The CV2-12X indoor high-voltage vacuum circuit breaker (hereinafter referred to as the circuit breaker) is a new generation vacuum circuit breaker developed by our company using advanced CAD/CAM/CAE design and manufacturing technology. This circuit breaker is used for control and protection in power grids with AC 50Hz and rated voltage of 12kV and below, and is widely used in industrial and mining enterprises, substations, and other places.