Electrical cabinet

Abstract

The present invention provides an electrical cabinet, comprising a cabinet body, wherein the cabinet body comprises a cabinet, an expansion bushing, an expansion busbar, a circuit breaker switch main shaft, a circuit breaker switch, a three-position switch main shaft, the three-position switch, a moving contact of the three-position switch, and an inlet and outlet line bushing. The expansion busbar is connected to the expansion bushing. The moving contact of the circuit breaker switch is driven by the circuit breaker switch main shaft, and the moving contact of the circuit breaker switch remains connected to the expansion busbar. The three-position switch is arranged on the three-position switch main shaft. The moving contact of the three-position switch is arranged on the three-position switch. The inlet and outlet line bushings are connected to the three-position switch through a branch busbar. The circuit breaker switch main shaft rotates to connect or disconnect the moving and static contacts of the circuit breaker switch. The three-position switch main shaft rotates to rotate the three-position switch in a linked manner, so that the moving contact of the three-position switch is connected or disconnected with the static contact of the circuit breaker switch, thereby facilitating power transmission and distribution as well as maintenance and replacement of equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical cabinets, and in particular to an electrical cabinet which facilitates the transmission and distribution of electric energy and the maintenance and replacement of equipment. Background Art

[0002] Electrical cabinets must implement five interlocking mechanisms: preventing disconnectors from opening or closing under load, preventing accidental opening and closing of circuit breakers, preventing accidental closing of the circuit breaker when the grounding switch is closed, preventing accidental closing of the grounding switch when energized, and preventing accidental entry into a live room. Existing electrical cabinets are diverse, complex in structure, and have varying interlocking designs. These mechanisms lack reliability and functionality, making them inadequate for meeting application requirements. Furthermore, improper operation can easily lead to safety incidents. Summary of the Invention

[0003] In view of this, in order to solve one of the technical problems in the related art to a certain extent, it is necessary to provide an electrical cabinet to facilitate the transmission and distribution of electric energy as well as the maintenance and replacement of equipment.

[0004] The present invention provides an electrical cabinet, comprising a cabinet body, the cabinet body comprising a cabinet, an expansion bushing, an expansion busbar, a circuit breaker switch main shaft, a circuit breaker switch, a three-position switch main shaft, a three-position switch, a moving contact of the three-position switch, and an inlet and outlet bushing, the expansion busbar being connected to the expansion bushing, the moving contact of the circuit breaker switch being driven by the circuit breaker switch main shaft, and the moving contact of the circuit breaker switch being maintained connected to the expansion busbar, the three-position switch being arranged on the three-position switch main shaft, the moving contact of the three-position switch being arranged on the three-position switch, the inlet and outlet bushings being connected to the three-position switch via a branch busbar, the circuit breaker switch main shaft being rotated to connect or disconnect the moving and static contacts of the circuit breaker switch, the three-position switch main shaft being rotated to cause the three-position switch to rotate in a linked manner, so that the moving contact of the three-position switch is connected or disconnected with the static contact of the circuit breaker switch.

[0005] Furthermore, the circuit breaker switch main shaft is connected to a transmission assembly, which includes a crank arm, a soft busbar, a pull rod, and a compression spring. The crank arm is fixed to the circuit breaker switch main shaft, and a slide groove is provided on the crank arm. The soft busbar is connected to the pull rod and the soft busbar is connected to the extended busbar. The moving contact of the circuit breaker switch is connected to the pull rod, and the pull rod is connected to a shaft rod. The pull rod is connected to a shaft rod, and the shaft rod is provided in the slide groove to slide in the slide groove. The compression spring is sleeved on the pull rod and has an end cap at the end. It is fixed to the pull rod through the shaft rod and limited pre-tightened. The crank arm rotates with the circuit breaker switch main shaft to change the position of the shaft rod in the slide groove. When the shaft rod is in the first position of the slide groove, the moving contact of the circuit breaker switch is connected to the static contact of the circuit breaker switch. When the shaft rod is in the second position of the slide groove, the moving contact of the circuit breaker switch is disconnected from the static contact of the circuit breaker switch.

