Eaton MD51E90 Drive Isolation Transformer - UL Listed
Part Number: MD51E90
Quick Summary
The Eaton MD51E90 is a drive isolation transformer that protects motor drives in industrial power systems. Engineers face voltage spikes, electrical noise, and drive faults that slow or halt production; isolation transformers mitigate these risks and extend equipment life. UL Listed certification validates safety and reliability, while the DT-3 dry-type design and ventilated WS39 housing enhance cooling and installation flexibility in harsh environments. This 51 kVA unit uses aluminum windings with a 914D frame to provide robust isolation between a 230 V primary and a 575Y/332 V secondary, suitable for demanding, continuous-duty applications. Its three-phase config and reinforced construction translate to improved uptime and predictable performance in manufacturing and processing lines.
Product Information
Extended Description
MD51E90 Eaton: Drive Isolation Transformer, Ventilated, Dry Type Distribution, DT-3, Three-phase, PV: 230 delta, Taps: 1 at +5% FCAN, 1 at -5% FCBN, SV: 575Y/332V, 150°C, 51 kVA, Al windings, Frame: 914D, uses WS39
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD51E90
UPC
786680330957
Product Length/Depth
22 in
Product Height
39 in
Product Width
29 in
Product Weight
536 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
914D
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
230 V
Secondary Voltage
575Y/332 V
Temperature rise
150 °C rise
Volt ampere rating
51 kVA
Weathershield
WS39
Feature: DT-3 dry-type insulation with aluminum windings delivers a compact, oil-free design that reduces fire risk and simplifies preventive maintenance. Business impact: lower total cost of ownership and safer facility operations. Application: ideal for factory floors and switchgear assemblies where oil-free cooling and robust isolation are critical. Feature: Ventilated construction aided by WS39 weather shield enhances cooling capacity and thermal margin. Business impact: increased uptime under heavy or sustained loads and better performance in higher ambient temperatures. Application: suitable for rugged indoor environments and outdoor installations where moisture or dust exposure is a concern. Feature: Tap settings with 1 at +5% FCAN and 1 at -5% FCBN enable precise voltage regulation. Business impact: improved voltage stability for sensitive motor drives and reduced nuisance tripping. Application: sites with fluctuating utility voltages or grid disturbances. Feature: Three-phase 60 Hz operation at 51 kVA with primary 230 V and secondary 575Y/332 V provides robust drive isolation for large motors. Business impact: supports high inrush and peak load requirements, enabling smoother startup and reduced electrical stress. Application: conveyor systems, pumps, and process equipment. Feature: Frame 914D with documented dimensions (22 in L, 39 in H, 29 in W) and 536 lb weight ensures clear space planning and secure mounting. Business impact: easier installation, compatible panel integration, and predictable support requirements. Application: factory assemblies, switchgear rooms, and dedicated drive enclosures. Feature: UL Listed certification and a standard warranty provide safety assurance and post-sale support. Business impact: procurement compliance with electrical safety standards and lower risk for sustaining operations. Application: corporate QA approvals and maintenance planning in regulated environments.
Get a Quick Quote for a Eaton MD51E90
Chat with us on WhatsApp - fast responses guaranteed
Need to speak with someone? We'll call you back within 2 hours during business hours
Interested in Eaton MD51E90?
Enquire Now
FAQs
The MD51E90 uses a 914D frame and weighs 536 lb, with dimensions of 22 in L, 39 in H, and 29 in W. Plan for adequate clearance for ventilation, access to taps, and cable entry. The WS39 weather shield supports more demanding environments, and the oil-free dry-type design simplifies compliance with indoor safety codes. Ensure mounting hardware matches the frame and provide ambient cooling to sustain the 150 C rise rating under peak loads.
Key specs: three-phase, 60 Hz, primary 230 V, secondary 575Y/332 V, 51 kVA rating, aluminum windings, DT-3 dry-type. Tap settings include one at +5% FCAN and one at -5% FCBN to accommodate voltage variations. These taps help maintain motor drive stability under grid fluctuations, reducing tripping and improving performance for sensitive loads.
Yes. The MD51E90 is designed for drive isolation in industrial power systems, delivering voltage separation and noise suppression for three-phase motor drives. Its dry-type construction reduces fire risk, while the 51 kVA rating supports substantial drive inrush and peak loads. It is well-suited for conveyors, pumps, and process equipment where drive uptime and clean power are critical.
The product is UL Listed, indicating compliance with recognized safety standards for electrical equipment. While other region-specific certifications (such as CE) are not listed, the transformer’s design (dry-type, ventilated, DT-3) and mounting frame are aligned with common industrial safety and installation practices. Verify site requirements and integrate with Eaton installation guidelines for compliant deployment.
Maintenance focuses on general electrical inspections, verifying tap settings, and ensuring ventilation remains unobstructed. The dry-type design eliminates oil handling, reducing fire hazard and spill risk, which lowers maintenance overhead. ROI benefits come from improved drive uptime, reduced fault propagation, and safer operation, especially in high-demand manufacturing environments where consistent motor-drive performance matters.