SLVA (Standardized Low-Voltage Assembly) switchgear is a low-voltage switchgear assembly designed according to standardized requirements, specifically suitable for 0.4kV (400V/415V) voltage systems. The product model uses the capital letters of “Standardized Low-Voltage Assemblies,” abbreviated as SLVA. SLVA low-voltage switchgear standardizes and unifies the structural scheme, primary interfaces, secondary interfaces, civil engineering interfaces, and parameters of major components — enabling true interoperability and interchangeability between different manufacturers’ products without custom engineering or modification.
Developed in response to the power distribution industry’s need for standardization and rationalization, SLVA switchgear provides a coordinated set of standardized cabinet dimensions, busbar ratings, functional unit configurations, and interface definitions. This standardization approach reduces design lead time, simplifies procurement, eliminates the need for custom manufacturing, and ensures consistent quality across multi-source procurement scenarios for large distribution network operators.
The enclosure features a modular frame construction with standardized panel widths supporting fixed and plug-in unit configurations, with front-access cabling and maintenance.
Technical Specifications
| Item | Specification |
|---|---|
| Rated Working Voltage (Ue) | 400V / 415V |
| Rated Insulation Voltage (Ui) | 660V |
| Rated Frequency | 50Hz / 60Hz |
| Rated Current (Main Busbar) | 630A / 1000A / 1600A / 2000A / 2500A / 3150A / 4000A |
| Rated Short-time Withstand Current (Icw) | 35kA / 50kA / 65kA |
| Rated Peak Withstand Current (Ipk) | 73kA / 105kA / 143kA |
| Degree of Protection | IP30 / IP40 / IP43 (optional) |
| Installation Type | Indoor, floor-standing |
| Unit Types | Fixed / Plug-in (standardized module sizes) |
| Module Size (Height) | 160mm / 200mm / 240mm per unit (E = 25mm modular increment) |
| Busbar Material | High-conductivity T2 electrolytic copper |
| Enclosure Material | Cold-rolled steel with epoxy powder coating |
| Enclosure Color | RAL 7035 (standard light gray) |
| Cable Entry | Bottom entry / Top entry (by configuration) |
| Standards | GB/T 7251, IEC 61439 |
Key Features
- Full Standardization Architecture: SLVA defines standard structural dimensions, primary circuit schemes, secondary wiring interfaces, civil engineering foundation layouts, and major component specifications — enabling direct interchangeability between competing manufacturers’ products without re-engineering or site modification, a significant advantage for utility and large industrial procurement programs
- Interoperable Functional Units: Standardized module sizes (based on 25mm E-module increments) ensure that functional units from different suppliers fit the same cabinet frame without adaptation — incoming units, outgoing feeders, metering units, and capacitor compensation units can be freely mixed within a single switchboard assembly
- Reduced Engineering Lead Time: Standardized design eliminates the need for project-specific engineering for each switchboard — selection from standard scheme tables and interface definitions reduces design lead time by 50–70% compared to fully customized switchgear, enabling faster project delivery
- Simplified Civil Engineering: Standardized foundation dimensions, cable entry locations, and busbar connection interfaces simplify substation civil engineering design — foundation drawings and cable trench layouts can be prepared from standard templates without waiting for switchgear final design
- Flexible Unit Configuration: Supports both fixed and plug-in unit configurations within the same cabinet frame — fixed units for simple feeder applications at lower cost, plug-in units for applications requiring quick replacement without tools
- Cost-Effective Manufacturing: Standardized production processes, common parts inventory, and repeated manufacturing cycles for standard schemes reduce unit production costs by enabling batch manufacturing rather than one-off bespoke fabrication — cost savings passed on to the end user
- Front-Access Maintenance: All primary and secondary terminations are accessible from the front of the cabinet — allowing wall-mounted or back-to-back installation configurations without requiring rear access space, reducing the floor area required for the switchboard installation
- Proven Utility Platform: Developed in collaboration with major Chinese power distribution utilities to meet their specific requirements for standardization in urban and rural distribution network construction programs — widely adopted in State Grid Corporation of China and China Southern Power Grid projects
Applications
- Urban and rural distribution network standardized construction
- Utility substation low voltage distribution — standardized procurement programs
- Commercial and residential building main switchboards
- Industrial facility power distribution
- Infrastructure projects — standardized power distribution in public buildings
- Renovation and upgrade of existing substations requiring standardized replacement switchgear