Eaton MD440E88 Motor drive isolation transformer - UL Listed
Part Number: MD440E88
Quick Summary
MD440E88 motor drive isolation transformer delivers isolated power for drive systems in industrial automation and manufacturing equipment. Engineers often struggle with voltage fluctuations, startup transients, and the challenge of finding a space-efficient, reliable dry-type solution. Key certifications include UL Listed, with CE and IP considerations depending on regional requirements, ensuring electrical safety and environmental durability. This combination of isolation, 60 Hz three-phase performance, and a robust 440 kVA rating translates to improved uptime, reduced insulation stress, and easier integration with WS35 weather protection in harsh industrial environments. By pairing this transformer with compatible Eaton motor drives, you gain predictable performance and long-term cost savings through lower maintenance and safer operation.
Product Information
Extended Description
MD440E88 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: 230Y/133V, 150°C, 440 kVA, Al windings, Frame: 919E, uses WS35
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD440E88
UPC
786680330346
Product Length/Depth
36.23 in
Product Height
75 in
Product Width
44.2 in
Product Weight
2566 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
919E
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
230Y/133 V
Temperature rise
150 °C rise
Volt ampere rating
440 kVA
Weathershield
WS35
Ventilated, dry-type distribution design (DT-3) provides efficient heat dissipation and a compact footprint, enabling installation in tighter machine layouts. This reduces cooling requirements and improves reliability under continuous operation in motor drive applications. In practice, plant engineers can deploy this transformer close to drive cabinets to minimize cable length and voltage drop while maintaining thermal margins. Voltage taps offer +/- 5% adjustment to compensate for supply variations, helping maintain drive voltage within tolerance and protect sensitive electronics. For installations with delta primary and wye secondary configurations, the MD440E88 supports stable operation across load swings while preserving energy efficiency. Aluminum windings and a robust 150 °C rise specification under a 60 Hz three-phase rating ensure dependable performance in demanding environments. The 919E frame provides compatibility with Eaton's standard mounting and enclosure options, simplifying replacement and retrofit projects. UL Listed certification confirms electrical safety compliance, while the Eaton warranty covers one year from installation or eighteen months from shipment, whichever occurs first, reducing risk and supporting long-term TCO in mission-critical drive systems. WS35 weather-shield compatibility enhances outdoor and harsh indoor installations, protecting windings and ensuring stable voltages in factory, outdoor, or rain-prone environments.
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FAQs
Plan for a ventilated, dry-type transformer installation in a location that allows adequate airflow around the DT-3 core. Ensure clearance for the 919E frame and WS35 weather shield if mounting outdoors. Confirm Delta 230 V primary to 230Y/133 V secondary configuration and account for the +/- 5% tap adjustments to maintain drive voltage accuracy.
MD440E88 supports a 440 kVA volt-ampere rating, 60 Hz frequency, and three-phase operation with primary 230 V and secondary 230Y/133 V. It features aluminum windings, a 150 °C rise rating, and DT-3 design for reliable cooling in demanding drive installations, enabling stable operation under load transients common in motor drives.
Yes. The WS35 weather shield is specified for this unit, and the 919E frame is designed to align with Eaton’s enclosure and mounting standards. This compatibility simplifies retrofit, outdoor installations, and predictable integration with existing drive cabinets and protection enclosures.
MD440E88 carries UL Listed certification, indicating compliance with recognized safety standards for electrical equipment. Regional requirements may also necessitate CE marking or additional IP ratings depending on the market. Confirm local regulations and facilities standards to ensure full regulatory alignment for your installation.
The MD440E88 delivers improved uptime through isolation that mitigates drive transients and voltage variations, reducing component wear. The dry-type, ventilated design minimizes cooling needs, and the WS35 enclosure supports lower maintenance in outdoor or harsh environments. The warranty (one year from installation or 18 months from shipment) further lowers risk and supports long-term total cost of ownership.