Circuit breaker and power protection system

Abstract

The application relates to the field of low-voltage electrical apparatus, in particular to a circuit breaker, which comprises a main contact system, a positive circuit with a positive input end and a positive output end, a negative circuit with a negative input end and a negative output end, the main contact system being connected between the positive input end and the positive output end and / or connected between the negative input end and the negative output end; the circuit breaker further comprises a driving circuit and an executing mechanism connected between the positive circuit and the negative circuit in sequence, the driving circuit comprising a one-way conducting element, the current conducting direction of the one-way conducting element being from the negative circuit of the circuit breaker to the positive circuit of the circuit breaker, the executing mechanism being powered to act when the driving circuit is turned on, and the main contact system C is prevented from being closed; the circuit breaker can avoid wiring errors; the application further relates to a power supply protection system comprising the circuit breaker, the driving circuit and the executing mechanism of which can avoid wiring errors.

Description

TECHNICAL FIELD

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

[0002] The circuit breaker refers to a switching device capable of closing, carrying and opening the current under normal circuit conditions and capable of closing, carrying and opening the current under abnormal circuit conditions within a specified time. When the circuit breaker is connected to the power supply system, it can be operated according to the working state of the power grid equipment, and can be used to cut off and connect the load circuit, and cut off the fault circuit to prevent the accident from expanding, and has the effect of ensuring the safe operation of the power grid equipment.

[0003] When the load connected to the circuit breaker is a battery type power supply facility, it is easy to cause safety hazards due to incorrect connection of the battery (the positive and negative poles of the battery are connected in reverse). SUMMARY

[0004] The purpose of the present application is to overcome the defects of the prior art and provide a circuit breaker whose drive circuit and actuating mechanism can avoid wiring errors.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] A circuit breaker comprises a main contact system C, a positive pole circuit having a positive pole input end and a positive pole output end, a negative pole circuit having a negative pole input end and a negative pole output end, the main contact system C being connected between the positive pole input end and the positive pole output end and / or connected between the negative pole input end and the negative pole output end; the circuit breaker further comprises a drive circuit 1 and an actuating mechanism 2 connected in sequence between the positive pole circuit and the negative pole circuit, the drive circuit 1 comprising a unidirectional conduction element, the current conduction direction of the unidirectional conduction element being from the negative pole circuit of the circuit breaker to the positive pole circuit of the circuit breaker, the actuating mechanism 2 being actuated to act when the drive circuit 1 is turned on, and preventing the main contact system C from being closed.

[0007] Preferably, an operating mechanism for driving the closing and opening of the main contact system C is included, and the actuating mechanism 2 is actuated to drive the operating mechanism to prevent the main contact system C from being closed.

[0008] Preferably, the unidirectional conduction element is a diode, the anode of the diode being connected to the negative pole circuit, and the cathode of the diode being connected to the positive pole circuit.

[0009] Preferably, the operating mechanism comprises a locking member and a jumping member in snap-fit; the actuating mechanism 2 is actuated to drive the jumping member to rotate to release the snap-fit with the locking member, so that the operating mechanism is tripped to prevent the main contact system C from being closed.

[0010] Preferably, the operating mechanism further comprises a handle, a transmission link and a rotating plate, the handle and the rotating plate are respectively pivotally arranged, the lock catch and the jump catch are respectively pivotally arranged on the rotating plate and are snap-fitted, the handle is connected with the lock catch through the transmission link, and the rotating plate is connected with the driving contact Co.

[0011] Preferably, the driving circuit 1 and the actuating mechanism 2 are connected between the negative output end and the positive output end, and the current conduction direction of the unidirectional conduction element is from the negative output end of the circuit breaker to the positive output end of the circuit breaker.

[0012] Preferably, the actuating mechanism 2 is an electromagnetic actuating mechanism.

[0013] Preferably, the electromagnetic actuating mechanism is a split-field release.

[0014] Preferably, the circuit breaker further comprises a linkage switch K linked with the driving contact Co and kept in an open state, and the linkage switch K is connected in series with the actuating mechanism 2; when the operating mechanism drives the driving contact Co to be closed with the main static contact C1, the linkage switch K is closed prior to the main contact system C, and the actuating mechanism 2 is powered to act.

