The VS1-12 Handheld Vacuum Circuit Breaker is a portable, high-performance switching device designed for 12kV, 50Hz three-phase AC power systems. this breaker complies with GB/T 1984-2014 and IEC 62271-100 standards, offering IP4X protection and operation in extreme temperatures (-25°C to +60°C). Perfect for substations, mining grids, and emergency power systems requiring agile, tool-free interventions.