Developed by Zhejiang Usune Electric Co., Ltd., the Low Voltage Withdrawable Distribution Switchboard is suitable for AC 50Hz systems with rated working voltage up to 400V and rated current up to 3150A. The design combines copper busbar distribution, configurable circuit breakers, organized secondary wiring and dedicated cable spaces to support different project layouts. Usune manufactures and supplies low-voltage switchgear solutions for power plants, substations, factories, mining facilities, commercial buildings and other power distribution projects in China and overseas markets.
Different electrical loads require different feeder arrangements. The cabinet can be configured according to the power distribution diagram, allowing incoming circuits, outgoing circuits, motor feeders and reactive power compensation circuits to be arranged within the same low-voltage distribution system.
For larger distribution requirements, universal circuit breakers such as Emax, MT, 3WN, AH and ME series can be selected according to the project design. The configuration can also incorporate molded case circuit breakers, load switches and other electrical components based on the required current rating and protection scheme.
This configuration approach allows the equipment to be adapted to different power distribution architectures instead of relying on one fixed electrical arrangement.
The main busbar and branch busbars use electrolytic copper to provide a stable current-carrying path between incoming and outgoing circuits. Flame-retardant insulation and heat-shrinkable sleeves are applied to relevant busbar sections to improve insulation protection and maintain clear phase identification.
The busbar arrangement is designed according to the electrical drawing and rated current requirements. Flexible busbar connections can also be provided at the incoming connection between the bus bridge and the main circuit breaker where required by the project design.
For procurement teams, this configuration helps simplify the matching of the switchboard with upstream transformers, bus bridges and downstream feeder systems.
The cabinet frame and internal partitions are manufactured from cold-rolled steel plates. The standard plate thickness is not less than 2 mm, providing sufficient mechanical strength for normal operation, inspection and maintenance.
The cabinet structure provides dedicated areas for electrical components, cable connections and secondary control wiring. Doors, operating handles, identification plates and internal labels are arranged according to the electrical design to make circuit identification easier during commissioning and maintenance.
A PE copper grounding bus runs along the cabinet arrangement direction. Components requiring grounding can be connected to this conductor, with dedicated grounding terminals provided for connection to the external grounding network.
The secondary circuit is arranged according to the project drawings and control requirements. Control wiring uses flexible insulated copper conductors and is organized in bundles to provide a clean and maintainable internal wiring arrangement.
Control circuits generally use 1.5 mm² conductors, while AC current circuits use 2.5 mm² conductors, subject to the final engineering design. Flame-retardant terminal blocks are used, and wire numbers or circuit identification marks are provided to correspond with the electrical drawings.
For incoming cabinets, undervoltage trip protection can be incorporated into the circuit breaker protection arrangement. Indicator lights, control switches and measuring instruments can also be configured according to the function of each circuit.
The Low Voltage Withdrawable Distribution Switchboard can be configured for several common low-voltage power distribution functions. An incoming cabinet receives power from the upstream transformer or power source, while outgoing cabinets distribute electricity to downstream loads.
Motor control circuits can be arranged using large and small drawer configurations, with circuit breakers or fused rotary load switches selected according to the motor characteristics. Capacitor compensation cabinets can incorporate manual, automatic or remote reactive power compensation equipment.
This modular arrangement allows the same cabinet platform to support different electrical distribution tasks within one project.
| Item | Specification |
| Product Type | Low Voltage Withdrawable Distribution Switchboard |
| Rated Working Voltage | 0.4kV |
| Rated Frequency | 50Hz |
| Rated Current | Up to 3150A |
| Protection Degree | IP23 |
| Installation | Indoor |
| Altitude | ≤2000m |
| Pollution Level | Level 3 |
| Ambient Temperature | -10°C to +40°C |
| Daily Average Relative Humidity | ≤95% |
| Monthly Average Relative Humidity | ≤90% |
| Seismic Intensity | ≤Magnitude 8 |
| Main Busbar Material | Electrolytic Copper |
| Cabinet Material | Cold-Rolled Steel Plate |
| Standard Cabinet Color | Electric Gray, RAL7032 |
| Model | Rated voltage (V) | Rated current (A) | Rated short-circuit breaking current (KA) | Rated short-time withstand current(1s) (kA) | Rated peak withstand current (kA) | |
| GGD1 | 380 | A | 1000 | 15 | 15 | 30 |
| B | 600(630) | |||||
| C | 400 | |||||
| GGD2 | 380 | A | 1500(1600) | 30 | 30 | 63 |
| B | 1000 | |||||
| C | 600 | |||||
| GGD3 | 380 | A | 3150 | 50 | 50 | 105 |
| B | 2500 | |||||
| C | 2000 | |||||
| Product code | A | B | C | D |
| GGD06 | 600 | 600 | 450 | 556 |
| GGD06A | 600 | 800 | 450 | 756 |
| GGD08 | 800 | 600 | 650 | 556 |
| GGD08A | 800 | 800 | 650 | 756 |
| GGD10A | 1000 | 600 | 850 | 556 |
| GGD10A | 1000 | 800 | 850 | 756 |
| GGD12 | 1200 | 800 | 1050 | 756 |
The equipment is intended for indoor installation in environments without severe vibration, impact or corrosive conditions. The ambient temperature should remain between -10°C and +40°C, with the average temperature within 24 hours not exceeding +35°C.
