The VZG-12GD indoor high-voltage three position vacuum circuit breaker is an intelligent switchgear designed specifically for 12kV distribution systems. It integrates the functions of closing, opening, and grounding, and is suitable for high-frequency operation scenarios in industrial and mining enterprises, substations, and data centers. Adopting vacuum arc extinguishing technology, the short-circuit current breaking capacity reaches 31.5kA, and the mechanical life exceeds 20000 times, which complies with GB/T 1984-2014standards.