This equipment is the new generation of modular, multifunctional ring main unit switchgear with high reliability, compact size and free of maintenance, which is applicable to ring network power supply or dual radiation power supply of 10-35kV power supply line, and also the terminal power supply; the electric power of the supplied area will be controllable and protected; it is widely applied to unban ring network power distribution system, larger factory and residential area, etc. with high power supply load density and cable feeding network.