Eaton N48M28F33 Transformer - K-Factor, UL Listed
Part Number: N48M28F33
Quick Summary
Eaton N48M28F33 transformer is a K-Factor nonlinear ventilated solution for demanding industrial power distribution. It addresses overheating and non-linear loading that erode uptime, while offering reliable performance in space-limited installations. Key certifications and specs include UL Listed safety compliance, a 115°C rise rating for rugged operation, and an electrostatic shield that mitigates EMI. Taps provide +2.5% and -2.5% adjustments for precise voltage regulation, while aluminum windings and WS35 weather shield support outdoor installations. With a 300 kVA rating, three-phase configuration, 480 V primary, and 208Y/120 V secondary, this unit enables scalable, efficient energy distribution in modern plants. The design uses lightweight aluminum windings to help reduce weight for easier handling during installation and maintenance.
Product Information
Extended Description
N48M28F33 Eaton: K-Factor Non Linear Transformer, Ventilated, K-13, Three-phase, PV: 480V, Taps: 2 at +2.5% FCAN, 4 at -2.5% FCBN, SV: 208Y/120V, 115°C, 300 kVA, Al windings, Elec. Shield, Frame: 919, uses WS35
Product Name
Eaton K-Factor nonlinear ventilated transformer
Catalog Number
N48M28F33
UPC
786680036729
Product Length/Depth
36.23 in
Product Height
75 in
Product Width
44.2 in
Product Weight
3023 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
919
Tap size
2 at +2.5% FCAN, 4 at -2.5% FCBN
Frequency rating
60 Hz
Kva Rating
300 kVA
Phase
Three-phase
Primary voltage
480 V
Secondary Voltage
208Y/120 V
Temperature rise
115 °C rise
Special features
Electrostatically Shielded
Weathershield
WS35
Commercial Distribution, Transformers, Volume 2, Tab 2
Eaton's Transformer Flex Center
Eaton Specification Sheet - N48M28F33
Feature: K-Factor nonlinear ventilation is engineered to tolerate non-linear load profiles without overheating. Benefit: this reduces winding stress, minimizes insulation wear, and improves long-term reliability. Application: ideal for manufacturing floors and process plants with high harmonic currents from VFDs and advanced controls, where steady transformer performance supports consistent process uptime. Feature: Ventilated construction supports a 115°C rise and a 300 kVA three-phase rating, giving substantial overload margin. Benefit: lower cooling energy, fewer derate protections, and extended insulation life across peak operating periods. Application: suitable for distribution rooms and outdoor substations serving heavy equipment and robotics in heavy industry. In practice, plant engineers see fewer trips and more predictable transformer behavior on demanding lines. Feature: Tap adjustments provide +2.5% FCAN and -2.5% FCBN to regulate voltage on site. Benefit: enables fast, on-site voltage tuning without extra equipment, reducing commissioning time. Application: plant feeders and panelboard upgrades where supply voltage varies or needs tighter regulation. The taps also simplify migration from aging transformers during capacity upgrades. Feature: Electrostatic shielding reduces EMI coupling to nearby controls and communications lines. Benefit: safer operation of PLCs, sensors, and drives; fewer nuisance trips and data errors. Application: automation lines in packaging, material handling, and process controls located near multiple drives and variable-speed equipment. This shielding supports regulatory compliance by reducing conducted emissions. Feature: Weathershield WS35 and aluminum windings deliver outdoor durability with lighter weight. Benefit: easier handling during installation, lower maintenance costs, and reliable performance in weather-exposed substations. Application: outdoor substations, rooftops, and yards where equipment must withstand heat, dust, and moisture. Frame 919 provides sturdy mounting in constrained mechanical envelopes.
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FAQs
To install the N48M28F33 in a three-phase system, mount the unit using frame 919 on a suitable base with clear ventilation and enough clearance per local code. Connect the 480 V primary to the incoming three-phase supply and the 208Y/120 V secondary to the distribution circuits. Use the voltage taps at +2.5% FCAN and -2.5% FCBN for fine regulation and ensure UL-listed wiring practices.
K-Factor is a design rating indicating the transformer's ability to tolerate non-linear loads, such as harmonic-rich currents, without overheating. The N48M28F33 uses a nonlinear ventilated design to manage these harmonics, reducing winding stress and improving efficiency under VFDs and switching loads. Practically, this yields higher uptime, steadier voltages, and lower cooling energy in demanding facilities.
Yes. Outdoor suitability is supported when paired with the WS35 weather shield, which provides weather protection. The electrostatic shield reduces EMI near control systems, and aluminum windings offer corrosion resistance. For outdoor installations, ensure proper enclosure, ventilation, and adherence to local codes to maintain performance and safety.
The N48M28F33 is UL Listed, confirming recognized safety compliance. It operates at 60 Hz with a 300 kVA rating, has a 480 V primary and 208Y/120 V secondary, and features a 115°C rise. The unit uses aluminum windings, frame 919, and WS35 weather shield, aligning with common industrial standards for rugged environments.
The N48M28F33 delivers lower lifecycle costs through durable aluminum windings, robust ventilation, and EMI shielding that protects sensitive automation. Routine maintenance is minimized by rugged construction and UL-listed safety. Its reliable performance under harmonic loads reduces downtime and energy use, supporting faster project ROI for large industrial installations.