Eaton MD51E89 Motor Drive Isolation Transformer - UL Listed
Part Number: MD51E89
Quick Summary
MD51E89 motor drive isolation transformer provides clean, stabilized power to industrial motor drives and control panels. This unit helps prevent nuisance trips and voltage transients that can degrade drive life and production uptime. UL Listed safety certification supports compliant installation in demanding environments. The dry-type, ventilated design with aluminum windings and WS39 weather shield is well-suited for factory floors and outdoor enclosures. By isolating the drive from input disturbances, it supports consistent performance while enabling standard 60 Hz, three-phase power layouts. In addition to robust electrical isolation, this transformer delivers scalable kVA support and easy taps, supporting a range of automation applications with reliable, maintenance-friendly operation.
Product Information
Extended Description
MD51E89 Eaton: Drive Isolation Transformer, Ventilated, Dry Type Distribution, DT-3, Three-phase, PV: 230 delta, 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
MD51E89
UPC
786680330551
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
230 V
Secondary Voltage
460Y/266 V
Temperature rise
150 °C rise
Volt ampere rating
51 kVA
Weathershield
WS39
Feature: Ventilated dry-type DT-3 design with WS39 weather shield; Business Impact: Enhanced cooling and environmental resilience reduce thermal derating and enclosure corrosion, extending service life in demanding environments. Application: Suitable for factory floors, outdoor electrical rooms, and harsh industrial spaces. Feature: 51 kVA three-phase power rating; Business Impact: Supports multiple drives and concurrent loads, improving line efficiency and reducing the need for parallel equipment. Application: Medium-size automation cells, packaging lines, and CNC interfaces. Feature: Primary 230 V / Secondary 460Y/266 V with 60 Hz operation; Business Impact: Provides effective electrical isolation while matching common industrial drive voltages, enabling plug-and-play integration. Application: Motor drives, control panels, and distributed power architectures. Feature: Tap changes at +5% FCAN and -5% FCBN; Business Impact: Voltage tuning accommodates load changes and supply variances, reducing drive stress and startup transients. Application: Variable load profiles and facility power fluctuations. Feature: Aluminum windings and robust 914D frame; Business Impact: Lightweight yet durable construction improves thermal response and ease of installation; frame supports stable mounting in compact spaces. Application: Panel mounts, stand-alone transformers, and retrofit projects. Feature: Weathershield WS39 and 150°C rise rating; Business Impact: Enables outdoor or harsh-environment operation with reliable performance under elevated temperatures. Application: Outdoor electrical rooms, manufacturing plants with limited climate control. Feature: UL Listed certification; Business Impact: Provides safety validation for industrial deployments, simplifying procurement and compliance documentation. Application: Industrial automation, drives and distribution systems with rigorous safety requirements.
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FAQs
MD51E89 requires proper mounting in a ventilated enclosure or open frame with WS39 protection where outdoor or semi-outdoor conditions exist. Plan for 22 in depth, 39 in height and 29 in width, with access to the 230 V primary and 460Y/266 V secondary connections. Ensure clearance for cooling and easy access to the +5% and -5% taps. UL Listed status supports compliant installation.
MD51E89 is a three-phase, 60 Hz transformer rated at 51 kVA with a 230 V primary and a 460Y/266 V secondary. It features aluminum windings, a DT-3 dry-type design, a 150°C rise rating, and taps at +5% FCAN and -5% FCBN. The unit uses a 914D frame and weighs 480 lb, suitable for mid-size automation environments.
Yes. The 51 kVA, three-phase isolation transformer decouples motor drives from input disturbances, reducing trips and drive wear. With 230 V to 460Y/266 V compatibility, DT-3 ventilation, and WS39 protection, it supports reliable packaging line automation and reduces maintenance due to electrical transients.
MD51E89 carries UL Listed certification, indicating compliance with essential safety standards for industrial electrical equipment. This certification streamlines procurement, supports safer installation in factories and control rooms, and provides confidence in performance under typical North American utility conditions.
Installing the MD51E89 reduces drive faults caused by input disturbances, cuts downtime, and extends drive life through effective isolation and thermal management. Its robust construction (914D frame, WS39) and taps for voltage adjustment minimize maintenance needs, while UL listing simplifies compliance and procurement for long-term factory reliability.