Eaton MD550E91CU Motor drive isolation - UL Listed
Part Number: MD550E91CU
Quick Summary
The Eaton MD550E91CU motor drive isolation transformer provides safe, reliable voltage isolation for industrial drive systems. For engineers upgrading drives, issues like overheating, voltage transients, and downtime can derail projects; this unit’s ventilated, dry-type design helps minimize those risks while enabling safer maintenance. It carries UL Listed safety certification and is designed for 60 Hz three-phase operation, copper windings, and the DT-3 dry-type construction. With a 550 kVA rating, robust frame 919E, and WS35 weather shielding, it supports uptime and consistent performance in demanding environments. This combination of reliability, efficiency, and safety translates into tangible business value for motor-drive installations and distribution protection.
Product Information
Extended Description
MD550E91CU Eaton: Drive Isolation Transformer, Ventilated, Dry Type Distribution, DT-3, Three-phase, PV: 460 delta, Taps: 1 at +5% FCAN, 1 at -5% FCBN, SV: 230Y/133V, 150°C, 550 kVA, Cu windings, Frame: 919E, uses WS35
Product Name
Eaton Motor drive isolation ventilated transformer
Catalog Number
MD550E91CU
UPC
786680082733
Product Length/Depth
36.23 in
Product Height
75 in
Product Width
44.2 in
Product Weight
4053 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
Copper
Design
DT-3
Frame
919E
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
460 V
Secondary Voltage
230Y/133 V
Temperature rise
150 °C rise
Volt ampere rating
550 kVA
Weathershield
WS35
Commercial Distribution, Transformers, Volume 2, Tab 2
Eaton Specification Sheet - MD550E91CU
Selling Policy 25-000 - Distribution and Control Products and Services
Dry-type ventilation and the DT-3 design deliver safer operation and cooler running temperatures, reducing thermal stress on windings and extending service life in harsh environments. Business impact: lower maintenance costs and improved uptime for mission-critical drives. Application: manufacturing lines and packaging equipment where continuous motor operation is essential. The 550 kVA three-phase transformer with a 460 V primary and 230Y/133 V secondary provides seamless compatibility with standard industrial drives, minimizing wiring changes and enabling fast integration. Long-tail keywords: dry-type distribution transformer, 460 V to 230Y/133 V conversion, three-phase transformer for motor drives. Tap changers (+5% FCAN, -5% FCBN) preserve voltage stability under load fluctuations, reducing motor wear and control chatter. Business impact: improved voltage regulation and extended motor life; Application: CNC machines and conveyors with sensitive controls. Copper windings and frame 919E offer robust electrical and mechanical endurance, delivering consistent performance under peak loads. Business impact: lower thermal and electrical losses; Application: high-duty drive applications. WS35 weather shield enables external or outdoor installations, maintaining performance in challenging environments. Business impact: reduced enclosure costs and simplified site planning; Application: outdoor substations and exposed equipment. Warranty terms (25-000) and UL Listed certification reinforce safety and service commitments, aiding compliance in regulated facilities. Business impact: predictable service intervals and risk mitigation for capital projects; Application: compliance-driven plants seeking dependable transformer solutions.
Get a Quick Quote for a Eaton MD550E91CU
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 MD550E91CU?
Enquire Now
FAQs
Plan for clearance around the 919E frame, providing adequate ventilation for the ventilated dry-type design. Ensure mounting on a rigid surface with appropriate seismic and shock considerations, and allow access for maintenance and tap adjustments. Account for the 36.23 in depth, 44.2 in width, and 75 in height, plus the unit's 4053 lb weight when delivering clearance and crane access.
The MD550E91CU is a three-phase transformer rated at 550 kVA, with a primary of 460 V and a secondary of 230Y/133 V. It supports taps at +5% FCAN and -5% FCBN to accommodate voltage variations, enabling stable drive operation and reduced motor stress in variable supply conditions.
Yes. As a drive isolation transformer with copper windings in a DT-3 dry-type design, it provides voltage isolation and EMI suppression essential for motor drives, improving control stability and protecting sensitive electronics. Its three-phase configuration and 550 kVA rating support mid-to-large drive systems common in automation lines.
The MD550E91CU carries UL Listed certification, confirming safety compliance for industrial installations. Warranty is governed by Eaton Selling Policy 25-000, offering one year from installation or eighteen months from shipment, whichever occurs first, supporting service planning and asset protection.
Common concerns include size, weight, heat, and outdoor exposure. This unit’s WS35 weather shield aids outdoor suitability, the DT-3 dry-type construction facilitates ventilation and cooling, and the copper windings provide durable electrical performance. For weight and space, plan crane access and dedicated enclosure space, leveraging its 36.23 in depth, 44.2 in width, and 75 in height.