The KBSGZY series of flameproof mobile substations for mining and the KBZSGZY series of flameproof variable-current mobile substations for mining are suitable for use in mines where there is a risk of explosion from methane-mixed gases and coal dust. These substations consist of three main components: a dry-type transformer, a permanent magnet high-voltage vacuum switch, and a low-voltage protection box. They are equipped with various functions such as short circuit protection, overload protection, overvoltage protection, undervoltage protection, phase failure protection, electric leakage protection, electric leakage lockout, overtemperature protection, and wind, electricity, and gas lockout. These substations can convert power supplies of 6kV and 10kV into the required low-voltage power supplies for underground coal mines, such as 693(660)V, 1200(1140)V, 3450(3300)V, or 2x1905V