The KYD1 normal mine low-voltage fixed switch cabinet is a kind of integrated switch device used for the starting control and protection of drive. It is used in power distribution, lighting engine control and other electric appliances in places without the danger of gas and coal dust explosions. The switch can be used in coal mine power distribution systems of the switch room for central control rooms, parking lots, general ventilation and main ventilation passages or 50HZ 3-phase 3-line neutral unearth power supply systems with 380V or 660V rated frequency of substations in dump places or other similar industrial factories, basements of high-rise buildings, large warehouses, oilfields, metro and underground buildings, etc.