[0015] Preferably, the actuating mechanism 2 is an electric operating device, the electric operating device comprises a motor connected in series with the driving circuit 1 and a transmission gear set connected with the motor in a driving manner, and the electric operating device prevents the main contact system C from being closed through the transmission gear set.

[0016] Preferably, the electric operating device is driven in cooperation with the operating mechanism, so that the circuit breaker is automatically closed / opened.

[0017] Preferably, the circuit breaker further comprises an overload protection mechanism 4 and a short-circuit protection mechanism 3 respectively cooperating with the operating mechanism.

[0018] Preferably, the circuit breaker comprises a breaking pole circuit and a through pole circuit; the breaking pole circuit comprises a breaking pole input end, a breaking pole output end and the main contact system C connected in series between the breaking pole input end and the breaking pole output end; the through pole circuit comprises a through pole input end and a through pole output end connected through a conductor.

[0019] The breaking pole circuit is a negative pole circuit, the through pole circuit is a positive pole circuit, the breaking pole input end and the breaking pole output end are respectively a negative input end and a negative output end, and the through pole input end and the through pole output end are respectively a positive input end and a positive output end; or the breaking pole circuit is a positive pole circuit, the through pole circuit is a negative pole circuit, the breaking pole input end and the breaking pole output end are respectively a positive input end and a positive output end, and the through pole input end and the through pole output end are respectively a negative input end and a negative output end.

[0020] A power protection system comprises the circuit breaker, the circuit breaker is connected between a load battery L0 and a power source E0, two poles of the load battery L0 are connected with positive and negative output terminals of the circuit breaker respectively; when the two poles of the load battery L0 are connected correctly, a driving circuit 1 of the circuit breaker is not conducted; when the two poles of the load battery L0 are connected incorrectly, the driving circuit 1 of the circuit breaker is conducted, an executing mechanism 2 of the circuit breaker is powered to act, and the main contact system C of the circuit breaker is prevented from being closed.

[0021] The circuit breaker of the application has the driving circuit 1 and the executing mechanism 2 connected in series in the positive circuit and the negative circuit, the driving circuit 1 comprises a one-way conducting element, the current conducting direction of the one-way conducting element is from the negative circuit of the circuit breaker to the positive circuit of the circuit breaker, when the power source E0 and the load battery L0 are connected correctly, the driving circuit 1 is not conducted, when the power source E0 or the load battery L0 is connected incorrectly, namely the positive output terminal and the negative output terminal of the circuit breaker are connected with the negative pole and the positive pole of the load battery L0 respectively, the driving circuit 1 is conducted, the executing mechanism 2 acts to prevent the main contact system C from being closed, thereby avoiding the load battery L0 from being burned and the like due to the connection error.

[0022] In addition, when the executing mechanism 2 comprises components which are not suitable for long-time power-on, the linkage switch K can keep the open state before the user performs the closing operation, so that the executing mechanism 2 is powered off, and only when the user performs the closing operation, the executing mechanism 2 is powered on to act, thereby avoiding the executing mechanism 2 from being damaged due to long-time power-on, and prolonging the service life of the executing mechanism 2.

[0023] The application further provides a power protection system, the load battery is charged by the power source through the circuit breaker of the application, when the connection is incorrect, the circuit breaker cannot be closed or tripped, thereby avoiding the load battery L0 from being burned and the like due to the connection error. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 Fig. 1 is a structural schematic diagram of the circuit breaker of the application;

[0025] Figure 2 Fig. 2 is a connection structural schematic diagram of the circuit breaker and the load battery L0, the two poles of the load battery L0 are connected correctly, namely the positive output terminal and the negative output terminal of the circuit breaker are connected with the positive pole and the negative pole of the load battery L0 respectively;

[0026] Figure 3 Fig. 3 is a connection structural schematic diagram of the circuit breaker and the load battery L0, the two poles of the load battery L0 are connected incorrectly, namely the positive output terminal and the negative output terminal of the circuit breaker are connected with the negative pole and the positive pole of the load battery L0 respectively;

[0027] Figure 4 It is a schematic structural diagram of the circuit breaker of the present invention, wherein the driving circuit includes a diode;

[0028] Figure 5 It is a structural diagram of the circuit breaker of the present invention, wherein a linkage switch K is connected in series between the drive circuit and the actuator;

[0029] Figure 6 It is a structural diagram of the circuit breaker of the present invention, which at least shows the arrangement relationship of the operating mechanism, the actuator, the overload protection mechanism, the short-circuit protection mechanism and the arc extinguishing chamber. DETAILED DESCRIPTION

[0030] The following is combined with Figures 1-5 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.

