The KYN28A-12(24)KV indoor AC metal-clad withdrawable switchgear is a new generation of advanced medium-voltage switchgear. It is suitable for three-phase AC power systems with rated voltages of 12KV and 24KV, and a rated frequency of 50(60)Hz. It is primarily used in power plants, industrial and mining enterprises, and power systems for receiving and distributing electrical energy, as well as for controlling, protecting, monitoring circuits, and starting high-voltage motors. The frame is made of aluminum-zinc coated steel plates processed by precision CNC machine tools, featuring a double-layer superimposed internal folding process, high-strength rivet splicing, precise coordination, and high mechanical strength.