Eaton MD51E86 Motor drive isolation transformer - UL Listed
Part Number: MD51E86
Quick Summary
The Eaton MD51E86 motor drive isolation transformer provides isolated power for VFDs in industrial drive systems. Engineers frequently struggle with voltage fluctuations, EMI, and heat management in panels fed directly from the main bus. With UL Listed safety certification and a DT-3 dry-type design, this transformer supports compliant, safe installations in automation panels. Its 51 kVA rating and robust aluminum windings help reduce downtime and maintenance while enabling reliable motor control across industrial automation applications. Ideal for machine builders, service providers, and panel shops seeking performance, efficiency, and regulatory alignment.
Product Information
Extended Description
MD51E86 Eaton: Drive Isolation Transformer, Ventilated, Dry Type Distribution, DT-3, Three-phase, PV: 208V, Taps: 1 at +5% FCAN, 1 at -5% FCBN, SV: 460Y/266V, 150°C, 51 kVA, Al windings, Frame: 914D, uses WS39
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD51E86
UPC
786680001437
Product Length/Depth
22 in
Product Height
39 in
Product Width
29 in
Product Weight
536 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
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
208 V
Secondary Voltage
460Y/266 V
Temperature rise
150 °C rise
Volt ampere rating
51 kVA
Weathershield
WS39
Feature: DT-3 ventilated dry-type design. Business impact: improves heat dissipation, reduces enclosure cooling loads, and minimizes thermal stress on components. Application: ideal for indoor control panels in manufacturing lines where space is limited and airflow is managed. Feature: Aluminum windings. Business impact: enhances durability while reducing weight, simplifying handling and installation in confined spaces. Application: on large drive systems where frequent maintenance is required and weight is a consideration. Feature: 51 kVA rating with dual taps (+5% FCAN, -5% FCBN). Business impact: accommodates load variations and supports voltage regulation under fluctuating supply, improving drive performance. Application: suitable for high-capacity motor drives and critical equipment. Feature: Three-phase, 60 Hz operation with 208 V primary and 460Y/266 V secondary. Business impact: provides clean isolation for VFDs and motor controls, enhancing protection against transients and EMI. Application: standard in industrial automation and process control panels. Feature: WS39 Weathershield and frame 914D. Business impact: rugged enclosure protection for plant environments with improved serviceability and installation flexibility. Application: panel-mounted installations in harsh or semi-enclosed spaces. Feature: Warranty and UL Listed certification. Business impact: reduces procurement risk and accelerates compliance during panel build-outs. Application: preferred choice for regulated industries and OEMs focused on safety and traceability.
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FAQs
Plan for proper ventilation to support the DT-3 dry-type design and allow adequate clearance around a 22 in depth, 39 in height, and 29 in wide unit. Ensure bus routing minimizes EMI, provide suitable ambient conditions, and mount within a compliant enclosure. Verify mounting supports the 536 lb weight and maintains access to taps and connection points for service.
The 51 kVA rating supports substantial drive loading with room for start-up surges and motor inrush. The +/-5% taps (FCAN/FCBN) allow voltage adjustment to compensate supply variation, improving voltage stability for sensitive VFDs and motors. This translates to steadier speeds, reduced motor stress, and enhanced control accuracy in variable load conditions.
Yes. With three-phase 60 Hz operation, 208 V primary and 460Y/266 V secondary, UL Listed safety, and a rugged 914D frame, the transformer integrates into both new panel builds and retrofits. Its vented DT-3 design and aluminum windings offer reliable performance in standard industrial control environments while fitting typical enclosure layouts.
The MD51E86 carries UL Listed certification, signaling compliance with established electrical safety standards. For projects in regulated environments, confirm local codes and system-level requirements for motor control centers and VFD installations. While CE marking or IP ratings aren’t specified here, UL listing is a strong indicator of safety compliance in North American applications.
Isolation and EMI reduction contribute to longer motor life and fewer unscheduled downtimes, improving overall equipment effectiveness. The dry-type design requires minimal servicing compared with oil-filled units, while aluminum windings and a durable frame reduce replacement costs. Plan routine inspections for cooling paths, connection integrity, and tap changes to sustain performance and extend service intervals.