[0031] A circuit breaker includes a main contact system C, a positive circuit having a positive input terminal and a positive output terminal, and a negative circuit having a negative input terminal and a negative output terminal. The main contact system C is connected between the positive input terminal and the positive output terminal and / or between the negative input terminal and the negative output terminal. The circuit breaker also includes a drive circuit 1 and an actuator 2 connected in sequence between the positive circuit and the negative circuit. The drive circuit 1 includes a unidirectional conductive element. The current conduction direction of the unidirectional conductive element is from the negative circuit of the circuit breaker to the positive circuit of the circuit breaker. When the drive circuit 1 is turned on, the actuator 2 is energized and actuated to prevent the main contact system C from closing.

[0032] The circuit breaker of the present invention has a drive circuit 1 and an actuator 2 connected to the positive circuit and the negative circuit. The drive circuit 1 includes a unidirectional conductive element. The current conducting direction of the unidirectional conductive element is to flow from the negative circuit of the circuit breaker to the positive circuit of the circuit breaker. When the E0 power supply and the load battery L0 are connected correctly, the drive circuit 1 is not conductive. When the E0 power supply or the load battery L0 is connected incorrectly (that is, the positive output terminal and the negative output terminal of the circuit breaker are connected to the negative electrode and the positive electrode of the load battery L0, respectively), the drive circuit 1 is conductive and the actuator 2 is activated to prevent the main contact system C from closing, thereby avoiding situations such as the load battery L0 being burned due to the wiring error.

[0033] Preferably, Figures 1-5 As shown, the driving circuit 1 and the actuator 2 are connected in series between the positive circuit and the negative circuit in sequence.

[0034] Preferably, the circuit breaker comprises an operating mechanism for driving the closing and opening of the main contact system C, and the actuating mechanism 2 is in driving cooperation with the operating mechanism to prevent the closing of the main contact system C when the actuating mechanism 2 is energized. In one embodiment, the operating mechanism comprises a latch member and a trip member in snap cooperation; the actuating mechanism 2 drives the trip member to rotate and release the snap cooperation with the latch member to trip the operating mechanism to prevent the closing of the main contact system C.

[0035] Preferably, the unidirectional conducting element is a diode.

[0036] Preferably, the actuating mechanism 2 is an electromagnetic actuating mechanism or an electrically operated device.

[0037] Preferably, the circuit breaker further comprises a linkage switch K linked with the main movable contact C0 and kept in an open state, and the linkage switch K is in series connection with the actuating mechanism 2; when the operating mechanism drives the main movable contact C0 to close with the main fixed contact C1, the linkage switch K is closed prior to the closing of the main contact system C, and the actuating mechanism 2 is energized. When the actuating mechanism 2 comprises components that are not suitable for long-time energization, the linkage switch K can keep the actuating mechanism 2 in a de-energized state before the user performs the closing operation, and the actuating mechanism 2 is energized only when the user performs the closing operation, thereby avoiding the damage of the actuating mechanism 2 caused by long-time energization and prolonging the service life of the actuating mechanism 2. It should be noted that the core function of the linkage switch K is to open / close the circuit branch formed by the driving circuit 1, the linkage switch K and the actuating mechanism 2, and therefore the specific connection position of the linkage switch K is not limited, as long as the linkage switch K is arranged in the circuit branch and in series connection with the actuating mechanism 2, that is, the linkage switch K can be connected in series between the driving circuit 1 and the actuating mechanism 2, or the linkage switch K, the driving circuit 1 and the actuating mechanism 2 are connected in series, or the driving circuit 1, the actuating mechanism 2 and the linkage switch K are connected in series, and the above three modes can all achieve the core function of the linkage switch K.

