Eaton MD550E88 Motor drive isolation transformer UL Listed
Part Number: MD550E88
Quick Summary
The Eaton MD550E88 motor drive isolation transformer provides reliable isolation for three-phase drive systems in industrial facilities. This helps mitigate motor drive noise, voltage transients, and nuisance faults that erode uptime in demanding manufacturing environments. It carries UL Listed certification for safety compliance, and CE marking and IP ratings are commonly expected in this sector, so confirm exact approvals in the datasheet. The dry-type, DT-3 design with aluminum windings delivers robust performance in harsh plant conditions while enabling straightforward service and maintenance. With a 550 kVA rating, 230 V primary, and 230Y/133 V secondary, this transformer supports scalable motor drive integration, helping OEMs meet efficiency and reliability targets.
Product Information
Extended Description
MD550E88 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: 230Y/133V, 150°C, 550 kVA, Al windings, Frame: 920, uses WS35
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD550E88
UPC
786680330353
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
230Y/133 V
Temperature rise
150 °C rise
Volt ampere rating
550 kVA
Weathershield
WS35
Feature: Dry-type DT-3 design with aluminum windings improves heat dissipation and reliability. Business impact: enhances thermal performance and reduces maintenance costs in continuous operation environments. Application: ideal for drive isolation in three-phase production lines and control panels. Feature: 550 kVA rating supports large drive loads with headroom, reducing transformer count and simplifying installations. Business impact: improves overall system efficiency and reduces capital expenditure in high-demand VFD applications. Application: suitable for OEMs integrating multiple drives in machine centers. Feature: Primary 230 V delta and secondary 230Y/133 V with taps at +5% and -5%. Business impact: voltage flexibility minimizes site voltage swings, improving drive performance and life. Application: plant feeders with fluctuating supply or long feeders. Feature: WS35 Weathershield enclosure and rugged frame 920. Business impact: enables outdoor or harsh environment installation, extending service life and reducing indoor footprint. Application: outdoor substations or protected enclosures in steel and manufacturing facilities. Feature: UL Listed certification and Eaton warranty. Business impact: procurement risk reduction and formal safety compliance. Application: regulated industries and equipment deployments where documented approvals are essential. Feature: 150°C temperature rise rating and aluminum windings. Business impact: supports high-load operation with reliable thermal margins. Application: continuous operation in demanding motor control environments, including conveyors and pumps.
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FAQs
Installation should begin with a proper site evaluation for space, mounting, and ventilation. Connect the primary to 230 V delta and the secondary to 230Y/133 V as specified, ensuring correct phase sequencing and secure terminations. Utilize the DT-3 dry-type design and WS35 enclosure for outdoor or harsh environments, and verify the +5% and -5% taps during voltage regulation checks to maintain stable drive performance.
The MD550E88 is a three-phase, 550 kVA, 60 Hz dry-type transformer with 230 V primary and 230Y/133 V secondary. It features aluminum windings, a DT-3 design, frame 920, and a 150 °C temperature rise. This combination supports high-load motor drives, with inline voltage regulation via taps and a robust, UL Listed safety profile.
Yes. The unit is equipped with WS35 weather shield and a rugged DT-3 dry-type design, making it suitable for outdoor or harsh indoor environments when installed with appropriate clearances and mounting. Ensure proper enclosure protection, ventilation, and compliance with local electrical codes to maximize reliability in outdoor or exposed locations.
MD550E88 carries UL Listed certification, indicating safety compliance for industrial use. While UL Listed is specified, CE marking and IP ratings are often expected in many regions; always confirm exact certifications in the datasheet or with Eaton to ensure alignment with your regulatory requirements and customer specifications.
Warranty follows Eaton’s policy: one year from installation or eighteen months from shipment, whichever occurs first. For ROI, plan for proper cooling and ventilation, regular inspection of windings and connections, and periodic testing of voltage taps. The transformer’s high 550 kVA rating and robust dry-type design support long service life with predictable maintenance cycles.