The VS1-12 Fixed Vacuum Circuit Breaker is a high-performance switching device designed for 12kV, 50Hz three-phase AC power systems. Engineered for frequent operations and reliable short-circuit current breaking (up to 31.5kA), this breaker integrates vacuum interrupter technology with a fixed installation design, ideal for industrial plants, power stations, and substations requiring robust electrical protection and control. Compliant with GB/T 1984-2014 and IEC 62271-100 standards, it offers a mechanical lifespan exceeding 30,000 operations, IP4X protection, and tolerance for extreme temperatures (-25°C to +60°C).