[0006] Furthermore, the electrical cabinet also includes an interlocking system, which includes a compartment door panel, an earthing switch operating shaft, a baffle, an isolating switch operating shaft, and a first interlocking plate. The inlet and outlet line bushings are arranged in the compartment, and the compartment door panel is used to open and close the compartment. The first interlocking plate is connected to an interlocking rod, and the first interlocking plate is connected to a first spring. Initially, the first spring pre-tightens the first interlocking plate so that the first interlocking plate blocks the earthing switch operating shaft. A first cam is provided on the earthing switch operating shaft. The baffle is connected to a rotating shaft, and the rotating shaft is synchronized with the main shaft of the three-position switch. The shaft is fixed, and the rotating shaft is linked with the earthing switch operating shaft and the isolating switch operating shaft; operating the earthing switch operating shaft can cause the rotating shaft to rotate in linkage so that the baffle blocks or avoids the isolating switch operating shaft; operating the isolating switch operating shaft can cause the rotating shaft to rotate in linkage so that the baffle blocks or avoids the earthing switch operating shaft; the first cam presses or avoids the first interlocking plate or the interlocking rod as the earthing switch operating shaft rotates, and combined with the bayonet on the interlocking rod and the bayonet on the compartment door panel, the compartment door panel is locked in or released from the current position.

[0007] Furthermore, the interlocking system also includes a circuit breaker closing actuator, a circuit breaker opening actuator, a second interlock plate and a main shaft. The circuit breaker closing actuator and the circuit breaker opening actuator are linked with the main shaft. The main shaft is coaxially fixed with the circuit breaker switch main shaft. A second cam is provided on the main shaft. The circuit breaker closing actuator is operated to link the main shaft, so that the second cam presses the second interlock plate to block the disconnector operating shaft through the second interlock plate. The circuit breaker opening actuator is operated to link the main shaft, so that the second cam is disengaged from the second interlock plate. The second interlock plate exposes the disconnector operating shaft under the action of the second spring.

[0008] Furthermore, a third interlock plate is provided between the circuit breaker closing actuator and the disconnector operating shaft. When the disconnector operating shaft is operated and is in the open state, the third interlock plate is driven to lock the circuit breaker closing actuator and prevent it from closing. When the disconnector operating shaft is in the closed state, the third interlock plate is disengaged from the circuit breaker closing actuator so that the circuit breaker closing actuator can perform the closing operation.

[0009] Furthermore, a third cam is provided on the isolating switch operating shaft. When the isolating switch operating shaft is operated and is in the open state, the third cam causes the third interlock plate to move upward, locking the circuit breaker closing actuator and preventing the closing operation from being performed. When the isolating switch operating shaft is in the closed state, the third interlock plate moves downward due to its own gravity and is disengaged from the circuit breaker closing actuator.

[0010] It can be seen from the above scheme that the main shaft of the circuit breaker switch rotates to connect or disconnect the moving and static contacts inside the circuit breaker switch, and the main shaft of the three-position switch rotates to rotate the three-position switch in conjunction, so that the three-position switch is actuated to connect or disconnect with the static contact of the switch provided on the bracket. By operating the circuit breaker switch and the three-position switch in a specific sequence, the on-off state of the energized main circuit of the expansion bushing, the expansion busbar, the circuit breaker switch, the moving contact of the three-position switch, the three-position switch, and the inlet and outlet bushings can be realized, which facilitates the transmission and distribution of electric energy and the maintenance and replacement of equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the left perspective of the present invention.

[0012] Figure 2 It is a structural schematic diagram of the front perspective of the present invention.

[0013] Figure 3 for Figure 2 Enlarged view of point A.

[0014] Figure 4 It is a schematic diagram of the internal structure of the present invention from a left perspective.

[0015] Figure 5 Schematic diagram of the structure of the interlocking system of the present invention. DETAILED DESCRIPTION

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present invention. It can be understood that the accompanying drawings are only for reference and illustration, and are not used to limit the present invention. The connection relationships shown in the drawings are only for clear description and do not limit the connection methods.

