515results about "Shutters/guards preventing contact access" patented technology

The invention discloses an electrical cabinet with a dehumidification function, and relates to the technical field of electrical cabinets, and the electrical cabinet with the dehumidification function comprises a cabinet body, a top plate is fixed at the top of the cabinet body, electrical equipment is fixed in the cabinet body, an air inlet hole is formed in the right side of the cabinet body, a suction fan is fixed at the left side of the cabinet body, and an air outlet hole is formed in the right side of the cabinet body. And an air suction pipe of the suction fan communicates with the interior of the cabinet body, a controller is fixed to the front face of the cabinet body, and a connecting cover is fixed to the right side of the cabinet body. According to the electrical cabinet with the dehumidification function, when a condensation pipe is used for a long time, an L-shaped sliding block is pushed to move, so that the L-shaped sliding block can drive a moving column to move, an extrusion rod can move in a spiral groove, a rotating sleeve can be driven to rotate, and a scraping plate is attached to the outer wall of the condensation pipe to rotate; sediments such as water scale attached to the outer wall of the condensation pipe can be scraped off through the scraping plate, the condensation effect of the condensation pipe is improved, and subsequent moisture drying is facilitated.

The present invention relates to the technical field of distribution cabinets, and discloses an anti-electric shock outdoor distribution cabinet, including a distribution cabinet, in which a power-off switch is installed. The distribution cabinet further includes: a wiring groove opened on the power-off switch, and a wiring post is arranged in the wiring groove; an extension part fixed below the power-off switch and corresponding to the wiring groove, an insulating strip is installed on the extension part, a power connection fork is rotatably installed at the top of the insulating strip through a torsion spring, and the torsion spring applies a torsional force to the power connection fork to move it away from the wiring post, and a wire is threaded through the power connection fork and extends from its end, and an insulating wrapping layer is provided at the top of the insulating strip away from the wiring post. When the power-off switch cuts off the power, the present invention can not only disconnect the wire from the wiring post, but also insulate and wrap the exposed part of the wire, avoiding the risk of electric shock to the maintenance personnel during subsequent maintenance caused by the residual current that the exposed wire may carry, and reducing potential safety hazards.

The invention discloses a low-voltage power distribution cabinet with a protection mechanism inside, and relates to the technical field of power distribution cabinets. A low-voltage power distribution cabinet internally provided with a protection mechanism comprises a power distribution cabinet body, the inner side of the power distribution cabinet body is fixedly connected with a plurality of relays, the upper side of the power distribution cabinet body is fixedly connected with a motor, the inner side of the power distribution cabinet body is provided with a protection unit, the front side of the power distribution cabinet body is provided with a cabinet door, and the protection unit comprises a fixing block. The fixing blocks are fixedly connected to the left and right inner walls of the power distribution cabinet body, and the outer sides of the fixing blocks on the left and right sides are rotatably connected with rotating rods. According to the low-voltage power distribution cabinet internally provided with the protection mechanism, by arranging the power distribution cabinet body, the relay, the fixed block, the rotating rod, the protection plates, the first toothed plate, the second toothed plate and the moving frame, the protection plates on the two sides can be conveniently controlled to rotate, the relay can be conveniently protected by the protection plates, the influence of external impact on the relay is reduced, and mistaken touch is prevented.

The invention relates to a power feed module (200) for a contact protection system for contact-safe contacting of busbars (100), wherein the power feed module (200) has a base (210) made of electrically insulating material with receptacles (220) for busbars (100) and a cover (230) made of electrically insulating material covering the base (210), characterized in that the receptacles (220) each have a contact element (222), wherein the contact elements (222) are designed to electrically contact busbars (100) inserted into the receptacles (210) at their outer circumference, wherein the contact elements (222) are each electrically connected to a terminal (232) for an electrical conductor. The invention further relates to a modular contact protection system (1).

The embodiment of the invention relates to a three-position switch and a corresponding switch cabinet. The three-position switch generally comprises an isolating contact, a grounding contact and a moving contact. The moving contact includes a first end and a second end. The first end is connected with the base, the second end is opposite to the first end along the longitudinal extension direction of the moving contact, rotates around the first end along with the moving contact, and is switched among a switching-on station in contact with the isolating contact, a grounding station in contact with the grounding contact and a switching-off station out of contact with both the isolating contact and the grounding contact. The second end is provided with a first protrusion and an arc-resistant component. The first protrusion protrudes from the main surface of the moving contact and makes contact with the isolation contact when the second end is located at the switching-on station. An arc resistant member is disposed proximate the first protrusion and configured to withstand an arc when the first protrusion is proximate the ground contact. According to the embodiment of the invention, the moving contact is correspondingly modified, so that the consistency of the contact resistance before and after the experiment can be ensured.

