The ZN63 (VS1-12) side-mounted indoor high-voltage vacuum circuit breaker is an intelligent switchgear designed for 12kV and 50Hz three-phase power systems with integrated protection and control functions, especially for harsh scenarios requiring frequent operation and high short-circuit current breaking. Using vacuum arc extinguishing technology, short circuit current breaking capacity of 31.5kA, mechanical life of more than 30,000 operations, in line with GB/T 1984-2014 and IEC 62271-100 standards. The side-mounted structure ADAPTS to the compact switchgear (such as KYN28A-12), saves 30% installation space, protects with IP4X, withstands -25°C to +60°C environment, supports fast maintenance and intelligent monitoring (contact wear, real-time temperature feedback), and provides "highly reliable and maintenance-free" power protection solutions for industrial and mining enterprises, substations and data centers