Eaton MD550E90 Motor drive isolation transformer - UL Listed
Part Number: MD550E90
Quick Summary
The Eaton MD550E90 motor drive isolation transformer protects drive systems by isolating and filtering power in industrial motor applications. Many engineers face voltage spikes and control-loop noise that shorten equipment life and trigger protective trips. This model carries UL Listed certification and is designed as a DT-3 dry-type distribution transformer for three-phase motor drives, with a 550 kVA rating and WS35 weather shield compatibility. By isolating the drive from the supply and providing controlled voltage, it reduces downtime and supports safer, more reliable automation networks. For panel builders and OEM integrators, the unit’s ventilated cooling and adjustable taps simplify installation in varying site conditions, improving system resilience and maintenance planning.
Product Information
Extended Description
MD550E90 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, 550 kVA, Al windings, Frame: 920, uses WS35
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD550E90
UPC
786680331152
Product Length/Depth
36.23 in
Product Height
75 in
Product Width
44.2 in
Product Weight
2948 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
920
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
550 kVA
Weathershield
WS35
Ventilated, dry-type DT-3 construction delivers reliable cooling under continuous load, reducing thermal hotspots that shorten transformer life. The business impact is extended equipment uptime and lower maintenance costs for motor-drive installations. Applicability spans automated plant floors, packaging lines, and heavy-duty conveyors where reliable isolation protects sensitive drives from line disturbances. With a 550 kVA rating and 230 V primary feeding a 575Y/332 V secondary, this transformer supports large motor drives and control circuits from a single installation. The impact is fewer supply bottlenecks and improved voltage regulation, enabling tighter control loops and smoother startups in automation networks. Typical applications include drive systems for extrusion, pumps, and fans in process and manufacturing environments. Taps at +5% FCAN and -5% FCBN provide on-site voltage adjustment to compensate for grid swings and long cable runs. The benefit is consistent performance despite supply variations, reducing nuisance trips and optimizing efficiency. Designers can deploy the unit in existing panels without rewiring to new bus configurations, improving retrofit feasibility. Frame 920 and WS35 weather shield option support rugged industrial installation, including outdoor or harsh environments. Aluminum windings offer corrosion resistance and light weight for safer handling during installation, while UL Listed certification confirms adherence to safety standards. This combination translates to lower installation risk and faster commissioning in energy-intensive facilities. Installation considerations such as mounting clearances, ventilation, and proper tap setting are simplified by Eaton's documented practice and the included specifications sheet. The MD550E90 integrates with standard motor drives and distribution panels, reducing integration time and aligning with lean maintenance strategies. Engineers gain a robust, certified solution designed for long-term reliability in automation plants.
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FAQs
Begin by verifying panel dimensions: depth 36.23 in, width 44.2 in, and height 75 in, ensuring adequate ventilation around frame 920. Wire the 230 V primary and 575Y/332 V secondary according to Eaton’s wiring diagram. Set taps to +5% and -5% FCAN/FCBN to suit local voltage variation. Use the DT-3 dry-type enclosure for safe commissioning in automation environments.
MD550E90 delivers 550 kVA, three-phase operation at 60 Hz, with a 230 V primary and a 575Y/332 V secondary. It features ventilated dry-type cooling, frame 920, and a 150 °C rise, plus +5% and -5% taps. This configuration supports demanding motor-drive loads while maintaining voltage regulation and drive stability in automation installations.
Yes, with the WS35 weather shield option, the MD550E90 is suitable for outdoor or harsh environments. Its ventilated dry-type design provides reliable cooling, while aluminum windings offer corrosion resistance. UL Listed certification adds safety assurance for outdoor panel installations and industrial sites requiring durable power isolation for motor drives.
The MD550E90 is UL Listed, a key certification for industrial transformers used in motor-drive systems. It supports 60 Hz three-phase operation and DT-3 dry-type construction, aligning with safety and performance expectations for distribution transformers in automation networks. This helps ensure regulatory compliance and safer field deployment within panels and switchgear.
Deployment reduces downtime by mitigating voltage transients and drive noise that commonly cause trips in motor-drive networks. Improved voltage regulation leads to smoother startups and increased control accuracy, translating to higher throughput, lower maintenance costs, and extended asset life. The transformer also supports retrofit projects with on-site voltage taps, accelerating deployment and improving overall maintenance planning.