Eaton MD93E85 Motor drive isolation transformer - UL Listed
Part Number: MD93E85
Quick Summary
The Eaton MD93E85 motor drive isolation transformer provides clean, isolated power for drive systems in industrial applications. It reduces voltage fluctuations and startup surges that can trigger faults or wear in motors and drives. UL Listed certification underlines safety compliance for dry-type drive isolation transformers, while the DT-3 design and WS39 weather shield enhance reliability in varied plant environments. This model supports 60 Hz operation with a 93 kVA rating and 208 V primary, delivering stable secondary voltage of 230Y/133 V. By accommodating voltage taps and robust aluminum windings, it helps maintain informed downtime planning and lower maintenance costs for OEMs and end users.
Product Information
Extended Description
MD93E85 Eaton: Drive Isolation Transformer, Ventilated, Dry Type Distribution, DT-3, Three-phase, PV: 208V, Taps: 1 at +5% FCAN, 1 at -5% FCBN, SV: 230Y/133V, 150°C, 93 kVA, Al windings, Frame: 915D, uses WS39
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD93E85
UPC
786680001291
Product Length/Depth
22 in
Product Height
39 in
Product Width
29 in
Product Weight
600 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
915D
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
208 V
Secondary Voltage
230Y/133 V
Temperature rise
150 °C rise
Volt ampere rating
93 kVA
Weathershield
WS39
Feature: Drive isolation protects downstream motor drives from transients and voltage spikes. Business Impact: Reduces drive faults, extends motor life, and lowers unplanned downtime. Application: Suitable for motor control centers and panel boards in steel, chemical, and packaging facilities. Feature: Ventilated, dry-type construction (WS39) with aluminum windings. Business Impact: Eliminates oil-related fire risk, improves heat dissipation, and simplifies maintenance in confined electrical rooms. Application: Indoor and semi-outdoor installations where safety and reliability matter. Feature: Three-phase, 208 V primary with 230Y/133 V secondary. Business Impact: Enables seamless integration with common plant power and motor loads, reducing rewiring and interface issues. Application: Industrial drive applications requiring consistent secondary voltage for motor starting and control. Feature: Voltage taps at +5% and -5% FCAN/FCBN. Business Impact: Maintains motor performance during input variability, reducing overheating and energy waste. Application: Facilities with fluctuating utility feeds or variable frequency drives. Feature: 93 kVA rating with 150°C rise and frame 915D. Business Impact: Handles robust load demands with high-temperature tolerance, supporting dense electrical layouts. Application: Large drive systems and retrofit projects where footprint and capacity matter. Feature: Weathershield WS39 and aluminum windings meet demanding environments. Business Impact: Offers durable service in moderate outdoor exposure and harsh plant areas, increasing uptime. Application: Outdoor yards, comissioning bays, and production floors with variable ambient conditions. Feature: Warranty and safety compliance. Business Impact: Provides peace of mind and predictable maintenance budgeting through a one-year warranty (or 18 months from shipment) and UL Listed safety. Application: OEMs and end users seeking recognized safety assurances for critical power components.
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FAQs
MD93E85 is designed as a dry-type drive isolation transformer with a 915D frame footprint and 93 kVA rating, making it compatible with standard industrial drive cabinets and motor control enclosures. When planning retrofit, verify mounting clearances, venting requirements for WS39, and available space for the compact footprint relative to existing busways and ductwork.
Key specs include three-phase operation at 60 Hz, primary 208 V, secondary 230Y/133 V, 93 kVA VA rating, aluminum windings, DT-3 design, and an aluminum frame 915D. Tap settings are +5% FCAN and -5% FCBN. The transformer is vented for dry-type cooling and has a 150°C rise rating, with WS39 weather shielding.
Yes. With a 93 kVA rating, DT-3 dry-type construction, and a robust 150°C rise capability, the MD93E85 is well-suited for demanding drive isolation needs in manufacturing environments. Its 208 V to 230Y/133 V conversion supports typical motor loads, and the +5%/−5% taps help maintain performance under grid variability.
MD93E85 carries UL Listed certification, indicating compliance with essential electrical safety standards for dry-type distribution transformers. This certification supports safety and regulatory due diligence during procurement and in audit-ready documentation for electrical rooms and maintenance records.
The MD93E85 includes a one-year warranty from installation or 18 months from shipment, whichever comes first. Being oil-free and vented simplifies maintenance and lowers fire-safety considerations compared with oil-filled transformers. Regular inspections should focus on venting, enclosure integrity, and terminal connections.