The XGN☐-12 type box-type fixed indoor AC metal-enclosed switchgear (referred to as high-voltage switchgear) is a three-phase AC 50Hz, rated voltage 12kV indoor complete power distribution device. In the power system, it serves as a receiver and distributor of electrical energy for industrial and mining enterprises, power plants, and substations, while also providing control, measurement, and protection functions for the circuits. This product adopts a fully assembled structure, with each compartment separated by well-grounded partitions. Each high-voltage compartment has an independent pressure relief channel, and the protection level is IP2X. The switchgear is equipped with ZN28-12 series indoor high-voltage vacuum circuit breakers. The operating mechanisms of the disconnecting switches and grounding switches are rotary fully mechanical interlocking mechanisms, ensuring complete and reliable interlocking. Interlocking devices are installed between the circuit breakers, disconnecting