The product was designed in 90's,according to the situation of our motherland,with highter performance.It can meet the demand of development in electrical power market and can compete with the introduced products.The main structure is made of 8MF opening steel.Each function chamber is independent in functions,namely function champer,generatrix and main circuit's resistance aganinst short circuit.Every MMC cabinet can be equipped with 11 single unit drawer or 22 1/2unit drawers at most.The same types of drawers are interchangeable.There are clear indicators of the state "on","off","examination","drawer out",on panel.The product can meet the needs of electricity generation or distribution system with 660V or less working voltage.It is applicable in the industry of power plant,petrochemical industry,metallurgy,textile industry,pile,power supply,etc,especially for large power plants,petrolchemical industry,etc,with higher automation level and needing interfaces with computers.