Eaton MD75E79CU Drive isolation transformer - UL Listed
Part Number: MD75E79CU
Quick Summary
Eaton MD75E79CU Drive isolation transformer is a robust solution for protecting motor drives in industrial automation. It stabilizes power and isolates downstream equipment from line disturbances to reduce downtime. UL Listed safety certification, a DT-3 dry-type design, and WS19 weather shielding support reliable operation in harsh plant environments. This unit pairs a 75 kVA rating with a 480 V primary and 480Y/277 V secondary, delivering predictable performance while enabling compliant, efficient drive systems and easier maintenance over the long term.
Product Information
Extended Description
MD75E79CU 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, 150°C, 75 kVA, Cu windings, Frame: 916A, uses WS19
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD75E79CU
UPC
786685266985
Product Length/Depth
23.42 in
Product Height
48.56 in
Product Width
28.22 in
Product Weight
873 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
Copper
Design
DT-3
Frame
916A
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
150 °C rise
Volt ampere rating
75 kVA
Weathershield
WS19
Feature: Three-phase 75 kVA rating and 60 Hz operation provide substantial load capacity for motor drives. Business Impact: Supports consistent power quality, reducing startup surges and transient events that can shorten drive life and trigger unplanned downtime. Application: Ideal for CNCs, packaging lines, and other high-demand motor applications in manufacturing facilities. Feature: 480 V primary and 480Y/277 V secondary voltages ensure compatibility with common industrial power distributions. Business Impact: Simplifies integration with existing switchgear and distribution networks, minimizing reconfiguration costs. Application: Suitable for retrofits or new installations in facilities using standard 480 V three-phase bussing. Feature: Dry-type, DT-3 design with vented construction and WS19 weather shield. Business Impact: Improves safety, reduces oil-related risks, and enables indoor/outdoor installation with environmental protection. Application: Environments where fire safety and protection from dust and moisture are critical. Feature: Copper windings and robust frame 916A deliver high conductivity and mechanical durability. Business Impact: Increases thermal efficiency, reduces copper losses, and extends transformer life in continuous-duty service. Application: Heavy-duty drive isolation in continuous process lines. Feature: Taps at +5% and -5% accommodate voltage fluctuations. Business Impact: Improves voltage stability for sensitive drives, reducing nuisance trips and control jitter. Application: Plants with marginal supply reliability or long feeder runs. Feature: WS19 weather shield, UL Listed certification, and factory warranty support reliability and compliance. Business Impact: Enhances environmental resilience, simplifies regulatory compliance, and provides a clear service roadmap. Application: Industrial floors with exposure to dust, moisture, or temperature variation.
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FAQs
MD75E79CU is a three-phase 75 kVA transformer with a 480 V primary and 480Y/277 V secondary. It integrates with standard 480 V distribution and motor drive setups. Ensure adequate clearance for ventilation, confirm WS19 weather shield suitability for the environment, and verify DT-3 dry-type construction aligns with indoor or outdoor installations.
Key specs include 75 kVA rating, 480 V primary, 480Y/277 V secondary, 60 Hz frequency, and a 150 °C rise rating. Copper windings improve efficiency, and the +5% / -5% taps allow voltage compensation to mitigate fluctuations, yielding smoother drive operation and reduced nuisance trips in variable supply conditions.
Yes, the MD75E79CU uses a DT-3 dry-type design with WS19 weather shield for environmental protection. It is UL Listed, ensuring compliance with safety standards for electrical equipment in industrial facilities and helping auditors verify proper installation and operation.
Warranty is Eaton’s standard 25-000 policy, offering one year from installation or eighteen months from shipment, whichever occurs first. For maintenance, rely on the dry-type design’s low oil risk, copper windings for durability, and access to Eaton technical support and updated datasheets for routine inspection checks.
The combination of a robust 75 kVA rating, durable copper windings, and a ventilated dry-type DT-3 design reduces energy losses and thermal stress while improving reliability. Voltage taps (+/-) help manage supply variability, minimizing downtime and extending drive life, resulting in lower maintenance and replacement costs over the system’s life.