Eaton MD770E91 Motor drive isolation ventilated - UL Listed
Part Number: MD770E91
Quick Summary
MD770E91 motor drive isolation ventilated transformer provides clean, isolated power for drive systems in industrial automation. In many facilities, drive interference and voltage fluctuations disrupt production, shorten equipment life, and complicate maintenance. This transformer minimizes those risks by providing a dedicated, regulated power source for three-phase drive electronics, with a 460 V primary and 230Y/133 V secondary. UL Listed safety certification, the DT-3 dry-type design, and WS35 weather shield equip it to perform reliably in harsh environments and outdoor enclosures. With aluminum windings and robust frame 920, it combines efficiency with rugged durability. Taps at +5% FCAN and -5% FCBN offer field voltage adjustments, enabling smoother operation across varying site conditions. This translates to reduced downtime and improved uptime for critical machinery.
Product Information
Extended Description
MD770E91 Eaton: Drive Isolation Transformer, Ventilated, Dry Type Distribution, DT-3, Three-phase, PV: 460 delta, Taps: 1 at +5% FCAN, 1 at -5% FCBN, SV: 230Y/133V, 150°C, 770 kVA, Al windings, Frame: 920, uses WS35
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD770E91
UPC
786680337352
Product Length/Depth
36.23 in
Product Height
75 in
Product Width
44.2 in
Product Weight
2900 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
460 V
Secondary Voltage
230Y/133 V
Temperature rise
150 °C rise
Volt ampere rating
770 kVA
Weathershield
WS35
Three-phase dry-type construction with drive isolation provides clean power, reducing electrical noise and protecting sensitive drive electronics from transient events, boosting reliability and motor life. This design minimizes nuisance tripping and enhances drive stability during line disturbances, making it ideal for packaging lines, conveyors, and other automated systems. The 460 V primary delta and 230Y/133 V secondary outputs deliver direct compatibility with common drive architectures, simplifying integration in retrofit projects and new builds alike. A 770 kVA rating with a 150 °C rise offers high-load capability with ample insulation margin, supporting multiple drives or high-inrush loads without compromising safety. Aluminum windings reduce weight while maintaining durability, and the WS35 weather shield enables outdoor or rugged indoor installations. Taps at +5% FCAN and -5% FCBN provide voltage tuning to compensate for long feeders and fluctuating supplies, shortening commissioning time and improving regulation. Frame 920 and mounting provisions streamline installation in standard transformer rooms, while UL Listed certification supports procurement compliance and ongoing reliability.
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FAQs
Plan for a dedicated transformer room or enclosure with adequate ventilation and clearance for a heavy unit (frame 920, approximately 2900 lb). Ensure 460 V three-phase supply is wired to the primary delta, with the secondary configured to 230Y/133 V for drive electronics. Verify the WS35 weather shield and mounting provisions meet your enclosure requirements, and note taps at +5% FCAN and -5% FCBN for site voltage adjustments.
The 770 kVA rating supports multiple high-demand drives or a single large drive with headroom, while the 150 °C rise ensures insulation safety under peak loading. The three-phase 60 Hz design with aluminum windings delivers efficient operation and robust thermal performance. Design features such as DT-3 and WS35 further support reliable operation in demanding environments with modest ventilation needs.
Yes. The MD770E91 is well suited for large conveyors and heavy machinery, providing drive isolation to improve power quality and reduce interference with drive electronics. Its rugged construction, UL Listed safety certification, and ample voltage flexibility (460 V to 230Y/133 V) make it a practical choice for factory automation, material handling, and industrial equipment fleets.
The MD770E91 carries UL Listed certification, indicating compliance with established safety standards for electrical equipment. While the provided data highlights UL Listed status, this product is designed to meet the requirements of a dry-type distribution transformer with drive isolation, and it adheres to common industrial safety expectations for three-phase power systems in industrial settings.
Maintenance focuses on routine inspection of insulation and connections, verification of taps at +5% FCAN and -5% FCBN, and periodic enclosure cleaning to maintain ventilation. The high reliability and drive isolation reduce downtime, protect motor drives from transients, and extend motor life, delivering a favorable return on investment through improved uptime and reduced maintenance incidents in automated facilities.