Eaton MD51E92CU Motor Drive Isolation Transformer - UL Listed
Part Number: MD51E92CU
Quick Summary
MD51E92CU is Eaton's motor drive isolation ventilated transformer that protects drive electronics in three-phase industrial motor systems. Engineers often struggle with overheating and transient voltage during drive startups, risking equipment damage and unplanned downtime. This unit carries UL Listed certification for safety and reliability; regional CE and IP compliance should be confirmed by the installer as part of the deployment plan. By combining a dry-type design with drive isolation, copper windings, and adjustable taps, it delivers safer isolation, efficient power transfer, and straightforward installation for modern motor drives in manufacturing and processing environments.
Product Information
Extended Description
MD51E92CU 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: 460Y/266V, 150°C, 51 kVA, Cu windings, Frame: 914D, uses WS39
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD51E92CU
UPC
786685266930
Product Length/Depth
22 in
Product Height
39 in
Product Width
29 in
Product Weight
570 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
914D
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
460 V
Secondary Voltage
460Y/266 V
Temperature rise
150 °C rise
Volt ampere rating
51 kVA
Weathershield
WS39
Ventilated dry-type distribution design provides robust thermal performance, reducing derating and boosting drive reliability, especially under continuous motor loading. Feature → Business Impact → Application: Thermal management minimizes unplanned shutdowns in high-duty-cycle conveyors and packaging lines, enabling longer equipment life and lower maintenance costs. Feature → Business Impact → Application: Drive isolation transformer topology protects sensitive VFD/drive circuitry from voltage transients, improving overall system uptime for metal fabrication and plastics processing. Feature → Business Impact → Application: 460 V delta primary with 460Y/266 V secondary and taps at +5% and -5% offers flexible interfacing to a wide range of motors and drives, reducing external transformer needs and field rewiring. Feature → Business Impact → Application: Copper windings and a DT-3 dry-type design deliver high efficiency and low loss, supporting energy savings in continuous production lines. Feature → Business Impact → Application: Frame 914D and 51 kVA rating provide sturdy, scalable capacity for medium-sized drive installations, minimizing the number of transformers required. Feature → Business Impact → Application: WS39 weather shield enhances enclosure protection in harsh environments, while UL Listed certification confirms safety and reliability for industrial deployments. Feature → Business Impact → Application: Clear installation advantages, including weight and dimensions (570 lb, 22 in L, 29 in W, 39 in H), simplify on-site handling and rack integration.
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FAQs
Yes. The MD51E92CU is a three-phase, dry-type drive isolation transformer with a 460 V primary and 460Y/266 V secondary, designed to integrate with existing VFDs and motor drives. Its DT-3 design, 914D frame, and standard wiring simplify mounting in existing switchgear or equipment rooms. Verify clearance, connection layout, and enclosure protection (WS39) for a trouble-free retrofit.
Key specs include a 51 kVA rating, 60 Hz frequency, three-phase operation, 460 V primary, and 460Y/266 V secondary. It features copper windings, a 150 °C temperature rise, and taps at +5% and -5% for voltage flexibility. The unit is a ventilated, dry-type distribution transformer designed to minimize losses and manage thermal loads in drive environments.
Ideal for mid-sized drive isolation needs in manufacturing, packaging, and process equipment where VFDs or servo drives require electrical isolation and voltage conditioning. The combination of a ventilated dry-type DT-3 design, copper windings, and adjustable taps supports reliable operation under transient conditions and reduces the risk of drive damage from voltage spikes.
The MD51E92CU carries UL Listed certification, signaling adherence to recognized safety standards for industrial power transformers. Regional regulatory requirements, such as CE or IP enclosure ratings, may vary by installation location and should be confirmed with your compliance team before deployment to ensure full conformity.
Rely on Eaton’s warranty policy (1 year from installation or 18 months from shipment) and standard support programs. The solid construction, copper windings, and reliable isolation reduce maintenance downtime and equipment failure, delivering lower total cost of ownership through improved uptime, energy efficiency, and streamlined on-site installation.