Solid state circuit breaker

Abstract

A solid state circuit breaker includes an electronic switch and a mechanical switch connected in series, the mechanical switch including: a handle microswitch configured to be actuated when a handle rotates to a closing position and released when the handle leaves the closing position, such that when the handle is in the closing position, the handle microswitch is in a handle micro-closing state, and when the handle is in the closing position, the handle microswitch is in a handle micro-closing state; when the handle leaves the closing position, the handle microswitch is in a handle micro-switch-off state; and the contact microswitch is configured to be actuated when the moving contact moves to the closing position and released when the moving contact leaves the closing position, so that when the moving contact is located at the closing position, the contact microswitch is in a contact micro-closing state, and when the moving contact leaves the closing position, the contact microswitch is in a contact micro-opening state. By detecting the states of the handle microswitch and the contact microswitch, when the solid-state circuit breaker is switched from opening to closing, the mechanical switch is switched on firstly, and the electronic switch is switched on later, and when the solid-state circuit breaker is switched from closing to opening, the electronic switch is switched on firstly, and the mechanical switch is switched off later.

Description

Technical Field

[0001] The invention relates to a solid-state circuit breaker. Background Art

[0002] The fast disconnection capability of solid-state circuit breakers is favored by more and more new energy applications such as photovoltaic storage and DC flexible, and DC solid-state circuit breakers with protection functions are also one of the requirements of industry applications. Solid-state circuit breakers include electronic switches and mechanical switches in series, and require that under normal circumstances, when opening with power on, the electronic switch is opened first, and the mechanical switch (de-energized) is opened later; when closing with power on, the mechanical switch is closed first (de-energized) and the electronic switch is closed later. Summary of the invention

[0003] According to the present invention, a solid-state circuit breaker is proposed, comprising an electronic switch and a mechanical switch connected in series, wherein the mechanical switch comprises: a housing; a handle, rotatably mounted to the housing between a closing position and an opening position; a moving contact and a stationary contact, wherein the moving contact is configured to be able to move between an opening position and a closing position, wherein the moving contact is not in contact with the stationary contact in the opening position, and the moving contact is in contact with the stationary contact in the closing position; a moving contact bracket, wherein the moving contact is mounted on the moving contact bracket; a transmission assembly, capable of transmitting the movement of the handle to the moving contact bracket to drive the moving contact to achieve contact and separation with the stationary contact; and a handle microswitch, mounted to the housing and configured to be actuated when the handle is rotated to the closing position and released when the handle leaves the closing position, so that when the When the handle is in the closing position, the handle microswitch is in the handle micro-closing state, and when the handle leaves the closing position, the handle micro-switch is in the handle micro-opening state; the contact micro-switch is installed in the housing and is configured to be actuated when the moving contact moves to the closed position and to be released when the moving contact leaves the closed position, so that when the moving contact is in the closed position, the contact micro-switch is in the contact micro-closing state, and when the moving contact leaves the closed position, the contact micro-switch is in the contact micro-opening state, wherein, by detecting the states of the handle micro-switch and the contact micro-switch, when the solid-state circuit breaker changes from open to closed, the mechanical switch is closed first and the electronic switch is closed later, and when the solid-state circuit breaker changes from closed to open, the electronic switch is opened first and the mechanical switch is opened later.

[0004] By adding a handle micro switch and a contact micro switch, the state of the handle and the state of the moving contact can be conveniently detected, and then the solid-state circuit breaker can be conveniently controlled to realize the function of the solid-state circuit breaker.

[0005] The solid-state circuit breaker according to the present invention may have one or more of the following features.

[0006] According to one embodiment, the moving contact support includes an actuating protrusion, and the contact microswitch is arranged near the end point of the movement path of the actuating protrusion during the closing process, so that when the moving contact support drives the moving contact to the closed position, the actuating protrusion actuates the contact microswitch to the contact micromovement closing state, and when the moving contact support drives the moving contact to leave the closed position, the actuating protrusion releases the contact microswitch to the contact micromovement opening state.

[0007] According to one embodiment, the solid-state circuit breaker includes an actuator, and the movement of the handle between the closing position and the opening position drives the actuator to move, and the handle microswitch is arranged near the end point of the movement path of the actuator during the closing process, so that when the handle moves to the closing position, the actuator is driven by the handle and actuates the handle microswitch to the handle micro-closed state, and when the handle leaves the closing position, the actuator is driven by the handle and releases the handle microswitch to the handle micro-opened state.

