Premium Membership ♕

Save 50% on all Video Courses with Enterprise Membership Plan and study specialized LV/MV/HV technical articles and guides.

Motor control

Power distribution systems used in large commercial and industrial applications can be complex. Power may be distributed through switchgear, switchboards, transformers, and panelboards. Power distributed throughout a commercial or industrial application is used for a variety of applications such as heating, cooling, lighting, and motor-driven machinery.

Basics of Motor Control Centers - SIEMENS (on photo: New Motor Control Center and power distribution board up to 7000 amperes)
Basics of Motor Control Centers – SIEMENS (on photo: New Motor Control Center and power distribution board up to 7000 amperes)

Basic Motor Control

Wherever motors are used, they must be controlled.

Basic motor control
Basic motor control

In Basics of Control Components you learned how various control products are used to control the operation of motors.

The most basic type of AC motor control, for example, involves turning the motor on and off. This is often accomplished using a motor starter made up of a contactor and an overload relay.

The contactor’s contacts are closed to start the motor and opened to stop the motor. This is accomplished electromechanically using start and stop pushbuttons or other pilot devices wired to control the contactor.

The overload relay protects the motor by disconnecting power to the motor when an overload condition exists. Although the overload relay provides protection from overloads, it does not provide short-circuit protection for the wiring supplying power to the motor. For this reason, a circuit breaker or fuses are also used.

Typically one motor starter controls one motor. When only a few geographically dispersed AC motors are used, the circuit protection and control components may be located in a panel near the motor.

Motor Control Centers (MCC)

In many commercial and industrial applications, quite a few electric motors are required, and it is often desirable to control some or all of the motors from a central location. The apparatus designed for this function is the motor control center (MCC).

Motor control centers are simply physical groupings of combination starters in one assembly.

A combination starter is a single enclosure containing the motor starter, fuses or circuit breaker, and a device for disconnecting power.

Other devices associated with the motor, such as pushbuttons and indicator lights may also be included.

Title:Basics of Motor Control Centers – SIEMENS
Size:4.3 MB
Download:Right here | Video Courses | Membership | Download Updates
Basics of Motor Control Centers - SIEMENS
Basics of Motor Control Centers – SIEMENS

Premium Membership

Get access to premium HV/MV/LV technical articles, advanced electrical engineering guides, papers, and much more! It will help you to shape up your technical skills in your everyday life as an electrical engineer.
50% Discount 💥 - Save 50% on all 90+ video courses with Enterprise Membership plan.

More Information


  1. carina
    May 15, 2023

    I want to share the latest technology trend of the motor control center

  2. Edgar De Guzman
    Mar 12, 2023

    Do we require the use of energy meter per MCC?

    Jan 17, 2023

    Can i place MCC inside Low voltage Switch Room together with other Switchboards

  4. Jean-Christian
    Sep 21, 2022

    What is minimum spaces in between office table and MCC 600V?

  5. sher abbas
    Aug 02, 2022

    dear sir,
    at motor control unit have 1 regulator switch for connecting power supply what’s have name

  6. Kumar Pershad
    May 25, 2022

    Looking for information on MCC.

    Feb 19, 2022

    i want to set up MCC Panel with 10 motors and panelboard for lightings and power outlet.

  8. Ray Grillot
    Feb 02, 2022

    Are there any set standards for numbering breakers in an MCC?

  9. ranjithkumar j
    Nov 30, 2021

    Hi can you please forward me the 4.3mb Basics of motor control centers because

  10. vusi Dlamini
    Jan 08, 2021

    I need to set up panels for MCC. for 12 electric motors

  11. nexa electrical supplies
    Feb 17, 2020

    thanks for sharing useful information

  12. Rabah
    Nov 08, 2019

    please can you forward me the 4.3 MB Basics of Motor Control Centers

  13. Anthony Millward
    Sep 15, 2019

    What is the maximum ambient operating environment recommended for a MCC?

Leave a Comment

Tell us what you're thinking. We care about your opinion! Please keep in mind that comments are moderated and rel="nofollow" is in use. So, please do not use a spammy keyword or a domain as your name, or it will be deleted. Let's have a professional and meaningful conversation instead. Thanks for dropping by!

77  −  sixty nine  =  

Learn How to Design Power Systems

Learn to design LV/MV/HV power systems through professional video courses. Lifetime access. Enjoy learning!

Subscribe to Weekly Newsletter

Subscribe to our Weekly Digest newsletter and receive free updates on new technical articles, video courses and guides (PDF).
EEP Academy Courses - A hand crafted cutting-edge electrical engineering knowledge