Eaton MD34E79B Motor - UL Listed Transformer
Part Number: MD34E79B
Quick Summary
The Eaton MD34E79B motor isolation transformer is designed to decouple drive electronics from the power network in industrial motor drives. Engineers often battle voltage transients and EMI that shorten component life and raise maintenance costs. UL Listed certification demonstrates safety compliance, and the DT-3 dry-type construction provides rugged reliability in demanding factory environments. By delivering clean power with configurable taps and robust cooling, this transformer supports uptime, compliance, and cost-effective expansion of motor-drive systems. The unit’s aluminum windings, 34 kVA rating, and WS39 weather shield simplify installation in harsh environments while offering compatibility with standard drive architectures.
Product Information
Extended Description
MD34E79B Eaton: Drive Isolation Transformer, Ventilated, Dry Type Distribution, DT-3, Three-phase, PV: 480 delta, Taps: 1 at +5% FCAN, 1 at -5% FCBN, SV: 480Y/277, 80°C, 34 kVA, Al windings, Frame: 914D, uses WS39
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD34E79B
UPC
786680057533
Product Length/Depth
22 in
Product Height
39 in
Product Width
29 in
Product Weight
505 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
914D
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
480 V
Secondary Voltage
480Y/277 V
Temperature rise
80 °C rise
Volt ampere rating
34 kVA
Weathershield
WS39
Feature: Dry-type DT-3 construction with ventilated cooling supports safe operation in dry, indoor or semi-outdoor environments. Business Impact: Reduces fire risk and maintenance complexity while delivering reliable performance in automation halls. Application: Suitable for robust drive isolation in packaging lines and manufacturing cells. Feature: Three-phase 480 V primary to 480Y/277 V secondary with 34 kVA rating. Business Impact: Enables efficient power transfer for medium-sized motor drives while maintaining voltage integrity. Application: CNCs, conveyors, and auxiliary drives in automated facilities. Feature: Tap changes at +5% FCAN and -5% FCBN. Business Impact: Improves voltage regulation amid supply fluctuations, reducing motor stress and extending component life. Application: Plants with variable line conditions or remote substations. Feature: Frame 914D with WS39 Weathershield and ventilation. Business Impact: Facilitates easier installation in tight spaces and enhances protection against dust and moisture, lowering indoor maintenance. Application: Industrial warehouses, outdoor bays, and control rooms. Feature: Aluminum windings and 80 °C rise rating. Business Impact: Enhances efficiency and thermal performance for continuous operation, improving overall system uptime. Application: Heavy automation environments with ambient heat variations. Feature: UL Listed and documented warranty. Business Impact: Provides vendor safety assurance and predictable support terms, reducing procurement risk. Application: End-user procurement and compliance-heavy installations along with service planning.
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FAQs
MD34E79B requires a ventilated, dry environment typical of dry-type transformers. Ensure adequate clearance for cooling, access to the WS39 weather shield, and proper mounting on a solid base compatible with the 914D frame. Provide 480 V delta input and 480Y/277 V secondary wiring with appropriate protective relays and local disconnects. Maintain compliance with local electrical codes and Eaton installation guidelines for safe, long-term operation.
The 34 kVA rating defines the transformer’s apparent power capacity, enabling reliable isolation for medium-sized motor drives without overheating. In practice, this supports stable voltage delivery to drives during startup and load changes, reducing voltage sags and EMI. For production lines, this can translate to smoother motor starts, lower transient-related wear, and improved overall uptime with predictable performance under peak loads.
Yes. MD34E79B is designed with a 480 V primary in a delta configuration and a 480Y/277 V secondary, aligning with common North American motor-drive architectures. This compatibility supports direct integration with standard drive systems, reduces the need for auxiliary impedance networks, and simplifies wiring schemes for controls and protection circuits in automated lines.
MD34E79B carries UL Listed certification, indicating compliance with established electrical safety standards for industrial equipment. This certification helps streamline procurement, safety audits, and regulatory acceptance in most manufacturing environments. Ensure all installation and maintenance practices align with the UL-listed use cases to maintain ongoing compliance.
Eaton provides a one-year warranty from the date of installation or eighteen months from shipment, whichever comes first, under policy 25-000. Routine maintenance includes checking ventilation, inspecting the WS39 shield, and verifying tap settings. Regular inspection of winding insulation and cooling paths helps sustain performance, minimize unplanned downtime, and protect return-on-investment over the transformer’s service life.