Motor Control Center (MCC) – Industrial Component Directory Reference

Product Specifications

Technical details and manufacturing context for Motor Control Center

Definition

The Motor Control Center (MCC) is a component designed for integration into a control cabinet, serving as the central hub for starting, stopping, protecting, and monitoring multiple electric motors in industrial systems. It consolidates individual motor starters, overload relays, circuit breakers, contactors, and control devices into a single, organized enclosure, facilitating efficient power distribution, control logic implementation, and system maintenance. The MCC receives incoming power from a main distribution panel, distributing it through busbars to individual motor control units (buckets). Each unit contains components such as a circuit breaker for short-circuit protection, a contactor to make or break the motor power circuit, and an overload relay for thermal protection against excessive current. Control circuits, often at lower voltages (e.g., 24V DC or 120V AC), interface with push buttons, sensors, or a PLC to send signals that energize the contactor coils, thereby starting or stopping connected motors based on automated or manual control logic. Typical parameters include rated voltage of 380–690 V AC, rated current of 630–6300 A, short-circuit withstand rating of 50–100 kA (1 s), degree of protection IP54–IP65, operating temperature range -5 to +40 °C, relative humidity 5–95% (non-condensing), control voltage 110–240 V AC/DC, and frequency 50/60 Hz. Enclosure materials may be cold-rolled steel (SGCC) or stainless steel (304), and busbar materials may be electrolytic copper (T2) or aluminum (1060). Dimensions range from 600×2000×600 mm to 1200×2200×800 mm, with weight from 200 to 1500 kg. These values are directory references and must be confirmed for the specific model and application. Verification questions include: What are the exact rated voltage and current for your application? What short-circuit withstand rating is required? What degree of protection is needed for the environment? What control voltage and communication protocol are used? Maintenance signals include frequent tripping of overload relays, unusual heat or noise from contactors, and corrosion or moisture ingress. Failure boundaries include exceeding the rated short-circuit current, operating outside the temperature range, or using incompatible control voltages. Always verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The MCC receives incoming power from a main distribution panel. This power is distributed through busbars to individual motor control units (buckets). Each unit contains components like a circuit breaker (for short-circuit protection), a contactor (to make/break the motor power circuit), and an overload relay (for thermal protection against excessive current). Control circuits, often at a lower voltage (e.g., 24V DC or 120V AC), interface with push buttons, sensors, or a PLC to send signals that energize the contactor coils, thereby starting or stopping the connected motors based on the automated or manual control logic.

Common Materials

Galvanized Steel, Copper Busbar, Thermoplastic (for components)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Voltage	380–690 V AC	Typical low-voltage motor control centers.IEC 61439
Rated Current	630–6300 A	Main busbar rating.IEC 61439
Short-Circuit Withstand Rating	50–100 kA	1 s rating.IEC 61439
Degree of Protection	IP54–IP65	Higher IP for harsh environments.IEC 60529
Operating Temperature Range	-5–+40 °C	Above 40°C derating may apply.IEC 61439
Relative Humidity	5–95 %	Non-condensing.IEC 60721
Control Voltage	110–240 V AC/DC	Common control supply.IEC 61131
Frequency	50/60 Hz	Both 50 and 60 Hz systems.IEC 60038
Enclosure Material	Cold-rolled steel (SGCC) or stainless steel (304)	Stainless steel for corrosive areas.GB/T 11253
Busbar Material	Electrolytic copper (T2) or aluminum (1060)	Copper for higher conductivity.GB/T 5585
Dimensions (W×H×D)	600×2000×600–1200×2200×800 mm	Custom sizes available.
Weight	200–1500 kg	Depends on configuration and number of feeders.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Main Horizontal Busbar
Distributes incoming power from the main disconnect to the vertical risers and individual starter units.

Material: Copper or Aluminum
Vertical Riser Busbar
Carries power from the horizontal busbar to the individual starter buckets mounted vertically in the cabinet.

Material: Copper or Aluminum
Starter Bucket (Unit)
A removable compartment housing all components (contactor, overload relay, fuses) for controlling a single motor.

Material: Steel enclosure, various internal components
Main Circuit Breaker/Disconnect
Provides overcurrent protection and a means to isolate the entire MCC from the power source.

Material: Thermoplastic, metal alloys, silver contacts
Control Power Transformer
Steps down the main voltage to a lower, safer voltage (e.g., 120VAC, 24VDC) for the control circuits.

Material: Laminated steel core, copper windings

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Control Cabinet

View system integration details

Manufacturers of Motor Control Center

2 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Xi'an Brightway Energy Machinery Equipment Co., Ltd.

Shaanxi, CN

Founded 2012

API ISO CE IADC

Also makes: Mud Circulation System, Mud System, Centrifugal Pump and 9 more

Listed on the company's own website · profile compiled by CNFX from public sources

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HUAYANG

Shaanxi, CN

Also makes: Desanders/Desilters, Control System, Cooling System and 5 more

Listed on the company's own website · profile compiled by CNFX from public sources

View profile Send enquiry

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Frequently Asked Questions

What is a Motor Control Center (MCC) used for?

An MCC is a centralized assembly within a control cabinet that manages multiple electric motors. It provides starting, stopping, protection, and monitoring functions, consolidating components like starters, overload relays, and circuit breakers into a single enclosure.

What are typical voltage and current ratings for an MCC?

Typical rated voltage is 380–690 V AC, and rated current is 630–6300 A, per IEC 61439. These are reference ranges; the exact values depend on the specific model and application, so always verify with the manufacturer.

What standards apply to Motor Control Centers?

Common standards include IEC 61439 for low-voltage switchgear and controlgear assemblies, IEC 60529 for degrees of protection, and IEC 60038 for standard voltages. Compliance must be confirmed with the supplier for the specific product.

How does an MCC protect motors?

Each motor control unit includes a circuit breaker for short-circuit protection, a contactor for switching, and an overload relay for thermal protection. These devices work together to prevent damage from overcurrent and faults.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Atmospheric (NEMA/UL enclosure rated)
other spec:	Maximum short-circuit current rating: 65kA, Ingress protection: IP54 minimum, Humidity: ≤95% non-condensing
temperature:	-5°C to +40°C

Motor Control Center

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards