Eaton MD660E90 Motor Drive Isolation Transformer - UL
Part Number: MD660E90
Quick Summary
Eaton MD660E90 is a motor drive isolation ventilated transformer designed for reliable power isolation in large three‑phase drive systems. It addresses common pain points like drive disturbances, voltage sags, and harmonics that trigger equipment trips. The unit carries UL Listed certification and is built for demanding industrial environments, featuring a 150°C rise and aluminum windings for efficient cooling. With the DT-3 design and taps at +5% and -5%, it maintains voltage stability across varying motor loads. By isolating the drive from the distribution network, it supports longer motor life, improved control accuracy, and reduced downtime, delivering clear business value through safer, compliant operation.
Product Information
Extended Description
MD660E90 Eaton: Eaton 660 kVA Rating; 3-Phase; DT-3 Drive Isolation Transformer; Ventilated; 230; 575Y/332; 150 Degree C; Aluminum Windings
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD660E90
UPC
786680337208
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
575Y/332 V
Temperature rise
150 °C rise
Eaton Specification Sheet - MD660E90
Selling Policy 25-000 - Distribution and Control Products and Services
Feature → Business Impact → Application: DT-3 dry‑type design provides reliable drive isolation with minimized interference to sensitive motor controls, improving control accuracy and reducing trips in high-humidity production lines. Application in large three‑phase drives benefits from a ventilated construction that maintains cooler operating temperatures, lowering thermal stress and extending component life. Feature → Aluminum windings offer lightweight, efficient heat dissipation, decreasing cooling requirements and energy losses in continuous duty drives. Application in packaging, conveyors, and robotics lines translates to measurable efficiency gains and predictable maintenance windows. Feature → Tap options at +5% FCAN and -5% FCBN enable voltage stability across fluctuating loads, reducing motor stall events and preserving PWM performance. Application in variable-speed drives benefits from simplified commissioning and improved protection against voltage sag. Feature → 660 kVA rating and 60 Hz operation ensure compatibility with standard industrial power environments, enabling straightforward integration in existing facilities. Application in motor control cabinets reduces system downtime and simplifies stocking of spare parts. The UL Listed certification further supports compliance and reliability in quality‑conscious facilities.
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FAQs
Install within a ventilated cabinet or dedicated transformer compartment, ensuring adequate clearance for heat dissipation and service access. Mount securely to minimize vibration, select taps at +5% FCAN or -5% FCBN as required by load, and connect primary to 230 V with correct phase sequence. Follow UL listed wiring methods and Eaton installation guidelines to achieve reliable long-term performance.
The unit delivers 660 kVA at 60 Hz in a three‑phase configuration, with a primary voltage of 230 V and a secondary of 575Y/332 V. It uses a DT‑3 dry‑type ventilated design with aluminum windings and a 150°C temperature rise. Tap options provide voltage stability (+5% FCAN, -5% FCBN) to accommodate load variations and motor sizes.
Yes. Its dry‑type drive isolation design reduces drive‑train electrical noise and harmonics, protecting sensitive drive electronics and improving control accuracy. The ventilated construction supports continuous operation in demanding environments, while the 230 V to 575Y/332 V configuration aligns with common plant electrical mains and most motor drive inputs found in packaging lines and conveyors.
MD660E90 carries UL Listed certification, signaling compliance with recognized safety standards for electrical equipment. This supports code compliance, safer maintenance procedures, and warranty eligibility. For project-specific certifications beyond UL, consult the Eaton datasheet and local regulatory requirements to ensure alignment with site‑level compliance and inspection regimes.
Maintenance is minimal but essential: ensure proper ventilation, verify cooling airflow, and confirm taps remain appropriate for load conditions. The transformer contributes to ROI through longer motor life, reduced downtime, and improved drive reliability, which lowers maintenance costs and energy waste. Warranty terms include one year from installation or eighteen months from shipment, whichever occurs first.