Eaton N48M28T55 K-Factor Transformer - UL Listed
Part Number: N48M28T55
Quick Summary
Eaton N48M28T55 K-Factor nonlinear ventilated transformer is designed for reliable three-phase power conditioning in heavy-industrial facilities. Engineers often struggle with transient impulses, thermal rise, and harmonic stresses that shorten transformer life and complicate maintenance. UL Listed, with aluminum windings, electrostatic shielding, and the K-13 design, it supports safety, efficiency, and compliance in demanding environments. With a 500 kVA rating, 480 V primary, and 208Y/120 V secondary, plus two taps at +2.5% and four taps at -2.5% for on-site voltage adaptation, it accommodates load variability. Used in data centers, manufacturing lines, and process control rooms, it helps reduce downtime, improve energy efficiency, and lower lifecycle costs for industrial networks.
Product Information
Extended Description
N48M28T55 Eaton: K-Factor nonlinear ventilated transformer K-13, Three-phase, PV: 480V, Taps: 2 at 0.025 FCAN, 4 at -0.025 FCBN, SV: 208Y/120V, 150°C, 500 kVA, Al windings, Elec. Shield, Frame: 922
Product Name
Eaton K-Factor nonlinear ventilated transformer
Catalog Number
N48M28T55
UPC
786680036637
Product Length/Depth
42.65 in
Product Height
90 in
Product Width
69.26 in
Product Weight
4730 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
Type
Ventilated transformer
Design
K-13
Frame
922
Tap size
2 at +2.5% FCAN, 4 at -2.5% FCBN
Frequency rating
60 Hz
Kva Rating
500 kVA
Phase
Three-phase
Primary voltage
480 V
Secondary Voltage
208Y/120 V
Temperature rise
150 °C rise
Special features
Electrostatically Shielded
Weathershield
WS36
Commercial Distribution, Transformers, Volume 2, Tab 2
Eaton's Transformer Flex Center
Eaton Specification Sheet - N48M28T55
Feature: Ventilated design enhances heat removal through natural convection and efficient cooling paths. Business Impact: Lower hot-spot temperature, higher continuous load capability, and reduced risk of thermal derating. Application: Data centers, automated manufacturing lines, and process control rooms requiring stable operation under variable ambient conditions. Feature: K-Factor nonlinear performance with a 150°C rise. Business Impact: Improved tolerance to non-linear loading and harmonic content, extending transformer life and reducing maintenance cycles. Application: Facilities with irregular loads, harmonics from VFDs, and transient plant events. Feature: Voltage taps with two at +2.5% and four at -2.5%. Business Impact: Simplified voltage matching on site, minimizing the need for additional equipment and field rewiring. Application: Installations subject to grid fluctuations and long feeders. Feature: Electrostatic shielding. Business Impact: EMI reduction and enhanced protection for nearby controls and sensors, improving protection against interference. Application: Automation cells and PLC cabinets with sensitive instrumentation. Feature: Weathershield WS36. Business Impact: Outdoor installation capability, reduced indoor footprint, and improved weather resistance. Application: Outdoor substations, yard distributions, or exposed plant spaces. Feature: Aluminum windings and robust frame 922. Business Impact: Material cost efficiency and strong mechanical support for high kva ratings in a compact footprint. Application: New builds and retrofit projects with space and weight constraints. Feature: UL Listed certification and 500 kVA, three-phase performance. Business Impact: Safety compliance, procurement confidence, and streamlined audits. Application: Industrial facilities and regulated environments requiring formal safety validation.
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FAQs
The N48M28T55 uses a 922 frame and WS36 weathershield, making outdoor or harsh indoor installations feasible. Plan for adequate service clearance and mounting support for its 4,730 lb weight. Aluminum windings and electrostatic shielding require proper grounding and EMI considerations. The unit includes voltage taps (+2.5% and -2.5%) to aid on-site voltage matching.
Key specs include a 500 kVA three-phase rating, 60 Hz frequency, primary 480 V and secondary 208Y/120 V, with a 150°C rise. The transformer uses aluminum windings, a 922 frame, and features two taps at +2.5% and four taps at -2.5% to adapt for on-site voltage variance. It is UL Listed.
Yes, the N48M28T55 is UL Listed, indicating adherence to recognized electrical safety standards for industrial transformers. This certification supports safer installation and ongoing compliance in regulated environments, particularly when integrated with protective devices sized for 500 kVA and harmonics considerations.
Warranty is Eaton’s policy 25-000: one year from installation or eighteen months from shipment, whichever occurs first. For maintenance, plan periodic checks on cooling systems, shielding integrity, and accurate tap settings during commissioning to preserve performance.
The K-Factor nonlinear design, ventilated cooling, and electrostatic shielding reduce thermal stress and EMI, while the voltage taps simplify supply balancing. In practice, users see improved reliability, easier commissioning, and lower lifecycle costs in plant floors with variable loads and stringent uptime requirements.