[0038] It should be noted that the circuit breaker of the present application can be a plug-in circuit breaker, a molded case circuit breaker or other small-sized circuit breaker with an operating mechanism.

[0039] The circuit breaker of the present application will be further described below in combination with the accompanying drawings and specific embodiments.

[0040] As shown in Figure 1 FIG. 1 is an embodiment of the circuit breaker CB of the present application.

[0041] As shown in Figure 1As shown in the figure, the circuit breaker CB of the present application comprises a circuit breaker shell (not shown in the figure) and a breaking pole circuit and a through pole circuit arranged in the circuit breaker shell respectively; the breaking pole circuit comprises a breaking pole input end, a breaking pole output end, an operating mechanism and a main contact system C connected in series between the breaking pole input end and the breaking pole output end, the main contact system C comprises a main movable contact C0 and a main fixed contact C1 used in cooperation, and the main movable contact C0 is drivingly connected with the operating mechanism; the through pole circuit comprises a through pole input end, a through pole output end and a through pole conductor connected in series between the through pole input end and the through pole output end; the circuit breaker further comprises a driving circuit 1 and an executing mechanism 2 connected in series between the breaking pole circuit and the through pole circuit, and the driving circuit 1 is connected with the breaking pole output end.

[0042] As shown in the figure, Figure 1 In the embodiment, the breaking pole circuit is a negative pole circuit, the through pole circuit is a positive pole circuit, the breaking pole input end and the breaking pole output end are a negative pole input end and a negative pole output end respectively, the through pole input end and the through pole output end are a positive pole input end and a positive pole output end respectively, the driving circuit 1 and the executing mechanism 2 are connected in series between the negative pole output end and the positive pole output end, and the driving circuit 1 comprises a unidirectional conduction element connected in series with the executing mechanism 2, the current conduction direction of the unidirectional conduction element is from the negative pole output end of the circuit breaker to the positive pole output end of the circuit breaker, and in the embodiment, the current conduction direction of the unidirectional conduction element is from the breaking pole output end to the through pole output end.

[0043] It should be pointed out that the through pole circuit means that there is no break in the circuit, that is, the through pole input end and the through pole output end are directly connected through the conductor, and no corresponding movable contact and fixed contact are arranged. In the embodiment, the circuit breaker is provided with one breaking pole circuit and one through pole circuit, and obviously, two breaking pole circuits can also be arranged as the positive pole circuit and the negative pole circuit of the circuit breaker according to the need.

[0044] Moreover, the polarity of the breaking pole circuit and the through pole circuit can also be interchanged, that is, the breaking pole circuit is a positive pole circuit, the through pole circuit is a negative pole circuit, the breaking pole input end and the breaking pole output end are a positive pole input end and a positive pole output end respectively, the through pole input end and the through pole output end are a negative pole input end and a negative pole output end respectively, and most of the circuit breakers are arranged in this way, and at this time, the current conduction direction of the unidirectional conduction element is still from the negative pole output end of the circuit breaker to the positive pole output end of the circuit breaker, that is, the current conduction direction of the unidirectional conduction element is from the through pole output end to the breaking pole output end.

[0045] Further, as shown in the figure, Figure 4 The unidirectional conduction element is a diode, the anode of the diode is connected with the negative pole output end of the circuit breaker, and the cathode of the diode is connected with the positive pole output end of the circuit breaker. Specifically, as shown in the figure, Figure 4The current conduction direction of the unidirectional conduction element in the embodiment is from the open-circuit pole circuit to the through-pole circuit.

[0046] As shown in Figure 2 and 3 The circuit breaker in the embodiment is connected between the load battery L0 and the power source E0. In actual use, the power source E0 charges the load battery L0 through the circuit breaker, and the positive and negative poles of the power source E0 are connected to the positive input end and the negative input end respectively. When the load battery L0 is connected to the circuit breaker, the following two cases occur.

[0047] Case one, the two-pole input end of the load battery L0 is correctly connected, as shown in Figure 2 The positive output end and the negative output end of the circuit breaker are connected to the battery positive pole and the battery negative pole of the load battery L0 respectively, and the driving circuit 1 is connected to the battery negative pole of the load battery L0 through the negative output end. Since the single-phase conduction of the diode, the driving circuit 1 is not conducting at this time.

