Eaton MD550E94 Motor drive isolation transformer - UL
Part Number: MD550E94
Quick Summary
The Eaton MD550E94 motor drive isolation transformer delivers clean, isolated power for three‑phase drive systems in manufacturing and process environments. Plant operators confront voltage transients, harmonics, and overheating that drive unplanned downtime and expensive repairs. This unit is UL Listed, with a DT-3 dry-type design and a 150°C rise, supporting demanding distribution and motor-drive applications. Its 575 V primary and 230Y/133 V secondary, 60 Hz operation, and 550 kVA rating deliver reliable power conditioning for modern automation, reducing nuisance trips and extending drive life. Optional WS35 weather shield enhances outdoor or harsh-environment installations, while the aluminum windings and rugged 920E frame enable durable, long-term performance in industrial facilities.
Product Information
Extended Description
MD550E94 Eaton: Drive Isolation Transformer, Ventilated, Dry Type Distribution, DT-3, Three-phase, PV: 575 delta, Taps: 1 at +5% FCAN, 1 at -5% FCBN, SV: 230Y/133V, 150°C, 550 kVA, Al windings, Frame: 920E, uses WS35
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD550E94
UPC
786680339165
Product Length/Depth
36.23 in
Product Height
75 in
Product Width
44.2 in
Product Weight
4107 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
920E
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
575 V
Secondary Voltage
230Y/133 V
Temperature rise
150 °C rise
Volt ampere rating
550 kVA
Weathershield
WS35
Commercial Distribution, Transformers, Volume 2, Tab 2
Eaton Specification Sheet - MD550E94
Selling Policy 25-000 - Distribution and Control Products and Services
The DT-3 dry-type design with aluminum windings and a 920E frame provides robust isolation and dependable thermal performance for three‑phase drive circuits. With a 550 kVA rating, it supports sizeable motor loads while simplifying maintenance in automation panels and distributed drives. Direct 575 V primary to 230Y/133 V secondary compatibility aligns with common plant voltages, reducing wiring complexity and startup adjustments. The 60 Hz rating ensures dependable operation with standard industrial power, helping facilities meet uptime targets. Voltage taps at +5% FCAN and -5% FCBN enable on-site voltage compensation, minimizing over- or under-voltage stress on drives and extending motor life. Ventilated enclosure design improves cooling under peak demand, and WS35 weather shield availability adds outdoor capability for harsh environments. UL Listed safety, rugged construction, and a 1-year (or 18-month from shipment) warranty provide risk mitigation and predictable total cost of ownership.
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FAQs
For three-phase drive installations, mount the DT-3 dry-type transformer in a ventilated enclosure with ample clearance for cooling. The MD550E94 uses a 575 V primary and 230Y/133 V secondary at 60 Hz, in a 920E frame with aluminum windings. Check taps at +5% FCAN and -5% FCBN during commissioning, and consider WS35 weather shield for outdoor or harsh environments. Verify UL Listed compliance during integration.
Key specs include a 550 kVA rating, 575 V primary, 230Y/133 V secondary, 60 Hz operation, and a 150°C rise. The aluminum windings and DT-3 dry-type construction provide isolation and thermal robustness, while insulated windings reduce losses. These characteristics support reliable drive protection, improved efficiency, and stable performance in automated manufacturing lines.
Yes. The MD550E94 is designed for demanding, high-throughput environments, offering 550 kVA capacity and three-phase operation to support sizable motor drives. Its ventilated dry-type construction and WS35 option enable reliable operation in hot or outdoor areas, reducing downtime and allowing continuous production with conditioned power for critical drives.
The MD550E94 is UL Listed, signaling conformance with essential electrical safety standards and safer field integration. While CE and IP data are not provided in the available specification, UL Listing remains a robust indicator of safety compliance for electrical distribution equipment and drive isolation transformers used in many continental markets.
The transformer carries a one-year warranty from installation or eighteen months from shipment, whichever occurs first. Regular maintenance should focus on confirming tap positions (+5% and -5%), checking cooling performance, and inspecting the WS35 shield if installed outdoors. By reducing startup transients and protecting drives, the MD550E94 can lower downtime costs and extend drive life, improving return on investment.