Eaton MD40E86 Motor drive isolation ventilated transformer - UL Listed
Part Number: MD40E86
Quick Summary
The Eaton MD40E86 motor drive isolation ventilated transformer provides clean, isolated power for motor drives in industrial plants. Engineers wrestle with voltage fluctuations and heat that shorten drive life and complicate maintenance. UL Listed safety certification supports reliable operation in harsh industrial environments, while its DT-3 design and 150°C rise meet demanding standards. With a 40 kVA rating and a dry-type construction using aluminum windings, the unit delivers compact installation and efficient, long-term performance. Designed for 208 V primary and 460Y/266 V secondary, this transformer protects drives and simplifies panel layouts, while WS38 weather shield compatibility supports outdoor or harsh environments.
Product Information
Extended Description
MD40E86 Eaton: Drive Isolation Transformer, Ventilated, Dry Type Distribution, DT-3, Three-phase, PV: 208V, Taps: 1 at +5% FCAN, 1 at -5% FCBN, SV: 460Y/266V, 150°C, 40 kVA, Al windings, Frame: 912B, uses WS38
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD40E86
UPC
786680001420
Product Length/Depth
16.5 in
Product Height
30 in
Product Width
23 in
Product Weight
349 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
460Y/266 V
Temperature rise
150 °C rise
Volt ampere rating
40 kVA
Weathershield
WS38
Feature → Business Impact → Application: Three-phase dry-type isolation transformer with ventilated DT-3 design. Improves safety and heat management in drive enclosures, reducing thermal buildup and extending component life. Applied to motor drives in manufacturing lines and high-demand automation cells. Feature → Business Impact → Application: Primary 208 V / Secondary 460Y/266 V with taps at +5% FCAN and -5% FCBN. Enables voltage regulation flexibility to minimize nuisance tripping, simplify panel wiring, and support multi-volt equipment in mixed-he power environments. Applied to plant-wide drive systems and distribution panels. Feature → Business Impact → Application: 40 kVA rating, Frame 912B, and WS38 weather shield compatibility. Delivers a compact footprint with robust protection, easing installation in tight spaces and outdoor or harsh environments. Applied to retrofit and new builds in factories and processing facilities. Feature → Business Impact → Application: Aluminum windings and 150°C rise. Enhances efficiency, thermal performance, and long-term reliability, reducing cooling requirements and maintenance cycles. Applied to high-load drives and continuous-duty applications. Feature → Business Impact → Application: UL Listed certification. Provides validated safety and compliance for electrical equipment in North America, supporting procurement and risk management. Applied to all panel and enclosure installations requiring recognized standards. Feature → Business Impact → Application: One-year warranty from installation or eighteen months from shipment. Shifts risk to supplier while ensuring fast support and total-cost-of-ownership savings for maintenance teams. Applied to capital projects and service contracts.
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FAQs
MD40E86 uses a frame 912B footprint and weighs 349 lb, facilitating mounting in standard industrial panels. Its WS38 weather shield compatibility supports outdoor or harsh environments, while the 16.5 in depth, 23 in width, and 30 in height enable planning around existing enclosures and ventilation. Ensure clearances meet the 60 Hz, three-phase load profile and allow proper cooling air flow.
The transformer has a primary of 208 V and a secondary of 460Y/266 V. It features taps at +5% FCAN and -5% FCBN, enabling fine voltage regulation to maintain consistent motor drive performance and reduce nuisance tripping in variable-voltage environments.
Yes, the MD40E86 is a three-phase, dry-type isolation transformer designed for motor drives. It is rated at 40 kVA, making it appropriate for mid-to-large motor drive applications. Its DT-3 design and ventilated construction support reliable operation in continuous-use automation systems at 60 Hz.
MD40E86 is UL Listed, ensuring compliance with safety standards for electrical equipment used in industrial environments. This certification facilitates procurement, OEM integration, and regulatory acceptance in North American facilities, reducing qualification time for panel builders and maintenance teams.
The unit’s dry-type design, aluminum windings, and 150°C rise support robust heat management with reduced cooling requirements. This translates to lower energy usage, longer drive life, and fewer unplanned downtimes. The 40 kVA rating also provides scalable headroom for peak drive loads, improving overall system reliability and total cost of ownership.