Eaton MD440E89 Motor drive isolation transformer - UL Listed
Part Number: MD440E89
Quick Summary
MD440E89 motor drive isolation transformer provides dry-type isolation for robust motor drives in industrial power distribution. Operators often struggle with voltage transients and equipment damage, but this transformer mitigates spikes, improves uptime, and simplifies maintenance. It carries UL Listed certification, supports 60 Hz three-phase operation, and delivers 440 kVA, aligning with safety and performance standards. Designed for DT-3 dry-type distribution and WS35 weather shield compatibility, it supports easy installation on standard frames and helps reduce lifecycle costs through efficient cooling and durable aluminum windings. For procurement teams, this means predictable performance, reduced spare parts, and clearer compliance documentation across projects.
Product Information
Extended Description
MD440E89 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, 440 kVA, Al windings, Frame: 919E, uses WS35
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD440E89
UPC
786680330742
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
460Y/266 V
Temperature rise
150 °C rise
Volt ampere rating
440 kVA
Weathershield
WS35
DT-3 dry-type distribution design with vented enclosure eliminates oil-based cooling and reduces fire risk, delivering safe operation in demanding environments. Business impact: lower maintenance costs, improved reliability, and extended asset life. Application: ideal for motor drives and distribution panels in manufacturing, mining, and process automation where space and safety are critical. The 440 kVA rating at 60 Hz with a 230 V primary and 460Y/266 V secondary provides ample headroom for large motors and drives, improving voltage stability and reducing startup transients. This translates to tighter process control, reduced equipment wear, and better overall plant efficiency. Tap sizes at +5% FCAN and -5% FCBN enable quick voltage matching during loading changes or motor startups, minimizing nuisance trips in variable speed drives. Aluminum windings and a 919E frame offer durability and robust thermal performance even under continuous operation. WS35 weather shield compatibility and vented design simplify installation in outdoor or harsh environments, helping facilities meet regulatory expectations with less customization. UL Listed certification reinforces safety and quality with customers, supporting procurement and compliance programs. These design choices collectively reduce downtime, extend service life, and lower life-cycle costs for industrial automation projects.
Get a Quick Quote for a Eaton MD440E89
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 MD440E89?
Enquire Now
FAQs
Begin by verifying system compatibility with the 230 V primary and 460Y/266 V secondary ratings, then align mounting to the 919E frame. Ensure DT-3 dry-type ventilation and WS35 weather shield accessories are in place. Use proper lugs and torque values, connect to a three-phase 60 Hz network, and utilize the +5% and -5% taps to tune voltage during startup. Confirm clearances for maintenance access and verify UL Listed compliance in your panel enclosure. Finally, document wiring diagrams and perform a light electrical test before commissioning.
Key specs include 440 kVA ratings, 60 Hz operation, three-phase design, 230 V primary, and 460Y/266 V secondary with +5%/−5% voltage taps. These features support large motor loads, stabilize voltage under transient conditions, and minimize drive reflections and EMI in VFD-driven applications. The ventilated dry-type construction reduces heat buildup, improves reliability, and enables faster service in demanding environments.
Yes, the MD440E89 is well-suited for motor drives in automation lines, providing clean, isolated power to VFDs and other sensitive loads. Its DT-3 dry-type design and UL Listed certification help ensure safety and compliance, while the WS35 weather shield and aluminum windings contribute to stable voltage, reduced EMI, and durable performance in harsh industrial environments.
The MD440E89 carries UL Listed certification, signaling conformance with recognized safety standards for electrical equipment. This certification simplifies regulatory approvals, improves supplier qualification, and supports audits for industrial facilities, OEMs, and system integrators. The transformer also adheres to 60 Hz three-phase standards and dry-type DT-3 construction, aligning with common electrical codes in manufacturing settings.
Engineers can expect reduced maintenance through a robust dry-type design that eliminates oil handling, lower downtime due to improved thermal performance, and longer service life from aluminum windings and a durable 919E frame. The UL Listed certification simplifies procurement and compliance, while the +5%/−5% taps enable quicker voltage tuning during commissioning, contributing to faster ROI in retrofit or new installs.