[0008] According to one embodiment, when the solid-state circuit breaker is manually switched from open to closed: the handle is manually rotated from the open position toward the closed position, and the movement of the handle is transmitted to the moving contact bracket through the transmission assembly, thereby driving the moving contact to move from the open position toward the closed position. When the moving contact reaches the closed position, the contact microswitch is actuated to the contact micromovement closed state, and the mechanical switch is closed. At the same time, when the handle moves to the closed position, the handle microswitch is actuated to the handle micromovement closed state. When the contact microswitch is in the contact micromovement closed state and the handle microswitch is in the handle micromovement closed state, the solid-state circuit breaker reaches the hot standby state. When the solid-state circuit breaker is in the hot standby state, if the electronic switch is closed, the solid-state circuit breaker is closed.

[0009] According to one embodiment, the solid-state circuit breaker further includes an electronically driven trip unit configured to trip when electronically driven so that the transmission assembly is actuated to switch the movable contact from the closed position to the open position.

[0010] According to one embodiment, the trip unit includes: an excitation coil wrapped with an insulating sheath; and a push rod assembly, which is driven and triggers tripping when the excitation coil is energized.

[0011] According to one embodiment, the solid-state circuit breaker further comprises an arc extinguishing chamber disposed near the stationary contact, and the tripping unit is disposed between the transmission assembly and the arc extinguishing chamber.

[0012] According to one embodiment, when the solid-state circuit breaker is manually switched from closed to open: the handle is manually rotated from the closed position toward the open position, and when the handle leaves the closed position, the handle microswitch is released to the handle micro-open state, and at this time, in response to the handle micro-open state of the handle microswitch, the electronic switch is opened, and then the electronic drive trip unit is actuated, and the transmission assembly is actuated to move the moving contact from the closed position to the open position, and when the moving contact leaves the closed position, the contact microswitch is released to the contact micro-open state, and when the moving contact reaches the open position, the mechanical switch is opened, thereby opening the solid-state circuit breaker.

[0013] According to one embodiment, when the solid-state circuit breaker is electronically driven from closed to open: the electronic switch is opened, and then the trip unit is electronically driven, the transmission assembly is actuated to move the moving contact from the closed position toward the open position, when the moving contact leaves the closed position, the contact microswitch is released to the contact micro-movement open state, when the moving contact reaches the open position, the mechanical switch is opened, and the solid-state circuit breaker is opened, and at the same time, the transmission assembly is actuated to move the handle from the closed position toward the open position, and when the handle leaves the closed position, the handle micro-switch is released to the handle micro-movement open state.

[0014] According to one embodiment, the electronic drive switches the solid-state circuit breaker from closed to open condition by remote triggering or when a fault occurs.

[0015] According to one embodiment, the solid-state circuit breaker further includes a mechanical synchronization mechanism for use in multi-stage use, wherein the mechanical synchronization mechanism includes: a transmission linkage connected to a portion of a multi-stage transmission assembly and configured to link the multi-stage transmission assembly; and a trip linkage connected to a multi-stage trip unit and configured to link the multi-stage trip unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings of the embodiments of the present invention, wherein the drawings are only used to illustrate some embodiments of the present invention, but not to limit all embodiments of the present invention thereto.

[0017] Figure 1 Schematic diagram showing that the mechanical switch of the solid-state circuit breaker according to the present invention is in an open state.

[0018] Figure 2 Schematic diagram showing that the mechanical switch of the solid-state circuit breaker according to the present invention is in a closed state.

[0019] Figure 3 Schematic diagram showing a mechanical synchronization mechanism of a solid-state circuit breaker according to the present invention when used in multiple stages.

[0020] Figure 4The flowchart of the solid-state circuit breaker manually switching from the disconnected state to the hot standby state according to the present invention.

[0021] Figure 5 It is a flow chart of manually switching from the closed state to the open state of the solid-state circuit breaker according to the present invention.

[0022] Figure 6 It is a flow chart of the solid-state circuit breaker from the closed state to the open state under electronic driving according to the present invention.

