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 1984-2014, JB/T 3855-2008 and DL/T 403-2000 standards. Modular handcart design suitable for fixed cabinets and inflatable cabinets (C-GIS), with a protection level of IP4X, capable of withstanding environments from -25 ° C to+60 ° C, supporting quick insertion and maintenance, and optional intelligent monitoring module (contact wear, real-time temperature feedback), providing an "efficient, safe, and maintenance free" power protection solution.