Eaton MD34D75 Motor Drive Isolation Transformer - UL Listed
Part Number: MD34D75
Quick Summary
The Eaton MD34D75 motor drive isolation transformer provides clean, isolated power for large three-phase drive systems in manufacturing and processing environments. In the field, voltage transients and motor-drive harmonics can cause insulation wear, drive faults, and unplanned downtime.UL Listed safety certification, the DT-3 dry-type construction, and WS38 weather shield support versatile indoor and outdoor installation while enhancing safety and reliability. This transformer delivers reliable voltage regulation from 460 V to 400Y/231 V, aligning with industry standards and enabling safer, more predictable motor drive performance. By combining robust protection with easy maintenance, it offers tangible business value for equipment uptime and operational efficiency.
Product Information
Extended Description
MD34D75 Eaton: Drive Isolation Transformer, Ventilated, Dry Type Distribution, DT-3, Three-phase, PV: 460 delta, Taps: 2 at +2.5% FCAN, 2 at -2.5% FCBN, SV: 400Y/231, 150°C, 34 kVA, Al windings, Frame: 912B, uses WS38
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD34D75
UPC
786680061110
Product Length/Depth
16.5 in
Product Height
30 in
Product Width
23 in
Product Weight
334 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
2 at +2.5% FCAN, 2 at -2.5% FCBN
Type
Dry Type Distribution, Drive Isolation Transformer
Frequency rating
60 Hz
Phase
Three-phase
Primary voltage
460 V
Secondary Voltage
400Y/231 V
Temperature rise
150 °C rise
Volt ampere rating
34 kVA
Weathershield
WS38
Feature: 34 kVA three-phase rating provides solid headroom for motor drive loads; Business Impact: supports stable drive operation and protects upstream equipment from overloads; Application: suitable for packaging lines, conveyors, and industrial automation cells. Feature: 460 V primary to 400Y/231 V secondary with 60 Hz compatibility; Business Impact: ensures compatible voltage transformation for standard drive systems; Application: integrates with common motor drives used in plants. Feature: Tap changes with 2 at +2.5% FCAN and 2 at -2.5% FCBN; Business Impact: enables fine voltage regulation to compensate site swings; Application: ideal where incoming supply fluctuates. Feature: Ventilated, dry-type DT-3 design with aluminum windings; Business Impact: improves cooling and safety while reducing maintenance downtime; Application: indoor installations and protected outdoor enclosures with WS38 shield option. Feature: Frame 912B, size 16.5 in x 23 in x 30 in and weight 334 lb; Business Impact: straightforward mounting and fit within standard electrical rooms or panel spaces; Application: retrofit or new builds in industrial facilities. Feature: UL Listed certification; Business Impact: supports compliant installations and streamlined audits; Application: compliant with electrical safety standards across industrial sites. Feature: WS38 Weathershield option; Business Impact: expands outdoor deployment potential without sacrificing cooling; Application: outdoor or semi-exposed drive rooms in harsh environments.
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FAQs
For reliable operation, mount the MD34D75 in a ventilated space or enclosure suitable for a dry-type transformer. Ensure adequate clearance for cooling, access to connections, and proper grounding. The WS38 weather shield option supports outdoor or semi-exposed installation, while the 16.5 in depth, 23 in width, and 30 in height fit typical equipment rooms and standard racks. Consider servo-driven equipment loading and neighborhood harmonics when locating the unit to minimize interference.
Key specs include a 34 kVA three-phase rating with a 460 V primary and 400Y/231 V secondary, operating at 60 Hz. Voltage taps are 2 at +2.5% FCAN and 2 at -2.5% FCBN to handle site swings. The design uses aluminum windings and a DT-3 dry-type construction, with a 912B frame. This makes it compatible with common industrial motor drives and standard distribution equipment in new or retrofit projects.
Yes, with the WS38 Weathershield option, the MD34D75 is engineered for safer operation in harsher environments or semi-exposed locations. The dry-type DT-3 design further reduces fire and oil-related risks compared to oil-filled transformers, and the ventilated construction helps maintain cooler operating temperatures. Always verify enclosure protection and local environmental conditions to ensure optimal performance.
MD34D75 is UL Listed, indicating compliance with recognized safety standards for electrical equipment. This certification supports safer installation, reduces compliance risk, and simplifies inspections for industrial facilities. While UL Listed is the primary certification noted, confirm with local regulations for additional requirements such as CE or IP ratings if your project demands them.
Using the MD34D75 reduces drive downtime by delivering clean, isolated power that mitigates voltage transients and harmonics often seen in motor drives. The dry-type design lowers maintenance costs and eliminates oil-related concerns, while the robust 34 kVA rating supports longer motor life and reduced fault rates. Over time, these factors translate to lower maintenance spending and improved production uptime.