Motor Control Center – BCH Electric Limited

Motor Control Center
Motor control center‘s (MCC) is an assembly that controls electric motors.
Its made of multiple enclosed sections with a common power bus. A combination starter is present at every section, which in turn contains a motor starter, circuit breaker, a power disconnect, and fuses. A motor control center (MCC) can be linked to an electric service entrance for the building. A motor control center (MCC) may also incorporate light indicators, logic controllers, push-buttons, and frequency drives.
A motor control center (MCC) is used in commercial buildings to control all electric motors, like a mechanical or electrical room center.

Voltage ranges

Motor control centers (MCC) are customarily used for three-phase AC motors, varying from 208 V to 600 V. For large motors that run at 2300 V to 15000 V, medium- voltage motor control centers are used. These motor control centers (MCC) consists of vacuum contactors and separate compartments for switch and control of power.


Since the 1950s, automobile manufacturing industries are mostly using motor control centers (MCC). Today motor control centers (MCC) are also being used in many other industries for commercial applications. Motor control centers (MCC) may be placed in a separate room with air-conditioning if very dusty processes are being used in the industry, but often a motor control center (MCC) will be installed on adjacent floors to controlled machinery.


A motor control center (MCC) consists of sections of a vertical metal cabinet with a power bus and provision for individual motor controllers’ plug-in mounting. For testing and maintenance, small controllers can be unplugged, but Extensive controllers are stationary. Each motor control center (MCC) has a contactor, and overload relays to protect the motor, fuses, or a circuit breaker from providing short-circuit protection and isolate the motor circuit, and there’s a disconnecting switch. In the controller, the motor is wired to the terminals. Motor control center (MCC) offers wire ways to power cables for field control.

Fire protection

Motor control centers (MCC) are generally placed on floors, which requires a fire-resistance rating. For those cables that go through walls or floors, firestops are required.
In a Motor control center (MCC), each motor controller can be designated as:
1.  Control transformers
  1. Pilot lamps
  2. Control switches
  3. Terminal blocks with extra control
  4. Thermal or solid-state overload protection relay or power fuses or types of circuit breakers.
A motor control center (MCC) can be supplied ready for the customer to arrange all of the wirings. It can be an assembly with interlocking wiring and control internally to a terminal panel board with a central controller or a programmable controller.


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