Compact medium-voltage distribution equipment for utility networks, EPC substations, industrial power systems, solar plants, BESS and infrastructure projects.
Product Overview
QCL-12 is a metal-enclosed SF6 gas-insulated ring main unit designed for switching, protection and distribution in 12kV systems. The sealed primary circuit supports compact installation and stable service in space-limited substations. Functional units and secondary control are configured against the approved SLD and technical specification.
Core Advantages
Compact Design
Reduced equipment footprint for indoor substations and distribution rooms.
Flexible Configuration
C, F, V, PT and metering functions can be combined to match the project SLD.
Reliable Primary System
Sealed gas tank and controlled interlocking support safe, stable operation.
Project Customization
Protection, indication, metering, communication and cable interfaces are coordinated by project.
Drawing Support
GA drawings, SLD review and project submittals are available before production.
Export Support
FAT, documentation and export packing are coordinated for international delivery.
Technical Parameters
| Item | QCL-12 Series |
|---|---|
| Rated voltage | 12 kV |
| Rated frequency | 50 Hz |
| Rated current | Up to 630 A, subject to functional unit |
| Rated short-time withstand current | 20 / 25 kA, 4 s |
| Rated peak withstand current | 50 / 63 kA |
| Power-frequency withstand voltage, 1 min | 42 kV |
| Lightning impulse withstand voltage | 75 kV |
| Gas tank protection degree | IP67 |
| Final configuration | According to approved SLD and technical specification |
Functional Units & Configuration
| Unit | Function | Typical Project Use |
|---|---|---|
| C | Load-break switch cable unit | Ring incoming/outgoing feeder |
| F | Switch-fuse combination unit | Transformer protection |
| V | Vacuum circuit-breaker unit | Feeder or transformer protection with relay |
| PT | Voltage transformer unit | Voltage measurement and auxiliary supply |
| M | Metering unit | Project metering configuration |
Applications
Product Details
Front & Operating Interface
Mimic diagram, mechanical position indication and operating points arranged for clear operation.
Sealed Primary Compartment
Busbar and switching components are integrated in the gas-insulated primary enclosure.
Cable & Secondary Compartments
Cable connection, protection, control and communication interfaces are configured to the project.
GA Drawing & Dimensions
Cabinet arrangement and overall dimensions are issued with the approved project drawing. Full GA drawings are supplied without cropping after configuration confirmation.
Send Your SLD for GA Drawing โTypical SLD
Typical C, F, V, PT and metering arrangements can be combined for single-bus, ring-network and transformer-feeder schemes. The final SLD is subject to engineering review.
Manufacturing & Quality
Project, FAT & Shipment Evidence
Project records are organized by application, voltage, equipment scope, FAT, packing and shipment. Customer names are omitted where confidentiality applies.
View Project Delivery Support โDownloads
Project Documents
GA drawings, SLD and test-document scope are supplied against the confirmed configuration.
FAQ
What information is required for selection?
Rated voltage, rated current, short-circuit level, frequency, quantity, functional units, SLD, protection requirements and site conditions.
Can the configuration be customized?
Yes. Functional units, protection, metering, communication, cable interfaces and documentation are coordinated against the approved specification.
Is FAT available?
Inspection and FAT scope can be agreed as part of the project document schedule.
Have a 12kV MV Project?
Send your voltage, quantity, SLD or technical specification for engineering review.
Request QuotationSend SpecificationWhatsApp EngineerAdditional Selection FAQ
What does 630A 25kA mean?
630A is the normal-current rating and 25kA is the short-circuit withstand level. The required duration and final rating follow the network study and specification.
How is the C/V/F combination selected?
C is commonly used for cable switching, V for circuit-breaker protection and F for switch-fuse transformer protection. The final combination follows the SLD.
Can GA drawings be provided before production?
Yes. Project-specific GA drawings and interface details are prepared after technical clarification.
What happens during FAT?
The agreed FAT scope can include mechanical operation, interlocking, wiring, protection checks and routine electrical tests.
Model Meaning
QCL identifies the Qiangchi compact gas-insulated product family; 12 identifies the 12kV equipment class. Functional-unit letters and feeder combinations are confirmed from the project SLD.
For 10kV and 11kV distribution projects, the final 12kV equipment selection is confirmed against the specification and insulation requirements.
Service Conditions & Project Confirmation
| Ambient temperature | Subject to project specification and technical confirmation |
|---|---|
| Altitude | State the installation altitude in the RFQ; derating or design review may be required |
| Relative humidity | Confirm maximum and average project conditions |
| Pollution and corrosion | State pollution level, salt mist, dust and corrosive atmosphere where applicable |
| Seismic condition | Project-specific requirement to be confirmed |
| Installation | Indoor or outdoor enclosure, cable entry, room dimensions and service aisle must be specified |
Standards and Technical Compliance
The applicable IEC standards, utility requirements, project specifications, inspection plan and document list are confirmed during technical clarification. Compliance statements apply only to the final approved configuration; no unverified certificate or test claim is implied.
Engineering, Packing & Shipment
After drawing approval, Qiangchi coordinates production, inspection, routine testing and the agreed FAT scope. Finished equipment is protected for handling and export shipment according to cabinet size, destination, transport method and contractual packing requirements.
Related Technical Guides
Review the Product Finder, Product Comparison and Selection Guides.
Request Project Configuration
Send the SLD, BOQ, specification, voltage, current, fault level, quantity and destination.
Verified evidence
Model-Specific 2026 Type Test Reports
Original type-test reports have been checked for the QCL (STQCL)-12 C, F and V functional units. Public display is limited to report covers and controlled metadata; full report interiors are supplied only for technical and project review.
- 2026XHT06258: QCL (STQCL)-12-C/630-25 โ 12 kV, 630 A, 25 kA
- 2026XHT06259: QCL (STQCL)-12-F/125-31.5 โ 12 kV, 125 A, 31.5 kA
- 2026XHT06260: QCL (STQCL)-12-V/630-25 โ 12 kV, 630 A, 25 kA
Test standards: GB/T 11022-2020 and GB/T 3906-2020. Applicability is limited to the stated model and report scope.
Reviewed by Qiangchi Engineering Team ยท Updated September 13, 2026
Engineering Answers for QCL-12 Gas-Insulated Ring Main Unit
What is this product?
QCL-12 Gas-Insulated Ring Main Unit is a Qiangchi medium-voltage product configured for project-specific distribution requirements.
Which voltage levels are available?
12 kV class; applied to 10/11/12 kV distribution projects subject to the approved specification.
Where is it used?
It is used in compact utility, commercial and industrial distribution networks.
How to select the configuration?
Selection follows the system voltage, rated current, short-circuit level, functional units, protection concept, cable interface, installation conditions and approved SLD.
Which standards and tests apply?
Verified type-test evidence includes reports 2026XHT06258, 2026XHT06259 and 2026XHT06260; scope follows each original report.
What information is required for quotation?
Send the SLD, system voltage, frequency, rated current, short-circuit level, quantity, project stage, required documents and delivery requirements.