VS1 (ZN63A)-24 series indoor high-voltage vacuum circuit breaker is an intelligent switchgear designed for 24kV, 50Hz indoor power distribution system, integrating protection and control functions, suitable for industrial and mining enterprises, power plants and substations of high-reliability power scenarios. Using vacuum arc extinguishing technology, short circuit current breaking capacity of 25kA-31.5kA, mechanical life of more than 30,000 operations, in line with GB/T 1984-2014 and IEC 62271-100 standards.