Eaton MD550E89 Motor drive isolation transformer -UL Listed
Part Number: MD550E89
Quick Summary
Motor drive isolation transformer provides clean, isolated power for sensitive drives in industrial automation applications. This design addresses voltage swings and harmonic disturbances that commonly cause drive faults and downtime. UL Listed safety certification supports compliant installation in diverse facilities, while the DT-3 ventilated dry-type construction supports reliable operation in demanding environments. With a high 550 kVA rating, three-phase configuration, and selectable taps, this transformer delivers robust performance for modern motor drives, improving uptime and power quality across manufacturing lines and processing plants.
Product Information
Extended Description
MD550E89 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: 460Y/266V, 150°C, 550 kVA, Al windings, Frame: 920, uses WS35
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD550E89
UPC
786680330759
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
460Y/266 V
Temperature rise
150 °C rise
Volt ampere rating
550 kVA
Weathershield
WS35
Feature → Business Impact → Application: Dry-type distribution design minimizes fire risk and eliminates oil containment concerns, enabling safer, easier compliance in indoor and semi-outdoor spaces. Result: reduced maintenance cost and simplified safety audits for motor-drive cabinets in harsh environments. Application: Three-phase 60 Hz operation with 230 V primary and 460Y/266 V secondary supports common plant electrical architectures, enabling plug-and-play integration with VFDs and soft starters. Feature → Business Impact → Application: Ventilated cooling (WS35) maintains steady temperature rise performance, promoting reliability under peak loads. Result: lower risk of derating and longer component life in continuous-drive duty cycles. Feature → Business Impact → Application: Frame 920, DT-3 design with WS35 weather shield improves installation versatility and serviceability, even in confined spaces. Result: faster commissioning and easier retrofits in retrofit-heavy facilities. Feature → Business Impact → Application: 1 at +5% and 1 at -5% taps allow voltage compensation to maintain drive performance in variable supply conditions. Result: improved drive efficiency and reduced nuisance tripping during grid fluctuations. Feature → Business Impact → Application: Aluminum winding reduces weight and thermal stress, contributing to overall efficiency and lower cooling requirements. Result: tangible energy savings and simpler handling during installation.
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FAQs
MD550E89 uses a dry-type, ventilated DT-3 design with WS35 weather shield and frame 920. It's suitable for indoor and outdoor-like spaces with proper ventilation. Ensure adequate clearance for cooling and access for service, confirm 60 Hz supply and three-phase connections, and verify voltage taps (+5% and -5%). Proper mounting and protection against dust and moisture are recommended to maintain long-term reliability.
Core specs include three-phase operation at 60 Hz, 230 V primary, and 460Y/266 V secondary, with a 550 kVA rating and 150 °C rise. The transformer offers two voltage taps (+5% FCAN, -5% FCBN) for voltage compensation, and aluminum windings with a DT-3 design. These factors collectively support stable drive isolation, voltage regulation, and robust operation under peak loads.
Yes, as a drive isolation transformer with a ventilated dry-type design, it helps improve power quality for motor drives and soft starters. The 550 kVA rating and appropriate secondary voltage (460Y/266 V) support VFDs and inverter-based drives, reducing coupling and harmonic transfer to the utility. Tap adjustments further aid in maintaining drive performance during voltage fluctuations.
The MD550E89 carries UL Listed certification, confirming compliance with electrical safety standards for industrial equipment. This certification supports safer installation, reduces compliance risk in regulated environments, and facilitates acceptance by electrical inspectors and procurement teams within many regions.
The dry-type, vented design minimizes oil handling and related spill risk, lowering maintenance and environmental concerns. Aluminum windings reduce weight and thermal stress, improving efficiency and ease of handling. The 1-year warranty (18 months from shipment) provides initial protection, while reliable ventilation and shielding (WS35) contribute to longer service intervals and reduced downtime.