Eaton MD660E89 Motor Drive Isolation Transformer UL Listed
Part Number: MD660E89
Quick Summary
Eaton MD660E89 motor drive isolation transformer delivers clean, isolated power for drive systems in industrial environments. Engineers often grapple with voltage transients and harmonics that shorten motor life and trigger unexpected downtime. UL Listed safety certification accompanies this 660 kVA dry-type DT-3 design, with aluminum windings and a 150 °C rise, ensuring reliable performance across regional codes. In practice, the MD660E89 simplifies integration between 230 V mains and 460Y/266 V secondary circuits, helping you meet reliability targets while keeping installation costs manageable.
Product Information
Extended Description
MD660E89 Eaton: Eaton 660 kVA Rating; 3-Phase; DT-3 Drive Isolation Transformer; Ventilated; 230; 460Y/266; 150 Degree C; Aluminum Windings
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD660E89
UPC
786680337109
Product Length/Depth
0.001 in
Product Height
0.001 in
Product Width
0.001 in
Product Weight
0.001 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
Tap size
1 at +5% FCAN, 1 at -5% FCBN
Type
Dry Type Distribution, Drive Isolation Transformer
Frequency rating
60 Hz
Kva Rating
660 kVA
Phase
Three-phase
Primary voltage
230 V
Secondary Voltage
460Y/266 V
Temperature rise
150 °C rise
The 660 kVA three-phase drive isolation transformer combines a DT-3 dry-type design with a ventilated enclosure to ensure dependable operation in demanding industrial environments. This feature set delivers true isolation between power distribution and motor drives, reducing the impact of electrical noise and transients on sensitive VFDs and motors, which translates to higher overall equipment uptime and longer motor life. With a 60 Hz frequency rating and 230 V primary to 460Y/266 V secondary configuration, it smoothly integrates with common facility power while supporting consistent performance across operating cycles. The standard tap arrangement at +5% FCAN and -5% FCBN provides practical voltage regulation to accommodate supply variations without triggering over-volt or under-volt conditions. Aluminum windings keep the unit lightweight for easier installation and maintenance while offering excellent thermal performance. The 150 °C temperature rise rating provides a robust margin for warm factory environments, supporting steady operation in extended loading scenarios. UL Listed certification reinforces safety compliance, documentation readiness, and regional market eligibility, making the MD660E89 a prudent choice for controlled environments where reliability and predictable behavior are paramount. Overall, this transformer aligns with industry best practices for motor drive isolation, enabling cost-effective expansion of automated lines and scalable plant-wide power protection. In practice, engineers benefit from fast installation compatibility with standard switchgear and bus systems, reducing project risk and accelerating time-to-value for new or upgraded drive-centric installations.
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FAQs
The MD660E89 is a 660 kVA, three-phase, dry-type drive isolation transformer with a ventilated enclosure. Plan for adequate clearance for ventilation, allow for 230 V input and 460Y/266 V output connections, and verify compatibility with existing VFDs. Its aluminum windings and DT-3 design support lightweight mounting and reliable operation in controlled environments, with UL Listed safety as a baseline compliance reference.
Expect improved drive reliability due to reduced electrical noise and voltage transients, which lowers motor stress and downtime. The 60 Hz rating, 230 V primary and 460Y/266 V secondary voltages, and ventilated dry-type construction help maintain stable voltage delivery to drives, translating to longer motor life, fewer nuisance trips, and smoother acceleration in demanding automation tasks.
Yes. While designed with Eaton DT-3 characteristics in mind, the MD660E89’s 230 V to 460Y/266 V configuration and three-phase 60 Hz operation are compatible with a broad range of drive systems. Always verify input/output voltage tolerance, tap settings, and enclosure clearance with the specific VFD manufacturer guidelines to ensure a safe, code-compliant installation.
The MD660E89 carries UL Listed certification, signaling adherence to recognized electrical safety standards. The warranty follows Eaton’s policy 25-000, offering one year from installation or eighteen months from shipment, whichever occurs first. This coverage supports long-term reliability and provides a structured framework for maintenance planning and part replacement.
Prioritize proper ventilation, accessible primary and secondary terminations, and correct tap setting at +5% FCAN and -5% FCBN to compensate for supply variability. Routine inspections should monitor insulation integrity and winding temperatures, leveraging the 150 °C rise rating as an indicator of thermal headroom. With UL Listed compliance and durable aluminum windings, the MD660E89 offers predictable performance and reduced lifecycle costs in automation projects.