Electrical system of extractable unit for maintaining and controlling communication connection

The utility model provides a connector arrangement for a set of electrical system (10), such as a motor control center. The connector arrangement provides component connector assemblies (28) and (82) which are arranged on component supporting pieces (24) and are used for supplying a plurality of network signals and control power to a plurality of components (26) on the component supporting pieces (24); a matched connector assembly (50) for preliminary connection is arranged in the shell (12) and is made to be matched with the component connector assemblies (28) and (82) when the component supporting pieces (24) are fully jointed in the shell (12); accordingly, the component supporting pieces (24) can be partially extracted from the shell (12) so as to stop supplying main power to the component supporting piece (24) and use the matched connector assembly (50) and the component connector assemblies (28) and (82) to keep the component supporting pieces (24) being connected with the network and control the power