It is motor control centre usually type of penal and combination of many components like feeders, electrical buses, circuit breaker and fuses etc with having common power bus. MCC is used in industrial and process applications where lots of motors are used with variable loads. This panel makes it centralized.
In some places Control panel and Motor control centre are used in one panel.
The following picture shows the simple diagram and circuitry.
This operation is like manual panel system and motor is located at far distance from master control room. Engineers and technicians easily access the circuitry and can check the any fault or regular checking of the circuitry.
This panel name shows the function control has the controller device (PLC) in its circuitry. This is main control which provides the digital inputs (logical input) to MCC and then MCC derive the motors. It consists of relays, breakers and mainly controller device PLC, DCS etc. This is programmable controller device thus we can program the device and would run on our desired values.