Eaton MD63D79CU Motor Drive Isolation Transformer - UL Listed
Part Number: MD63D79CU
Quick Summary
The Eaton MD63D79CU motor drive isolation transformer provides clean, isolated power for drive systems in industrial facilities. Engineers often struggle with voltage sags, electrical noise, and unexpected downtime when powering heavy motor drives from fluctuating supply. This unit carries UL Listed certification, reinforcing safety and reliability for critical plant deployments. Designed as a dry-type, ventilated DT-3 transformer with a 63 kVA rating, it supports 480 V primary and 480Y/277 V secondary, enabling robust, efficient drive isolation in demanding environments while integrating smoothly with WS39 weather shields and a 915D frame for dependable, scale-ready installations.
Product Information
Extended Description
MD63D79CU Eaton: Drive Isolation Transformer, Ventilated, Dry Type Distribution, DT-3, Three-phase, PV: 480 delta, Taps: 2 at +2.5% FCAN, 2 at -2.5% FCBN, SV: 480Y/277, 150°C, 63 kVA, Cu windings, Frame: 915D, uses WS39
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD63D79CU
UPC
786680071218
Product Length/Depth
22 in
Product Height
39 in
Product Width
29 in
Product Weight
695 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
915D
Tap size
2 at +2.5% FCAN, 2 at -2.5% 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
150 °C rise
Volt ampere rating
63 kVA
Weathershield
WS39
The DT-3 dry-type design provides safe, ventilated cooling, reducing enclosure cooling requirements and enhancing overall system reliability in high-load drive applications. This translates to lower operating temperatures, improved efficiency, and extended component life in manufacturing lines that demand continuous motor performance. The 63 kVA rating supports reliable power for medium-size drive systems, while the 480 V delta primary and 480Y/277 V secondary ensure seamless compatibility with common industrial power distributions. Tap changes at +2.5% and -2.5% accommodate supply variances, minimizing voltage drop-related performance loss and protecting motor windings from over- or under-voltage stress. The WS39 weather shield option offers enclosure protection for outdoor or exposed installations, reducing maintenance cycles and safeguarding performance in variable climates. Frame 915D and copper windings reinforce durability and heat tolerance, helping to meet uptime targets and regulatory expectations. UL Listed certification further confirms compliance with heavy-industry safety standards, supporting procurement decisions and reducing risk in capital projects. With a 60 Hz, three-phase configuration, this transformer integrates into standard motor drive architectures, delivering predictable startup transients and stable secondary voltages. Overall, the MD63D79CU delivers tangible uptime improvements, safer operation, and a clear path to compliant, scalable drive isolation for industrial plants.
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FAQs
For installation, mount the unit within a ventilated enclosure or outdoor-rated location using the WS39 weather shield as applicable. Connect the 480 V primary in delta configuration and the 480Y/277 V secondary to the drive controls. Verify clearances around the 39 in height and 29 in width, and secure the 915D frame to a rigid base. Confirm torque specs on all high-current connections and ensure proper labeling for maintenance access.
MD63D79CU is a three-phase, dry-type distribution transformer rated at 63 kVA with a 480 V primary (delta) and 480Y/277 V secondary. It operates at 60 Hz, features copper windings, DT-3 design, and has two primary taps at +2.5% FCAN and two at -2.5% FCBN to accommodate supply variation. The unit is rated for a 150°C rise and has a frame size 915D.
Yes. The unit is a ventilated dry-type transformer designed for industrial drive isolation, with WS39 weather shield options to protect exposed installations. Its copper windings and 150°C rise rating support reliable operation under higher ambient temperatures and dense equipment layouts, while the ventilated design helps manage heat in continuous-duty motor drive applications.
MD63D79CU carries UL Listed certification, affirming compliance with recognized electrical safety standards for industrial equipment. This certification supports procurement in regulated facilities and aligns with common safety requirements for drive isolation transformers deployed in manufacturing and processing environments.
As a dry-type, copper-wound transformer, the MD63D79CU offers low maintenance compared with oil-filled units and provides long service life in demanding environments. Its 63 kVA rating, sturdy 915D frame, and copper windings contribute to reduced downtime and predictable performance. The UL Listed status and factory warranty (one year from installation or 18 months from shipment) add risk mitigation for capital projects and predictable ROI.