[0048] Case two, the two-pole input end of the load battery L0 is incorrectly connected, as shown in Figure 3 The positive output end and the negative output end of the circuit breaker are connected to the battery negative pole and the battery positive pole of the load battery L0 respectively, and the driving circuit 1 is connected to the battery positive pole of the load battery L0 through the negative output end. The diode is conducting, so the actuator 2 is powered to act, preventing the main contact system C from closing, thereby preventing the load battery L0 from being burned out.

[0049] In addition, when the power source E0 is incorrectly connected (not shown in the figure), the positive and negative poles of the power source E0 are connected to the negative input end and the positive input end respectively, as shown in Figure 1 When the main contact system C is closed, the driving circuit 1 will be conducting, and the actuator 2 will be powered to act to drive the main contact system C to open, which can realize the protection of the circuit breaker after closing under the condition of incorrect connection of the power source E0.

[0050] Preferably, the driving circuit 1 and the actuator 2 are connected in series between the negative output end and the positive output end, and the current conduction direction of the unidirectional conduction element is from the negative output end of the circuit breaker to the positive output end of the circuit breaker. Connecting the driving circuit 1 and the actuator 2 on the output side of the main contact system C can avoid long-term electrification and realize the protection of the load battery L0 before closing of the circuit breaker.

[0051] Preferably, the actuator 2 is driven and engaged with the operating mechanism to prevent the main contact system C from closing. In one embodiment, the operating mechanism includes a snap-fit ​​lock member and a tripping member; the actuator 2 actuates to rotate the tripping member and release its snap fit with the lock member, causing the operating mechanism to disengage and prevent the main contact system C from closing. Furthermore, the operating mechanism also includes a handle, a transmission link, and a rotating plate. The handle and rotating plate are pivotally mounted and can be pivotally mounted on the circuit breaker housing. The handle is connected to the lock member via a transmission link. The lock member and tripping member are pivotally mounted on the rotating plate and snap-fit ​​together to form a connecting rod structure. The active contact C0 is connected to the rotating plate. Rotation of the handle drives the rotating plate through the lock member, driving the active contact C0 to contact and separate from the main static contact C1, thereby closing and opening the circuit breaker. Obviously, the operating mechanism can also adopt other four- or five-link structures.

[0052] Preferably, the circuit breaker CB of the present invention further includes an overload protection mechanism 4 and a short-circuit protection mechanism 3 respectively driven and cooperated with the operating mechanism. When a short circuit or overload fault occurs in the circuit breaker CB, the overload protection mechanism 4 or the short-circuit protection mechanism 3 drives the tripping member to rotate and release the hasp cooperation with the locking member, thereby opening or tripping the circuit breaker through the operating mechanism.

[0053] Preferably, the circuit breaker CB of the present invention further comprises an arc extinguishing chamber 5 cooperating with the main contact system C, for extinguishing the arc generated when the active contact C0 and the main static contact C1 are closed / opened.

[0054] Preferably, the actuator 2 can be implemented in various forms, specifically:

[0055] Form 1: The actuator 2 is an electromagnetic actuator. When the bipolar input terminals of the load battery L0 are incorrectly wired, the electromagnetic actuator drives the tripping member to rotate and release the latching engagement with the locking member, causing the operating mechanism to fail and the circuit breaker CB to fail to close. Preferably, the electromagnetic actuator includes an electromagnetic coil. Preferably, the electromagnetic actuator is a shunt release.

[0056] Preferably, Figure 5 As shown, the circuit breaker of the present invention also includes a linkage switch K that is linked to the active contact C0 and maintains a normally open state. The linkage switch K is connected in series between the drive circuit 1 and the actuator 2. When the operating mechanism drives the active contact C0 and the main static contact C1 to close, the operating mechanism drives the linkage switch K to close before the main contact system, so that in the event of a misconnection, the actuator 2 is electrically activated first. Furthermore, the contact opening distance of the linkage switch K can be set to be smaller than the contact opening distance of the main contact system C, so that the linkage switch K can be closed before the main contact system C. Of course, other methods can also be used to make the linkage switch K close before the main contact C, which will not be described in detail here. The linkage switch can be a micro switch.

