The Control Panel operates at less than 600V and consists of power circuits and/or control circuits. A control circuit provides the signals directing the performance of the controlled equipment but doesn't carry the main power or include the controlled equipment. The panel part means the control system is mounted on (or in) an enclosure or subpanel. The panel could be a collection of contactors and breakers which control the power distribution for a buildings lighting system. The PLC panel is a special steel box that contains electrical components required to run a factory machine or process. Control Panel is very useful.