Indoor High Voltage Fixed Vacuum Circuit Breaker ZN63(VSG)-12 The ZN63(VSG)-12 is a high-performance indoor high-voltage fixed vacuum circuit breaker designed for medium-voltage power distribution systems. It is widely used in 12kV power networks for applications such as substations, industrial plants, and commercial facilities, providing reliable protection and control for electrical circuits. Key Features 1. Vacuum Interruption Technology - The breaker utilizes a vacuum interrupter as the arc-extinguishing medium, ensuring high dielectric strength, fast arc quenching, and minimal maintenance. - The vacuum chamber provides long electrical life and excellent breaking performance, capable of handling short-circuit currents up to 31.5kA (depending on the model). 2. Compact and Fixed Design - The fixed-mounted structure makes it suitable for indoor switchgear panels (such as KYN28A-12). - Its compact dimensions allow for space-efficient installation in confined electrical rooms. 3. High Mechanical and Electrical Durability - The breaker is designed for 10,000 mechanical operations and 100 full short-circuit interruptions, ensuring long service life. - Spring-operated mechanism ensures fast and reliable opening/closing operations (typically within 50-60ms). 4. Advanced Protection and Control - Compatible with microprocessor-based relays for overcurrent, short-circuit, and earth fault protection. - Supports remote operation via motorized charging and electrical closing/opening coils. 5. Safety and Environmental Benefits - No SF6 gas, making it environmentally friendly and compliant with green energy standards. - Hermetically sealed vacuum interrupters prevent external contamination and ensure maintenance-free operation. Technical Specifications - Rated Voltage: 12kV - Rated Current: 630A / 1250A / 1600A / 2000A / 2500A (customizable) - Short-Circuit Breaking Current: 20kA / 25kA / 31.5kA - Rated Frequency: 50Hz / 60Hz - Insulation Level: - Power Frequency Withstand Voltage: 42kV (1min) - Lightning Impulse Withstand Voltage: 75kV - Mechanical Life: ≥10,000 operations - Electrical Life: - Rated Current Switching: ≥10,000 operations - Short-Circuit Current Switching: ≥100 operations Applications - Power distribution networks (ring main units, substations) - Industrial power systems (factories, mining, oil & gas) - Renewable energy integration (solar/wind farms) - Commercial buildings and data centers Advantages Over Alternatives - Lower maintenance compared to oil or SF6 circuit breakers. - Higher breaking capacity and faster response than air-insulated breakers. - Noiseless operation and no hazardous emissions. Conclusion The ZN63(VSG)-12 vacuum circuit breaker is a robust, efficient, and eco-friendly solution for medium-voltage power protection. Its advanced vacuum interruption technology, high reliability, and long service life make it a preferred choice for modern electrical systems. Whether in utility grids, industrial plants, or critical infrastructure, it ensures safe and uninterrupted power distribution.