The invention discloses an anti-electric shock protection structure for a factory power distribution cabinet, and belongs to the technical field of electrical equipment safety protection. The normally-closed structure comprises an iron block which is fixedly installed on the surface of the hinged side, away from the power distribution cabinet body, of the cabinet door, a strong magnet which is arranged on one side of the power distribution cabinet body and is used for being magnetically attracted with the iron block to lock the cabinet door, and an overturning assembly which is arranged on the cabinet door and is connected with the strong magnet. According to the anti-electric shock protection structure for the factory power distribution cabinet, through the combined design of the normally-closed structure, the transmission structure and the L-shaped pull rod, the operation requirements of normally-closed protection of the power distribution cabinet in daily life and non-power-off unlocking during normal use can be met, the cabinet door can be unlocked during maintenance, and the L-shaped pull rod pulls a main gate to be powered off through synchronous linkage; the electric shock risk that daily irrelevant personnel open the cabinet door by mistake is avoided, the potential safety hazard of hot-line operation during maintenance is reduced, and the electrical safety protection capability of the factory power distribution cabinet in daily use and maintenance is improved.

The invention provides an anti-misoperation safety protection device for a low-voltage circuit breaker, which relates to the technical field of power distribution cabinets and comprises a low-voltage power distribution cabinet, a circuit breaker is mounted on a back plate of the low-voltage power distribution cabinet, a fixing part is mounted on the side wall of the low-voltage power distribution cabinet, a sliding rod is fixedly connected to one side of the fixing part, and a wiring bar is slidably mounted on the outer wall of the sliding rod. The low-voltage power distribution cabinet comprises a low-voltage power distribution cabinet body, a power connection wire bar and a fixing part, the power connection wire bar is installed on the side wall of the low-voltage power distribution cabinet body and elastically matched with the fixing part, and the power connection wire bar is clamped and matched with the power connection wire bar lock catch assembly through a clamping rod fixedly connected with the side wall of the low-voltage power distribution cabinet body. The clamping rod on the wiring bar is inserted into the bar lock catch assembly for insertion and fixation, so that the power-on of the circuit breaker is limited, and no danger is generated even if mistaken touch occurs; the clamping rod abuts against the lock catch to rotate, and the abutting piece abuts against the lock catch under the action of the second torsion spring, so that rotation of the lock catch is limited.

The invention provides a sealing switch cabinet isolation circuit breaker grounding device, and belongs to the technical field of grounding devices, the sealing switch cabinet isolation circuit breaker grounding device comprises a switch cabinet, and an isolation circuit breaker grounding body, an interlocking mechanism, a circuit breaker operation mechanism and a grounding operation mechanism arranged in the switch cabinet, and also comprises a buffer arc extinguishing assembly and a protection cleaning assembly; blowing and sucking actions of the air bag during switching-on and switching-off are matched with cleaning actions of the cleaning block, the air bag blows out airflow to cut off an arc path during switching-on, and the cleaning block cleans in advance to reduce the possibility of arc generation. During opening, the air bag sucks air and is lengthened to extinguish the arc, the cleaning block cleans again to prevent the arc from reignition, the arc extinguishing capability is greatly improved, and the contact ablation and equipment damage risks are reduced; the buffering function of the arc-shaped block and the air bag and the buffering function of the base plate form a multi-stage buffering mechanism, and abrasion of the contact and equipment parts is reduced; the blowing and suction treatment of the air bag and the dual cleaning effect of the cleaning block enable the contact area of the contact to be cleaner, and the contact resistance is effectively reduced.