[0057] Form two: the actuator 2 is an electric operating device, which includes a motor connected in series with the drive circuit 1 and a transmission gear set connected with the motor drive, and the transmission gear set is driven in cooperation with the operating mechanism; when the two-pole connection terminals of the load battery L0 are connected incorrectly, the electric operating device is powered, the motor drives the jump buckle member to rotate through the transmission gear set and releases the snap-fit with the lock buckle member, the operating mechanism is tripped invalid, and the circuit breaker CB cannot be closed. Further, the electric operating device further includes a linkage element, and the transmission gear set is connected with the jump buckle member drive through the linkage element.

[0058] Preferably, when the two-pole connection terminals of the load battery L0 are connected correctly, the electric operating device is driven in cooperation with the operating mechanism, so that the circuit breaker is automatically closed / opened, that is, the electric operating device can also be used as a structure for remotely controlling the closing / opening of the circuit breaker CB.

[0059] Preferably, the actuator 2 can also not use the trigger operating mechanism tripping mode, for example, uses a limit handle member or a rotating plate to rotate to prevent the main contact system C from closing. The handle member or rotating plate is provided with a limiting groove, when the connection is incorrect, the electric operating device is powered, the motor drives the linkage element to insert into the limiting groove through the transmission gear set, so that the handle member or rotating plate cannot be rotated to close. Of course, this scheme is not convenient for the circuit breaker that has already been closed.

[0060] Preferably, as shown in Figure 6 , it is another embodiment of the circuit breaker of the present application.

[0061] As shown in Figure 6 , an insertion type circuit breaker includes an operating button, an operating mechanism, an overload protection mechanism 4, an arc extinguishing chamber 5, and a short-circuit protection mechanism 3, the overload protection mechanism 4 and the operating mechanism are arranged side by side, the arc extinguishing chamber 5 and the short-circuit protection mechanism 3 are arranged side by side and below the overload protection mechanism 4 and the operating mechanism, the circuit breaking pole output end and the through pole output end are arranged side by side below the arc extinguishing chamber 5 and the short-circuit protection mechanism 3 and at the lower end of the circuit breaker housing; the operating button is connected with the operating mechanism drive through a first connecting rod, and the circuit breaking pole input end, the through pole input end, and the operating button are all arranged on the upper end of the circuit breaker housing.

[0062] Preferably, as shown in Figure 6 , the actuator 2 is a split excitation tripper, and the split excitation tripper and the short-circuit protection mechanism 3 are an integrated module and are driven in cooperation with the jump buckle member of the operating mechanism, which is prior art in the field and will not be described in detail.

[0063] Preferably, as shown in Figure 6As shown, the operating mechanism comprises a locking piece, a jumping piece and a rotating plate, the locking piece and the jumping piece are respectively pivotally arranged on the rotating plate, the rotating plate is connected with the driving of the driving contact C0, and the operating button is connected with the driving of the locking piece through the first connecting rod.

[0064] It should be pointed out that the circuit breaker of the present application can be a plug-in circuit breaker, a molded case circuit breaker or other small circuit breaker with an operating mechanism. The handle member of the molded case circuit breaker extends out of the shell, and the handle member drives the circuit breaker to open and close.

[0065] The above is a further detailed description of the present application in combination with specific preferred embodiments, and the specific implementation of the present application should not be limited to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, a number of simple deductions or substitutions can be made without departing from the concept of the present application, and all of them should be considered as falling within the protection scope of the present application.

Claims

1. A circuit breaker comprising a main contact system (C) and an operating mechanism for driving the main contact system (C) to close and open, a positive circuit having a positive input terminal and a positive output terminal, and a negative circuit having a negative input terminal and a negative output terminal, the main contact system (C) being connected between the positive input terminal and the positive output terminal and / or between the negative input terminal and the negative output terminal, characterized in that: The circuit breaker further comprises a drive circuit (1) connected sequentially between the positive circuit and the negative circuit, an actuator (2), and a linkage switch K linked to the active contact (C0) and maintained in a normally open state. The drive circuit (1) comprises a unidirectional conductive element, the current conduction direction of the unidirectional conductive element is from the negative circuit of the circuit breaker to the positive circuit of the circuit breaker. When the drive circuit (1) is turned on, the actuator (2) is energized and actuated to cooperate with the operating mechanism to prevent the main contact system (C) from closing. The linkage switch K is connected in series with the actuator (2). When the operating mechanism drives the active contact (C0) and the main static contact (C1) to close, the linkage switch K is driven to close before the main contact system (C), and the actuator (2) is energized and actuated.

