 3 in the fifth embodiment of the present invention controls the motor by controlling the power supply of the motor 301. Other similar solutions that control the motor 301 through a control chip and obtain the closing position, opening position, and initial position between the closing position and the opening position of the trigger gear through multiple position sensors (micro switches) are also applicable to the layout structure of this embodiment.

[0116] Preferably, Figure 21 and 22 FIG. 1 shows an embodiment of the current sampling device 112 .

[0117] like Figure 21 and 22 As shown, the current sampling device 112 is a manganese-copper shunt, including a manganese-copper alloy part 112-1 and a current-carrying copper strip. The two current-carrying copper strips are respectively connected to the two ends of the manganese-copper alloy part 112. The current sampling device 112 is also connected to the protection mechanism and the incoming terminal 880 through the two current-carrying copper strips.

[0118] Preferably, Figure 22 As shown, the width of the manganese-copper alloy portion 112-1 is less than or equal to the width of the current-carrying copper strip. Figure 22 As shown, the two current-carrying copper strips are a first current-carrying copper strip 112-2 and a second current-carrying copper strip 112-3 connected to both ends of the manganese-copper alloy part 112, and are respectively connected to the incoming terminal 880 (L-pole incoming terminal) and the protection mechanism (short-circuit protection mechanism 6); the first current-carrying copper strip 112-2 has the same width as the manganese-copper alloy part 112-1; the second current-carrying copper strip 112-3 has a width greater than that of the manganese-copper alloy part 112-1, and a copper strip connection finger connected to the protection mechanism is protruded from the lower side of the end of the second current-carrying copper strip 112-3 away from the manganese-copper alloy part 112-1.

[0119] Specifically, such as Figure 22 As shown, the arrangement direction of the second current-carrying copper strip 112-3, the manganese-copper alloy portion 112-1, and the first current-carrying copper strip 112-2 is the length direction of the current sampling device 112; the width of the current sampling device 112 is the distance between the side of the current sampling device 112 where the pin 112-4 is provided and the other side of the current sampling device 112; and the thickness of the current sampling device 112 is the distance between the side of the current sampling device 112 facing the reader and the other side of the current sampling device 112.

[0120] Preferably, Figure 22 As shown, the current sampling device 112 further includes two pins 112-4, each pin 112-4 is an L-shaped structure, one end of the two pins 112-4 is respectively connected to the two ends of one side of the manganese-copper alloy part 112-1, and the two pins 112-4 are overall in an L-shaped structure.

[0121] Preferably, Figure 21 and 22 As shown, the two pins 112-4 are connected to the circuit board 111 through two signal wires 112-5 respectively. The two signal wires 112-5 are twisted together, which is beneficial to reducing the impact of the power frequency magnetic field around the manganin shunt on the measurement accuracy of the manganin shunt. Furthermore, the two signal wires 112-5 are twisted together into a twisted structure.

[0122] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A circuit breaker, comprising a circuit breaker housing (1), and a button mechanism (2), an electric mechanism (3), an operating mechanism (5), a protection mechanism, an arc extinguishing system (7), a current sampling device (112), an incoming terminal (880), and an outgoing terminal (881) arranged in the circuit breaker housing (1); the button mechanism (2) drives the circuit breaker to close / open via the operating mechanism (5); the electric mechanism (3) drives the circuit breaker to close / open via the button mechanism (2) and / or the operating mechanism (5); the protection mechanism cooperates with the operating mechanism (5) to trigger the circuit breaker to trip; and is characterized in that: The incoming terminal (880) and the outgoing terminal (881) are respectively arranged at the lower end and the upper end of the circuit breaker housing (1); the operating mechanism (5) is arranged in the middle of the circuit breaker housing (1); the arc extinguishing system (7) and the protection mechanism are arranged side by side between the operating mechanism (5) and the incoming terminal (880); the electric mechanism (3) is arranged between the outgoing terminal (881) and the operating mechanism (5), and the electric mechanism (3) and the outgoing terminal (881) are arranged on the same side of the button mechanism (2); the current sampling device (112) is arranged between the protection mechanism and the incoming terminal (880), and both ends of the current sampling device (112) are electrically connected to the protection mechanism and the incoming terminal (880) respectively; The button mechanism (2) comprises a button member (201) and a connecting member (204) respectively slidably arranged on the circuit breaker housing (1), a first connecting rod (202) whose two ends are respectively connected to the button member (201) and the connecting member (204), and a second connecting member (203) whose two ends are respectively connected to the connecting member (204) and the transmission member (501) of the operating mechanism (5); the transmission member (501) is pivotally arranged on the circuit breaker housing (1); the button member (201) and the outlet terminal (881) are arranged side by side at the upper end of the circuit breaker housing (1), and the button member (201), the first connecting rod (202), the connecting member (204) and the second connecting rod (203) are arranged in sequence from top to bottom; and the electric mechanism (3) is arranged side by side with the connecting member (204) and the second connecting rod (203).

