Indoor Vacuum Circuit Breakers
Advanced indoor vacuum circuit breakers covering 12kV, 24kV, and 40.5kV voltage classes.
VN3-12E Indoor Vacuum Circuit Breaker (12kV)
The VN3-12E is a 12kV indoor vacuum circuit breaker providing reliable control and protection for 10kV power systems. Features ultra-low resistance vacuum arc chambers and a modular spring mechanism designed for minimal maintenance.
VN2-24E Indoor Vacuum Circuit Breaker (24kV)
The VN2-24E is a 24kV indoor vacuum circuit breaker providing reliable control and protection for 24kV power networks. Supports operation at altitudes up to 4,500 meters and is compatible with 12kV networks.
VN1-40.5E Indoor Vacuum Circuit Breaker (40.5kV)
The VN1-40.5E is a 40.5kV indoor vacuum circuit breaker for 36kV and 40.5kV power networks. Offers the highest voltage class in the VN series with 20,000 mechanical operations life and up to 3150A rated current.
CE-12 Indoor Vacuum Circuit Breaker
The CE-12 series indoor vacuum circuit breaker is a flagship product featuring 50,000-cycle mechanical life and up to 5000A-50kA ratings. Designed for power grids, generation, oil & gas, metallurgy, rail transit, and infrastructure sectors.
CEi-12 Intelligent Indoor Vacuum Circuit Breaker
The CEi-12 is a next-generation intelligent circuit breaker with built-in online monitoring, fault diagnosis, remote control, and data transmission capabilities. Reduces maintenance costs through predictive intelligence.
CVG-12 Indoor Vacuum Circuit Breaker
The CVG-12 is a mature and stable 12kV indoor vacuum circuit breaker jointly developed by Cooper and domestic R&D teams. Features advanced APG epoxy casting technology for reliable embedded pole insulation.
CVG-40.5 Indoor Vacuum Circuit Breaker
The CVG-40.5 extends the proven CVG platform to 40.5kV voltage class, featuring the same advanced APG epoxy encapsulation technology. Jointly developed by Cooper and domestic research teams for high-voltage indoor switching.
EVN-12 Indoor Vacuum Circuit Breaker
The EVN-12 is the latest generation 12kV indoor vacuum circuit breaker independently developed by NAIJI Electric. Features solid-sealed poles with miniaturized ultra-low resistance vacuum arc chambers cast in epoxy resin. M2-E2-C2 performance level with 30,000-cycle mechanical life.
Indoor Vacuum Circuit Breakers from NAIJI Electric
Premium indoor medium voltage vacuum circuit breakers from 12kV to 40.5kV with up to 50,000 mechanical operations life.
As a professional manufacturer with 25+ years of experience, NAIJI Electric produces high-quality products that meet international standards including IEC 62271. Our products are exported to more than 20 countries across Southeast Asia, Middle East, Africa, Latin America, and CIS regions.
All products undergo rigorous factory testing including power frequency withstand, lightning impulse withstand, and mechanical endurance tests before shipment. We offer both standard models and custom configurations to meet your project-specific requirements.
Related Technical Articles
In-depth guides from NAIJI Electric engineers to help you select and specify indoor vacuum circuit breakers.
Indoor Vacuum Circuit Breaker: Fixed vs Withdrawable VCB, 12kV–40.5kV Specs
Indoor VCB selection guide: fixed vs withdrawable design, 12kV to 40.5kV ratings, 20kA–50kA breaking capacity. Comparison table + specification checklist. 200+ models, ISO 9001 manufacturer. Get factory quote →
Indoor vs Outdoor Vacuum Circuit Breaker: IP Rating, Temperature & Mounting [2026]
Indoor vs outdoor VCB differences: IP54 vs IP41 rating, -40°C operating range, pole-mounted vs panel-mounted design — with NAIJI Electric product data & comparison table. Get factory pricing →
Vacuum Circuit Breaker vs SF6: 10-Dimension Comparison Table + Selection Guide
VCB vs SF6 circuit breaker: voltage, breaking capacity, mechanical life (30,000 vs 10,000 ops), 25-year lifecycle cost, EU F-Gas timeline. 10-dimension comparison from MV circuit breaker manufacturer →
Vacuum Interrupter Guide: Working Principle, CuCr Contact Materials & X-Ray Quality Testing [2026]
Vacuum interrupter construction, CuCr contact materials, arc physics, performance specs, X-ray testing & failure modes explained. From MV switchgear manufacturer with 25+ years experience. Free technical guide →
Frequently Asked Questions
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