The ZN28-12 series indoor high-voltage vacuum circuit breaker is a modular switchgear with a rated voltage of 12kV and three-phase AC 50Hz, which complies with the GB1984-89 standard and is suitable for efficient power protection in industrial and mining distribution, substations, and data centers. Its flexible design supports three installation methods: Integrated: The switch body is integrated with the operating mechanism, saving space and facilitating quick deployment. Lift up type: The switch body is integrated with the lifting mechanism for easy maintenance and repair. Split type: The switch body is separated from the operating mechanism, suitable for complex installation scenarios. Adopting vacuum arc extinguishing technology, the short-circuit current breaking capacity reaches 31.5kA, the mechanical life exceeds 10000 times, the protection level is IP3X, and it can withstand environments from -25 ° C to+40 ° C. It provides a "compact, efficient, safe, and maintenance free" solution.