The utility model provides a base assembly and a drawer type circuit breaker, and belongs to the technical field of electrical equipment. The base assembly comprises a drawer base and a first baffle. The drawer base comprises an upper mounting cavity and a lower mounting cavity, the upper mounting cavity and the lower mounting cavity are both used for mounting the electric connection structure, and a plurality of first air holes penetrating through the drawer base are formed in the cavity wall of the upper mounting cavity and the cavity wall of the lower mounting cavity. The first baffle is connected with the drawer base and located between the upper mounting cavity and the lower mounting cavity. The first baffle is provided with a gas exchange groove in the arrangement direction of the upper mounting cavity and the lower mounting cavity, and the gas exchange groove communicates with the upper mounting cavity and the lower mounting cavity. The drawer-type circuit breaker is provided with the plurality of first air holes, air circulation between the inside and the outside of the drawer-type circuit breaker is improved, and air circulation among the plurality of mounting cavities is improved by arranging the plurality of air exchange grooves. Therefore, heat dissipation in the drawer type circuit breaker can be improved.

The utility model discloses an anti-electric shock power distribution cabinet, which relates to the technical field of power distribution cabinets, and comprises an outer cabinet and a cable, an inner cabinet is arranged in the outer cabinet, a plurality of electronic components are fixedly installed in the inner cabinet, an auxiliary assembly for plugging and unplugging the cable is arranged in the inner cabinet, the auxiliary assembly comprises a clamping seat, and the clamping seat is fixedly connected with the outer cabinet. And the clamping seat is slidably arranged on the back of the inner cabinet through a driving unit, and the cable part is clamped on the clamping seat. According to the anti-electric-shock power distribution cabinet provided by the utility model, by using the auxiliary assembly arranged on the inner cabinet, before electronic elements in the inner cabinet need to be overhauled, a cable on the clamping seat can be controlled to slide by means of the driving unit, so that the effect of pulling out a connector of the cable and the inner cabinet is achieved; therefore, the situation that a power supply is suddenly switched on due to misoperation or equipment failure in the maintenance process, and then a worker is subjected to electric shock is avoided as much as possible.

The utility model relates to a drawer cabinet contact box, relates to contact box technical field, including cabinet shell, fixing mechanism, drawer cabinet, cabinet body and contact box, the cabinet shell is provided with switch cabin, the fixing mechanism includes locking assembly, the locking assembly includes slide rail, second cylinder and limit block, the cabinet body is in sliding connection in the switch cabin, and the limit block is in sliding connection in the switch cabin. The drawer cabinet is arranged on the cabinet body, the contact box is arranged on the cabinet body, the sliding rail is arranged on the cabinet body, a plurality of limiting holes are formed in the sliding rail, a sliding groove is formed in the cabinet shell, the second air cylinder is arranged on the cabinet shell through the sliding groove, and the limiting block is arranged on an output shaft of the second air cylinder. According to the utility model, by adopting the locking assembly in the fixing mechanism, the problem that in the process of maintaining the contact box by the drawer cabinet contact box, the drawer cabinet is in a movable switch state, so that maintenance personnel cannot conveniently maintain the contact box is solved.

The utility model discloses an insulating separator plate of electrical equipment, which relates to the field of insulating separator plates, and comprises an insulating plate body, four corners of the upper surface of the insulating plate body are provided with mounting holes, the upper part of the insulating plate body is fixedly provided with a slide rail, the center position of the slide rail is provided with a slide groove, and the slide groove is internally provided with a separator plate structure. The number of the sliding rails is three sets, each set comprises four sliding rails, each set of sliding rails are arranged in a rectangular shape, and the three sets of sliding rails are gradually reduced from outside to inside in sequence. The insulating partition plate of the electrical equipment can be used for installing or adjusting a plurality of partition plate structures, so that the partition plate structures can be conveniently used for insulating and blocking parallel or parallel electrical equipment wire harnesses and instruments after the insulating plate body performs insulating work on a certain plane, and the functionality of the insulating partition plate is improved.

The utility model discloses a kind of secondary safety protection devices for transformer substation, including safety protection device, the safety protection device includes operation panel safety protection, terminal row safety protection, air switch safety protection, presser plate safety protection and conversion handle safety protection, the operation panel safety protection includes first lock catch, operating fully-enclosed panel and first maintenance isolation lock, the operation panel safety protection is fixed operating fully-enclosed panel by first lock catch, the first maintenance isolation lock is installed on first lock catch.The utility model adopts more advanced, reliable technical means, to ensure the safety of secondary circuit in construction, technical improvement, extension and routine maintenance process, can realize the effective isolation to high-risk circuit, prevent construction personnel from mistaken touch, simultaneously should have good durability and stability, ensure that protective effect is lasting and effective.