[0023] Reference numerals list

[0024] 1 Housing

[0025] 2 Handles

[0026] 3 Stationary contact

[0027] 4 Moving contact

[0028] 5 Moving contact bracket

[0029] 51 Actuating protrusion

[0030] 6 Transmission components

[0031] 7 Handle micro switch

[0032] 8-contact micro switch

[0033] 9 Trip unit

[0034] 101 Transmission Linkage

[0035] 102 Trip Link DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the technical solution of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described in conjunction with the drawings of specific embodiments of the present invention. The same figure marks in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Unless otherwise defined, the technical or scientific terms used herein shall have the usual meanings understood by persons of ordinary skill in the field to which the present invention belongs. The words "first", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" and the like mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0038] The present invention will be described in detail below by way of describing exemplary embodiments.

[0039] The solid-state circuit breaker according to the present invention includes an electronic switch and a mechanical switch connected in series. The electronic switch is also called a semiconductor switch, and the opening and closing of the electronic switch can be controlled by receiving an electrical signal. The mechanical switch includes: a housing 1; a handle 2, which is rotatably mounted to the housing 1 between a closing position and an opening position; a moving contact 4 and a stationary contact 3, the moving contact 4 is configured to be able to move between an opening position and a closing position, in which the moving contact 4 is not in contact with the stationary contact 3, and in which the moving contact 4 is in contact with the stationary contact 3 in the closing position; a moving contact bracket 5, on which the moving contact 4 is mounted; and a transmission assembly 6, which can transmit the movement of the handle 2 to the moving contact bracket 5, so as to drive the moving contact 4 to achieve contact and separation with the stationary contact 3.

[0040] like Figure 1 and 2 As shown, the mechanical switch of the solid-state circuit breaker according to the present invention may further include a handle micro switch 7 and a contact micro switch 8.

[0041] The handle micro switch 7 is mounted to the housing 1 and is configured to be actuated when the handle 2 rotates to the closing position and released when the handle 2 leaves the closing position, so that when the handle 2 is in the closing position, the handle micro switch 7 is in the handle micro closing state, and when the handle 2 leaves the closing position, the handle micro switch 7 is in the handle micro opening state. Specifically, the actuator configured to actuate and release the handle micro switch 7 can be provided on the handle 2 or on the transmission assembly 6. The movement of the handle 2 between the closing position and the opening position drives the actuator to move, and the handle micro switch 7 is provided near the end point of the movement path of the actuator during the closing process, so that when the handle 2 moves to the closing position, the actuator is driven by the handle 2 and actuates the handle micro switch 7 to the handle micro closing state, and when the handle 2 leaves the closing position, the actuator is driven by the handle 2 and releases the handle micro switch 7 to the handle micro opening state. By providing the handle micro switch 7, it is possible to conveniently detect whether the handle 2 is in the closing position, thereby controlling the solid-state circuit breaker according to whether the handle 2 is in the closing position.

[0042] The contact micro switch 8 is mounted to the housing 1 and is configured to be actuated when the moving contact 4 moves to the closed position and released when the moving contact 4 leaves the closed position, so that when the moving contact 4 is in the closed position, the contact micro switch 8 is in the contact micro closed state, and when the moving contact 4 leaves the closed position, the contact micro switch 8 is in the contact micro open state. Specifically, an actuating member configured to actuate and release the handle micro switch 7 can be provided on the moving contact bracket 5. For example, the moving contact bracket 5 includes an actuating protrusion 51, and the contact micro switch 8 is provided near the end point on the movement path of the actuating protrusion 51 during the closing process, so that when the moving contact bracket 5 drives the moving contact 4 to move to the closed position, the actuating protrusion 51 actuates the contact micro switch to the contact micro closed state, and when the moving contact bracket 5 drives the moving contact 4 to leave the closed position, the actuating protrusion 51 releases the contact micro switch 8 to the contact micro open state. By providing the contact micro switch 8, it is convenient to detect whether the moving contact 4 is in the closed position, thereby controlling the solid-state circuit breaker according to whether the moving contact 4 is in the closed position (ie, whether the mechanical switch is in the closed state).

[0043] By adding the handle micro switch 7 and the contact micro switch 8, the state of the handle 2 and the state of the moving contact 4 can be conveniently detected, and the solid-state circuit breaker can be conveniently controlled to achieve that when the solid-state circuit breaker changes from open to closed, the mechanical switch is closed first and the electronic switch is closed later, and when the solid-state circuit breaker changes from closed to open, the electronic switch is opened first and the mechanical switch is opened later.

