Eaton MD51D79ES Drive Isolation Transformer - UL Listed
Part Number: MD51D79ES
Quick Summary
Eaton MD51D79ES is a drive isolation ventilated transformer for three-phase motor drives in industrial automation environments. Start-up surges and voltage transients often compromise drive performance; this unit provides robust isolation and cooling to mitigate those issues. UL Listed certification underpins safety and reliability in demanding installations, while its DT-3 dry-type design delivers rugged, low-maintenance operation. With a 51 kVA rating and primary 480 V feeding a 480Y/277 V secondary, it integrates cleanly into standard motor drive panels. Built for compatibility with WS39 weather shields and a 914D frame, it supports reliable, serviceable deployments in control rooms and machine enclosures, helping reduce downtime and extend equipment life.
Product Information
Extended Description
MD51D79ES Eaton: Drive Isolation Transformer, Ventilated, Dry Type Distribution, DT-3, Three-phase, PV: 480 delta, Taps: 1 at +5% FCAN, 1 at -5% FCBN, SV: 480Y/277, 150°C, 51 kVA, Al windings, Elec. Shield, Frame: 914D, uses WS39
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD51D79ES
UPC
786680064814
Product Length/Depth
22 in
Product Height
39 in
Product Width
29 in
Product Weight
491 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
480 V
Secondary Voltage
480Y/277 V
Temperature rise
150 °C rise
Volt ampere rating
51 kVA
Special features
Electrostatically shielded
Weathershield
WS39
Ventilated dry-type construction improves cooling for busy motor drive panels, reducing overheating and derating. The DT-3 design supports efficient heat removal in enclosed spaces, translating into longer component life and fewer unplanned outages in manufacturing lines. The MD51D79ES delivers a 51 kVA rating with a 480 V primary and a 480Y/277 V secondary, enabling high-load motor drives while isolating sensitive control electronics from line disturbances, which reduces drive faults and maintenance costs. Field-tunable +5% FCAN and -5% FCBN taps let sites compensate voltage swings without field rewiring, ensuring consistent motor performance. Aluminum windings plus an electrostatic shield provide EMI suppression and durable operation in harsh environments, while WS39 weather shield compatibility broadens installation options. Frame 914D compatibility simplifies mounting in standard enclosures, and UL Listed status supports safe procurement with a strong warranty backing.
Get a Quick Quote for a Eaton MD51D79ES
Chat with us on WhatsApp - fast responses guaranteed
Need to speak with someone? We'll call you back within 2 hours during business hours
Interested in Eaton MD51D79ES?
Enquire Now
FAQs
Install MD51D79ES in a well-ventilated enclosure sized for a 51 kVA transformer. Allow for adequate clearance around the unit to promote airflow, and mount on a rigid, vibration-tolerant base that aligns with the 914D frame. Use proper lugs and shields for aluminum windings, connect to a properly rated 480 V supply and a 480Y/277 V secondary circuit, and follow local electrical codes. The DT-3 dry-type construction simplifies cooling and reduces maintenance needs in harsh industrial environments.
MD51D79ES is designed specifically for three-phase motor drive systems, providing isolation between the 480 V primary and the 480Y/277 V secondary. This configuration minimizes transients reaching sensitive drives, improves protection against voltage sags, and supports stable motor performance in automation plants. The 51 kVA rating accommodates typical drive loads, while aluminum windings and electrostatic shielding enhance reliability and EMI control.
Yes. The MD51D79ES includes two primary-tap options: +5% FCAN and -5% FCBN. These taps allow on-site voltage compensation to counteract fluctuations from incoming power or long cable runs, maintaining consistent secondary voltage and protecting connected drives from overvoltage or undervoltage conditions. This capability reduces drive wear, minimizes nuisance tripping, and improves overall system stability.
MD51D79ES carries UL Listed certification, supporting electrical safety and code compliance in industrial installations. The dry-type, ventilated DT-3 design also aligns with common industry practices for safe operation in control rooms and enclosures. When planning procurement, confirm compatibility with local electrical codes and any customer-specific safety standards that apply to motor drive isolation components.
The MD51D79ES uses a dry-type, ventilated design with electrostatic shielding, which typically requires less routine maintenance than oil-filled units. Expect reduced cooling-related downtime due to improved airflow, fewer transformer-related faults, and extended drive life from superior isolation. The 51 kVA rating supports demanding loads, while the robust 914D frame and WS39 compatibility offer flexible installation in standard enclosures, contributing to lower total cost of ownership.