Eaton MD330E79FCU Motor drive isolation transformer - UL
Part Number: MD330E79FCU
Quick Summary
Eaton MD330E79FCU is a motor drive isolation ventilated transformer for three-phase drive and distribution systems. In busy facilities, heat buildup, cooling challenges, and downtime can throttle productivity. This unit carries UL Listed safety certification and uses a DT-3 dry-type design with copper windings for reliable operation in harsh environments. Its 330 kVA rating, 480 V primary, and 480Y/277 V secondary support robust motor drives and distribution panels, while taps at +5% and -5% help accommodate voltage fluctuations. The WS35 weather shield option and rugged construction further enhance durability, enabling predictable performance in plant floors and switchgear rooms, with measurable improvements in energy management and maintenance costs.
Product Information
Extended Description
MD330E79FCU Eaton: Drive Isolation Transformer, Ventilated, Dry Type Distribution, DT-3, Three-phase, PV: 480 delta, Taps: 1 at +5% FCAN, 1 at -5% FCBN, SV: 480Y/277, 115°C, 330 kVA, Cu windings, Frame: 919E, uses WS35
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD330E79FCU
UPC
786680061127
Product Length/Depth
36.23 in
Product Height
75 in
Product Width
44.2 in
Product Weight
3398 lb
Warranty
Eaton Selling Policy 25-000, one (1) year from the date of installation of the Product or eighteen (18) months from the date of shipment of the Product, whichever occurs first.
Certifications
UL Listed
Coil material
Copper
Design
DT-3
Frame
919E
Tap size
1 at +5% FCAN, 1 at -5% FCBN
Type
Dry Type Distribution, Drive Isolation Transformer
Frequency rating
60 Hz
Phase
Three-phase
Primary voltage
480 V
Secondary Voltage
480Y/277 V
Temperature rise
115 °C rise
Volt ampere rating
330 kVA
Weathershield
WS35
Commercial Distribution, Transformers, Volume 2, Tab 2
Eaton Specification Sheet - MD330E79FCU
Selling Policy 25-000 - Distribution and Control Products and Services
DT-3 dry-type, ventilated construction with copper windings minimizes heat buildup and eliminates oil-related maintenance. This design reduces cooling requirements and lowers the total cost of ownership, making it ideal for continuous‑duty drive applications in constrained spaces. Applications include motor drives and distribution panels in manufacturing floors where safety and reliability are critical. The 330 kVA rating at 60 Hz provides substantial headroom, reducing the need for oversized spare transformers and supporting peak load conditions with improved efficiency and reduced energy waste. Primary 480 V delta and secondary 480Y/277 V enable seamless integration with common industrial power architectures, while voltage taps of +5% and -5% support regulation during supply fluctuations. This configuration improves motor performance and reduces nuisance tripping in variable power environments. Copper windings offer high conductivity and durability, and WS35 weather shield expands protection in outdoor or damp environments, lowering long-term maintenance. The 919E frame and solid weight contribute to stable mounting and reduced vibration, while the listed warranty provides predictable support through start-up and operation. Compatibility with standard control panels and distribution gear simplifies installation and commissioning, delivering faster return on investment for plant-wide projects.
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FAQs
The MD330E79FCU is designed for a 480 V three-phase primary and a 480Y/277 V secondary with a 330 kVA rating. It employs a DT-3 dry-type construction with copper windings and provides voltage taps at +5% and -5% to accommodate distribution system swings. This combination ensures reliable drive isolation for motor systems while maintaining compatibility with common industrial switchgear and control panels.
Key specs include 330 kVA Va rating, 60 Hz frequency, three-phase operation, primary 480 V, secondary 480Y/277 V, copper windings, and a 115 °C rise rating. The unit uses a DT-3 dry-type design and is framed in 919E with WS35 weather shielding available. Taps provide voltage regulation, enhancing performance in fluctuating power environments.
Yes. The 330 kVA rating at 60 Hz supports high-demand motor drives used in conveyors, presses, and heavy machinery. Its dry-type, ventilated design minimizes maintenance needs and helps with heat management in crowded electrical rooms. The copper windings and reinforced frame contribute to durability, while the voltage taps aid in maintaining motor performance under supply variations.
The MD330E79FCU carries UL Listed certification, validating safety compliance for installation and operation in industrial environments. This qualification supports reduced risk during commissioning and ongoing maintenance, and pairs with Eaton’s documented warranty and service commitments for lifecycle support.
Plan for standard dry-type transformer maintenance: periodic thermal checks, insulation integrity verification, and routine inspection of cooling paths. The unit’s WS35 shield option helps protect against harsh conditions, reducing cleaning and corrosion concerns. The warranty offers 1 year from installation or 18 months from shipment, whichever comes first, supporting uptime during initial operation and ramp-up.