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Motor Control Center

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Product Overview & Specification Architecture

 

A Motor Control Center centralizes power distribution and motor control within a modular, freestanding enclosure lineup. Designed for industrial environments requiring coordinated feeder protection, motor starting (DOL, soft start, VFD), and real-time telemetry integration.

 
 

Core Technical Specifications

 

Parameter

Specification Standard

System Voltage

380V to 690V AC, 3-phase, 50/60 Hz

Main Busbar Rating

Up to 4000A (Electrolytic Copper 99.9% conductivity)

Short-Circuit Current Rating (SCCR)

Up to 100 kA at 480V without fuse limitation

Enclosure Protection

NEMA 1, NEMA 12, NEMA 3R, NEMA 4X / IP54 to IP65

Internal Separation (Form)

Form 2b to Form 4b (IEC 61439-2)

Standard Compliance

UL 845, CSA C22.2 No. 254, IEC 61439-1/-2

 

Variable Frequency Drive Motor Control Center

 

Product Selection & Configuration

Configuring an MCC requires defining the electrical load profile, busbar capacity, physical footprint, and unit modularity.


Main Incoming & Busbar Sizing
Calculate total connected running load plus diversity factor.
Specify busbar material: standard copper or silver-plated copper for reduced thermal resistance at bolted joints.
Define horizontal and vertical bus bracing levels based on calculated prospective fault currents (kA).
 

Starter & Feeder Unit Types
Fixed Units: Cost-effective for non-critical, continuous-run pumps and fans.
Draw-out (Withdrawable) Units: Modular plug-in buckets allowing live replacement or maintenance without shutting down the entire lineup. Interlocked disconnect handles prevent insertion or removal under load.
Drive Integration: Dedicated VFD and soft-starter compartments featuring forced-air ventilation or isolated heat-sink exhaust channels.

 

Application & Environmental Suitability
 

MCC lineups are engineered for specific operational environments where electrical reliability dictates facility uptime.

Water & Wastewater Treatment

NEMA 4X 304/316L stainless steel enclosures with conformal-coated internal PCBs to resist hydrogen sulfide and high humidity.

Oil, Gas & Petrochemical

Arc-resistant construction (Type 2B accessibility) tested to IEEE 37.20.7, mitigating internal arcing hazards in classified hazardous zones.

Heavy Manufacturing & Mining

Heavy-gauge structural steel frames designed to withstand continuous mechanical vibration and high ambient operating temperatures up to 50°C without derating.

 

 

Manufacturing Capabilities & Quality Control

Factory operations integrate precision metal fabrication, automated busbar processing, and rigorous electrical verification prior to shipment.


Enclosure Fabrication: CNC laser cutting and robotic bending maintain dimensional tolerances within +/-0.2 mm across modular vertical sections.


Busbar Machining: CNC punching, bending, and torque-controlled bolting ensure consistent contact pressure across all joint surfaces, verified via micro-ohm resistance testing.


Quality Verification & Testing: Every completed lineup undergoes dielectric withstand voltage testing (hipot), functional interlock verification, and primary current injection testing per UL 845 / IEC 61439 requirements. Factory Acceptance Testing (FAT) documentation is supplied with each serial number.

Low Voltage Motor Control Center

 

Procurement & Ordering Guide

The company conducted a competitive advantage analysis to identify its strengths and weaknesses compared to its rivals.

Drawing Submission

Provide single-line diagrams (SLD), control schematics, and spatial layout constraints of the electrical room.

01

Engineering Review

Our application engineering team verifies SCCR coordination, thermal rise calculations, and compliance with destination country electrical codes.

02

Approval Drawings

Detailed CAD and wiring schematics submitted for client sign-off within 5 business days of order placement.

03

Production & FAT

Standard production cycle runs 6 to 10 weeks, concluding with client or third-party witness FAT testing.

04

Logistics

Shipped in bolted modular shipping splits with lifting eyes, crane lifting provisions, and complete documentation packages.

05

 

FAQ

 

Q: What is the maximum short-circuit current rating (SCCR) available for your MCC lineups?

A: Standard production models achieve up to 65 kA or 100 kA at 480V without upstream current-limiting devices. Specific bracing values are verified by certified short-circuit testing laboratories matching your project's fault level requirements.

Q: Are your motor control centers certified to UL 845 or IEC 61439?

A: Yes. We manufacture compliant assemblies tailored to destination markets, holding UL 845 listings for North American projects and IEC 61439-1/-2 type-test certifications for international installations.

Q: What is the difference between fixed and draw-out (withdrawable) bucket designs?

A: Fixed units are hardwired directly to internal terminals, suitable for applications where downtime for maintenance is scheduled. Draw-out units utilize plug-in terminal blocks and mechanical guide rails, allowing rapid extraction, replacement, or bench servicing of individual starter buckets without de-energizing the main busbar.

Q: How do you manage internal heat dissipation for high-density VFD compartments?

A: Compartments housing variable frequency drives incorporate independent thermal management calculations, utilizing isolated exhaust plenums, forced-air cooling fans with replaceable intake filters, or active air-to-air heat exchangers depending on the ambient rating of the electrical room.

Q: What documentation is included with the factory shipment?

A: Each shipment includes certified dimensional general arrangement drawings, electrical schematic diagrams, bill of materials with component part numbers, torque verification logs, routine test reports, and individual device manufacturer instruction manuals.

Q: What is the standard lead time from order placement to delivery?

A: Typical production lead time ranges from 6 to 10 weeks following final drawing approval. Exact timelines depend on component availability (such as specialized protective relays or communication gateways) and the total number of vertical sections in the lineup.

As one of the most experienced motor control center manufacturers and suppliers in China, we also support customized service. We warmly welcome you to buy high quality motor control center from our factory. If you have any enquiry about pricelist, please feel free to email us.