Eaton MD40D99 Motor drive isolation transformer - UL Listed
Part Number: MD40D99
Quick Summary
Motor drive isolation transformer isolates and stabilizes power for drive systems in industrial applications, ensuring reliable motor control and protection. Many facilities struggle with voltage transients, maintenance costs, and space constraints that threaten uptime. UL Listed certification confirms compatibility with safety standards for dry-type distribution equipment. Designed for three-phase 480 V systems, the MD40D99 delivers 40 kVA in a compact DT-3 enclosure with frame 912B. This solution supports straightforward installation, proven performance, and long-term cost savings by reducing nuisance trips and protecting sensitive electronics. In demanding environments, its ventilated design and aluminum windings enable efficient cooling and durable operation, aligning with maintenance teams' needs and project schedules.
Product Information
Extended Description
MD40D99 Eaton: Drive Isolation Transformer, Ventilated, Dry Type Distribution, DT-3, Three-phase, PV: 480 delta, Taps: 2 at +2.5% FCAN, 2 at -2.5% FCBN, SV: 480 delta, 150°C, 40 kVA, Al windings, Frame: 912B, uses WS38
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD40D99
UPC
786680080234
Product Length/Depth
16.5 in
Product Height
30 in
Product Width
23 in
Product Weight
341 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
2 at +2.5% FCAN, 2 at -2.5% FCBN
Type
Dry Type Distribution, Drive Isolation Transformer
Frequency rating
60 Hz
Phase
Three-phase
Primary voltage
480 V
Secondary Voltage
480 V
Temperature rise
150 °C rise
Volt ampere rating
40 kVA
Weathershield
WS38
The MD40D99 uses a ventilated dry-type DT-3 design with aluminum windings and a robust 912B frame, delivering safe, reliable operation while eliminating the complexities of oil-filled equipment. This configuration reduces fire risk, simplifies service, and enables straightforward installation in modern panels. With a 40 kVA rating and three-phase 480 V primary and secondary at 60 Hz, it provides stable voltage for motor drives, improving control reliability and reducing nuisance trips in automated lines such as conveyors and packaging systems. Tap changes at +2.5% and -2.5% allow precise voltage adjustment to accommodate supply variations, lowering drive stress and extending component life. The WS38 weathershield protects the enclosure in harsh environments, while the ventilated design supports efficient cooling and long service intervals. Compact dimensions (16.5 in depth, 23 in width, 30 in height) and a 341 lb footprint favor retrofit projects and space-constrained installations. Eaton’s warranty and UL Listed certification reinforce safety and long-term support for mission-critical applications.
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FAQs
MD40D99 is a dry-type, DT-3 design rated for three-phase 480 V operation. Install in a ventilated, accessible electrical room or panel with WS38 protection. Ensure room for the 912B frame, provide adequate clearance for cooling, and connect to compatible drive control electronics. Verify alignment with panel standards and local codes during mounting.
MD40D99 delivers 40 kVA at 60 Hz with 480 V primary and 480 V secondary. It features aluminum windings, DT-3 design, frame 912B, and taps of +2.5% FCAN and -2.5% FCBN to accommodate voltage variations. The unit uses a ventilated dry-type construction and provides a 150 °C rise, suitable for demanding motor drive environments.
Yes. The MD40D99 is purpose-built for drive isolation in three-phase motor systems and packaging conveyors. Its 40 kVA rating supports motor drive electronics, while the isolation transformer reduces transients and harmonics, enhancing uptime, protecting drives, and simplifying maintenance in continuous-duty lines.
MD40D99 carries UL Listed certification, validating compliance with recognized safety standards for dry-type distribution transformers and motor drive isolation equipment, and supporting safe integration into industrial control panels and automation systems.
Eaton provides a warranty under policy 25-000: one year from installation or eighteen months from shipment, whichever occurs first. This coverage supports field service, parts availability, and ongoing reliability for mission-critical automation projects.