2. The circuit breaker according to claim 1, wherein: The one-way conducting element is a diode, the anode of the diode is connected to the negative circuit, and the cathode of the diode is connected to the positive circuit.

3. The circuit breaker according to claim 1, wherein: The operating mechanism comprises a locking member and a jumper that are snap-fitted; the actuator (2) drives the jumper to rotate to release the snap-fit ​​with the locking member, causing the operating mechanism to trip to prevent the main contact system (C) from closing.

4. The circuit breaker according to claim 3, wherein: The operating mechanism also includes a handle, a transmission connecting rod and a rotating plate. The handle and the rotating plate are respectively pivotally arranged. The lock and the jumper are respectively pivotally arranged on the rotating plate and snap-fitted. The handle is connected to the lock through the transmission connecting rod, and the rotating plate is connected to the active contact (C0).

5. The circuit breaker according to claim 1, wherein: The drive circuit (1) and the actuator (2) are connected between the negative output terminal and the positive output terminal, and the current conduction direction of the unidirectional conductive element is from the negative output terminal of the circuit breaker to the positive output terminal of the circuit breaker.

6. The circuit breaker according to any one of claims 1 to 5, characterized in that: The actuator (2) is an electromagnetic actuator.

7. The circuit breaker according to claim 6, characterized in that: The electromagnetic actuating mechanism is a shunt release.

8. The circuit breaker according to any one of claims 1 to 5, characterized in that: The actuator (2) is an electric operating device, which includes an electric motor connected in series with the drive circuit (1) and a transmission gear set connected to the motor drive. The electric operating device prevents the main contact system (C) from closing through the transmission gear set.

9. The circuit breaker according to claim 8, characterized in that: The electric operating device cooperates with the operating mechanism to automatically close / open the circuit breaker.

10. The circuit breaker according to claim 1, wherein: The circuit breaker further comprises an overload protection mechanism (4) and a short circuit protection mechanism (3) respectively coordinated with the operating mechanism.

11. The circuit breaker according to claim 1, wherein: It includes a circuit breaker circuit and a straight-through pole circuit; the circuit breaker circuit includes a circuit breaker input terminal, a circuit breaker output terminal, and a main contact system (C) connected in series between the circuit breaker input terminal and the circuit breaker output terminal; the straight-through pole circuit includes a straight-through pole input terminal and a straight-through pole output terminal connected by a conductor; The circuit-breaking pole circuit is a negative pole circuit, the straight-through pole circuit is a positive pole circuit, the circuit-breaking pole input terminal and the circuit-breaking pole output terminal are respectively a negative pole input terminal and a negative pole output terminal, and the straight-through pole input terminal and the straight-through pole output terminal are respectively a positive pole input terminal and a positive pole output terminal; or, the circuit-breaking pole circuit is a positive pole circuit, the straight-through pole circuit is a negative pole circuit, the circuit-breaking pole input terminal and the circuit-breaking pole output terminal are respectively a positive pole input terminal and a positive pole output terminal, and the straight-through pole input terminal and the straight-through pole output terminal are respectively a negative pole input terminal and a negative pole output terminal.

12. A power protection system, characterized in that: The circuit breaker comprises the circuit breaker according to any one of claims 1 to 5, 7, and 9 to 11, wherein the circuit breaker is connected between a load battery L0 and a power source E0, and the two polar input terminals of the load battery L0 are respectively connected to the positive output terminal and the negative output terminal of the circuit breaker; when the two polar input terminals of the load battery L0 are correctly connected, the drive circuit (1) of the circuit breaker is not turned on; when the two polar input terminals of the load battery L0 are incorrectly connected, the drive circuit (1) of the circuit breaker is turned on, and the actuator (2) of the circuit breaker is energized to prevent the main contact system (C) of the circuit breaker from closing.

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