Eaton MD34E91 Motor drive isolation transformer - UL Listed
Part Number: MD34E91
Quick Summary
MD34E91 motor drive isolation transformer is a robust, three-phase solution for isolating power to industrial motor drives and control panels. In demanding manufacturing environments, voltage sags and transients can trigger drive faults and unplanned downtime, making reliable isolation essential. This unit carries UL Listed certification and is designed as a DT-3 dry-type distribution transformer with aluminum windings and a 150°C rise, providing safe operation in compact spaces. By separating the drive electronics from the source, it reduces switchgear stress and helps extend equipment life. For system integrators and maintenance teams, the combination of a 34 kVA rating, standard frame size, and flexible taps supports faster installations and predictable performance in new or retrofit projects.
Product Information
Extended Description
MD34E91 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, 34 kVA, Al windings, Frame: 912B, uses WS38
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD34E91
UPC
786849903589
Product Length/Depth
16.5 in
Product Height
30 in
Product Width
23 in
Product Weight
340 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
230Y/133 V
Temperature rise
150 °C rise
Volt ampere rating
34 kVA
Weathershield
WS38
Dry-type DT-3 construction plus ventilated cooling reduces enclosure requirements and simplifies installation in damp or dusty plant environments. This design minimizes enclosure heat load and enables safer siting near motor controllers, ideal for control panels and switchgear in manufacturing lines. Primary and secondary voltage arrangement of 460 V delta primary and 230Y/133 V secondary with taps at +5% and -5% FCAN/FCBN provides flexible loading and improved transient response for motor drives, servo supplies, and control circuits. With a 34 kVA rating at 60 Hz and a 150°C rise, the transformer maintains performance under peak loads, reducing downtime and extending drive life in demanding production lines. Aluminum windings and WS38 weather shield offer corrosion resistance and reliability in outdoor or harsh indoor settings, while the 912B frame and ventilated design ease installation in standard industrial enclosures. The compact 16.5 in length, 23 in width, and 30 in height footprint, plus a 340 lb weight, support straightforward panel integration and service access. UL Listed certification and Eaton warranty enhance compliance confidence and long-term service planning for panel builders and OEMs.
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FAQs
MD34E91 integrates with standard 912B frame enclosures and weighs about 340 lb, making it suitable for load centers and control panels. Its ventilated, dry-type DT-3 design reduces enclosure heat load and simplifies cooling in dusty or humid plant environments. Plan for access to the 16.5 in L x 23 in W x 30 in H footprint and ensure room for the +5% and -5% tap adjustments.
Key specs include three-phase operation at 60 Hz with a 34 kVA rating, primary voltage of 460 V (delta), secondary voltage of 230Y/133 V, and taps at +5% FCAN and -5% FCBN. Coil material is Aluminum, with a DT-3 dry-type design and WS38 weather shield. Frame 912B supports installation in common industrial environments.
Yes. The device provides drive isolation and transient protection for industrial motor drives, reducing electrical stress on drives and downstream control hardware. Its 34 kVA rating supports robust drive loads, and the dry-type DT-3 construction with ventilated cooling suits temperate to harsh production floors while maintaining safety and reliability.
MD34E91 carries UL Listed certification, confirming compliance with established electrical safety standards for industrial transformers. This certification supports safer installation practices, smoother regulatory approvals for panels, and greater confidence in long-term reliability within manufacturing environments.
Eaton provides a one-year warranty from installation or eighteen months from shipment, whichever occurs first, under policy 25-000. This coverage aligns with typical industrial product expectations and supports planned maintenance programs and lifecycle cost planning for OEMs and maintenance teams.