A motor control center (MCC) is an assembly to control some or all motors in a central location. It consists of multiple enclosed sections having a common power bus and with each section containing a combination starter, which in turn consists of motor starters or circuit breakers, and power dissconnect. A motor control center can also include push buttons, indicator lights,VFD, PLC, and metering equipment. It may be combined with the electrical service entrance for the building.
MCC's are typically found in large commercial or industrial buildings where there are many electric motors that need to be controlled from a central location,such as a meachanical room or electrical room.
Motor control centers have been used since 1950 by the automobile manufacturing industry which used large numbers of electric motors. Today they are used in many industrial and commercial applications. Where very dusty or corrosive processes are used, the motor control center may be installed in a separate air-conditioned room, but often an MCC will be on the factory floor adjacent to the machinery controlled.
Each motor controller in an MCC can be specified with a range of options such as separate control transformers, pilot lamps, control switches, extra control terminal blocks, various types of thermal or solid-state overload protection relays, or various classes of power fuses or types of circuit breakers. A motor control center can either be supplied ready for the customer to connect all field wiring, or can be an engineered assembly with internal control and interlocking wiring to a central control terminal panel board or programmable controller.