QCL-12 / Medium-voltage distribution
12 kV SF6 ring main unit
A compact, modular SF6-insulated RMU for utility distribution, secondary substations and industrial networks. Select the C, F, V and supporting functions around your project scheme.
Your SLD, system ratings and installation requirements define the final configuration.
Designed around the application
From network requirements to a clear equipment specification
Discuss feeder functions, protection, cable interfaces and installation conditions together, before fixing the supplied arrangement.
Secondary distribution
For ring-network feeders and secondary substations, with functional units selected to suit the distribution scheme.
Industrial & building projects
Match the equipment to load requirements, protection coordination, the installation environment and project specification.
EPC & panel integration
Coordinate the single-line diagram, general arrangement, auxiliary supply and technical documents before supply.
Technical reference
Key specifications, with their scope made clear
These values describe the documented product-family range. Confirm the selected functional unit and project requirements before ordering.
| Item | Product-family value |
|---|---|
| Rated voltage | 12 kV |
| Rated frequency | 50 Hz |
| Insulation system | SF6 gas insulation |
| C load-switch rated current | 630 A |
| F fuse-combination circuit | 125 A fuse circuit; fuse selection is project-specific |
| V vacuum-switch rated current | 630 A |
| Power-frequency withstand voltage | 42 kV; 48 kV across the isolating distance |
| Lightning impulse withstand voltage | 75 kV; 85 kV across the isolating distance |
| Functional arrangement | C / F / V and project-configured cable, bus or metering functions |
| Dimensions and interfaces | Confirm against the selected arrangement and approved drawings |
Final supply is governed by the approved technical agreement, drawings and order documents. Product-family ratings are not a substitute for the applicable test reports.
Functional units
Build the line-up from your single-line diagram
Start with the feeder function. Confirm switching duty, protection, earthing, interlocks and interfaces for the complete arrangement.
Load-break switch
Ring-network switching function. Confirm the operating mechanism, earthing arrangement and required interfaces.
Switch-fuse combination
Transformer protection using a selected fuse arrangement. Fuse selection follows the transformer and coordination requirements.
Vacuum circuit-breaker
Feeder or transformer protection. Confirm the protection relay, instrument transformers and auxiliary supply.
Additional project functions
Discuss cable connection, bus sectionalising, voltage-transformer or metering functions as required by the scheme. Dimensions, termination positions, operating clearances and extension interfaces need the selected arrangement drawing.
Explore drawings & interfacesEngineering documents
The right document for the decision in front of you
Check the model, revision and configuration scope before using a document in a project specification.
01 / Product information
Catalogues & data sheets
Review the product-family overview and technical reference values for QCL-12.
Download QCL-12 catalogue (PDF)02 / Project coordination
Drawings & interfaces
Discuss the selected line-up, installation envelope and cable connection requirements.
Explore drawing support03 / Technical evidence
Reports & test scope
Match the named sample, model and tests to your procurement requirements.
Review available report informationNeed a document for a specific unit or project? Include that requirement in your enquiry. Catalogue pages and reference drawings are distinct from approved project documents.
Make your enquiry easier
A short question is enough to start
If you have a specification, send it with your enquiry. If you do not, tell us your country, the equipment you need and what it will supply.
- Project country and installation conditions
- Rated voltage and frequency
- SLD, feeder functions and quantity
- Load current and short-circuit requirements
- Cable details and auxiliary supply
- Required documents and delivery schedule
QCL-12 questions
Can QCL-12 be used for an 11kV network?
QCL-12 is a 12kV-class product. Suitability for a 10kV or 11kV system depends on the insulation requirements and project specification.
Which functional units are available?
C cable-switch, F switch-fuse, V circuit-breaker, PT and metering functions can be arranged to match the approved SLD.
What does 630A / 25kA mean?
630A describes the normal-current rating; 25kA describes short-circuit withstand duty. The required duration and ratings must be checked for the selected functional unit.
What information is needed for a quotation?
Start with your country, equipment type and approximate quantity if known. For a firm technical offer we will confirm the voltage, current, fault level, functional units, cable interfaces, protection and delivery requirements.
Which type-test documents can I review?
Model-specific report references are 2026XHT06258, 2026XHT06259 and 2026XHT06260 for the stated C, F and V units. Each report applies only to its tested model and scope.
Can I request GA drawings and FAT?
Project-specific GA drawings follow configuration clarification. The inspection and FAT scope, including applicable mechanical, interlocking and electrical checks, is agreed for the order.
Discuss your QCL-12 requirement
Bring the project. Let us help define the equipment.
Share your requirements with Qiangchi. We will help you clarify the configuration and the documents needed for quotation.
Prefer email? sales@zgqci.com