Eaton MD34E99 Motor drive isolation transformer - UL Listed
Part Number: MD34E99
Quick Summary
Eaton MD34E99 Motor drive isolation transformer delivers reliable power isolation for three-phase motor drives across manufacturing lines. In demanding environments, voltage transients and EMI can trigger drive faults and downtime, making isolation essential. The DT-3 design with aluminum windings, a 34 kVA rating, and a 150°C rise supports consistent performance under load. UL Listed safety certification, a NEMA 2 enclosure, and the WS38 weather shield protect equipment in damp and wash-down areas. This solution also improves maintenance predictability and efficiency by providing clean, matched 480V outputs. For engineers, it pairs well with modern VFDs and automation controllers, supporting plug-in compatibility and straightforward installation, reducing lifecycle costs.
Product Information
Extended Description
MD34E99 Eaton: Motor drive isolation transformer, DT-3, Three-phase, Primary voltage: 480V, Taps: 1 at +5% FCAN, 1 at -5% FCBN, Secondary voltage: 480V, 150°C, 34 kVA, Aluminum windings, FR912B, 300A, WS38, 60 Hz, NEMA 2
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD34E99
UPC
786680101915
Product Length/Depth
16.5 in
Product Height
30 in
Product Width
23 in
Product Weight
329 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
Enclosure
NEMA 2
Frame
912B
Tap size
1 at +5% FCAN, 1 at -5% FCBN
Type
Motor drive isolation transformer
Wiring connection
300A
Frequency rating
60 Hz
Phase
Three-phase
Primary voltage
480 V
Secondary Voltage
480 V
Temperature rise
150 °C rise
Volt ampere rating
34 kVA
Weathershield
WS38
Feature → Business Impact → Application: The DT-3 ventilated design combined with a NEMA 2 enclosure reduces heat buildup and environmental ingress, lowering drive fault rates in harsh plant environments. This leads to higher line availability and lower maintenance costs for automated production lines and packaging systems. Feature → Business Impact → Application: A 34 kVA rating supports startup and peak-load demands of multi-motor drives, enabling conveyors, pumps, and fans to operate reliably without oversizing power infrastructure. Feature → Business Impact → Application: Tap settings at +5% FCAN and -5% FCBN allow voltage regulation to maintain precise drive voltage under supply variations, reducing controller trips and improving control stability in facilities with fluctuating service. Feature → Business Impact → Application: Aluminum windings and a robust 150°C rise rating deliver durable performance in frequent start/stop applications, translating to longer transformer life and lower spare-part usage for automation projects. Feature → Business Impact → Application: WS38 weather shield and UL Listing simplify compliance and outdoor or damp-area installations, while the compact footprint and 329 lb (approx.) weight support straightforward mounting and service access in existing switchgear. Feature → Business Impact → Application: The 912B frame and 60 Hz three-phase configuration enable plug‑and‑play compatibility with common motor drives and automation controllers, reducing engineering effort and accelerating project timelines.
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FAQs
The MD34E99 should be mounted in a compliant enclosure (NEMA 2) with proper clearances for ventilation. Connect the 480 V primary and 480 V secondary per the DT-3 design, observe the +5% and -5% taps to regulate output under voltage variations, and verify mounting orientation that allows drainage and accessibility for 300 A wiring connections. Ensure UL Listed installation practices and maintain required clearances to maximize protection and service life.
Key specs include a 34 kVA rating, three-phase operation at 60 Hz, primary 480 V and secondary 480 V, aluminum coil windings, DT-3 design, and a 150 °C temperature rise. It uses a NEMA 2 enclosure with WS38 weather shield and supports voltage regulation via taps at +5% FCAN and -5% FCBN, suitable for demanding drive applications.
Yes. The MD34E99 is designed to isolate motor drives from supply disturbances, improving power quality and drive reliability in automation lines, conveyors, pumps, and process equipment. Its ventilated DT-3 design, aluminum windings, and sturdy enclosure support durable operation in typical factory environments while maintaining clean 480V outputs for sensitive controls.
This transformer is UL Listed for electrical safety and is housed in a rugged NEMA 2 enclosure with WS38 weather shield for damp or wash-down areas. The combination of UL listing, rugged construction, and documented warranties supports regulatory compliance and reduces risk in regulated industrial environments.
With a robust 34 kVA rating, long-term aluminum winding durability, and a protective enclosure, the MD34E99 minimizes downtime and spare-parts usage. The warranty policy provides coverage against defects, while the UL-listed, durable design lowers lifecycle costs by reducing unscheduled maintenance and extending drive life in high-demand production environments.