Eaton MD440E90 Motor Drive Isolation Transformer - UL Listed
Part Number: MD440E90
Quick Summary
MD440E90 motor drive isolation transformer delivers clean, isolated power for motor drive systems in demanding industrial environments. Engineers frequently battle drive faults from transients and grounding differences; this transformer provides robust isolation and stable voltage to minimize unplanned downtime. UL Listed for safety, the unit uses a dry-type DT-3 design with ventilated construction to withstand continuous operation in harsh facilities. With 230 V primary and 575Y/332 V secondary, plus +5% and -5% taps, it supports flexible drive configurations and reduces wiring complexity. WS35 weather shield enhances field durability, while aluminum windings help efficiency in 440 kVA applications. This combination supports scalable automation projects and reduces installation risk, delivering reliable power interfaces for modern drive applications.
Product Information
Extended Description
MD440E90 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: 575Y/332V, 150°C, 440 kVA, Al windings, Frame: 919E, uses WS35
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD440E90
UPC
786680331145
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
575Y/332 V
Temperature rise
150 °C rise
Volt ampere rating
440 kVA
Weathershield
WS35
Feature: Dry Type DT-3 distribution transformer construction. Business Impact: Safer, maintenance-friendly operation with reduced oil handling and fire risk. Application: Ideal for indoor motor drive rooms where reliability and compliance matter. Feature: Ventilated enclosure with WS35. Business Impact: Enhanced air flow and heat dissipation, enabling sustained 440 kVA loads in hot environments. Application: Large drives and distribution feeders in harsh plant floors. Feature: Aluminum windings. Business Impact: Lower weight for easier handling and improved energy efficiency, reducing lifecycle costs. Application: Retrofit projects where weight and thermal performance matter. Feature: 230 V primary with 575Y/332 V secondary and taps at +/-5%. Business Impact: Flexible voltage regulation and improved compatibility with 3-phase motor drives, reducing wiring and configuration time. Application: New installations and machine upgrades requiring precise drive isolation. Feature: Frame 919E and DT-3 design. Business Impact: Compact, room-friendly footprint with proven mechanical compatibility for equipment racks. Application: Automation panels and switchgear assemblies. Feature: 60 Hz, three-phase operation. Business Impact: Ensures alignment with standard industrial power systems, minimizing integration risk. Application: Plant-wide motor control centers and drive assemblies. Feature: 150°C rise rating. Business Impact: Higher thermal margin for peak loads, improving reliability during startup transients. Application: High-duty-cycle drive systems in continuous operation.
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FAQs
Install MD440E90 in a well-ventilated indoor area to accommodate its ventilated dry-type design. Use the 919E frame mounting and ensure adequate clearance for heat dissipation. Confirm 230 V three-phase supply and configure the +5% / -5% taps as per system voltage requirements to maintain stable drive performance.
Key specs include a 440 kVA rating, 230 V primary, 575Y/332 V secondary, 60 Hz, three-phase operation, aluminum windings, and a 150 °C rise. These enable strong isolation, voltage regulation for motor drives, and robust performance under startup transients common in automation systems.
Yes. The MD440E90 is purpose-built as a drive isolation transformer with a DT-3 dry-type design, ventilated enclosure, and 440 kVA capacity, making it well-suited for high-demand motor start scenarios where isolation and voltage stability are critical.
The MD440E90 carries UL Listed certification, which supports safety compliance in North American installations. For CE, IP ratings, or SIL requirements, verify local regulatory demands and supplier documentation, as those statuses are not specified in the provided data.
Consider the unit’s heavy mass (2566 lb) and ventilated, dry-type design for installation planning and cooling. The one-year warranty (or 18 months from shipment) helps mitigate initial risk. A reliable 440 kVA isolation transformer can reduce drive faults, improve uptime, and lower maintenance costs over its lifecycle when paired with proper ventilation and panel integration.