Indoor Vacuum Circuit Breaker
QCDL Series
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QCDL(VS1)-12 indoor vacuum circuit breaker is designed for 12 kV medium-voltage distribution systems and provides switching and protection for project-specific switchgear configurations. Fixed and withdrawable configurations can be coordinated with the switchgear design, rated current, short-circuit level, control voltage and protection scheme.
Customer Benefits
Compact Project Integration
Configuration focused on installation and system needs.
Engineering Coordination
SLD, GA and technical submittal support.
Flexible Configuration
Functional units selected for project scope.
Factory Testing
Inspection and FAT support before shipment.
Technical Parameters
| Item | Value |
|---|---|
| Model | QCDL(VS1)-12 |
| Rated Voltage | 12 kV |
| Rated Current | 1250 A |
| Frequency | 50 Hz |
| Short-Time Withstand Current | 31.5 kA / 4 s |
| Peak Withstand Current | 80 kA |
Standard selectable ratings are shown. Final rated current, short-circuit level, pole pitch and mechanism follow the approved switchgear design.
Functional Units and Configuration
CVFPTM Availability depends on the confirmed product series and SLD.
Applications
Utility Distribution
Project-specific selection and engineering review.
EPC & Substation
Project-specific selection and engineering review.
Industrial Power
Project-specific selection and engineering review.
Solar & BESS
Project-specific selection and engineering review.
Infrastructure
Project-specific selection and engineering review.
Mining
Project-specific selection and engineering review.
Product Details
The breaker combines three vacuum interrupter pole assemblies, a spring operating mechanism and the required fixed or withdrawable interface. Auxiliary contacts, secondary plug, closing and tripping coils, interlocks and accessories are selected to match the switchgear and control scheme.
Outline and Interface
Pole pitch, contact-arm size, chassis interface, control voltage and secondary wiring depend on the selected rating and switchgear design. Send the existing cabinet drawing or breaker requirement sheet for matching.
Selection Information
Please specify rated voltage, rated current, short-circuit breaking current, operating sequence, control voltage, fixed or withdrawable installation, pole pitch and required accessories.
Manufacturing and Quality
Assembly, busbar, secondary wiring, inspection, electrical testing and FAT evidence.
Engineering Documents
Technical Datasheet
Rating schedule and accessory list prepared for the selected breaker.
Outline Drawing
Dimension and interface drawing after switchgear matching.
Quality Documents
Routine-test and inspection records available for confirmed orders.
FAQ
What information is required?
Voltage, current, fault level, frequency, quantity, SLD, BOQ and technical specification.
Can Qiangchi support OEM or EPC projects?
Project-specific configuration, drawings and document support can be discussed against confirmed requirements.
Have an MV Project?
Send us your voltage, quantity, SLD or technical specification.
Request Technical ProposalSend Your SLDWhatsApp EngineerMechanism reference drawing
Verified model evidence
QCDL (VS1)-12 Model-Specific Test Report
Report: SL2024/0160-01
Model: QCDL (VS1)-12/1250-31.5
Verified scope: 12 kV; 1250 A; 31.5 kA
Test body: Shilian Test (Zhejiang) Co., Ltd.
Status: Archived model-specific report; original checked
This report applies only to the stated model and scope. Full report interiors remain controlled.
Reviewed by Qiangchi Engineering Team · Updated September 13, 2026
Engineering Answers for QCDL Indoor Vacuum Circuit Breaker
What is this product?
QCDL Indoor Vacuum Circuit Breaker is a Qiangchi medium-voltage product configured for project-specific distribution requirements.
Which voltage levels are available?
Voltage and ratings are selected from the verified QCDL datasheet for the required switchgear application.
Where is it used?
It is used in indoor medium-voltage switchgear for switching and protection duties.
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?
Applicable standards and tests follow the confirmed model, rating and controlled technical documents.
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.