[0017] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component, or there may be an intermediate component at the same time. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. It should also be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. The terms used in the description of the present invention in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0018] It should also be noted that in the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0019] Refer to Figures 1-4As shown, the present invention provides an electrical cabinet, including a cabinet body 100 and an interlocking system 200. The cabinet body 100 includes a cabinet 1, an expansion bushing 2, an expansion busbar 3, a circuit breaker switch main shaft 4, a circuit breaker switch 5, a three-position switch main shaft 6, a three-position switch 7, a three-position switch moving contact 8, and an inlet and outlet bushing 9. The expansion bushing 2, the expansion busbar 3, the circuit breaker switch main shaft 4, the circuit breaker switch 5, the three-position switch main shaft 6, the three-position switch 7, the three-position switch moving contact 8 are arranged in the cabinet 1, and the inlet and outlet bushing 9 is arranged in the compartment of the cabinet 1. The cabinet 1 remains in a fully enclosed state, and the cabinet 1 is filled with an environmentally friendly insulating medium to ensure that the components in the cabinet are isolated from the external environment and are not affected by the external environment, thereby improving the insulation level and reliability of the electrical cabinet.

[0020] The expansion busbar 3 is connected to the expansion bushing 2. The circuit breaker switch 5 is mounted via a bracket 51. The movable contact of the circuit breaker switch 5 is connected to the circuit breaker switch main shaft 4 and remains connected to the expansion busbar 3. The three-position switch 7 is mounted on the three-position switch main shaft 6. The three-position switch movable contact 8 is mounted on the three-position switch 7. The incoming and outgoing line bushings 9 are connected to the three-position switch 7 via a branch busbar 91. The circuit breaker switch main shaft 4 rotates to move the movable contact within the circuit breaker switch 5, thereby connecting or disconnecting the movable and static contacts within the circuit breaker switch 5. The three-position switch main shaft 6 rotates to cause the three-position switch 7 to rotate in conjunction with each other, thereby connecting or disconnecting the three-position switch movable contact 8 to the static contact 511 of the circuit breaker switch 5 mounted on the bracket 51.

[0021] The three-position switch main shaft 6 can make the three-position switch moving contact 8 in the isolation closing position ( Figure 2 A1 position), in isolation or grounding trip position ( Figure 2 A2 position), grounding closing position ( Figure 2 A3 position in the middle).

[0022] By operating the circuit breaker switch main shaft 4 and the three-position switch main shaft 6 in a specific sequence, the on-off state of the energized main circuit of the expansion sleeve 2, the expansion busbar 3, the circuit breaker switch 5, the three-position switch moving contact 8, the three-position switch 7, and the inlet and outlet bushing 9 can be realized, which is convenient for power transmission and distribution as well as maintenance and replacement of equipment.

[0023] In this embodiment, the circuit breaker switch 5 is connected with a transmission component 50, and the transmission component 50 includes a toggle arm 501, a flexible busbar 502, a pull rod 503 and a compression spring 504. The toggle arm 501 is fixed on the main shaft 4 of the circuit breaker switch. A chute 5011 is provided on the toggle arm 501. The chute 5011 is arc-shaped. The middle part of the flexible busbar 502 is connected to the pull rod 503, and the edge of the flexible busbar 502 is connected to the extended busbar 3. The pull rod 503 is connected with a shaft rod 505, and the shaft rod 505 is arranged in the chute 5011 to slide in the chute 5011. The compression spring 504 is sleeved on the pull rod 503 and has end caps at both ends. Through the shaft rod 505, it is fixed on the pull rod 503 in a limit pre-tightening manner. As the toggle arm 501 rotates along with the main shaft 4 of the circuit breaker switch, the shaft rod 505 will slide correspondingly in the chute 5011. Here, a structure of converting rotation into linear motion is adopted to promote the up-and-down linear motion of the pull rod 503, so as to drive the moving contact of the circuit breaker switch 5 arranged at the lower end of the pull rod 503, making the moving and static contacts of the circuit breaker switch 5 contact and separate, so as to realize the on-off of this section of the main charged circuit.

