NAIJI.
EVN-12 Indoor Vacuum Circuit Breaker
Indoor Vacuum Circuit Breakers

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.

Key Features

  • 12kV rated voltage, up to 5000A rated current
  • Up to 50kA short-circuit breaking capacity
  • Mechanical life: 30,000 operations
  • M2-E2-C2 performance level (GB & IEC)
  • Solid-sealed poles with ultra-low resistance vacuum chambers
  • Convection ventilation for reduced temperature rise
  • Silver-plated main conductors for lower contact resistance
  • Modular spring mechanism — maintenance-free with self-lubricating bearings
  • Oil buffer with optimized cam curve — reduced rebound

Technical Specifications

Rated Voltage12 kV
Rated CurrentUp to 5000 A
Rated Short-Circuit Breaking Current50 kA
Mechanical Life30,000 operations
Performance LevelM2-E2-C2 (GB & IEC)
InsulationEpoxy resin solid-sealed poles
CoolingConvection ventilation
Operating MechanismModular spring mechanism

Applications

Power grid networksPower generation plantsOil & gas / petrochemical facilitiesRail transit systemsUrban infrastructure projects

Standards Compliance

IEC 62271-100GB 1984
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Frequently Asked Questions

What is the rated voltage of the EVN-12 Indoor Vacuum Circuit Breaker?
The EVN-12 Indoor Vacuum Circuit Breaker has a rated voltage of 12 kV. Please refer to the technical specifications table above for complete electrical ratings.
What is the lead time for EVN-12 Indoor Vacuum Circuit Breaker?
Standard lead time for the EVN-12 Indoor Vacuum Circuit Breaker is approximately 30 days. Larger quantities or custom configurations may require additional production time. Contact our sales team for a precise delivery schedule.
Can the EVN-12 Indoor Vacuum Circuit Breaker be customized for OEM projects?
Yes, NAIJI Electric offers OEM and custom manufacturing for the EVN-12 Indoor Vacuum Circuit Breaker. We can adjust specifications, branding, and configurations to meet project-specific requirements. Minimum order quantities apply.
What standards does the EVN-12 Indoor Vacuum Circuit Breaker comply with?
The EVN-12 Indoor Vacuum Circuit Breaker is designed and tested in accordance with IEC 62271-100, GB 1984. All products undergo rigorous factory testing before shipment.

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