The utility model relates to the technical field of insulating parts, and particularly discloses a plastic insulating part for power distribution switch control equipment, which comprises an insulating plate, a mounting groove is formed in the insulating plate, a plurality of movable blocks are arranged in the mounting groove in a sliding manner, and the two sides of the insulating plate are connected with the mounting blocks. A plurality of mounting boxes are arranged on one sides of the two mounting blocks in a sliding mode, fixing rods are arranged in the mounting boxes in a sliding mode, the fixing rods are connected with the movable blocks in a clamped mode, and mounting holes are formed in the surfaces of the movable blocks. When a worker loosens the fixing rod, the fixing rod and the fixing hole can be automatically clamped by the spring due to the internal elastic force of the spring, so that the electrical element is firmly fixed on the insulating plate and is stably fixed, the electrical element is prevented from moving or loosening in the subsequent use process, the normal work of other elements is not interfered, and the service life of the electrical element is prolonged. The design greatly improves the installation stability and the use reliability of the device.

This utility model relates to an electric shock protection safety isolation distribution box, belonging to the technical field of distribution boxes. The electric shock protection safety isolation distribution box includes a distribution box, an air switch installed on the inner wall of the distribution box, an isolation transformer installed on the inner wall of the distribution box, a fixing component installed at the bottom of the isolation transformer, and a branch sealing component installed on the inner wall of the distribution box. This utility model allows adjustment of the distance between two L-shaped brackets by unscrewing a screw on one side and pulling a slider. The slider's sliding distance is adjusted according to the bottom hole position of the replacement isolation transformer. The screws are then tightened to fix the L-shaped brackets to the inner wall of the distribution box. Finally, the new isolation transformer is installed in the corresponding square slot. This improves versatility and flexibility, eliminating the need for custom-made enclosures for different transformers, reducing equipment replacement or upgrade costs, adapting to different power and model requirements, and broadening the applicable scenarios.

The utility model discloses a headstock end cover for power distribution control equipment, which comprises an end cover, an articulated shaft mounting seat is arranged at one end of the inner side of the end cover, an articulated shaft is vertically and slidably mounted on the articulated shaft mounting seat in a penetrating manner, and a telescopic control mechanism is connected to one end of the articulated shaft and is used for extending and retracting the articulated shaft; a lock catch mechanism is arranged at the other end of the inner side of the end cover and is used for closing and limiting the end cover; an intelligent control panel and an emergency button are arranged on the outer side of the end cover; the emergency button is electrically connected with the intelligent control panel, and the intelligent control panel is electrically connected with the telescopic control mechanism and the lock catch mechanism. A power connector is arranged on the end cover and used for being connected with a power source to supply power to the intelligent control panel, the telescopic control mechanism and the lock catch mechanism. By arranging the emergency button, the telescopic control mechanism and the lock catch mechanism can be quickly operated by one key to be retracted through an instruction signal under an emergency condition, so that the limitation of the degree of freedom of the end cover is relieved, and the end cover can be disassembled more quickly.

The invention relates to the field of non-insulated conductors or electric conductors with the shape as the characteristic, in particular to a copper bar voltage-sharing device and a switch cabinet. The copper bar voltage-sharing device comprises a spiral spring serving as a spring shielding case, an inner hole of the spiral spring forms a shielding cavity for a copper bar to penetrate through, a gap between spring coils of the spiral spring forms a heat dissipation channel, and a limiting block which is used for being supported between the spring shielding case and the copper bar to limit the distance between the spring shielding case and the copper bar is arranged for the spring shielding case. The voltage-sharing end sockets are arranged at the two ends of the spring shielding case to shield the connection points of the copper bars and the corresponding conductors, and the voltage-sharing end sockets are provided with conductor insertion ports for insertion of the conductors to be connected with the copper bars. The overall insulation of the switch cabinet can be improved while the overall size of the switch cabinet is not increased.

