Eaton MD34E66 Motor drive isolation transformer UL Listed
Part Number: MD34E66
Quick Summary
Eaton MD34E66 motor drive isolation transformer provides safe power isolation for three-phase drive systems. It helps protect sensitive drives from electrical noise and fault currents, reducing downtime and maintenance emergencies. UL Listed certification confirms compliance with recognized safety standards essential for panel builders and operators. This dry-type, ventilated transformer with a DT-3 design and WS38 protection aligns with modern control-panel requirements, while offering straightforward installation and compatibility with standard drive components. In addition, the 34 kVA rating and 460 V to 380Y/220 V configuration support scalable drive applications, delivering reliability across industrial automation projects.
Product Information
Extended Description
MD34E66 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: 380Y/220, 150°C, 34 kVA, Al windings, Frame: 912B, uses WS38
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD34E66
UPC
786685197470
Product Length/Depth
16.5 in
Product Height
30 in
Product Width
23 in
Product Weight
327 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
460 V
Secondary Voltage
380Y/220 V
Temperature rise
150 °C rise
Volt ampere rating
34 kVA
Weathershield
WS38
Feature: Dry-type DT-3 construction with aluminum windings and a ventilated enclosure provides safe, low-fire-risk operation in demanding environments. This design reduces cooling requirements and simplifies maintenance compared to oil-filled transformers, lowering total cost of ownership in motor-drive panels. Business Impact: Increases plant safety, lowers maintenance intervals, and improves uptime for critical drives. Application: Ideal for control panels and switchgear in conveyor, pump, and CNC applications where reliable power isolation is essential. Feature: 34 kVA rating with 460 V primary and 380Y/220 V secondary; 60 Hz, three-phase operation. Business Impact: Supports multiple loads with stable voltage, reducing motor torque ripple and transient stress. Application: Drives, robotics, and material handling systems requiring clean, regulated power. Feature: Tap changers (+5% FCAN, -5% FCBN) enable on-site voltage regulation. Business Impact: Compensates for line sag or surge, preserving drive performance and extending component life. Application: Sites with fluctuating grid conditions or long feeders. Feature: WS38 weather shield compatibility and DT-3 dry-type design enhance installation versatility. Business Impact: Facilitates outdoor or harsh-environment mounting with reliable cooling, reducing enclosure footprint in the control room. Application: Outdoor machinery rooms and exposed industrial environments. Feature: Dimensions 16.5 in L × 23 in W × 30 in H and weight around 327 lb with a Frame 912B. Business Impact: Predictable footprint and weight aid panel designers and retrofit projects, enabling straightforward installation. Application: Retrofit and new-build drive centers with limited space. Feature: UL Listed certification and Eaton warranty provide risk reduction and long-term support. Business Impact: Streamlines qualification for safety audits and procurement, while offering peace of mind for maintenance planning. Application: System integrators and OEMs seeking compliant, supported power isolation solutions.
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FAQs
For panel integration, verify adequate clearance for ventilation, secure mounting on a rigid base, and appropriate cable entries. Use the 912B frame with WS38-compatible protection in outdoor or harsh indoor locations. Plan for the 16.5 inch depth, 23 inch width, and 30 inch height to ensure access for taps and connections, while observing weight constraints for panel bracing.
The 460 V primary and 380Y/220 V secondary configuration provides clean, stepped voltage suitable for three-phase motor drives, reducing voltage stress and improving motor performance. Coupled with a 34 kVA rating and 60 Hz operation, it supports multiple drives from a single transformer, optimizing space in control centers.
Yes. The DT-3 dry-type design and aluminum windings are optimized for ventilated cooling, while WS38 compatibility expands protection against dust and moisture in challenging sites. This pairing simplifies outdoor or harsh indoor installations without the maintenance burdens of oil-filled units.
The MD34E66 carries UL Listed certification, assuring compliance with recognized safety standards for industrial equipment. Eaton provides a warranty policy of one year from installation or eighteen months from shipment, whichever occurs first, supporting maintenance planning and risk mitigation.
By isolating drives from line transients, reducing downtime, and enabling voltage regulation through taps, the transformer lowers maintenance costs and extends motor life. Its compact footprint, robust dry-type construction, and vendor support help shorten installation cycles and improve system reliability, delivering a favorable return on investment in automation applications.