[0044] The solid-state circuit breaker according to the present invention may further include an electronically driven tripping unit 9, which may be disposed near the transmission assembly 6 and configured to trip when electronically driven, so that the transmission assembly 6 is actuated to switch the moving contact 4 from the closed position to the open position. In other words, the solid-state circuit breaker according to the present invention may have an electronically driven tripping function, and the tripping is performed by electrical signal control. Specifically, the electronically driven tripping unit 9 may include an excitation coil wrapped with an insulating sheath and a push rod assembly. When the excitation coil is energized, the push rod assembly is driven to trigger the tripping, for example, when the push rod assembly is driven, it hits a portion of the transmission assembly 6, causing the moving contact bracket 5 to drive the moving contact 4 to the open position.

[0045] The mechanical switch of the solid-state circuit breaker according to the present invention may further include an arc extinguishing chamber, which is disposed near the stationary contact and configured to guide and extinguish an arc generated when the movable contact and the stationary contact are separated.

[0046] like Figure 1 and Figure 2 As shown, the mechanical switch of the solid-state circuit breaker according to the present invention starts from the upper handle 2, and drives the moving contact bracket 5 at the lower right through the transmission assembly 6 extending from the bottom of the handle 2 to the middle, thereby driving the moving contact 4 to move, the static contact 3 is arranged on the left side of the moving contact 4, the arc extinguishing chamber is arranged on the left side of the static contact 3, and the electronically driven tripping unit 9 is arranged between the transmission assembly 6 and the arc extinguishing chamber in the vertical direction. The whole design is particularly compact, and the whole layout and the setting of the arc extinguishing chamber enable the mechanical switch to have the function of being opened with power on, that is, when the electronic switch fails, the mechanical switch can still be opened with power on, especially under the condition of high voltage DC, the mechanical switch can still have the breaking capacity, and the open state meets the requirements of the isolation contact.

[0047] The solid-state circuit breaker according to the present invention may have multiple stages. When having multiple stages, the solid-state circuit breaker may further include a mechanical synchronization mechanism for use in multiple stages. Specifically, Figure 3 As shown, the mechanical synchronization mechanism may include: a transmission linkage 101, connected to a part of the multi-stage transmission assembly 6 and configured to link the multi-stage transmission assembly 6; and a tripping linkage 102, connected to the multi-stage tripping unit 9 and configured to link the multi-stage tripping unit 9. Under the action of the mechanical synchronization mechanism, the handle 2 can simultaneously and synchronously drive the multi-stage transmission assembly 6 to move, and the tripping unit 9 can simultaneously and synchronously trip the multi-stage.

[0048] Figure 4 The flowchart of the solid-state circuit breaker manually switching from the disconnected state to the hot standby state according to the present invention. Figure 5 It is a flow chart of manually switching from the closed state to the open state of the solid-state circuit breaker according to the present invention. Figure 6 Flow chart of the solid-state circuit breaker from closed to open state under electronic drive according to the present invention. Figure 4-6 , describing the logic design of various state transitions of the solid-state circuit breaker according to the present invention.

[0049] It should be noted that, since the mechanical switch and the electronic switch of the solid-state circuit breaker are connected in series, when the mechanical switch and the electronic switch are both in the closed state, the solid-state circuit breaker is in the closed state; when the mechanical switch and the electronic switch are both in the open state, the solid-state circuit breaker is in the open state; when the mechanical switch is in the closed state and the electronic switch is in the open state, the solid-state circuit breaker is in the hot standby state. When the solid-state circuit breaker is in the hot standby state, as long as the electronic switch is closed through an electrical signal, the solid-state circuit breaker will enter the closed state accordingly.

[0050] Manually switch the solid-state circuit breaker from open to closed: Figure 4 , manually rotate the handle 2 from the opening position toward the closing position, and the movement of the handle 2 is transmitted to the moving contact bracket 5 through the transmission assembly 6, thereby driving the moving contact 4 to move from the opening position to the closing position. When the moving contact 4 reaches the closing position, the contact microswitch 8 is actuated to the contact micro-movement closing state, and the mechanical switch is closed. At the same time, when the handle 2 moves to the closing position, the handle microswitch 7 is actuated to the handle micro-movement closing state. When the contact microswitch 8 is in the contact micro-movement closing state and the handle microswitch 7 is in the handle micro-movement closing state, the solid-state circuit breaker reaches the hot standby state. At this time, if the electronic drive electronic switch is closed, the solid-state circuit breaker is closed.

