Eaton MD51E85 Motor drive isolation transformer - UL Listed
Part Number: MD51E85
Quick Summary
MD51E85 motor drive isolation transformer is designed to provide reliable electrical isolation for three-phase motor drives in industrial facilities. Engineers often struggle with voltage transients, heat buildup, and space constraints when upgrading drive systems. This model carries UL Listed certification and features a DT-3 dry-type design with WS39 weather shielding, reinforcing safety and durability. For procurement teams, the 51 kVA rating and three-phase 208 V primary enable scalable power for motor-control centers, while the ventilated enclosure enhances reliability in hot environments. The combination of rugged construction and precise voltage performance supports compliant, efficient drive integration across harsh industrial environments.
Product Information
Extended Description
MD51E85 Eaton: Drive Isolation Transformer, Ventilated, Dry Type Distribution, DT-3, Three-phase, PV: 208V, Taps: 1 at +5% FCAN, 1 at -5% FCBN, SV: 230Y/133V, 150°C, 51 kVA, Al windings, Frame: 914D, uses WS39
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD51E85
UPC
786680001260
Product Length/Depth
22 in
Product Height
39 in
Product Width
29 in
Product Weight
480 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
230Y/133 V
Temperature rise
150 °C rise
Volt ampere rating
51 kVA
Weathershield
WS39
Feature: Three-phase 208 V primary and 51 kVA rating enable scalable power delivery for motor drives. Business Impact: Supports growing automation loads without oversized infrastructure, reducing CAPEX and footprint. Application: Suitable for VFD-driven conveyors and pumps in modern manufacturing lines. Feature: DT-3 dry-type design with ventilated enclosure. Business Impact: Improves cooling efficiency and safety, lowering heat-related failures and fire risk. Application: Industrial motor control panels exposed to elevated ambient temperatures. Feature: Frame 914D with aluminum windings. Business Impact: Durable mounting compatibility and corrosion resistance for long service life in harsh environments. Application: Plant floors, outdoor installations, and refurbished facilities. Feature: Tap options at +5% FCAN and -5% FCBN. Business Impact: Enables precise voltage adjustments to accommodate site variations, minimizing harmonics and voltage drop. Application: Facilities with variable input conditions or long feeders. Feature: WS39 weather shield and ventilated construction. Business Impact: Enhanced environmental protection and heat dissipation, boosting uptime in hot or dusty environments. Application: Outdoor or semi-enclosed electrical rooms and equipment pads. Feature: 60 Hz operation with UL Listed certification. Business Impact: Quick adherence to safety standards, faster project approvals, and reduced commissioning risk. Application: All standard industrial power distributions requiring drive isolation and safety compliance.
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FAQs
The MD51E85 uses a ventilated DT-3 dry-type enclosure with a 914D frame. Ensure adequate clearance for cooling, allow for WS39 weather shielding if installed outdoors, and provide proper mounting on a stable surface. Verify space for taps and access during maintenance.
It features a 208 V primary input, a 230Y/133 V secondary, 60 Hz operation, three-phase configuration, and a 51 kVA rating with taps at +5% FCAN and -5% FCBN to accommodate voltage variations in the field.
Yes, the MD51E85 is UL Listed, indicating safety compliance for electrical components used in industrial settings. This helps speed regulatory approvals and reduces risk during installation and startup.
Ideal for motor drives and VFDs in conveyors, pumps, and CNC machines, where isolating drive electronics from supply transients improves reliability, reduces noise, and protects sensitive control gear.
Warranty is one year from installation or eighteen months from shipment, whichever comes first. Regular maintenance should include inspection of the WS39 shield, cooling clearances, and verification of tap settings during periodic electrical testing.