Eaton MD40E85 Motor drive isolation transformer - UL Listed
Part Number: MD40E85
Quick Summary
Eaton MD40E85 motor drive isolation transformer enables protected, efficient power transfer in three-phase drive systems. Machinery downtime and drive faults are costly in automation lines; this unit isolates drive circuits to enhance safety and reliability. UL Listed certification guarantees safety compliance, with the DT-3 dry-type design and aluminum windings delivering robust performance in harsh industrial environments. It supports a 208 V primary and a 230Y/133 V secondary, enabling scalable motor control and simplified panel layouts for mid-size automation projects. With 40 kVA capacity, it accommodates a range of motor loads while maintaining voltage stability under load transients. The ventilated construction improves cooling in enclosure-rich environments, reducing thermal stress on windings and extending life. This combination delivers not only immediate safety benefits but also long-term operational savings for OEMs and maintenance teams.
Product Information
Extended Description
MD40E85 Eaton: Drive Isolation Transformer, Ventilated, Dry Type Distribution, DT-3, Three-phase, PV: 208V, Taps: 1 at +5% FCAN, 1 at -5% FCBN, SV: 230Y/133V, 150°C, 40 kVA, Al windings, Frame: 912B, uses WS38
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD40E85
UPC
786680001253
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
208 V
Secondary Voltage
230Y/133 V
Temperature rise
150 °C rise
Volt ampere rating
40 kVA
Weathershield
WS38
40 kVA rating delivers robust capacity for mid-size motor drives, enabling reliable performance in conveyors, machine tools, and packaging lines while minimizing the need for oversized transformers. This translates to lower capital cost and simplified panel layouts, improving overall system efficiency and future scalability. The DT-3 dry-type design provides lower fire risk and easier installation in indoor control panels, reducing lifecycle risk and maintenance overhead. Ventilated construction with WS38 weather-shield compatibility enhances cooling in hot or crowded industrial environments, supporting consistent drive performance and longer service life. Aluminum windings offer corrosion resistance and durable electrical conductivity, contributing to longer interval maintenance and reduced replacement costs in harsh plant conditions. Tap changes at +5% and -5% FCAN/FCBN support voltage regulation under varying loads, preserving motor performance and protecting sensitive drives. The 60 Hz, three-phase configuration aligns with standard industrial power, streamlining procurement and installation while ensuring compatibility with a wide range of drive systems.
Get a Quick Quote for a Eaton MD40E85
Chat with us on WhatsApp - fast responses guaranteed
Need to speak with someone? We'll call you back within 2 hours during business hours
Interested in Eaton MD40E85?
Enquire Now
FAQs
The MD40E85 is a three-phase, dry-type transformer designed for indoor control panels. Installation should accommodate its 16.5 in depth, 23 in width, and 30 in height footprint, with proper venting and clearance for WS38 protection. Connect primary to 208 V supply and secondary to 230Y/133 V driven equipment, using the +5% and -5% taps to tune voltage under load. Ensure secure mounting on the 912B frame and verify UL Listed compliance in your region.
Key specs include a 40 kVA rating, 60 Hz frequency, three-phase operation, 208 V primary, and 230Y/133 V secondary. Voltage taps provide ±5% regulation, supporting stable motor voltage during transients. With aluminum windings and a 150 °C rise rating, the unit balances performance with thermal resilience, enabling reliable operation in typical factory drives and machine tool applications.
Yes. The MD40E85 carries UL Listed certification, aligning with recognized safety standards for industrial control equipment. It’s designed for dry-type distribution and drive isolation in indoor environments. Always confirm regional regulatory requirements (such as CE) for specific installations, but UL Listed status provides a solid baseline for safety and compliance in many markets.
The 40 kVA dry-type transformer reduces downtime risks by isolating drive circuitry, improving motor reliability and protecting drives from transients. Aluminum windings and a ventilated WS38 design lower thermal stress and maintenance costs, while the durable DT-3 construction supports long service life in harsh plants. The result is lower replacement costs, fewer panel interventions, and a shorter payback period for automation investments.
Plan for WS38 weathershield compatibility and proper ventilation around the vented DT-3 unit. The MD40E85 uses a 912B frame and a coil of aluminum windings with 16.5 in depth clearance. Prepare for taps at +5% FCAN and -5% FCBN to manage voltage under load, and ensure the panel design supports 208 V to 230Y/133 V secondary configurations in a three-phase 60 Hz system.