[0024] The distance between the first position of the chute 5011 and the main shaft 4 of the circuit breaker switch is greater than the distance between the second position of the chute 5011 and the main shaft 4 of the circuit breaker switch. When the shaft rod 505 slides from the second position to the first position of the chute 5011 (i.e., the position shown in the figure), the pull rod 503 moves downward linearly, and the moving and static contacts of the circuit breaker switch 5 contact, connecting this section of the charged circuit. The compression spring 504 is compressed, and the generated elastic force provides sufficient pressure for the contact of the moving and static contacts of the circuit breaker switch 5 to reduce the contact resistance between the moving and static contacts; when the shaft rod 505 slides from the first position to the second position of the chute 5011 (i.e., the other end of the chute 5011), the pull rod 503 moves upward linearly, and the spring returns to the pre-tightened state, and the moving and static contacts separate, disconnecting this section of the charged circuit.

[0025] Refer to Figure 5As shown, the interlocking system 200 includes a compartment door panel 10, an earthing switch operating shaft 11, a baffle 12, an isolating switch operating shaft 13, and a first interlocking plate 14. The inlet and outlet wire bushings 9 are located within the compartment, and the compartment door panel 10 is used to open and close the compartment. The first interlocking plate 14 is connected to an interlocking rod 15, which is provided with a latch 151. The first interlocking plate 14 is connected to a first spring 16, which fits over the interlocking rod 15. The compartment door panel 10 is provided with a latch corresponding to the latch 151. The earthing switch operating shaft 11 is provided with a first cam 111. The baffle 12 is connected to a rotating shaft 17, which is linked to the earthing switch operating shaft 11 and the isolating switch operating shaft 13. The rotating shaft 17 is coaxially fixed to the three-position switch main shaft 6, and the three-position switch main shaft 6 rotates together with the rotating shaft 17.

[0026] Initially, the earthing switch operating shaft 11 is in the earthing closing position, the baffle 12 blocks the isolating switch operating shaft 13, the first spring 16 is in a natural state, the first interlock plate 14 and the interlock rod 1 are lifted up, the earthing switch operating shaft 11 is blocked by the first interlock plate 14, and the earthing switch cannot be opened; the latch on the compartment door panel 10 is aligned with the latch 151 on the interlock rod 15, and under the action of the gravity of the compartment door panel 10, the elastic force of the first spring 16 is overcome, the first spring 16 is compressed, the first interlock plate 14 and the interlock rod 15 move downward synchronously, and the baffle 12 releases the obstruction of the earthing switch operating shaft 11, so that the earthing switch can be opened, the compartment door panel 10 is lifted up and taken out, and under the action of the first spring 16, the lock is restored.

[0027] When the earthing switch operating shaft 11 is operated to the closed position, the rotating shaft 17 and the baffle 12 rotate counterclockwise in conjunction, blocking the isolating switch operating shaft 13, preventing the isolating switch from opening or closing. When the earthing switch operating shaft 11 is operated to the open position, the baffle 12 moves away from the isolating switch operating shaft 13 (as shown in the figure), removing the obstruction on the isolating switch operating shaft 11, and allowing the isolating switch to open or close. In addition, the first cam 111 rotates to the position shown in the figure, squeezing the first interlock plate 14, and the interlocking rod 15 is locked in the position shown. The compartment door panel 10 is locked in the slot 151 of the interlocking rod 15, and the compartment door panel 10 cannot be lifted up to open, thus achieving interlocking between the earthing switch and the door panel to meet the interlocking requirement of preventing accidental entry into the energized compartment.

[0028] When the isolating switch operating shaft 13 is operated to place the isolating switch in the closed position, the rotating shaft 17 and the baffle 12 are linked to rotate clockwise, and the grounding switch operating shaft 11 is blocked by the baffle 12, so that the grounding switch cannot be opened or closed. Through the linkage relationship between the three, the interlocking function of the isolating switch and the grounding switch is realized to meet the interlocking requirement of preventing power from being supplied with the ground wire (or the grounding switch is in the closed position).

