Eaton MD330E89 Motor drive isolation ventilated transformer - UL Listed
Part Number: MD330E89
Quick Summary
MD330E89 motor drive isolation ventilated transformer delivers clean, isolated power for drive systems in industrial plants. Engineers often struggle with voltage spikes, heat buildup, and insulation wear when feeding VFDs from incoming power. UL Listed certification, the DT-3 dry-type design, and a 330 kVA rating reinforce safety, reliability, and scalability in demanding applications. By pairing rugged aluminum windings with a ventilated cooling method, this transformer helps maintain uptime, reduces maintenance cycles, and supports seamless integration with existing control architectures. In practice, plant teams gain predictable voltage transfer and better protection for drives while keeping total cost of ownership in check.
Product Information
Extended Description
MD330E89 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, 330 kVA, Al windings, Frame: 919, uses WS35
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD330E89
UPC
786680330735
Product Length/Depth
36.23 in
Product Height
75 in
Product Width
44.2 in
Product Weight
2400 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
230 V
Secondary Voltage
460Y/266 V
Temperature rise
150 °C rise
Volt ampere rating
330 kVA
Weathershield
WS35
Feature: DT-3 dry-type design and ventilated construction. Business Impact: Reduces fire risk and simplifies cooling in enclosed switchgear, increasing equipment longevity. Application: Drive isolation for VFD-fed motors in compact machine cells. Feature: 330 kVA rating with 60 Hz three-phase performance; Primary 230 V; Secondary 460Y/266 V. Business Impact: Supports high-power drive systems without transformer stacking, lowering footprint and installation costs. Application: Industrial automation lines and packaging equipment. Feature: Tap size +5% FCAN and -5% FCBN. Business Impact: Maintains output voltage under load and supply fluctuations, reducing drive faults. Application: Plants with variable utility conditions. Feature: Weathershield WS35, aluminum windings, and frame 919. Business Impact: Enhances outdoor durability and corrosion resistance while minimizing weight and shipping costs. Application: Outdoor installations or harsh manufacturing environments. Feature: Warranty and certifications (UL Listed). Business Impact: Provides risk reduction and clear compliance framework, supporting maintenance planning and service contracts. Application: Enterprise-scale deployments seeking predictable service life and support.
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FAQs
Install the three-phase 230 V primary and connect to the 460Y/266 V secondary as specified. Ensure the unit is mounted within the DT-3 ventilated enclosure and, if outdoors, use the WS35 weather shield. Utilize the taps at +5% FCAN and -5% FCBN to compensate for voltage variations. Follow lockout/tagout procedures and verify UL Listed compliance.
The transformer supports 60 Hz operation in three-phase systems with a 330 kVA VA rating. Its dry-type, ventilated design minimizes heat buildup, while aluminum windings and frame 919 deliver reliable geometry for steady voltage transfer from 230 V primary to 460Y/266 V secondary, protecting sensitive drive electronics from transients.
Yes. The WS35 weather shield option provides protection for outdoor or harsh industrial environments. Combined with the ventilated dry-type construction, aluminum windings, and robust frame, the MD330E89 maintains performance and reliability where cooling and environmental exposure are concerns.
The MD330E89 is UL Listed, signaling compliance with essential safety and reliability standards for electrical equipment used in industrial settings. This certification helps with regulatory acceptance, contractor qualifications, and reduces project risk when integrating with motor drives and distribution systems.
With a 1-year warranty from installation (or 18 months from shipment) and UL safety certification, maintenance planning becomes predictable and service contracts are easier to justify. The dry-type design and robust frame reduce oil-related concerns and scheduled maintenance, while the high 330 kVA rating supports fewer transformer assets for large drive installations, lowering lifecycle costs.