Eaton MD34E89 Motor drive isolation transformer - UL Listed
Part Number: MD34E89
Quick Summary
Eaton MD34E89 motor drive isolation transformer delivers safe, reliable isolation for industrial motor drives in control panels. This addresses common pain points such as voltage transients, overheating, and downtime caused by mismatched protection and improper isolation. The design carries UL Listed safety certification for North American installations and leverages dry-type DT-3 construction with vented cooling to support continuous operation in demanding environments. With a 34 kVA rating, three-phase configuration, and a 230 V primary feeding a 460Y/266 V secondary, it enables compact, compliant drive isolation in modern automation architectures, delivering improved reliability and energy efficiency for critical production lines.
Product Information
Extended Description
MD34E89 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, 34 kVA, Al windings, Frame: 912B, uses WS38
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD34E89
UPC
786680330513
Product Length/Depth
16.5 in
Product Height
30 in
Product Width
23 in
Product Weight
310 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
912B
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
34 kVA
Weathershield
WS38
Commercial Distribution, Transformers, Volume 2, Tab 2
Eaton Specification Sheet - MD34E89
Selling Policy 25-000 - Distribution and Control Products and Services
Feature: 34 kVA three-phase performance with 60 Hz operation. Business Impact: Supports high-demand motor drives with robust isolation, reducing fault propagation and enabling predictable startup sequences. Application: Drive systems in manufacturing lines and packaging equipment where dependable power transfer is essential. Feature: Dry-type DT-3 construction with ventilated cooling. Business Impact: Improves heat dissipation and eliminates oil-based cooling risks, lowering maintenance needs and extending service life. Application: Indoor control panels and distribution cabinets in harsh industrial environments. Feature: Aluminum windings on a durable 912B frame. Business Impact: Offers lightweight yet rugged construction with steady thermal behavior, improving efficiency and serviceability. Application: Panel installs where weight reduction and reliability matter. Feature: Tap adjustments (+5% FCAN, -5% FCBN). Business Impact: Enables precise voltage tuning to sustain motor performance under varied loads, minimizing performance drift. Application: Facilities with fluctuating supply voltages or motor loading. Feature: WS38 weathershield compatibility and ventilated enclosure design. Business Impact: Provides protection against dust and moisture ingress, enabling installation in semi-enclosed spaces and outdoor-rated panels. Application: Outdoor or partially protected switchgear closets. Feature: 230 V primary and 460Y/266 V secondary with a 34 kVA rating. Business Impact: Supports standard industry voltages for motor drives while delivering clean, isolated output to reduce EMI and transients. Application: Control centers and drive rooms in batch processing, conveyors, and automation lines. Feature: 150°C rise temperature rating with aluminum windings. Business Impact: Maintains performance under elevated operating temperatures, increasing uptime in hot environments. Application: Environments with limited cooling or elevated ambient temperatures.
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FAQs
MD34E89 is a dry-type, three-phase transformer designed for drive isolation in control panels and distribution cabinets. With a 230 V primary and 460Y/266 V secondary, it fits typical industrial panel architectures and can be mounted within ventilated enclosures using WS38 protection. Ensure adequate clearance for heat dissipation and secure mounting to 912B frames to maintain performance and safety.
Key specs include 34 kVA rating, three-phase configuration, 60 Hz frequency, primary 230 V, secondary 460Y/266 V, aluminum windings, DT-3 design, and 150°C rise. It features taps at +5% and -5% for voltage tuning, a 912B frame, and an overall footprint of 16.5 in depth, 30 in height, and 23 in width. These specs support reliable drive isolation in demanding environments.
Yes. The MD34E89 is specifically designed as a drive isolation transformer for motor drives, delivering clean, isolated power to protect drives from line disturbances. Its ventilated dry-type construction minimizes maintenance, while the WS38 weather shield compatibility enables installation in semi-protected areas. The +5%/−5% taps help maintain drive performance under varying line conditions.
The MD34E89 carries UL Listed certification, reflecting conformance to recognized electrical safety standards for North American installations. This helps reduce compliance risk in panel builds and supports vendor qualification processes. Always verify project-specific certifications required by your facility and region to ensure full regulatory alignment.
The MD34E89 can lower total cost of ownership by reducing downtime due to voltage transients and improving drive reliability. Its robust, vented dry-type design minimizes maintenance compared to oil-filled units, while its modular frame and compatibility with WS38 shield streamline installation. Warranty terms (one year from installation or eighteen months from shipment) provide added business reassurance.