Eaton MD40E90 Motor drive isolation transformer - UL Listed
Part Number: MD40E90
Quick Summary
Eaton MD40E90 motor drive isolation transformer provides clean, isolated power for three-phase drive systems in industrial facilities. Vibration, electrical noise, and transient surges can disrupt motor control and uptime. This UL Listed unit leverages a DT-3 dry-type design with ventilated construction and a 150°C rise, delivering reliable performance in demanding environments. By integrating with standard motor drives, it supports improved uptime, tighter voltage control, and safer transients, helping engineers reduce maintenance costs and extend equipment life. This solution is designed for industrial automation environments where downtime is costly and reliability matters. It aligns with common procurement workflows by using the MD40E90 catalog number and UL Listing to simplify specs and compliance reviews.
Product Information
Extended Description
MD40E90 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: 575Y/332V, 150°C, 40 kVA, Al windings, Frame: 912B, uses WS38
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD40E90
UPC
786680330933
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
575Y/332 V
Temperature rise
150 °C rise
Volt ampere rating
40 kVA
Weathershield
WS38
MD40E90 delivers electrical isolation for motor drive systems, protecting sensitive drives from transients and EMI. The 40 kVA, three-phase unit supports VFDs and soft starters while reducing nuisance trips and improving process stability. Designed for industrial automation environments, it integrates with standard motor control architectures to simplify procurement and installation. Ventilated DT-3 dry-type construction enables reliable cooling in hot plant areas, reducing overheating risk and enabling longer service life. The 150°C rise rating provides a wide operating margin under peak loads, while aluminum windings offer lightweight durability and corrosion resistance. The WS38 weather shield option extends outdoor usability where enclosure filtration is limited. With a 230 V primary and 575Y/332 V secondary, MD40E90 matches common distribution schemes and minimizes voltage drop across feeders. The +5% and -5% taps enable on-site voltage compensation to counter supply fluctuations and improve VFD performance. Physical footprint measures 16.5 in length, 23 in width, and 30 in height with a 912B frame for compatibility with standard mounting rails and enclosures. Aluminum conductors contribute to a 310 lb weight, while UL Listed certification confirms safety compliance. This transformer is backed by Eaton's warranty policy (1 year from installation or 18 months from shipment) and a robust service ecosystem for field support.
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FAQs
When replacing or upgrading, verify a 230 V delta primary and 575Y/332 V secondary, 60 Hz operation, three-phase supply, and frame 912B. Ensure adequate clearance for ventilation, attach to a stable mounting surface, and plan for WS38 weather shield if outdoor mounting is required.
A 40 kVA rating provides headroom for motor starts and inrush, reducing overload risk and maintaining voltage stability under dynamic loads. This supports smoother VFD performance, minimizes nuisance trips, and enables higher throughput in production lines with demanding duty cycles.
Yes. The ventilated dry-type design supports outdoor or semi-outdoor installations, especially when paired with the WS38 weather shield option. Ensure proper enclosure, ventilation, and spacing to maintain cooling and safe operation in variable weather conditions.
The MD40E90 carries Eaton's warranty policy of one year from installation or eighteen months from shipment, whichever occurs first. Regular inspections, routine cleaning of cooling passages, and adherence to UL-listed safety practices help sustain reliability and prevent unexpected downtime.
Confirm 230 V primary, 575Y/332 V secondary, 60 Hz, and three-phase supply. Check taps (+5% FCAN, -5% FCBN), 40 kVA rating, aluminum windings, frame 912B, and ensure sufficient ventilation and mounting space for safe service and compliant installation.