Eaton MD330E73 Drive isolation transformer - UL Listed
Part Number: MD330E73
Quick Summary
MD330E73 motor drive isolation transformer delivers clean, isolated power for industrial drive systems and motor control panels. Many plants struggle with voltage spikes, harmonics, and heat in motor drives that erode uptime and raise maintenance costs. Certifications include UL Listed, and the dry-type DT-3 design supports safer indoor installation, while robust insulation handles demanding environments. This solution is designed to minimize drive-related faults, while providing easy installation compatibility with WS35 protection and standard 60 Hz power. By combining rugged construction with precise voltage taps and a large kVA rating, it delivers reliability and a strong return on investment for automated production lines. Additionally, its aluminum windings and high-temperature insulation enable longer service intervals.
Product Information
Extended Description
MD330E73 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: 460 delta, 150°C, 330 kVA, Al windings, Frame: 919, uses WS35
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD330E73
UPC
786680047909
Product Length/Depth
36.23 in
Product Height
75 in
Product Width
44.2 in
Product Weight
2326 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
919
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
460 V
Temperature rise
150 °C rise
Volt ampere rating
330 kVA
Weathershield
WS35
Commercial Distribution, Transformers, Volume 2, Tab 2
Eaton Specification Sheet - MD330E73
Selling Policy 25-000 - Distribution and Control Products and Services
Feature: Dry-type Distribution, DT-3 design with ventilated construction. Business Impact: Reduces risk of oil leaks and simplifies cooling requirements, lowering maintenance costs. Application: Indoor drive rooms and control panels where ventilation is available. Feature: Three-phase 460 V primary and 460 V secondary with 60 Hz operation. Business Impact: Fits standard industrial power systems, enabling plug-and-play integration with existing motor drives. Application: Variable-frequency drives and motor control centers. Feature: 330 kVA VA rating with frame 919 and WS35 protection. Business Impact: Handles large motor loads with reliable isolation, improving uptime and protecting downstream drives. Application: Heavy automation lines and press systems. Feature: Aluminum windings and 150°C rise insulation. Business Impact: Durable in high-temperature environments, reducing unexpected outages and extending service life. Application: Factory floors with restricted cooling or high ambient heat. Feature: Tap options +5% and -5% FCAN/FCBN. Business Impact: Provides voltage regulation to compensate supply variations, minimizing voltage stress on drives. Application: Plants with irregular supply voltage or motor start-up transients. Feature: UL Listed certification. Business Impact: Demonstrates safety compliance for industrial installations, facilitating regulatory approvals. Application: Any UL-required site or customer specification. Feature: WS35 Weathershield compatibility. Business Impact: Enables versatile installation in semi-exposed locations without compromising protection. Application: Outdoor-rated enclosures and harsh environments where climate ingress is a concern. Feature: 1-year warranty (or 18 months from shipment, whichever occurs first). Business Impact: Reduces total cost of ownership with predictable support. Application: Maintenance planning and procurement decisions for capital projects.
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FAQs
MD330E73 is a large dry-type unit intended for indoor installation in drive rooms or control panels. Plan for a footprint of roughly 36.23 in deep, 75 in tall, and 44.2 in wide, with a total weight of about 2326 lb. Provide adequate ventilation, mounting clearance, and WS35 protection if exposed; ensure correct tap selection (+5% / -5%).
Rated at 330 kVA with 60 Hz, three-phase operation, the transformer has a 460 V primary and 460 V secondary. Its DT-3 dry-type design with aluminum windings and a 150°C rise insulation supports high-temperature environments, while the 36.23 x 75 x 44.2 in frame 919 housing ensures robust isolation from drive transients. Tap adjustments (+5% / -5%) aid voltage regulation under varying supply conditions.
Yes. The MD330E73 uses the WS35 weather shield for indoor-to-outdoor capability, paired with the DT-3 dry-type distribution design for safe, ventilated operation. Aluminum windings and the sturdy frame 919 provide mechanical stability, while the 3-phase 460 V configuration aligns with common industrial drives. For exposed installations, ensure proper ventilation and enclosure protection.
The MD330E73 is UL Listed, confirming compliance with safety standards for industrial transformers. Data does not specify additional certifications such as CE or IP ratings. When sourcing for global projects, verify regional requirements and confirm any applicable certifications with Eaton for your market.
The dry-type construction minimizes oil-related maintenance and leakage risks, while the unit’s robust insulation supports longer service intervals in hot environments. A 1-year warranty (or 18 months from shipment) reduces risk for capital projects. Overall, improved uptime, reduced fault rates in drives, and compatibility with standard panels contribute to a favorable total cost of ownership.