Eaton MD34E86 Motor drive isolation transformer - UL Listed
Part Number: MD34E86
Quick Summary
Eaton MD34E86 motor drive isolation transformer delivers robust drive isolation for three-phase motor systems used in demanding industrial environments. It protects sensitive drive electronics from voltage spikes and harmonics, reducing nuisance trips and extending motor drive life. UL Listed safety certification accompanies its dry-type DT-3 design, with aluminum windings and a 34 kVA rating to support scalable drive systems. This transformer is ideal for rugged control panels and OEM installations, offering a reliable 208 V input, 460Y/266 V secondary, and easy field taps for +5% and -5% adjustments. Across manufacturing and process industries, reliable isolation reduces downtime, simplifies compliance audits, and helps meet standard protection requirements for motor drives.
Product Information
Extended Description
MD34E86 Eaton: Drive Isolation Transformer, Ventilated, Dry Type Distribution, DT-3, Three-phase, PV: 208V, Taps: 1 at +5% FCAN, 1 at -5% FCBN, SV: 460Y/266V, 150°C, 34 kVA, Al windings, Frame: 912B, uses WS38
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD34E86
UPC
786680001413
Product Length/Depth
16.5 in
Product Height
30 in
Product Width
23 in
Product Weight
339 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
460Y/266 V
Temperature rise
150 °C rise
Volt ampere rating
34 kVA
Weathershield
WS38
Ventilated dry-type DT-3 construction with aluminum windings delivers superior cooling and insulation longevity. The business impact is lower insulation aging, higher uptime, and reduced maintenance in hot, crowded control cabinets. It’s particularly well-suited for factory floors and panelboards where ambient heat and limited airflow challenge drive reliability. The 34 kVA rating with a 208 V primary and 460Y/266 V secondary provides ample headroom for startup transients and simultaneous loads, reducing deratings and extending drive life in mid-size conveyors, pumps, and machine-control centers. Field-accessible taps at +5% FCAN and -5% FCBN enable precise voltage compensation without rewiring, improving regulation and preventing drive overheating during commissioning in variable-supply environments. UL Listed safety certification, WS38 compatibility, and a 912B frame support compliant, easy-installation deployment in both indoor and controlled outdoor spaces. Overall, this transformer delivers reliable isolation for three-phase drives at 60 Hz, with predictable lifecycle performance that minimizes total cost of ownership.
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FAQs
MD34E86 installation requires adequate ventilation clearance, a rigid mounting surface, and clean cable routing to minimize EMI. Verify 208 V primary and 460Y/266 V secondary connections, and only adjust taps if line voltage warrants it. Follow UL Listed safety guidelines and ensure the DT-3 vented enclosure and WS38 compatibility are respected for outdoor or harsh environments.
Check that your system uses a 208 V distribution with a 460Y/266 V secondary suitable for your drive input. Confirm three-phase operation at 60 Hz and the DT-3 dry-type configuration. Ensure the control cabinet or panel can accommodate the 912B frame and the 16.5 in x 23 in x 30 in footprint, plus WS38 mounting if used outdoors.
Yes, the MD34E86 is designed for demanding industrial environments, leveraging a ventilated dry-type DT-3 design with aluminum windings. It carries UL Listed certification, which supports safety and compliance in typical manufacturing and distribution settings. When outdoor or harsh conditions are expected, the WS38 weathershield option helps maintain performance and longevity.
The +5% and -5% taps allow small voltage adjustments to compensate for line fluctuations, helping maintain stable drive input voltage and reducing the risk of over- or under-voltage conditions. Use them during commissioning, in plants with variable utility feeds, or where long feeder runs cause measurable voltage drop to ensure optimal drive performance.
Expect lower maintenance costs due to improved insulation longevity, reduced drive outages, and simpler panel design thanks to reliable galvanic isolation. The 34 kVA rating supports scalable drive loads, while aluminum windings reduce weight and corrosion risk. Combined with Eaton warranty and service support, this transformer offers a favorable total cost of ownership in medium to large throughput lines.