Eaton MD20E88ZZ Open Core-Coil Transformer - UL Recognized
Part Number: MD20E88ZZ
Quick Summary
The Eaton MD20E88ZZ open core-coil ventilated transformer provides dependable drive isolation for industrial power systems. This 20 kVA, three-phase dry-type transformer integrates an open core and coil assembly, aluminum windings, and a DT-3 design to maximize cooling in ventilated environments. End-users often wrestle with heat buildup and limited service access in compact plant footprints; this unit specifically addresses those challenges with a rugged 910S frame and accessible taps at +5% and -5% FCAN/FCBN for on-site voltage adjustments. UL Recognized for safety conformity, the transformer supports compliant installations in control panels and distribution gear. By combining reliability with installation flexibility and a clear warranty, it helps reduce downtime, lower lifecycle costs, and streamline procurement for motor-control and plant-power systems.
Product Information
Extended Description
MD20E88ZZ 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: 230Y/133V, 150°C, 20 kVA, Al windings, Frame: 910S
Product Name
Eaton Open core-coil ventilated transformer
Catalog Number
MD20E88ZZ
UPC
786680055362
Product Length/Depth
14.12 in
Product Height
30 in
Product Width
20.12 in
Product Weight
270 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 Recognized
Catalog Notes
Open type core and coil assembly
Coil material
Aluminum
Design
DT-3
Frame
910S
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
230Y/133 V
Temperature rise
150 °C rise
Volt ampere rating
20 kVA
Feature: Open core-coil ventilated design enables superior convection cooling in crowded electrical rooms. Business Impact: Reduces heat-related losses, extends component life, and minimizes derating in high-load applications. Application: Ideal for open-type installations in motor-control centers requiring robust drive isolation and easy access for maintenance.
Feature: 20 kVA three-phase rating with 230 V primary and 230Y/133 V secondary provides versatile voltage conversion for plant power distribution. Business Impact: Supports tight voltage regulation and compatibility with common industrial motors and controls, lowering wiring complexity and spare-part counts. Application: Suitable for factory floors and control panels where reliable power isolation improves system stability.
Feature: DT-3 design, 910S frame, and aluminum windings deliver durability in harsh environments. Business Impact: Combines rugged construction with lightweight handling, reducing installation time and crane/rigging requirements. Application: Fits open-frame installations in demanding industrial spaces.
Feature: Tap settings (+5% FCAN, -5% FCBN) offer on-site voltage adjustment to accommodate supply variation. Business Impact: Improves system efficiency and reduces equipment stress by maintaining target voltages. Application: Beneficial in factories with fluctuating power quality or multi-zone distributions.
Feature: UL Recognized certification and open-type core-coil assembly support compliant procurement and safer integration. Business Impact: Accelerates approval cycles and ensures safety standards alignment. Application: Suitable for control cabinets, distribution gear, and motor-control architectures requiring certified components.
Feature: 20 kVA three-phase rating with 230 V primary and 230Y/133 V secondary provides versatile voltage conversion for plant power distribution. Business Impact: Supports tight voltage regulation and compatibility with common industrial motors and controls, lowering wiring complexity and spare-part counts. Application: Suitable for factory floors and control panels where reliable power isolation improves system stability.
Feature: DT-3 design, 910S frame, and aluminum windings deliver durability in harsh environments. Business Impact: Combines rugged construction with lightweight handling, reducing installation time and crane/rigging requirements. Application: Fits open-frame installations in demanding industrial spaces.
Feature: Tap settings (+5% FCAN, -5% FCBN) offer on-site voltage adjustment to accommodate supply variation. Business Impact: Improves system efficiency and reduces equipment stress by maintaining target voltages. Application: Beneficial in factories with fluctuating power quality or multi-zone distributions.
Feature: UL Recognized certification and open-type core-coil assembly support compliant procurement and safer integration. Business Impact: Accelerates approval cycles and ensures safety standards alignment. Application: Suitable for control cabinets, distribution gear, and motor-control architectures requiring certified components.
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FAQs
When installing the MD20E88ZZ, ensure adequate ventilation around the open-core assembly to maximize cooling. Verify floor loading for the 270 lb unit and accommodate the 14.12 in depth, 20.12 in width, and 30 in height within the enclosure or switchgear. Use the built-in +5% and -5% taps to fine-tune voltage under load, and confirm UL Recognized compliance with local electrical codes.
The 230 V primary supports standard industrial supply configurations, while the 230Y/133 V secondary enables versatile Open Delta-like distribution to power a variety of downstream equipment. In practice, this reduces wiring complexity, improves voltage regulation under motor starting, and supports unified control panels. Design considerations include respecting the 60 Hz frequency and ensuring compatible protections for three-phase loads.
Yes. With a 20 kVA rating and drive-isolation capability, the MD20E88ZZ provides electrical separation between power and control circuits, reducing motor-drive noise and preventing control disturbances. Its aluminum windings and DT-3 design support efficient cooling in centralized MCC environments, while the 910S frame aids mounting within standard enclosures.
The MD20E88ZZ carries UL Recognized certification, indicating compliance with recognized safety standards for electrical components. This supports safer integration into control panels and distribution gear. Always verify local regulatory applicability and any additional certifications required for your industry or region, but UL recognition is a strong baseline for industrial equipment.
Maintenance focuses on periodic inspection of the open-core assembly for dust buildup, checking winding connections, and confirming tap settings remain within tolerance. The transformer’s rugged aluminum windings and ventilated design reduce thermal stress, contributing to longer service life and lower maintenance costs. ROI improves through reduced downtime, improved system reliability, and streamlined installation in motor-control deployments.