12KV ZN63(VS1)-12 Indoor Vacuum Circuit Breaker Technical Description The 12KV ZN63(VS1)-12 is a high-performance indoor vacuum circuit breaker (VCB) designed for medium-voltage power distribution systems. It is widely used in 12kV applications, providing reliable protection and control for electrical networks in industrial plants, commercial buildings, and utility substations. Key Features 1. Vacuum Interruption Technology - Utilizes a vacuum interrupter as the arc-quenching medium, ensuring minimal maintenance, high dielectric strength, and long service life. - The vacuum chamber provides superior arc extinction, reducing contact erosion and enhancing breaking capacity. 2. Rated Parameters - Rated Voltage: 12kV - Rated Current: 630A, 1250A, or 1600A (depending on model) - Short-Circuit Breaking Current: Up to 31.5kA (IEC standard) - Mechanical Life: 10,000–20,000 operations - Electrical Life: 5,000–10,000 operations at rated current 3. Compact and Robust Design - Fixed or withdrawable configuration for easy installation and maintenance. - Spring-operated mechanism ensures fast and reliable switching. - Anti-vibration and corrosion-resistant construction suitable for harsh environments. 4. Safety and Protection - IP3X protection grade prevents accidental contact with live parts. - Integrated overcurrent, short-circuit, and earth fault protection (when used with relays). - Manual and motorized operation options for remote control. 5. Standards Compliance - Meets IEC 62271-100, GB/T 1984, and other international standards. - Suitable for ring main units (RMUs), switchgear panels, and transformer protection. Applications - Power distribution networks (secondary substations, industrial grids). - Motor protection in heavy industries. - Renewable energy systems (solar/wind farms). Advantages - Low maintenance compared to SF6 or oil-based breakers. - Environmentally friendly (no greenhouse gas emissions). - High breaking capacity with minimal wear. This ZN63(VS1)-12 VCB ensures safe, efficient, and durable operation in medium-voltage systems, making it a preferred choice for modern electrical infrastructure.