What is an MCC?
MCC stands for Motor Control Center and is a centralised switchgear cabinet in which several motor starters and the associated control and protection components are housed. MCCs are used to safely and efficiently drive electric motors in industrial installations.
An MCC is the “motor hub” of a plant or installation, providing tidy cabling, simple operation and rapid servicing.
🧠 How does an MCC work?
- Compartmentalised layout
- Each compartment contains a single motor starter (e.g. DOL, soft starter or VFD)
- Built from modular units: easily extended or replaced
- Components
- Contactors, fuses, thermal protection, metering modules
- PLC interfaces, IO modules, control panels and emergency stop switches
- Sometimes equipped with communication via ProfiNET, Profibus or Ethernet IP
- Power supply and distribution
- Power supply via main and branch busbars
- Distribution to motors via fuses and protection devices
🏭 Application of MCCs in OT environments
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Installations with multiple electric motors, such as in:
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Water treatment plants
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Chemical plants
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Food production
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Power stations
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Central location for motor operation and maintenance
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Part of a control cabinet or technical room
MCCs improve maintainability, oversight and safety in motor control.
🔍 MCC vs. decentralised motor control
| Characteristic | MCC | Decentralised control |
|---|---|---|
| Location | Centralised | In the field, close to the motor |
| Maintenance | Single point, well organised | Dispersed, harder to access |
| Flexibility | Modular, expandable | Less flexible |
| Cabling | Simpler, shorter control cables | Long power cables |
| Communication | Possible via fieldbus or Ethernet | Often required for decentralised I/O |
🔐 Safety considerations
- Protection against overload, short-circuits and phase loss
- Interlocking provisions between compartments
- Key systems or electrical interlocks during maintenance
- Access Control for operation (key switches, HMI or PLC)
- Combined with Monitoring, SIEM or anomaly detection for fault analysis
Modern MCCs can also integrate Condition Monitoring for predictive maintenance.
📌 In summary
An MCC is a modular system for centrally driving, protecting and monitoring electric motors in industrial installations. It provides oversight, safety and scalability for complex production environments.