Eaton MD40E93 Motor drive isolation transformer - UL Listed
Part Number: MD40E93
Quick Summary
Eaton MD40E93 motor drive isolation transformer delivers clean, isolated power for drive systems across industrial facilities. This solution helps prevent control-system disturbances, voltage spikes, and nuisance faults that slow down production and increase downtime. UL Listed with a DT-3 design and WS38 weather shield, it’s built for reliable operation in demanding environments. The device supports a 60 Hz, three-phase footprint with a 40 kVA rating, primary 460 V and secondary 575Y/332 V, enabling safe integration with modern motor drives and distributed control architectures. By combining aluminum windings and a rugged frame, it lowers maintenance costs while improving uptime, electrical noise immunity, and overall system performance for OEMs and end users alike.
Product Information
Extended Description
MD40E93 Eaton: Drive Isolation Transformer, Ventilated, Dry Type Distribution, DT-3, Three-phase, PV: 460 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
MD40E93
UPC
786680332135
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
460 V
Secondary Voltage
575Y/332 V
Temperature rise
150 °C rise
Volt ampere rating
40 kVA
Weathershield
WS38
Commercial Distribution, Transformers, Volume 2, Tab 2
Eaton Specification Sheet - MD40E93
Selling Policy 25-000 - Distribution and Control Products and Services
Feature → Business Impact → Application: 40 kVA 3-phase rating delivers scalable power for motor drives and drive isolation needs, reducing the likelihood of under- or over-capacity faults and enabling consistent performance across equipment. This translates to improved uptime, predictable load handling, and lower spares inventory in motor control centers and packaging lines. Application: drive isolation in manufacturing lines, HVAC systems, and packaging equipment where reliable power for VFDs is critical. Feature → Ventilated, dry-type DT-3 design → Improved cooling and reduced moisture risk lowers thermal stress on windings, extending transformer life and maintaining performance in humid or dusty environments. Application: distribution panels and outdoor or semi-enclosed installations where ambient conditions vary. Feature → Aluminum windings and WS38 Weathershield → Lightweight construction with corrosion resistance and weather protection enhances serviceability and protects against outdoor exposure, decreasing maintenance cycles. Application: outdoor motor control centers and harsh production floors. Feature → Tap changes (+5% and -5%) → Voltage adaptability to compensate for load and supply variations, ensuring stable secondary voltage under fluctuating line conditions. Application: legacy drives and modern VFDs that require tight voltage control in variable supply environments. Feature → 460 V primary and 575Y/332 V secondary with 60 Hz, three-phase operation → Seamless integration with common industrial power rails and control architectures, reducing wiring complexity and enabling plug-and-play capability with Eaton or third-party drives. Application: retrofits and new line builds in food & beverage, automotive, and plastics sectors. Feature → UL Listed and 25-000 warranty coverage → Compliance assurance and reliable service policy lower risk for procurement teams and maintenance budgets. Application: procurement specs and long-term maintenance planning across industrial installations.
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FAQs
The MD40E93 features a primary voltage of 460 V and a secondary voltage of 575Y/332 V. It operates at 60 Hz in a three-phase configuration and includes taps at +5% and -5% to compensate for voltage variations in the system.
Yes, the MD40E93 is UL Listed, confirming compliance with recognized safety standards for electrical equipment. This certification supports installation in standard industrial environments and helps meet regulatory requirements for motor control applications.
Yes. Designed as a drive isolation transformer, the MD40E93 provides voltage isolation and noise separation between drives and control circuits, reducing interference with PLCs and variable frequency drives and improving control system reliability.
The unit measures 16.5 in (length/depth) by 30 in (height) by 23 in (width). It weighs 310 lb, and its ventilated dry-type design supports installation in standard electrical spaces with adequate clearance for airflow.
Warranty is Eaton Selling Policy 25-000, offering one year from installation or eighteen months from shipment, whichever comes first. This policy supports proactive maintenance planning and ensures access to replacement parts and service guidance.