[0051] Manually switch the solid-state circuit breaker from closed to open: Figure 5 , manually rotate the handle 2 from the closing position toward the opening position. When the handle 2 leaves the closing position, the handle microswitch 7 is released to the handle micro-opening state. At this time, in response to the handle micro-opening state of the handle microswitch 7, the electronic switch opens, and then the electronic drive trip unit 9 is actuated. The transmission assembly 6 is actuated to move the moving contact 4 from the closing position toward the opening position. When the moving contact 4 leaves the closing position, the contact microswitch 8 is released to the contact micro-opening state. When the moving contact 4 reaches the opening position, the mechanical switch opens, and thus the solid-state circuit breaker opens.

[0052] It should be noted that, when the solid-state circuit breaker is manually switched from closed to open, although when the handle 2 is manually rotated from the closed position to the open position, in theory the handle 2 drives the transmission assembly 6 and thus drives the moving contact 4 to move toward the open position, but since the handle microswitch in the open state triggers the electronic switch to open, and then triggers the electronically driven trip unit 9, and the electronic trip is usually faster than the mechanical transmission, the driving force of the transmission assembly 6 and the moving contact 4 from closed to open usually comes from the electronically driven trip unit 9, rather than from the drive of the handle 2. In addition, since the handle 2 can release the handle microswitch 7 when it leaves the closed position, and then triggers the electronic trip to make the moving contact 4 reach the open position, even if the operator regrets during the process of manually rotating the handle 2 from the closed position to the open position or the handle 2 is stuck and cannot completely reach the open position during the process, the solid-state circuit breaker will be electronically driven to the open state, thereby ensuring the safety of the circuit.

[0053] The electronic drive switches the solid-state circuit breaker from closed to open: Figure 6 As shown, by remote control or in a fault situation, the electronic switch is electronically driven to open, and then the trip unit 9 is electronically driven, the transmission assembly 6 is actuated to move the moving contact 4 from the closed position toward the open position, when the moving contact 4 leaves the closed position, the contact microswitch 8 is released to the contact micromovement open state, when the moving contact 4 reaches the open position, the mechanical switch opens, the solid-state circuit breaker opens, and at the same time, the transmission assembly 6 is actuated to move the handle 2 from the closed position toward the open position, when the handle 2 leaves the closed position, the handle microswitch 7 is released to the handle micromovement open state.

[0054] It should be noted that the transmission assembly 6 can reversely drive the handle 2 from the closing position to the opening position during the process of switching from closing to opening. However, a breakpoint is provided in the transmission assembly 6. When the handle 2 is stuck, the part of the transmission assembly 6 close to the moving contact bracket 5 can still switch from closing to opening in the case of tripping, allowing the tripping function to be realized.

[0055] The exemplary implementation of the solid-state circuit breaker proposed in the present invention is described in detail above with reference to the preferred embodiments. However, it can be understood by those skilled in the art that, without departing from the concept of the present invention, various modifications and variations can be made to the above-mentioned specific embodiments, and various technical features and structures proposed in the present invention can be combined in various ways without exceeding the protection scope of the present invention.

Claims

1. A solid-state circuit breaker, comprising an electronic switch and a mechanical switch connected in series, wherein the mechanical switch comprises: case; a handle rotatably mounted to the housing between a closed position and an open position; A movable contact and a stationary contact, wherein the movable contact is configured to be movable between an open position and a closed position, wherein the movable contact is not in contact with the stationary contact in the open position and the movable contact is in contact with the stationary contact in the closed position; A moving contact bracket, wherein the moving contact is mounted on the moving contact bracket; A transmission assembly capable of transmitting the movement of the handle to the moving contact bracket to drive the moving contact to make contact with and separate from the stationary contact; A handle micro switch is mounted on the housing and is configured to be actuated when the handle is rotated to the closing position and released when the handle leaves the closing position, so that when the handle is in the closing position, the handle micro switch is in a handle micro closed state, and when the handle leaves the closing position, the handle micro switch is in a handle micro open state; A contact micro switch is mounted to the housing and is configured to be actuated when the moving contact moves to the closed position and released when the moving contact leaves the closed position, so that when the moving contact is in the closed position, the contact micro switch is in a contact micro closed state, and when the moving contact leaves the closed position, the contact micro switch is in a contact micro open state. Among them, by detecting the status of the handle micro switch and the contact micro switch, when the solid-state circuit breaker changes from open to closed, the mechanical switch closes first and the electronic switch closes later, and when the solid-state circuit breaker changes from closed to open, the electronic switch opens first and the mechanical switch opens later.

