Eaton MD330E94 Motor drive isolation transformer - UL
Part Number: MD330E94
Quick Summary
MD330E94 Eaton motor drive isolation transformer protects drive circuits in industrial automation applications. Engineers often battle voltage transients and EMI on VFD inputs that cause nuisance trips and downtime. UL Listed safety certification provides essential compliance and reliability for demanding environments. The dry-type DT-3 design with aluminum windings and WS35 weather shield supports safe installation in control rooms or outdoor enclosures, while the 330 kVA rating meets typical motor drive loads. With a 575 V primary and 230Y/133 V secondary, plus +5%/−5% taps for voltage regulation, this transformer delivers stable power quality, helping facilities reduce maintenance costs and extend equipment life. In short, it blends robust protection with practical installation benefits for modern automation projects.
Product Information
Extended Description
MD330E94 Eaton: Drive Isolation Transformer, Ventilated, Dry Type Distribution, DT-3, Three-phase, PV: 575 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
MD330E94
UPC
786680339042
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
575 V
Secondary Voltage
230Y/133 V
Temperature rise
150 °C rise
Volt ampere rating
330 kVA
Weathershield
WS35
Commercial Distribution, Transformers, Volume 2, Tab 2
Eaton Specification Sheet - MD330E94
Selling Policy 25-000 - Distribution and Control Products and Services
Feature: Dry-type distribution transformer with aluminum windings (DT-3, frame 919E) provides inherent safety and easier maintenance. Business Impact: Reduces risk of oil leaks, simplifies cooling, and lowers lifecycle costs for plant-wide drive installations. Application: Ideal for motor drive suites and control panels where reliable cooling and safe operation matter. Feature: Ventilated, dry-type construction supports higher temperature rise (150 °C) without oil, enabling safer operation in confined spaces. Business Impact: Improves uptime by sustaining continuous operation under peak loads, decreasing unplanned downtime. Application: Suitable for harsh factory environments and retrofit projects where space is at a premium. Feature: Tap size options (+5% FCAN, -5% FCBN) delivers voltage regulation to match local utility or facility distribution. Business Impact: Reduces voltage sensitivity of VFDs, improving performance and extending equipment life. Application: Critical for sites with fluctuating supply quality or long feeder runs. Feature: Weathershield WS35 and overall rugged build enable outdoor or harsh-environment deployments. Business Impact: Extends installation flexibility and protects from weather-related degradation, lowering enclosure requirements. Application: Outdoor transformer enclosures or exposed installations in industrial facilities. Feature: 330 kVA, three-phase, 575 V to 230Y/133 V with 60 Hz operation offers robust capacity for motor drives. Business Impact: Supports common automation loads with reliable transient suppression and smoother motor startup. Application: Motor control centers, drives panels, and distribution gear in manufacturing plants. Feature: UL Listed certification provides essential safety compliance for procurement and installation. Business Impact: Reduces vendor risk and accelerates project approvals, ensuring alignment with corporate safety standards. Application: Corporate-wide safety programs and regulated environments.
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FAQs
When installing the MD330E94, plan for a ventilated dry-type transformer footprint with adequate clearance for the 36.23 in depth, 44.2 in width, and 75 in height. Mount in a suitable enclosure or control room, ensure proper ventilation for the DT-3 design, and connect the 575 V delta primary and 230Y/133 V secondary per the nameplate. Use the +5% and -5% taps to fine-tune voltage as needed for stable drive operation.
The transformer provides drive isolation to suppress transients and dampen EMI entering VFDs, improving drive lifetime and reducing nuisance trips. Its dry-type construction eliminates oil-related risks, while the 330 kVA rating supports peak motor startup loads. With aluminum windings and a ventilated design, it delivers reliable performance in demanding automation environments.
Yes. The MD330E94 uses WS35 weather shielding and a ventilated dry-type DT-3 design, enabling safer outdoor or harsh-environment installations. This protection simplifies site planning for outdoor control houses and reduces enclosure requirements, while maintaining cooling and safety standards for continuous operation in plants and outdoor facilities.
The MD330E94 is UL Listed, providing essential safety certification and compliance for industrial installations. This certification supports procurement confidence and aligns with typical corporate safety programs, helping simplify compliance during audits and project approvals.
The unit measures 36.23 in long, 44.2 in wide, and 75 in high, and weighs about 2234 lb. This substantial footprint and weight influence crane, flooring, and rack placement during installation. However, the robust isolation, transient protection, and reliable 60 Hz performance translate to reduced downtime, lower maintenance costs, and a favorable total cost of ownership over the transformer’s lifecycle.