[0029] The interlocking system 200 also includes a circuit breaker closing actuator 18, a circuit breaker opening actuator 19, a second interlocking plate 20 and a main shaft 21. The circuit breaker closing actuator 18 and the circuit breaker opening actuator 19 are linked with the main shaft 21, and the main shaft 21 is coaxially fixed with the circuit breaker switch main shaft 4. A second cam 211 is provided on the main shaft 21. The circuit breaker closing actuator 18 is operated to link the main shaft 21, so that the second cam 211 presses the second interlock plate 20, overcomes the pulling force of the second spring 22, and the second interlock plate 20 slides downward to block the disconnector operating shaft 13 through the second interlock plate 20, so that the disconnector cannot be opened to achieve the interlocking requirement of preventing the disconnector from opening and closing under load; the circuit breaker opening actuator 19 is operated to link the main shaft 21, so that the second cam 211 is disengaged from the second interlock plate 20, and the second interlock plate 20 exposes the disconnector operating shaft 13 under the action of the second spring 22.

[0030] A third interlock plate 23 is also provided between the circuit breaker closing actuator 18 and the disconnector operating shaft 13 (the third interlock plate 23 is located on the rear side of the second interlock plate 20). When the disconnector operating shaft 13 is operated to put the disconnector in the open state, the third interlock plate 23 is driven to lock the circuit breaker closing actuator 18, and the circuit breaker cannot be closed, so as to achieve the interlocking requirements of preventing the circuit breaker from being opened or closed by mistake and preventing power from being supplied with the ground wire (or the grounding switch is closed); when the disconnector operating shaft 13 is operated to put the disconnector in the closed state, the third interlock plate 23 is disengaged from the circuit breaker closing actuator 18, so that the circuit breaker closing actuator 18 can perform the closing operation. Specifically, a third cam (not shown) is provided on the isolating switch operating shaft 13. When the isolating switch operating shaft 13 is operated and the isolating switch is in the open state, the third cam lifts the third interlock plate 23, causing the third interlock plate 23 to move upward and lock the circuit breaker closing actuator 18. When the isolating switch operating shaft 13 is in the closed state, the third interlock plate 23 moves downward due to its own gravity, releasing the lock of the circuit breaker closing actuator 18.

[0031] By using flexible design combinations, the present invention solves the complex and important interlocking relationships among the earthing switch and the door panel, the disconnector and the earthing switch, and the disconnector and the circuit breaker switch, with ingenious layout, simple structure, good protection performance, achieving the interlocking effect through a pure mechanical method, greatly reducing the probability of incorrect operation, increasing the service life of the equipment, and providing reliable personal safety protection for the operators.

[0032] In the specification and claims of this application, the words "comprise / include" and the words "have / include" and their variants are used to specify the presence of the stated features, values, steps or components, but do not exclude the presence or addition of one or more other features, values, steps, components or combinations thereof.

[0033] Some features of the present invention are described separately in different embodiments for clarity. However, these features can also be combined and described in a single embodiment. On the contrary, some features of the present invention are described only in a single embodiment for brevity. However, these features can also be described separately or in any suitable combination in different embodiments.