2. The circuit breaker according to claim 1, wherein: One end of the button mechanism (2) protrudes outside an end of the circuit breaker housing (1) provided with an outlet terminal (881).

3. The circuit breaker according to claim 1, wherein: The circuit breaker comprises a short-circuit protection mechanism (6) and an overload protection mechanism (110); the protection mechanism is the short-circuit protection mechanism (6), the arc extinguishing system (7) and the short-circuit protection mechanism (6) are arranged side by side, and the operating mechanism (5) and the overload protection mechanism (110) are arranged side by side in the middle of the circuit breaker housing (1); or the protection mechanism is the overload protection mechanism (110), the arc extinguishing system (7) and the overload protection mechanism (110) are arranged side by side, and the operating mechanism (5) and the short-circuit protection mechanism (6) are arranged side by side in the middle of the circuit breaker housing (1).

4. The circuit breaker according to claim 1, wherein: The protection mechanism is a short-circuit protection mechanism (6); the circuit breaker further comprises an overload protection mechanism (110); the operating mechanism (5) and the overload protection mechanism (110) are arranged side by side in the middle of the circuit breaker housing (1); the arc extinguishing system (7) and the short-circuit protection mechanism (6) are arranged side by side; the overload protection mechanism (110) and the arc extinguishing system (7) are located on one side of the circuit breaker housing (1); the operating mechanism (5) and the short-circuit protection mechanism (6) are located on the other side of the circuit breaker housing (1); the current sampling device (112) is arranged between the short-circuit protection mechanism (6) and the incoming line terminal (880); the incoming line terminal (880) comprises an L-pole incoming line terminal; and the current sampling device (112) is connected in series between the short-circuit protection mechanism (6) and the L-pole incoming line terminal.

5. The circuit breaker according to claim 3 or 4, characterized in that: The circuit breaker further comprises a circuit board (111) connected to the electric mechanism (3); the button mechanism (2), the electric mechanism (3), the operating mechanism (5), the overload protection mechanism (110), the arc extinguishing system (7) and the current sampling device (112) are arranged on one side of the circuit board (111); and the bottom plate of the circuit breaker housing (1) is located on the other side of the circuit board (111).

6. The circuit breaker according to claim 4, wherein: The circuit breaker housing (1) further comprises a sampling device assembly slot (112a), and two ends of the sampling device assembly slot (112a) are respectively opposite to the L-pole incoming terminal and the short-circuit protection mechanism (6).

7. The circuit breaker according to claim 3 or 4, characterized in that: The short-circuit protection mechanism (6) includes an electromagnetic tripping mechanism, and the overload protection mechanism (110) includes a bimetallic strip.

8. The circuit breaker according to claim 1, wherein: The current sampling device (112) is a manganese-copper shunt, comprising a manganese-copper alloy portion (112-1) and a current-carrying copper strip, wherein the two current-carrying copper strips are respectively connected to two ends of the manganese-copper alloy portion (112-1); the thickness of the manganese-copper alloy portion (112-1) is greater than the thickness of the current-carrying copper strip.

9. The circuit breaker according to claim 8, characterized in that: The width of the manganese-copper alloy portion (112-1) is less than or equal to the width of the current-carrying copper strip.

10. The circuit breaker according to claim 8, wherein: The current sampling device (112) further comprises two pins (112-4), each pin (112-4) is an L-shaped structure, one end of the two pins (112-4) is respectively connected to the two ends of one side of the manganese-copper alloy part (112-1), and the two pins (112-4) are formed into an L-shaped structure as a whole.

11. The circuit breaker according to claim 10, wherein: The circuit breaker further comprises a circuit board (111) connected to the electric mechanism (3); two pins (112-4) of the current sampling device (112) are respectively connected to the circuit board (111) via two signal wires (112-5), and the two signal wires (112-5) are twisted together.

12. The circuit breaker according to claim 8 or 9, characterized in that: The two current-carrying copper strips are a first current-carrying copper strip (112-2) and a second current-carrying copper strip (112-3) respectively connected to the two ends of the manganese-copper alloy part (112-1), and respectively connected to the incoming terminal (880) and the protection mechanism; the first current-carrying copper strip (112-2) has the same width as the manganese-copper alloy part (112-1); the second current-carrying copper strip (112-3) has a width greater than that of the manganese-copper alloy part (112-1), and a copper strip connection finger for connecting to the protection mechanism is protruded from the lower side of one end of the second current-carrying copper strip (112-3) away from the manganese-copper alloy part (112-1).

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