DQS-40.5 Gas-Insulated Ring Main UnitMedium-Voltage Switchboard
The DQS-40.5 is a compact, gas-insulated Ring Main Unit that offers a highly reliable and maintenance-free solution for medium-voltage power distribution. Its fully enclosed design houses all live components within a stainless steel tank, ensuring operational safety and integrity.
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Modular design with top and side expansion for flexible configurations via fully insulated solid busbars
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Offers reliable outdoor operation, 25kA/1s arc resistance
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ASTA/KEMA/IECEE certifications for global use
Core Advantages & Features
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Hermetically Sealed DesignAll high-voltage components are enclosed within a stainless steel gas compartment, ensuring insulation integrity and maintenance-free operation.
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Compact ConstructionIdeal for confined spaces such as wind turbine towers or container substations.
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Advanced Welding Technology3mm 304 stainless steel tank welded with TRUMPF five-axis laser system delivers exceptional airtightness and aesthetics.
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Helium Leak Detection AssuranceSEILER automated testing guarantees a leakage rate below 0.01% per year and a service life exceeding 30 years.
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Modular ConfigurationFlexible module arrangement supports diverse distribution schemes and system expansion.
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Fully Insulated BusbarsExtended busbars are insulated and shielded to enhance reliability and safety.
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Misoperation PreventionMechanical interlocking system provides simple and effective safety assurance.
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Durable MechanismsLoad switch lifespan reaches 5,000 operations; vacuum circuit breaker up to 10,000 operations.
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High Transfer CapabilityLoad switch-fuse combination supports transfer current of 840A.
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Intelligent Automation OptionsFactory-automated solutions enable intelligent switching and consistent product quality.
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Automated ConsistencyA fully automated assembly line ensures product consistency.
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Strong Arc ExtinguishingThe use of a gas-type load switch provides strong arc extinguishing capability.
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Technical Parameters
| Basic Parameters | |
|---|---|
| Rated voltage | 40.5 kV |
| Rated frequency | 50 Hz / 60 Hz |
| Rated current | C Unit: 630 A, F Unit: 63 A, V Unit: 630 A |
| Ratedp power frequency withstand voltage | 95 kV / 118 kV (isolation fracture) |
| Rated lightning impulse withstand voltage | 185 kV / 215 kV (isolation fracture) |
| Mechanical life | C Unit: 5000 times, F Unit: 5000 times, V Unit: 10000 times |
Rated short-circuit breaking current | F Unit: 31.5 kA, V Unit: 20 kA / 25 kA |
| Rated making current | C Unit: 50 kA, F Unit: 80 kA, V Unit: 50 kA / 63 kA |
| Rated transfer current | F Unit: 1400 A |
| Rated short-time withstand current of main circuit (4s) | C Unit, V Unit: 20 kA (4s), 25 kA (3s) |
| Rated peak withstand current of main circuit | C Unit, V Unit: 50 kA / 63 kA |
| Internal arc classification | AFLR, 25kA, 1s |
| Rated operating pressure (gauge pressure at 20℃) | 0.04 MPa |
| Minimum operating pressure (gauge pressure at 20℃) | 0.03 MPa |
| Enclosure protection class | IP41 |
| Gas tank protection class | IP67 |
| Annual gas leakage rate | ≤0.01% |
Product Documents
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Product Brochure
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DQS-40.5 SF6 Fully Insulated Ring Main Unit
2025-11-25
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