[0034] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An electrical cabinet, characterized in that: The cabinet comprises a cabinet, an expansion bushing, an expansion busbar, a circuit breaker switch main shaft, a circuit breaker switch, a three-position switch main shaft, a three-position switch, a three-position switch moving contact, and an inlet and outlet bushing. The expansion busbar is connected to the expansion bushing. The moving contact of the circuit breaker switch is driven by the circuit breaker switch main shaft, and the moving contact of the circuit breaker switch remains connected to the expansion busbar. The three-position switch is provided on the three-position switch main shaft. The three-position switch moving contact is provided on the three-position switch. The inlet and outlet bushings are connected to the three-position switch through a branch busbar. The circuit breaker switch main shaft rotates to connect or disconnect the moving and static contacts of the circuit breaker switch. The three-position switch main shaft rotates to rotate the three-position switch in a linked manner, so that the moving contact of the three-position switch is connected or disconnected with the static contact of the circuit breaker switch. The main shaft of the circuit breaker switch is connected to a transmission assembly, and the transmission assembly includes a crank arm, a soft busbar, a pull rod, and a compression spring, the crank arm is fixed to the main shaft of the circuit breaker switch, the crank arm is provided with a slide groove, the soft busbar is connected to the pull rod and the soft busbar is kept connected to the expansion busbar, the moving contact of the circuit breaker switch is connected to the pull rod, the pull rod is connected to a shaft rod, the shaft rod is provided in the slide groove to slide in the slide groove, the compression spring is sleeved on the pull rod and has an end cover at the end thereof, and is fixed to the pull rod through the shaft rod with limit pre-tightening, the crank arm rotates with the main shaft of the circuit breaker switch to change the position of the shaft rod in the slide groove, when the shaft rod is in the first position of the slide groove, the moving contact of the circuit breaker switch is connected with the static contact of the circuit breaker switch, and when the shaft rod is in the second position of the slide groove, the moving contact of the circuit breaker switch is disconnected from the static contact of the circuit breaker switch; The electrical cabinet also includes an interlocking system, which includes a compartment door panel, an earthing switch operating shaft, a baffle, an isolating switch operating shaft, and a first interlocking plate. The inlet and outlet line bushings are arranged in the compartment, and the compartment door panel is used to open and close the compartment. The first interlocking plate is connected to an interlocking rod, and the first interlocking plate is connected to a first spring. Initially, the first spring pre-tightens the first interlocking plate so that the first interlocking plate blocks the earthing switch operating shaft. A first cam is provided on the earthing switch operating shaft. The baffle is connected to a rotating shaft, and the rotating shaft is fixed coaxially with the main shaft of the three-position switch. The rotating shaft is linked with the earthing switch operating shaft and the isolating switch operating shaft; operating the earthing switch operating shaft can cause the rotating shaft to rotate in linkage so that the baffle blocks or avoids the isolating switch operating shaft; operating the isolating switch operating shaft can cause the rotating shaft to rotate in linkage so that the baffle blocks or avoids the earthing switch operating shaft; the first cam presses or avoids the first interlock plate or the interlock rod as the earthing switch operating shaft rotates, and combined with the bayonet on the interlock rod and the bayonet on the compartment door panel, the compartment door panel is locked in or released from the current position.

2. The electrical cabinet according to claim 1, characterized in that The interlocking system also includes a circuit breaker closing actuator, a circuit breaker opening actuator, a second interlock plate and a main shaft. The circuit breaker closing actuator and the circuit breaker opening actuator are linked to the main shaft. The main shaft is coaxially fixed with the circuit breaker switch main shaft. A second cam is provided on the main shaft. The circuit breaker closing actuator is operated to link the main shaft, so that the second cam presses the second interlock plate to block the disconnector operating shaft through the second interlock plate. The circuit breaker opening actuator is operated to link the main shaft, so that the second cam is disengaged from the second interlock plate. The second interlock plate exposes the disconnector operating shaft under the action of a second spring.

3. The electrical cabinet according to claim 2, characterized in that: A third interlock plate is also provided between the circuit breaker closing actuator and the disconnector operating shaft. When the disconnector operating shaft is operated and is in the open state, the third interlock plate is driven to lock the circuit breaker closing actuator and prevent it from closing. When the disconnector operating shaft is in the closed state, the third interlock plate is disengaged from the circuit breaker closing actuator, allowing the circuit breaker closing actuator to perform the closing operation.

4. The electrical cabinet according to claim 3, characterized in that: A third cam is provided on the isolating switch operating shaft. When the isolating switch operating shaft is operated and is in the open state, the third cam causes the third interlock plate to move upward, locking the circuit breaker closing actuator and preventing the closing operation from being performed. When the isolating switch operating shaft is in the closed state, the third interlock plate moves downward due to its own gravity and disengages from the circuit breaker closing actuator.

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