QCHB-12 Environmentally Friendly Gas-Insulated Ring Main Unit
The QCHB series is a sealed eco-friendly gas-insulated ring main unit for 12/24 kV secondary distribution, using nitrogen (N₂) or dry air as the insulating medium.
Typical Technical Data
| Rated voltage | 12/24 kV |
|---|---|
| Rated frequency | 50/60 Hz |
| Rated current | 630/1250 A |
| Rated short-time withstand current | 20/25 kA (4 s) |
| Rated peak withstand current | 50/63 kA |
| Power-frequency withstand voltage | 42 kV / 1 min |
| Lightning impulse withstand voltage | 75 kV |
| Sealed gas tank protection | IP67 |
IP67 applies to the sealed gas tank only, not automatically to the complete cabinet. Final ratings and enclosure protection are confirmed by the approved technical agreement.
Functional Units
- C unit: cable switch / ring-main feeder
- V unit: vacuum circuit-breaker feeder
- D unit: project-configured connection
- PT unit: voltage measurement and auxiliary supply
- M unit: project metering
Technical Structure Reference
Applications
- Urban and industrial secondary distribution
- Prefabricated transformer substations
- Commercial and infrastructure power systems
- Solar, wind and distributed-energy projects
Download
Download QCHB-12 Environmental RMU Catalogue (PDF)
Technical Confirmation
Final unit combination, ratings, protection, control voltage, cable termination, dimensions and standards follow the approved SLD, technical agreement and drawings.
Ready for configuration review? Submit the SLD, ratings, quantity and destination through the Request a Quote page.
FAQ
What insulating medium is used?
QCHB uses an environmentally oriented gas-insulation approach based on nitrogen or dry air, subject to the confirmed project configuration.
Which voltage systems can be evaluated?
12kV and 24kV-class project requirements can be evaluated against the selected product configuration and insulation level.
Which functional units are available?
Cable switch, circuit-breaker, direct connection, metering and PT arrangements can be configured according to the approved SLD.
What rated current is available?
630A and 1250A project configurations are available, subject to the selected functional unit and final technical confirmation.
Are dimensions fixed?
Dimensions depend on the functional unit and project arrangement. Final values are issued in the approved GA drawing.
What site conditions are required?
Ambient temperature, altitude, humidity, pollution level, seismic requirements and installation conditions must be confirmed for each project.
What information is needed for quotation?
Send the SLD, voltage, current, fault level, quantity, cable details, protection requirements and site conditions.
Can FAT be arranged?
Yes. Routine tests, witness points and documentation can be agreed for confirmed orders.
Send Your SLD or Specification
Receive project-specific configuration, technical clarification and quotation support.
Verified model evidence
QCHB-12 Model-Specific Test Reports
- DG21120151 — QCHB (STQCHB)-12(C)/630-25
- DG21120150 — QCHB (STQCHB)-12(V)/630-25
The listed report applies only to the stated model and scope. Full interiors remain controlled.