Power distribution units, applied to 19'' standaed & nonstandard cabinets, are modular structure, have 38 countries’ standard socket module, 42 way output units at most, 11 kinds of power input style, 26 kinds of cable connecting plugs, 18 kinds of controling function modules, 13 kinds of protecting function modules and 2 kinds of case colour, which can meet with clients’ different technology requirement;