The installation altitude is normally limited to 2000 m. At a maximum ambient temperature of +40°C, the relative humidity should not exceed 50%, while higher relative humidity may be permitted at lower temperatures according to the applicable environmental conditions.
The installation inclination should not exceed 5° from the vertical plane. If the equipment is required for special environments or operating conditions, the final configuration can be determined through technical consultation between Usune and the customer.
Electrical safety is addressed through both cabinet construction and circuit protection. Mechanical and electrical interlocking functions are incorporated according to the selected configuration to reduce operating errors.
The cabinet uses clearly identified circuit labels and component numbers, while the grounding system provides a dedicated PE copper bus for grounding connections. Cable compartments can be designed with sufficient space for cable heads and zero-sequence current transformer installation where required.
The front and rear doors are designed for stable opening and closing, while operating components are positioned to avoid interference with cabinet doors and handles.
Usune manufactures its low-voltage electrical equipment according to applicable IEC and GB requirements. Relevant standards include GB/T 14048.2, GB 7251.12 and applicable IEC requirements for low-voltage switchgear and controlgear assemblies.
The production and management system is supported by ISO 9001, ISO 14001 and ISO 45001 certifications. The product can also be supplied with CE certification and relevant test documentation according to the project requirements.
These certifications and standards provide procurement teams with a documented basis for supplier evaluation, project approval and international purchasing.
Quality control covers cabinet materials, copper busbars, electrical components, secondary wiring and finished assembly. Components are selected according to the approved design drawings and technical specifications.
Before delivery, the assembled equipment undergoes routine inspection and testing. Wiring, component identification, grounding connections, cabinet structure and electrical functions are checked against the project documentation to reduce installation and commissioning issues at the customer's site.
Usune also maintains production and inspection records to support quality verification and project traceability.
The Low Voltage Withdrawable Distribution Switchboard has been supplied for the Cas-space Rocket Launch Project, where dependable low-voltage power distribution is required for project facilities and supporting electrical systems.
For engineering projects with multiple electrical loads and different distribution circuits, the modular cabinet configuration allows incoming power, feeder circuits and auxiliary electrical functions to be organized according to the project power distribution design.
The cabinet dimensions can be determined according to the approved electrical drawings, component selection, cable entry requirements and site installation conditions. Usune can provide corresponding dimensional drawings for engineering review before production.
Usune performs inspection and routine testing before shipment. The testing process covers cabinet assembly, electrical connections, component installation, grounding, secondary wiring and other relevant functions.
Test reports and technical documentation can be provided according to the project requirements, helping customers complete incoming inspection, installation and commissioning procedures.
The standard configuration is rated at 0.4kV, with a rated current of up to 3150A. The final electrical configuration is determined according to the project load and design drawings.
Yes. Usune can customize the cabinet configuration according to electrical schematics, circuit quantity, component selection, cable entry direction, cabinet dimensions and other project requirements.
The system can accommodate different circuit breaker configurations. Universal circuit breakers such as Emax, MT, 3WN, AH and ME series can be selected according to the approved design.
Yes. Motor control configurations can be arranged using different drawer sizes and suitable circuit breakers or fused load switches according to motor capacity and protection requirements.
The main and branch busbars use electrolytic copper. Relevant busbar sections can be provided with flame-retardant insulation and heat-shrinkable protective sleeves.
Usune can provide technical specifications, electrical drawings, dimensional drawings, test reports and relevant quality documentation according to the project requirements.
The standard lead time is generally 15–20 days, depending on configuration, quantity and project requirements.
Usune has more than 14 years of experience in electrical equipment manufacturing and project-based product development. Its engineering team can work from customer drawings and electrical specifications to develop the required cabinet configuration.
With ISO 9001, ISO 14001 and ISO 45001 management systems, IEC and GB standard compliance, CE certification and routine factory testing, Usune provides low-voltage distribution equipment for both domestic and international projects.
For a project requiring a Low Voltage Withdrawable Distribution Switchboard, customers can provide the single-line diagram, rated current, number of incoming and outgoing circuits, component requirements and cabinet dimensions. Usune can then prepare the corresponding technical configuration and quotation.
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