2. The solid-state circuit breaker according to claim 1, wherein: The moving contact bracket includes an actuating protrusion, and the contact microswitch is arranged near the end point of the movement path of the actuating protrusion during the closing process, so that when the moving contact bracket drives the moving contact to move to the closed position, the actuating protrusion actuates the contact microswitch to the contact micromovement closing state, and when the moving contact bracket drives the moving contact to leave the closed position, the actuating protrusion releases the contact microswitch to the contact micromovement opening state.

3. The solid-state circuit breaker according to claim 1, wherein: The solid-state circuit breaker includes an actuator, and the movement of the handle between the closing position and the opening position drives the actuator to move. The handle microswitch is arranged near the end point of the movement path of the actuator during the closing process, so that when the handle moves to the closing position, the actuator is driven by the handle and actuates the handle microswitch to the handle micro-closed state, and when the handle leaves the closing position, the actuator is driven by the handle and releases the handle microswitch to the handle micro-opened state.

4. The solid-state circuit breaker according to any one of claims 1 to 3, wherein: When the solid-state circuit breaker is manually switched from open to closed: Manually rotate the handle from the opening position toward the closing position, and the movement of the handle is transmitted to the moving contact bracket through the transmission assembly, thereby driving the moving contact to move from the opening position toward the closing position. When the moving contact reaches the closing position, the contact microswitch is actuated to the contact micro-movement closing state, and the mechanical switch is closed. At the same time, when the handle moves to the closing position, the handle microswitch is actuated to the handle micro-movement closing state. When the contact microswitch is in the contact micro-movement closing state and the handle microswitch is in the handle micro-movement closing state, the solid-state circuit breaker reaches the hot standby state. When the solid-state circuit breaker is in the hot standby state, if the electronic switch is closed, the solid-state circuit breaker is closed.

5. The solid-state circuit breaker according to any one of claims 1 to 3, further comprising an electronically driven trip unit configured to trip when electronically driven, so that the transmission assembly is actuated to switch the movable contact from the closed position to the open position.

6. The solid-state circuit breaker according to claim 5, wherein: The trip unit comprises: an excitation coil wrapped with an insulating sheath; The push rod assembly is driven and triggers the tripping when the excitation coil is energized.

7. The solid-state circuit breaker according to claim 5, further comprising an arc extinguishing chamber arranged near the static contact, and the tripping unit is arranged between the transmission assembly and the arc extinguishing chamber.

8. The solid-state circuit breaker according to claim 5, wherein: When the solid-state circuit breaker is manually switched from closed to open: Manually rotate the handle from the closing position toward the opening position. When the handle leaves the closing position, the handle microswitch is released to the handle micro-opening state. At this time, in response to the handle micro-opening state of the handle micro-switch, the electronic switch opens, and then the electronic drive trip unit is actuated. The transmission assembly is actuated to move the moving contact from the closing position toward the opening position. When the moving contact leaves the closing position, the contact micro-switch is released to the contact micro-opening state. When the moving contact reaches the opening position, the mechanical switch opens, thereby opening the solid-state circuit breaker.

9. The solid-state circuit breaker according to claim 5, wherein: In the case where the electronic drive switches the solid-state circuit breaker from closed to open: The electronic switch opens, and then the electronically driven trip unit is driven, the transmission assembly is actuated to move the moving contact from the closed position toward the open position, when the moving contact leaves the closed position, the contact microswitch is released to the contact micro-movement open state, when the moving contact reaches the open position, the mechanical switch opens, the solid-state circuit breaker opens, and at the same time, the transmission assembly is actuated to move the handle from the closed position toward the open position, when the handle leaves the closed position, the handle micro-switch is released to the handle micro-movement open state.

10. The solid-state circuit breaker according to claim 9, wherein: Electronic actuation switches solid-state circuit breakers from closed to open conditions either remotely or when a fault occurs.

11. The solid-state circuit breaker according to any one of claims 1 to 3, further comprising a mechanical synchronization mechanism for multi-stage use, the mechanical synchronization mechanism comprising: A transmission linkage, connected to a portion of the multi-stage transmission assembly and configured to link the multi-stage transmission assembly; as well as The tripping linkage is connected to the multi-stage tripping units and is configured to link the multi-stage tripping units.

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