The utility model discloses a busbar capable of electrically and flexibly plugging a miniature circuit breaker in a distribution box, which comprises a back plate and a combiner box body, the combiner box body is a rectangular body, a knife switch is arranged in the combiner box body, the back surface of the combiner box body is fixed on the back plate, a first connecting end connected with a main switch is led out from the top of the combiner box body, and a second connecting end connected with the main switch is led out from the top of the combiner box body. The left side and the right side of the combiner box body are respectively provided with a plurality of circuit breaker plugging positions which are arranged in sequence, each circuit breaker plugging position comprises a temporary fixing position, an anti-electric shock switch and a second connecting end connected with the wiring end of the miniature circuit breaker, the second connecting ends are located on the side face of the combiner box body, and the anti-electric shock switches are connected with knife switches in the combiner box body. According to the utility model, only the capacity of equipment in an area needs to be roughly calculated, the phase number and the current size of a switch do not need to be considered, and the design difficulty of a designer is greatly reduced; when the machine table moves, the switch can be pulled out and reused, so that waste is avoided, and the cost is saved; the switch can be plugged under the condition of uninterruptible power, an operation area is not electrified, and the safety is high; the switchboard does not need to reserve a switch, so that waste is avoided, and cost is saved; product reliability is high and installation is simple.

This application relates to the technical field of switch cabinets, and discloses a switch cabinet capable of quickly grounding, including a cabinet body. A placement groove is formed in the cabinet body, and a grounding head is arranged in the placement groove. A transfer piece is arranged on the grounding head, and the transfer piece extends in the vertical direction and is used for connecting a plug. When the plug is installed on the transfer piece, the plug can be located in the placement groove. In this application, the transfer piece is arranged in the placement groove and extends in the vertical direction, enabling the plug to be located in the placement groove, reducing the risk of the plug protruding from the placement groove and being accidentally touched, and making the switch cabinet safer when grounding.

The utility model discloses an anti-electric shock isolation device for maintenance of a single drawer device for power supply of an MNS power distribution cabinet, and the isolation device comprises an insulating baffle A, a movable sliding rail is disposed above the insulating baffle A, the movable sliding rail is connected with the insulating baffle B through a rotating shaft of the insulating baffle B, and the upper part of the insulating baffle A is connected with an insulating telescopic rod A through a 180-degree rotating shaft A; the top of the insulating telescopic rod A is connected with an insulating baffle C; and the bottom of the insulating baffle A is connected with an insulating telescopic rod B through a 180-degree rotating shaft B. According to the utility model, the isolation device is temporarily added to equipment needing to be overhauled behind the MNS switch cabinet, so that the safety of maintenance personnel is ensured.

To easily and securely prevent erroneous turn-on / erroneous turn-off of a circuit breaker even if a plurality of circuit breakers which are centrally provided in a control panel and a distribution board of an electrical facility are targeted and an external power source is turned off.SOLUTION: A circuit breaker operation limitation device 30An operating by a battery power source for a circuit breaker An is installed by registering identification information An corresponding to the circuit breaker An. A work terminal 10 allows a display part to display work process confirmation data corresponding to a work process of a control panel A, transmits an operation lock signal including identification information An of all the circuit breakers An to each circuit breaker operation limitation device 30An and once limits operation of a switch lever SW of all the circuit breakers An. The work terminal 10 transmits a lighting signal including identification information An of the circuit breaker An and an operation lock release signal to the limitation device 30An when there is work of opening / closing (turn-on / turn-off) of the circuit breaker An in a work content, lights a display light 32, informs a worker H of the circuit breaker An being a work target and releases limitation of the switch lever SW to enable operation at every work process.SELECTED DRAWING: Figure 1

The utility model discloses an interphase insulation device used for a photovoltaic grid-connected cabinet, and relates to the technical field of network cabinets, the interphase insulation device used for the photovoltaic grid-connected cabinet comprises four installation assemblies, the four installation assemblies are distributed in a rectangular array mode, and the installation assemblies are arranged in a rectangular array mode. The mounting assembly is used for mounting electrical equipment; the separation assembly is arranged in the inner cavities of the four mounting assemblies, and the separation assembly is used for separating the four mounting assemblies; the sealing assembly is arranged on the outer side of the installation assembly, the sealing assembly is used for supporting the installation assembly and the separation assembly, the sealing assembly comprises a cabinet body, electrical equipment can be installed, all phases can be electrically isolated, and therefore inter-phase short circuit can be prevented; and normal operation of the photovoltaic power generation system can be ensured.

A mobile multi-voltage power distribution system may include a trailer and a skid connected to or integrated with the trailer. The system may also include incoming power connections, the incoming power connections in mechanical connection with the skid. Further, the system may include outgoing feeder connections, the outgoing feeder connections in mechanical connection with the skid and medium voltage switchgear. The medium voltage switchgear may be coupled to the skid and in electrical connection with the incoming power connections. The medium voltage switchgear is in electrical connection with a transformer and at least one of the medium voltage switchgear is connected to one of the outgoing feeder connections. The transformer is coupled to the skid. The system further includes a low voltage switchgear, the low voltage switchgear coupled to the skid and electrically coupled to the transformer and to at least one of the outgoing feeder connections.

