Product Overview

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.

● Modular design with top and side expansion for flexible configurations via fully insulated solid busbars

● Offers reliable outdoor operation, 25kA/1s arc resistance

● ASTA/KEMA/IECEE certifications for global use

Core Advantages & Features

Hermetically Sealed DesignAll high-voltage components are enclosed within a stainless steel gas compartment, ensuring insulation integrity and maintenance-free operation.

01
Compact ConstructionIdeal for confined spaces such as wind turbine towers or container substations.

02
Advanced Welding Technology3mm 304 stainless steel tank welded with TRUMPF five-axis laser system delivers exceptional airtightness and aesthetics.

03
Helium Leak Detection AssuranceSEILER automated testing guarantees a leakage rate below 0.01% per year and a service life exceeding 30 years.

04
Modular ConfigurationFlexible module arrangement supports diverse distribution schemes and system expansion.

05
Fully Insulated BusbarsExtended busbars are insulated and shielded to enhance reliability and safety.

06
Misoperation PreventionMechanical interlocking system provides simple and effective safety assurance.

07
Durable MechanismsLoad switch lifespan reaches 5,000 operations; vacuum circuit breaker up to 10,000 operations.

08
High Transfer CapabilityLoad switch-fuse combination supports transfer current of 840A.

09
Intelligent Automation OptionsFactory-automated solutions enable intelligent switching and consistent product quality.

10
Automated ConsistencyA fully automated assembly line ensures product consistency.

11
Strong Arc ExtinguishingThe use of a gas-type load switch provides strong arc extinguishing capability.

12

Technical Specifications

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
Rated 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, 25 kA, 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%