Eaton MD51E99NVSS Motor drive isolation transformer - UL
Part Number: MD51E99NVSS
Quick Summary
MD51E99NVSS motor drive isolation transformer delivers clean, isolated power for three-phase motor drives in manufacturing and processing environments. This design minimizes control voltage noise, spikes, and transients that can jeopardize VFD performance and equipment longevity. UL Listed certification helps support safety and compliance in industrial facilities, while the DT-3 ventilated dry-type construction supports demanding cooling needs. The aluminum-wound coils and 150°C temperature rise are engineered for reliability in compact spaces, with 51 kVA rating and taps at +5% and -5% to accommodate voltage variation. In practice, this transformer reduces downtime, improves drive efficiency, and aids in standardizing power distribution for critical loads while aligning with Eaton’s warranty and service ecosystem.
Product Information
Extended Description
MD51E99NVSS 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: 480 delta, 150°C, 51 kVA, Al windings, Frame: 916AN
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD51E99NVSS
UPC
786680060885
Product Length/Depth
23.42 in
Product Height
46.58 in
Product Width
28.22 in
Product Weight
803 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
Catalog Notes
Totally enclosed non-ventilated DS-3 or DT-3, Grade 304 stainless steel enclosure (does not imply a NEMA 4X rating)
Coil material
Aluminum
Design
DT-3
Frame
916AN
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
480 V
Temperature rise
150 °C rise
Volt ampere rating
51 kVA
Feature: Drive isolation with ventilated, dry-type DT-3 construction → Business Impact: minimizes electrical noise, spikes, and transients that can disrupt motor drives → Application: ideal for VFD-driven conveyors, pumps, and processing lines in harsh industrial environments. Feature: 51 kVA rating with 480 V primary/secondary → Business Impact: supports multiple motors and drives from a single source, reducing panel clutter and energy losses → Application: plant-wide motor drive distribution with streamlined wiring. Feature: Taps at +5% FCAN and -5% FCBN → Business Impact: compensates for supply fluctuations, maintaining drive performance and protection margins → Application: facilities with variable feeder voltages or long feeders. Feature: Aluminum windings with 150°C rise → Business Impact: robust thermal performance and corrosion resistance, extending service life in demanding environments → Application: high-duty cycle installations in manufacturing lines. Feature: Frame 916AN with 46.58 in height and 28.22 in width → Business Impact: enables compact installation in standard electrical or equipment cabinets → Application: retrofit and new-build control panels with limited rack space. Feature: UL Listed certifications → Business Impact: simplifies procurement and compliance documentation for regulated industries → Application: safe, auditable installations in industrial facilities. Feature: Ventilated enclosure with DS-3/DT-3 notes → Business Impact: supports efficient cooling and predictable maintenance planning → Application: dry-type distribution transformers in ventilated enclosures for easy serviceability.
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FAQs
MD51E99NVSS is a three-phase dry-type transformer designed for ventilated DT-3 or DS-3 enclosures. Plan for adequate clearance around the 916AN frame, account for 46.58 in height, 28.22 in width, and 23.42 in depth, and ensure UL Listed compliance. Use proper mounting hardware, maintain ventilation, and provide suitable incoming power connections at 480 V delta.
The transformer provides drive isolation and voltage conditioning for sensitive VFD inputs, reducing mains spikes and electrical noise that can affect motor control. Its dry-type, ventilated construction supports reliable cooling in cabinet environments, while the 51 kVA rating covers typical motor drive loads in manufacturing lines.
Primary voltage is 480 V and secondary voltage is 480 V (delta), with taps at +5% FCAN and -5% FCBN to accommodate small supply fluctuations. This setup helps maintain stable drive voltage and performance across variable input conditions typical in industrial facilities.
Yes, the MD51E99NVSS is UL Listed, providing recognized safety certification for electrical equipment. This certification supports safer procurement and regulatory compliance in industrial environments, particularly when integrating with motor drives and distribution panels.
Expect reduced varnish and insulation stress on drive electronics due to improved isolation, leading to lower downtime and fewer drive faults. The 51 kVA capacity supports multiple drives from a single source, enabling fewer components and simpler maintenance. With UL Listing and Eaton support, operators can realize a faster ROI through improved reliability and easier procurement.