The utility model discloses a kind of anti-mis-touch insulation protection type distribution switch control structures, it is related to distribution switch technical field, including electric switch control main part, the front side of electric switch control main part is provided with protective cover, the protective cover is hinged with electric switch control main part by hinge, the inside of the protective cover is equipped with insulating layer, the inside of electric switch control main part is detachably connected with distribution board, the surface of distribution board is fixedly installed with anti-mis-touch switch, the both sides of electric switch control main part are provided with vent. The utility model through line board and auxiliary board cooperation, line passes through U type passageway, and utilize rebound column and clamping block rebound tight pressure, line is fixed with limit, make line in turn from U type passageway bottom and go out, reach the function of planning line installation, and cooperate auxiliary board and top and be connected with auxiliary, it is beneficial to distribution switch control structure internal neat line, increase the stability of internal structure.

The utility model relates to the technical field of low-voltage switch cabinets, in particular to a mistaken touch prevention low-voltage switch cabinet which comprises a cabinet body, a cabinet door covers the front face of the cabinet body, the cabinet door is hinged to the cabinet body through a door hinge, sliding ways are fixedly installed on the two sides of the cabinet body, and anti-disengaging plates are fixed to the upper ends and the lower ends of the sliding ways respectively. Sliding blocks are arranged on the inner sides of the sliding ways in a sliding mode, the sliding blocks are of hollow structures, and the surfaces of the two sliding blocks are jointly connected with the same protection frame. The protection frame structure is additionally arranged at the position of the switch unit of the cabinet door, when the switch unit is not used, overall anti-touch protection can be carried out on the switch unit through the protection frame, the situation that operation is changed due to the fact that the switch unit is touched by mistake can be avoided when the outside of the cabinet body is temporarily detected, the protection frame can move up and down along the sliding way, and when the cabinet door needs to be opened, the protection frame can be conveniently detached. The protection frame can move to the upper end of the sliding way, and the protection frame can move to the upper end of the sliding way to be fixed through mutual attraction of the first powerful magnet and the second powerful magnet.

The utility model relates to an extensible safety protection device which comprises a protection plate, a movable clamping plate, a fixed clamping plate, a limiting tongue plate and a warning baffle, and the upper side and the lower side of the protection plate are connected with the movable clamping plate and the fixed clamping plate to form a U-shaped clamp capable of shielding a handle of an electrical switch. The movable clamping plate can move up and down relative to the fixed clamping plate and clamp the front side of the electrical switch, the limiting tongue plate is fixed to the protection plate and located in the U-shaped clamp to limit movement of a handle of the electrical switch, and a sliding groove extending in the left-right direction is formed in the protection plate. The warning baffle is arranged in the sliding groove and can slide out of the sliding groove leftwards or rightwards so as to provide shielding and anti-error warning for the electrical switches which are arranged side by side, and a warning slogan is arranged on the front side face of the warning baffle. The anti-misoperation device has the advantages that the protection range of the anti-misoperation device can be expanded by pulling out the warning baffle, so that one anti-misoperation device does not need to be clamped on each electrical switch, the number of the anti-misoperation devices carried and installed by a maintainer is reduced, and inconvenience caused by carrying a large number of the anti-misoperation devices and mounting and dismounting is avoided.

The utility model relates to the technical field of contact boxes for switch cabinets, in particular to an internal and external double-shielding type short-size contact box, which comprises an insulation structure, a conductor structure, a high-voltage shielding structure and a low-voltage shielding structure, the insulation structure is provided with an inner cavity, and the conductor structure is connected with the insulation structure and positioned in the inner cavity. The high-voltage shielding structure is arranged in the insulation structure and connected with the conductor structure, the low-voltage shielding structure is arranged in the insulation structure, the high-voltage shielding structure is closer to the conductor structure than the low-voltage shielding structure, and the low-voltage shielding structure is used for being connected with external ground. By means of the arrangement, the inner and outer double-shielding type short-size contact box can avoid the possibility of insulation faults caused by long-time operation, and the product quality is improved.