0102030405
ZN12-12/40.5 Series: Indoor High Voltage Vacuum Circuit Breaker for 12kV/40.5kV Systems
2025-07-16
The ZN12-12/40.5 Series Indoor High Voltage Vacuum Circuit Breaker is designed for 12kV and 40.5kV indoor power systems, integrating vacuum arc-extinction technology and robust structural design to deliver reliable switching and protection for medium-voltage networks.
Core Design & Insulation
Built with epoxy resin cast insulation for the vacuum interrupter and main circuit components, the breaker features a compact, enclosed structure that meets IP3X protection standards (dust-resistant). This design ensures stability in indoor enVironments with temperature ranges from -10°C to +40°C, resisting humidity and minor dust accumulation—ideal for substations, industrial switchgear, and power distribution rooms.
Performance & Arc-Extinction
- Vacuum Interruption: Uses high-purity ceramic vacuum interrupters to achieve rapid arc extinction. For 12kV models, it handles short-circuit breaking currents up to 31.5kA; 40.5kV models support up to 25kA, with breaking time ≤60ms to minimize grid disturbances.
- Long Lifespan: Electrical life exceeds 10,000 operations, while mechanical life reaches 30,000+ cycles, reducing replacement frequency and operational downtime.
- Stable Conductivity: Low contact resistance (≤150μΩ for 12kV; ≤200μΩ for 40.5kV) ensures minimal energy loss during normal operation.
Operation & Control
Equipped with a spring-operated mechanism, the breaker supports both manual and electric operation modes, offering flexibility for different installation scenarios. Optional smart monitoring modules (via RS485 interface) enable real-time tracking of contact temperature, operation counts, and energy storage status, allowing integration with power management systems for predictive maintenance.
Application Scope
Suitable for indoor medium-voltage systems including:
- Urban and industrial substations
- Power distribution in manufacturing plants, data centers, and commercial buildings
- Renewable energy grid connections (e.g., solar or wind farm step-up stations)
- Switchgear in metro and railway power supply systems
Operational Advantages
- Low Maintenance: Vacuum interrupters eliminate the need for gas refilling or oil replacement, reducing upkeep requirements.
- Safety Features: Integrates mechanical interlocks to prevent misoperation, ensuring secure switching between open/closed states during maintenance.
- Space-Efficient: Compact footprint fits standard switchgear cabinets, simplifying installation in limited indoor spaces.