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Low Voltage Motor Control Center (MCC)

The Low Voltage Motor Control Center (MCC) is a power distribution equipment for centralized control, protection, and monitoring of motors, adopting draw-out structure, featuring compact structure, safe operation, easy maintenance, and high reliability.
Widely used in metallurgy, chemical, automotive manufacturing, food processing, water treatment, mining and other industrial fields, it supports multiple starting methods including DOL, star-delta, soft starter, and VFD. It is a core equipment for intelligent motor management.


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Technical Parameters

Electrical Performance Parameters

Parameter	Specification
Rated Voltage	400V / 690V
Rated Insulation Voltage	1000V
Rated Frequency	50Hz / 60Hz
Main Busbar Rated Current	1000A ~ 6300A
Drawer Unit Rated Current	16A ~ 630A
Rated Short-Time Withstand Current	30kA / 50kA / 80kA / 100kA (1 Second)
Rated Peak Withstand Current	63kA / 105kA / 176kA / 220kA
Structure Type	Draw-out Type / Fixed Type
Installation Method	Floor-Standing

MCC Drawer Unit Specification Table

Drawer Height	Rated Current (A)	Motor Power Reference (kW)	Application
1	1/4 Unit	≤ 63A	≤ 30kW
2	1/2 Unit	≤ 125A	≤ 75kW
3	1 Unit	≤ 250A	≤ 132kW
4	2 Units	≤ 400A	≤ 250kW
5	3 Units	≤ 630A	≤ 400kW

MCC Main Functional Units

Unit Type	Function	Main Components
Direct On-Line (DOL) Unit	Direct motor starting	Circuit Breaker, Contactor, Thermal Relay
Star-Delta Starting Unit	Star-delta reduced voltage starting	Circuit Breaker, 3 Contactors, Thermal Relay, Timer
Soft Starter Unit	Soft starting, reduced impact	Circuit Breaker, Soft Starter, Bypass Contactor
VFD Unit	Variable frequency speed regulation	Circuit Breaker, VFD, I/O Reactors, Filter
Feeder Unit	Power distribution	Circuit Breaker, Contactor (Optional)
Intelligent Protection Unit	Intelligent protection & monitoring	Intelligent Motor Protector

MCC Complete Parameter Table

No.	Main Busbar Current (A)	Short-Time Withstand Current (kA/1s)	W (mm)	D (mm)	H (mm)
1	1000	30	600	800	2200
2	1600	30	600	800	2200
3	2000	50	800	1000	2200
4	2500	50	800	1000	2200
5	3150	50	1000	1000	2200
6	4000	80	1000	1200	2200
7	5000	80	1200	1200	2200
8	6300	100	1200	1400	2200

Applications

Application	Recommended Configuration	Key Advantages
Metallurgy	VFD + Intelligent Protection	Impact resistant, high reliability
Chemical Industry	Soft Starter + Explosion-Proof	Explosion-proof design, safe and reliable
Automotive Manufacturing	VFD + Communication Network	Automated control, remote monitoring
Food Processing	Stainless Steel Enclosure + Soft Starter	Hygienic, easy cleaning, soft starting
Water Treatment	Star-Delta + Intelligent Protection	Continuous operation, reliable protection
Mining	Soft Starter + Dust-Proof	Dust-proof design, suitable for harsh environments
HVAC	VFD	Energy-saving speed regulation, reduced energy consumption
Paper Industry	VFD + Intelligent Protection	High precision speed regulation, continuous operation

Selection Guide

Starting Method Selection

Starting Method	Applicable Power	Features
DOL	≤ 132kW	Simple, economical, high starting current
Star-Delta	≤ 250kW	Reduced voltage starting, reduced impact
Soft Starter	≤ 400kW	Smooth starting, reduced mechanical impact
VFD	≤ 400kW	Stepless speed regulation, significant energy savings

Motor Protection Selection

Protection Method	Applicable Scenario	Features
Thermal Relay	General motor protection	Economical, overload protection
Electronic Protector	Higher requirement applications	Complete functions, high accuracy
Intelligent Motor Protector	Critical motors, smart factories	Comprehensive protection, communication networking

Drawer Unit Quantity Calculation

Determine the number of drawer units based on motor quantity and power:

Motor Power (kW)	Required Drawer Height	Max Units per Cabinet
≤ 30kW	1/4 Unit	36
30-75kW	1/2 Unit	18
75-132kW	1 Unit	9
132-250kW	2 Units	4
250-400kW	3 Units	3

Customization Services

Sline provides comprehensive customization services for Low Voltage MCC based on your project requirements:

Customization Option	Description
Main Busbar Current	1000A ~ 6300A / Optional
Short-Time Withstand Current	30kA / 50kA / 80kA / 100kA / Optional
Starting Method	DOL / Star-Delta / Soft Starter / VFD
Protection Method	Thermal Relay / Electronic Protector / Intelligent Motor Protector
Communication Protocol	Modbus / Profibus / Ethernet / Profinet / Optional
Protection Class	IP30 / IP40 / IP54 / Optional
Enclosure Material	Cold Rolled Steel / Stainless Steel
Special Environment	Explosion-proof, dust-proof, anti-corrosion, high altitude, etc.

For detailed technical drawings or customized solutions, please contact the Sline technical team. We will provide one-on-one engineer-led service throughout the process.