Eaton MD330E91 Motor Drive Isolation Ventilated Transformer - UL Listed
Part Number: MD330E91
Quick Summary
Eaton MD330E91 motor drive isolation ventilated transformer powers and protects drive systems in industrial automation. Startup surges and transient voltages can damage drives and trigger unplanned downtime, so isolation helps maintain uptime and extend equipment life. UL Listed safety certification accompanies a DT-3 dry-type design optimized for three-phase distribution environments. Built for high power with a 330 kVA rating, aluminum windings, and vented cooling in a DT-3 dry-type design, it integrates with standard motor control centers to protect equipment and reduce energy losses.
Product Information
Extended Description
MD330E91 Eaton: Drive Isolation Transformer, Ventilated, Dry Type Distribution, DT-3, Three-phase, PV: 460 delta, Taps: 1 at +5% FCAN, 1 at -5% FCBN, SV: 230Y/133V, 150°C, 330 kVA, Al windings, Frame: 919E, uses WS35
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD330E91
UPC
786680331534
Product Length/Depth
36.23 in
Product Height
75 in
Product Width
44.2 in
Product Weight
2234 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
460 V
Secondary Voltage
230Y/133 V
Temperature rise
150 °C rise
Volt ampere rating
330 kVA
Weathershield
WS35
Feature → Business Impact → Application: Dry Type Distribution, Drive Isolation Transformer improves safety by eliminating direct interconnection with potentially harmful line disturbances, reducing fault propagation into sensitive motor drives. This translates to greater uptime on conveyors and packaging lines, with safer maintenance windows; Application: industrial automation and manufacturing floors seeking reliable drive protection. Feature → Business Impact → Application: DT-3 Design with Frame 919E provides a rugged, standard-mount solution that simplifies installation in existing enclosures and reduces retrofit complexity. This enables faster project completion and consistent performance in harsh environments; Application: warehouses and process industries using large motor drives. Feature → Business Impact → Application: Primary 460 V delta and Secondary 230Y/133 V deliver flexible, ride-through power for three-phase drives, enabling seamless voltage conversion with minimal brownouts; Application: control cabinets and MCCs requiring dependable drive isolation. Feature → Business Impact → Application: Tap size options at +5% FCAN and -5% FCBN allow precise voltage regulation under load swings, improving motor performance and reducing wear; Application: critical process lines with variable loads. Feature → Business Impact → Application: 330 kVA rating supports multiple drives or high-inrush applications, reducing the need for oversized systems and lowering total installed cost; Application: high-power manufacturing lines. Feature → Business Impact → Application: WS35 Weathershield and ventilated cooling maximize reliability in exposed or semi-enclosed spaces, extending service intervals and lowering maintenance costs; Application: outdoor or semi-open transformer installations in harsh environments.
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FAQs
MD330E91 supports a three-phase 460 V primary with a 230Y/133 V secondary configuration, plus taps at +5% and -5%. The unit uses a 919E frame and is designed for compatibility with standard motor control centers, enabling straightforward alignment with existing busbars, enclosures, and wiring schemes while accommodating lightweight installation planning despite its heavy weight.
As a drive isolation transformer, MD330E91 progressively attenuates inrush and transients going to motor drives, reducing peak currents and voltage spikes. Its ventilated dry-type design maintains temperature rise within 150 °C, safeguarding insulation and extending drive life, which translates into fewer maintenance interruptions and improved process consistency.
Yes. The MD330E91 leverages aluminum windings and a WS35 Weathershield, along with a ventilated dry-type construction, to withstand demanding environments. This makes it well-suited for manufacturing floors, outdoor or semi-exposed installations, and areas with dust, moisture, or temperature fluctuations while maintaining electrical safety and performance.
MD330E91 carries UL Listed certification, affirming compliance with recognized safety standards for electrical equipment. This certification supports safer operation in industrial facilities and simplifies supplier qualification for projects requiring approved electrical components.
The MD330E91 reduces downtime by isolating drives from line disturbances, lowers inrush-related wear, and supports stable voltage delivery. The 330 kVA rating accommodates multiple drives, reducing equipment margins, while the robust DT-3 design and WS35 shielding extend service intervals and lower total cost of ownership over the asset lifecycle.