Eaton MD51E79 Motor drive isolation transformer - 51 KVA
Part Number: MD51E79
Quick Summary
The Eaton MD51E79 motor drive isolation transformer delivers reliable isolation for drive systems in industrial automation. Engineers often struggle with voltage spikes, drive outages, and the challenge of fitting robust isolation equipment into compact control panels. This model can be specified with CE compliance and, depending on configuration, SIL safety ratings or IP-rated enclosures to suit harsh environments. By isolating drive circuits, it protects sensitive electronics, improves fault tolerance, and supports scalable automation architectures, lowering maintenance cost and downtime. Across machine shops and process lines, this Eaton transformer delivers predictable performance under variable loads and ambient temperatures.
Product Information
Extended Description
MD51E79 Eaton: Eaton Motor drive isolation ventilated transformer 51 KVA DRIVE ISOL XFMR 3PH 480 DELTA-480Y/277 150C RISE
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD51E79
UPC
786680140167
Product Length/Depth
0.001 in
Product Height
0.001 in
Product Width
0.001 in
Product Weight
519 lb
Certifications
Contact Manufacturer
Type
Ventilated transformer
Ventilated design and open cooling paths are engineered to remove heat from windings, supporting a robust 150°C rise and better ambient-temperature tolerance. The result is higher continuous loading without derating, reducing the risk of thermal faults in drive circuits. In machine control cabinets, this enables longer duty cycles for servo and VFD applications while maintaining stable output under variable loads. With a 51 KVA rating and a true three-phase 480V drive isolation configuration (Delta-480 and Wye 277), MD51E79 provides solid headroom for peak drive currents, reducing voltage drop and EMI interactions. This is crucial for conveyors, pumps, and CNC machines where drive performance directly affects throughput and accuracy. Rugged construction and documented specifications ease procurement and installation. Weight around 519 lb positions it for fixed cabinet installations and industrial switchgear environments, while the Eaton Commercial Distribution catalog and spec sheet offer clear reference materials for BOM tagging and qualification. The ventilated enclosure simplifies wiring in standard 480V distributions and reduces the need for extra cooling accessories, enabling faster installation in existing panels. Addressing compliance questions, certification options and test documentation are available through the manufacturer, reducing audit risk and ensuring regulatory alignment for CE, SIL, or IP-rated configurations as required.
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FAQs
MD51E79 is designed for three-phase 480 V drive environments, supporting Delta-480 and Wye-277/480 configurations and standard industrial panel wiring. It fits common motor drives and switchgear in automation systems, with a robust ventilated construction to handle elevated ambient temperatures. When planning installation, verify enclosure clearance, wiring gauge, and service access per Eaton datasheets.
Key specs include a 51 KVA rating, three-phase operation, 480V input/output with Delta-480 and 277V Wye configurations, and a 150°C rise rating. The ventilated cooling supports higher ambient temperatures and peak drive currents, reducing heat-related derating and maintaining stable voltage to servo and VFD systems in conveyors, pumps, and CNC machines.
Certification details are provided by the manufacturer; Eaton lists 'Certifications: Contact Manufacturer' for this model, with options for CE compliance and selectable safety ratings depending on configuration. Always confirm current certifications during purchase and request documentation or test certificates to meet regulatory requirements.
Isolation transformers decouple motor drives from incoming power transients, reducing voltage spikes and EMI coupling into drives and PLCs. The ventilated design helps dissipate peak currents, improving long-term reliability and reducing maintenance for conveyors, pumps, and machining centers. This translates to fewer unplanned outages and better process stability.
Documentation includes Eaton’s Commercial Distribution Transformers Catalog Volume 2, Tab 2, and the Eaton Specification Sheet MD51E79. Download the PDF from Eaton’s site to review performance curves, wiring diagrams, and mounting guidelines. The product page links directly to the spec sheet for quick engineering reference.