Eaton MD63E91 Motor drive isolation transformer - UL Listed
Part Number: MD63E91
Quick Summary
The Eaton MD63E91 motor drive isolation ventilated transformer delivers clean, isolated power for drive systems in industrial equipment. Engineers struggle with overheating, noise, and reliability during motor startup and variable loads. Key certifications include UL Listed safety, NEMA ST-20 sound performance, and 150 °C insulation rise, ensuring compliance and durability in harsh factory environments. As a dry-type distribution solution, this 63 kVA, three-phase transformer with WS39 weathershield integrates with standard control panels, improving installation efficiency and long-term uptime. For OEMs and maintenance teams, the combination reduces thermal management concerns and simplifies stocking with a single, UL-listed unit. The modular design facilitates retrofit and scalable automation projects across plants, speeding commissioning and minimizing spare-part fragmentation.
Product Information
Extended Description
MD63E91 Eaton: Drive Isolation Transformer, Ventilated, Dry Type Distribution, DT-3, Three-phase, PV: 460 delta, Taps: 1 at +5% FCAN, 1 at -5% FCBN, SV: 230Y/133V, 150°C, 63 kVA, Al windings, Frame: FR914D, uses WS39
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD63E91
UPC
786680331374
Product Length/Depth
22 in
Product Height
39 in
Product Width
29 in
Product Weight
540 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
Aluminum
Design
DT-3
Frame
914D
Insulation
220 °C
Material
Aluminum
Tap size
1 at +5% FCAN, 1 at -5% FCBN
Type
Dry Type Distribution, Drive Isolation Transformer
Wiring connection
286D
Frequency rating
60 Hz
Kva Rating
63 kVA
Phase
Three-phase
Primary voltage
460 V
Secondary Voltage
230Y/133 V
Sound Level
NEMA ST-20
Temperature rise
150 °C rise
Volt ampere rating
63 kVA
Weathershield
WS39
Feature: Ventilated dry-type DT-3 design provides effective heat removal in enclosed motor-drive panels, reducing thermal derating and extending transformer life. Business Impact: Improved uptime and lower maintenance costs under high-start-current and long-duty-cycle conditions translate to less unscheduled downtime and more predictable line performance. Application: Ideal for automation and motion-control systems that demand reliable drive isolation. Feature: Primary 460 V, secondary 230Y/133 V with taps at +5% and -5% FCAN/FCBN; Business Impact: Voltage regulation and bus stability across fluctuating plant power reduce nuisance trips and control drift. Application: Drives, inverters, and PLC rails in mid-size manufacturing cells. Feature: Aluminum windings and FR914D frame with 220 °C insulation; Business Impact: Durable, corrosion-resistant construction and a wide insulation margin support reliable operation in harsh environments. Application: Installations near production lines, machine rooms, or outdoor locations using WS39. Feature: WS39 Weathershield option for outdoor or exposed indoor environments; Business Impact: Protects windings from dust, moisture, and weather, reducing enclosure requirements and speeding installation. Application: Plant exteriors, weather-exposed switchgear, and open-panel deployments in tough facilities. Feature: 63 kVA rating, three-phase, 60 Hz; Business Impact: Provides ample capacity for medium-load drive applications, reducing the need for paralleling transformers and cutting total installed cost. Application: Drive isolation for conveyors, packaging, metals, and material-handling lines. Feature: 150 °C insulation rise and UL Listed certification; Business Impact: Robust thermal margin supports reliability and simplifies compliance, maintenance planning, and audits. Application: Critical automation paths in plants where uptime matters.
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FAQs
MD63E91 is a three-phase, dry-type transformer optimized for motor-drive panels. Ensure ventilated mounting with the FR914D frame and WS39 weathershield compatible locations. It uses 460 V primary and 230Y/133 V secondary, with taps at +5% and -5%. Wiring connection 286D; UL Listed and NEMA ST-20 compliant for industrial applications.
The MD63E91 is a 63 kVA, three-phase transformer rated for 60 Hz, with a 460 V primary and a 230Y/133 V secondary. It employs a DT-3 design in a FR914D frame, uses aluminum windings, and is designed for ventilated installations. Taps include +5% and -5% adjustments to support voltage regulation.
Yes, the MD63E91 supports WS39 weather shield options, enabling outdoor or exposed indoor installations. The ventilated, dry-type design makes it suitable for harsh environments when paired with the weather shield, while maintaining isolation performance for motor-drive panels and critical automation power paths.
The MD63E91 carries UL Listed certification, with NEMA ST-20 sound performance ratings. These certifications support regulatory compliance, safer electrical installation, and smoother audits for industrial facilities and OEMs specifying drive isolation transformers within automation cabinets.
The MD63E91 reduces maintenance costs through improved thermal management, lower risk of thermal derating, and longer service life due to robust insulation and ventilated cooling. Its UL Listed status and proven three-phase drive isolation design enable predictable uptime, simplified spare-part management, and faster commissioning for mid-size automation projects.