Eaton MD34E90 Motor Drive Isolation Transformer - UL Listed
Part Number: MD34E90
Quick Summary
The Eaton MD34E90 motor drive isolation transformer provides clean, isolated power for three-phase motor drives in industrial controls. Power disturbances, voltage spikes, and grounding issues can cause nuisance tripping and reduced uptime in control panels. UL Listed safety certification supports reliable operation in plant environments and regulatory compliance. This dry-type, ventilated transformer uses WS38 protection and aluminum windings to deliver rugged performance in demanding conditions, while taps accommodate +5% and -5% voltage variation, helping stabilize drive voltage. By separating the drive electronics from the supply, it reduces electrical noise and protects sensitive components, enabling longer equipment life and lower maintenance costs for industrial automation systems.
Product Information
Extended Description
MD34E90 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, 34 kVA, Al windings, Frame: 912B, uses WS38
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD34E90
UPC
786680330919
Product Length/Depth
16.5 in
Product Height
30 in
Product Width
23 in
Product Weight
301 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
912B
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
34 kVA
Weathershield
WS38
Feature: Dry-Type, Ventilated DT-3 design indicates a safer, maintenance-friendly cooling approach. The ventilated, dry-type construction minimizes oil handling and leakage risk while delivering reliable heat removal in enclosed switchgear. This translates to lower maintenance intervals and reduced cooling requirements in factory control rooms, supporting compact enclosure designs and easier retrofits for aging automation architectures. Business Impact: Reduced risk of fluid leaks, lower lifecycle costs, improved uptime. Application: Ideal for indoor control panels and distribution cabinets in harsh industrial environments. Feature: 34 kVA rating with 230 V primary and 575Y/332 V secondary for three-phase distribution. Impact: Provides robust drive isolation and voltage transformation to stabilize motor drive inputs, minimizing waveform distortion and nuisance trips. Application: Suitable for motor drives, drives-in-dispensation panels, and industrial automation layouts requiring reliable power conditioning. Feature: Tap size options of 1 at +5% FCAN and 1 at -5% FCBN. Impact: Enables on-site voltage regulation to accommodate supply variations without external regulators. Application: Plants with marginal or fluctuating utility voltage looking to maintain drive performance. Feature: Aluminum windings and 150°C temperature rise with a rugged 912B frame. Impact: Enhances thermal endurance and durability in high ambient temperatures, reducing hot spots and extending service life. Application: Heavy-duty production floors and process lines with demanding ambient conditions. Feature: Weathershield WS38 compatibility and dry-type distribution design. Impact: Improves environmental protection and installation versatility in controlled environments and semi-exposed spaces. Application: Control rooms, switchgear housings, and distribution cabinets needing durable, code-compliant transformers. Feature: UL Listed certification and one-year warranty (or 18 months from shipment). Impact: Provides validated safety compliance and predictable procurement risk management, supporting faster approvals and reduced ownership costs. Application: Procurement decisions in regulated industries seeking certified, supported power isolation solutions.
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FAQs
MD34E90 is a three-phase drive isolation transformer with a 230 V primary and 575Y/332 V secondary, designed to plug into standard control cabinets and motor control centers. Its DT-3 dry-type construction and WS38 protection simplify integration with common drive architectures, while aluminum windings and the 912B frame support robust mounting in tight spaces.
Key specs include 34 kVA rated power, 60 Hz operation, 230 V primary, 575Y/332 V secondary, and a 150 °C rise rating. The +5% and -5% taps help maintain drive voltage under supply fluctuations. Together, these features improve drive stability, reduce nuisance tripping, and enhance overall system performance in industrial automation environments.
Yes. The dry-type construction, aluminum windings, and WS38 protection make the MD34E90 appropriate for indoor control panels and distribution cabinets in demanding industrial settings. Its 150 °C rise rating provides margin in hot plant areas, while the DT-3 design supports reliable operation without oil-filled components.
The MD34E90 carries UL Listed certification, indicating adherence to recognized safety standards for electrical equipment. This helps accelerate procurement approvals, reduces regulatory risk, and aligns with industry best practices for protecting personnel and equipment in manufacturing environments.
Maintenance is typically lower due to the dry-type design and sealed windings, with fewer oil-related concerns. The transformer provides reliable drive isolation, reducing downtime and extending motor life, which translates to lower maintenance costs and a favorable return on investment over time in automation and manufacturing operations.