Eaton MD34E85 Motor drive isolation transformer - UL Listed
Part Number: MD34E85
Quick Summary
MD34E85 motor drive isolation transformer delivers clean, isolated power for drive systems in industrial automation. When voltage swings or insulation wear interrupts operation, productivity suffers and maintenance costs rise. UL Listed safety certification ensures reliable compliance for panel builders and OEMs, and supports DT-3 dry-type distribution design. This model is engineered for motor drives and three-phase distribution needs, offering reliable power management for OEMs and maintenance teams. By reducing voltage transients and improving isolation, downtime is minimized and panel life is extended. Designed for durable field service, the MD34E85 supports scalable architectures and simplifies compliance documentation for upgrade projects. Its ventilated dry-type design with aluminum windings helps meet high ambient temperatures while maintaining efficient operation.
Product Information
Extended Description
MD34E85 Eaton: Drive Isolation Transformer, Ventilated, Dry Type Distribution, DT-3, Three-phase, PV: 208V, Taps: 1 at +5% FCAN, 1 at -5% FCBN, SV: 230Y/133V, 150°C, 34 kVA, Al windings, Frame: 912B, uses WS38
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD34E85
UPC
786680001246
Product Length/Depth
16.5 in
Product Height
30 in
Product Width
23 in
Product Weight
310 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
912B
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
208 V
Secondary Voltage
230Y/133 V
Temperature rise
150 °C rise
Volt ampere rating
34 kVA
Weathershield
WS38
Commercial Distribution, Transformers, Volume 2, Tab 2
Eaton Specification Sheet - MD34E85
Selling Policy 25-000 - Distribution and Control Products and Services
DT-3 dry-type construction minimizes oil handling risk and enables safer installation in control panels and rack-mounted drives. This translates to lower maintenance costs and longer service life in manufacturing environments with limited space. The 34 kVA rating supports multiple drives or motor loads from a single transformer, reducing the need for parallel transformers and enabling more compact, cost-effective power distribution. 208 V primary and 230Y/133 V secondary with taps at +5% and -5% FCAN/FCBN provide voltage flexibility that reduces the need for extra site transformers while accommodating typical motor starting surges and line variations. WS38 weather shield and aluminum windings improve durability in exposed or harsh environments, while the 912B frame supports compatible mounting footprints, simplifying installation in existing enclosures. A 60 Hz, three-phase design, 150°C rise, and UL Listed certification together deliver reliable performance with predictable maintenance cycles. The ventilated cooling and dry-type construction reduce thermal stress on windings, supporting longer service life in continuous-duty applications like packaging, material handling, and process automation.
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FAQs
Yes. MD34E85 uses a 208 V primary in a three-phase configuration and is designed for ventilated, dry-type installations. It includes WS38 weather shield compatibility for outdoor or harsh indoor environments, and a 912B frame to fit common mounting footprints. With a weight of 310 lb and dimensions of 16.5 in (L), 30 in (H), and 23 in (W), it integrates into standard power-distribution layouts and control panels without special accommodations.
MD34E85 is a three-phase, 60 Hz transformer rated at 34 kVA. It features a primary voltage of 208 V, secondary voltage of 230Y/133 V, and taps at +5% FCAN and -5% FCBN. The design supports a 150°C rise and uses aluminum windings within a DT-3 dry-type distribution architecture, ensuring reliable operation under motor-drive starting and transient conditions.
The MD34E85 excels in automotive, packaging, material handling, and general factory automation where motor drives and three-phase control panels are prevalent. Its dry-type, ventilated design with WS38 weather shield makes it ideal for both indoor m rack-mounted drives and semi-exposed environments, providing clean power for VFDs, CNC machines, conveyors, and other drives that require robust isolation and voltage flexibility.
MD34E85 holds UL Listed certification, signifying adherence to essential safety standards for electrical equipment in industrial settings. This certification supports compliance when panel builders, OEMs, or contractors document safety for installation in control rooms, equipment racks, and service enclosures. The DT-3 dry-type design additionally aligns with industry practice for safe indoor distribution transformers.
The MD34E85 offers predictable maintenance through its ventilated dry-type design, aluminum windings, and robust WS38 shielding, contributing to lower thermal stress and longer life in continuous-operation drives. A 34 kVA rating reduces the need for parallel units in many lines, improving total cost of ownership, simplifying spare parts stocking, and delivering measurable uptime gains in high-throughput manufacturing environments.