QCHB-12 Environmentally Friendly Gas-Insulated Ring Main Unit
QCHB-12 is a 12 kV, 50 Hz gas-insulated ring main unit using nitrogen (N₂) or dry air as the insulating medium. The published catalogue lists a 630 A series reference; the selected functional unit and project scope are confirmed before supply.
Typical Technical Data
| Rated voltage | 12 kV |
|---|---|
| Rated frequency | 50 Hz |
| Rated current | 630 A — published series reference |
| Rated short-time withstand current | Confirm current and duration for the selected unit; catalogue nameplate example: 20 kA |
| Rated peak withstand current | Catalogue nameplate example: 50 kA; confirm the selected configuration |
| Power-frequency withstand voltage | 42 kV / 1 min |
| Lightning impulse withstand voltage | 75 kV |
| Sealed live-part protection | IP67 |
The catalogue lists IP67 for sealed live parts and IP4X for the switchgear enclosure. Final ratings, installation requirements and protection degree are confirmed for the selected unit; one component rating does not apply automatically to the complete cabinet.
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?
The published QCHB-12 catalogue covers 12 kV, 50 Hz. Requirements outside that scope need separate technical review and corresponding documentation.
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?
The published QCHB-12 series data lists 630 A. The applicable unit, ratings and project requirements must be confirmed before supply.
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.