Eaton MD75D99CU Motor isolation transformer - UL Listed
Part Number: MD75D99CU
Quick Summary
The Eaton MD75D99CU motor isolation transformer delivers reliable power conditioning for three-phase drive systems in industrial automation. In harsh plant environments, voltage variations and heat can cause VFD faults or reduced motor life, making robust isolation essential. UL Listed safety certification ensures electrical safety compliance for safer installations, while Eaton’s DT-3 dry-type design favors maintenance-free operation in demanding spaces. The WS19 weather shield option extends protection in outdoor or harsh indoor environments, and the unit’s copper windings, 75 kVA rating, and 480 V input/output support reliable, scalable drive applications. This combination delivers improved equipment uptime and lower lifecycle costs for panel builders and end users.
Product Information
Extended Description
MD75D99CU Eaton: Drive Isolation Transformer, Ventilated, Dry Type Distribution, DT-3, Three-phase, PV: 480 delta, Taps: 2 at +2.5% FCAN, 2 at -2.5% FCBN, SV: 480 delta, 150°C, 75 kVA, Cu windings, Frame: 916A, uses WS19
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD75D99CU
UPC
786680087240
Product Length/Depth
23.42 in
Product Height
48.56 in
Product Width
28.22 in
Product Weight
838 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
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
480 V
Secondary Voltage
480 V
Temperature rise
150 °C rise
Volt ampere rating
75 kVA
Weathershield
WS19
Feature: Drive isolation with a 480 V primary and secondary creates a barrier against line transients and switching spikes. Business Impact: protects sensitive VFDs, reduces nuisance trips, and extends motor life, lowering maintenance costs. Application: ideal for motor control centers and conveyor drives in manufacturing lines. Feature: Ventilated, dry-type construction eliminates oil fire risk and simplifies compliance in crowded electrical rooms. Business Impact: safer operation with lower fire hazard and easier compliance testing. Application: indoor panel housings and outdoor enclosures when paired with WS19. Feature: DT-3 design with copper windings and a 75 kVA rating delivers robust performance under peak loads. Business Impact: high reliability and reduced downtime during start-up surges. Application: pumps, fans, and heavy-load drives. Feature: Tap settings at +2.5% and -2.5% enable precise voltage regulation. Business Impact: compensates for supply variations, preserving motor torque and drive efficiency. Application: sites with fluctuating grid voltages. Feature: Frame 916A and WS19 weather shield enhance fit and environmental protection. Business Impact: simplifies installation in space-constrained panels and harsh environments. Application: outdoor or wet-room control cabinets. Feature: UL Listed certification and a standard one-year warranty (or 18 months from shipment) reduce procurement risk. Business Impact: accelerates compliance and shortens project lead times. Application: procurement teams seeking reliable, certified transformers for motor drives.
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FAQs
Yes. The MD75D99CU is a three-phase, 480 V primary/secondary transformer designed for drive isolation in VFD-centric control panels. It uses a DT-3 dry-type design with a 916A frame and copper windings, and it supports compact mounting within standard 3-phase enclosures. For best results, mount it in a well-ventilated panel with WS19 protection when exposed to outdoor or damp environments.
Key specs include a 75 kVA rating, 60 Hz frequency, 480 V primary and secondary, copper windings, and a 150 °C rise rating. The taps provide ±2.5% regulation to compensate for voltage variations. These features minimize transients reaching the VFD, improve startup torque stability, and reduce fault rates in demanding drive applications.
The transformer excels in motor control centers, conveyors, pumps, and other heavy-load drive applications where drive isolation and voltage stability are critical. Its ventilated dry-type construction and WS19 weather shield enable reliable operation in challenging environments, including outdoor cabinets and humid plant rooms, while maintaining safe control-panel integration.
The MD75D99CU carries UL Listed certification, confirming compliance with essential electrical safety standards. It also arrives with Eaton’s warranty policy, offering one year from installation or eighteen months from shipment, whichever occurs first, reducing long-term ownership risk.
By delivering robust drive isolation and transient mitigation, the transformer reduces VFD faults and unplanned downtime. Copper windings and a dry-type design lower maintenance costs and fire risk. The 75 kVA rating supports scalable motor drives, while the WS19 shield and DT-3 construction simplify installation in rugged environments, delivering a favorable return on investment through improved reliability.