At Jiangsu Changyun Intelligent Technology Co., Ltd., quality is built into every stage of manufacturing. From raw material inspection to final factory testing, every Ring Main Unit (RMU), Vacuum Circuit Breaker (VCB), SF₆ Load Break Switch, and Medium Voltage Switchgear is produced under a strict quality management system to ensure reliable performance, long service life, and compliance with international standards.
Our products are widely used in power utilities, substations, industrial plants, renewable energy projects, commercial buildings, and infrastructure projects worldwide.
We believe that product quality begins long before production. Every manufacturing process is carefully monitored to ensure consistent performance and customer satisfaction.
Our quality management covers:
- Incoming Raw Material Inspection
- CNC Precision Machining Inspection
- Component Quality Verification
- Assembly Process Inspection
- Electrical Performance Testing
- Mechanical Operation Testing
- Final Factory Inspection
- Packing & Shipping Inspection
Every product is inspected before shipment to ensure safety, reliability, and long-term operation in demanding environments.
Every product follows a standardized manufacturing process to guarantee stable quality.
- Raw Material Inspection
- Precision CNC Machining
- Component Assembly
- Electrical Testing
- Mechanical Function Testing
- Final Quality Inspection
- Packing & Delivery
Changyun products are designed and manufactured in accordance with international and national standards to meet the requirements of global power distribution projects.
IEC 62271 Series
High-voltage switchgear and controlgear standards ensuring operational safety, insulation performance, and long-term reliability.
IEC 60265
High-voltage switches for rated voltages above 1 kV.
IEC 62271-100
High-voltage AC circuit breakers.
IEC 62271-103
High-voltage load break switches.
GB/T 1984 — AC High Voltage Circuit Breakers
GB 1985 — Disconnectors and Earthing Switches
GB 3804 — High Voltage Load Break Switches
GB 3906 — Metal Enclosed Switchgear
GB 4208 — IP Protection Ratings
GB/T 11022 — Common Specifications for High Voltage Switchgear
GB/T 16927.1 — High Voltage Testing Techniques
GB/T 17467 — Prefabricated Substations
DL/T 403
DL/T 404
DL/T 486
DL/T 593
All products undergo routine factory testing to ensure full compliance with applicable standards before shipment.
Every product is fully tested before leaving our factory.
Routine tests include:
- Mechanical Operation Test
- Contact Resistance Test
- Power Frequency Withstand Voltage Test
- Insulation Resistance Test
- Partial Discharge Test
- Interlocking Function Test
- Current Transformer Verification
- Protection Circuit Inspection
- Gas Leakage Test (SF₆ RMU)
- Vacuum Degree Test (VCB)
- Appearance & Dimension Inspection
Test reports are available upon customer request.
To support project approval and international bidding, Changyun provides complete technical documentation.
Available documents include:
- Factory Test Reports
- Type Test Reports (Available Models)
- Product Drawings
- Wiring Diagrams
- Operation Manuals
- Installation Instructions
- Material Certificates
- Quality Certificates
Third-party inspections by SGS, BV, TÜV, or customer-designated organizations are also supported.
Our factory is equipped with advanced testing equipment to ensure every product meets international performance standards.
Testing capabilities include:
- High Voltage Test Bench
- Partial Discharge Testing System
- Mechanical Endurance Tester
- Contact Resistance Tester
- Power Frequency Withstand Voltage Tester
- SF₆ Gas Leakage Detector
- Vacuum Degree Tester
- Insulation Resistance Tester
Continuous investment in testing equipment helps us maintain consistent product quality.
Our management systems have been independently certified to internationally recognized standards.
Ensures standardized production processes, continuous quality improvement, and consistent product performance.
Promotes a safe working environment while protecting employees and production quality.
Demonstrates our commitment to environmentally responsible manufacturing and sustainable development.
- 17+ Years Manufacturing Experience
- Professional Medium Voltage Switchgear Manufacturer
- 100% Routine Factory Testing
- IEC 62271 Compliant Products
- ISO 9001 Certified Manufacturing
- OEM & ODM Services Available
- Fast Delivery
- Experienced Engineering Team
- Complete Technical Documentation
- Export Experience in Global Power Distribution Projects
| Item | Information |
|---|---|
| Manufacturing Experience | 17+ Years |
| Product Categories | RMU, VCB, Load Break Switch, Medium Voltage Switchgear |
| Quality System | ISO 9001 Certified |
| Factory Testing | 100% Routine Tested Before Shipment |
| Standards | IEC 62271, GB, DL/T |
| OEM / ODM | Available |
| Technical Documents | Available Upon Request |
| Third-Party Inspection | SGS / BV / TÜV Supported |
| Technical Support | Before & After Sales |
| Export Markets | Asia, Middle East, Africa, South America |
Yes. Every product undergoes routine factory testing before shipment, and detailed test reports can be provided upon request.
Yes. Type Test Reports are available for selected product models and can be supplied for project approval or tender documentation.
Our products comply with IEC 62271 series, IEC 62271-100, IEC 62271-103, GB, and DL/T standards, depending on the product type.
Yes. We welcome inspections by SGS, BV, TÜV, or any customer-designated inspection organization before shipment.
Yes. We have experience supplying medium-voltage switchgear solutions that comply with Indonesia PLN technical specifications and project requirements.
Yes. We provide OEM and ODM manufacturing services, including customized panel layouts, branding, electrical configurations, and technical documentation.
Quality is controlled throughout the manufacturing process, from raw material inspection to final electrical and mechanical testing. Every product is tested before delivery.
We provide product catalogs, user manuals, GA drawings, wiring diagrams, factory test reports, and other project documents upon request.
Looking for a reliable manufacturer of Ring Main Units (RMUs), Vacuum Circuit Breakers (VCBs), SF₆ Load Break Switches, or Medium Voltage Switchgear?
Our engineering team is ready to provide:
- Product Catalogs
- Factory Test Reports
- Type Test Reports
- Technical Drawings
- OEM & ODM Solutions
- Project Consultation
Contact us today to discuss your project requirements and receive professional technical support.
