Eaton N44M31T09 K-Factor Ventilated Transformer - UL Listed
Part Number: N44M31T09
Quick Summary
N44M31T09 is a K-Factor nonlinear ventilated transformer designed for reliable three-phase power distribution in industrial facilities. Engineers often battle overheating, voltage drift, and space constraints in rugged environments, and this unit addresses heat with a 150°C rise, aluminum windings, and an electrostatic shield. It carries UL Listed safety certification and a rugged 912B frame, simplifying installation in new or retrofit projects. By combining precise taps with a WS38 weather shield and robust cooling, the solution delivers improved efficiency, safer operation, and lower maintenance costs across manufacturing lines.
Product Information
Extended Description
N44M31T09 Eaton: K-Factor Non Linear Transformer, Ventilated, K-13, Three-phase, PV: 440V, Taps: 2 at +2.5% FCAN, 4 at -2.5% FCBN, SV: 220Y/127V, 150°C, 9 kVA, Al windings , Elec. Shield, Frame: 912B, uses WS38
Product Name
Eaton K-Factor nonlinear ventilated transformer
Catalog Number
N44M31T09
UPC
786680056178
Product Length/Depth
16.5 in
Product Height
30 in
Product Width
23 in
Product Weight
196 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
912B
Tap size
2 at +2.5% FCAN, 4 at -2.5% FCBN
Frequency rating
60 Hz
Kva Rating
9 kVA
Phase
Three-phase
Primary voltage
440 V
Secondary Voltage
220Y/127 V
Temperature rise
150 °C rise
Special features
Electrostatically Shielded
Weathershield
WS38
Commercial Distribution, Transformers, Volume 2, Tab 2
Eaton's Transformer Flex Center
Eaton Specification Sheet - N44M31T09
Feature: K-Factor nonlinear design with designated taps (+2.5% FCAN, -2.5% FCBN). Business Impact: Enhanced voltage regulation under non-linear loads and better transient handling, reducing equipment stress and extending component life. Application: motor drives, CNC machines, and automated lines where load shapes fluctuate. Feature: Ventilated construction with aluminum windings. Business Impact: Superior cooling, lower copper dependency, and long-term reliability in hot environments. Application: outdoor switchgear, service entrances, and harsh manufacturing floors. Feature: Three-phase 9 kVA rating with 440 V primary and 220Y/127 V secondary. Business Impact: Efficient step-down power for distribution panels with tight voltage control and compact footprint. Application: process control cabinets and panel boards in mid-size facilities. Feature: Frame 912B with dimensions 16.5 in L × 30 in H × 23 in W and weight 196 lb. Business Impact: Clear installation planning, compatible mounting in standard enclosures, and predictable handling during installation. Application: retrofit projects and new builds where space is constrained. Feature: Electrostatic shield and WS38 weathershield. Business Impact: EMI protection and environmental resilience, enabling safer operation in dusty or outdoor environments. Application: outdoor sub-panels and exposed process instrumentation. Feature: 150°C temperature rise and 60 Hz operation. Business Impact: High-thermal tolerance for demanding industrial loads and compatibility with common utility systems. Application: factory floors with varying ambient temperatures and frequent startup transients. Feature: UL Listed certification and one-year warranty. Business Impact: Proven safety compliance and reduced risk for procurement and commissioning teams. Application: regulated industries and retrofit projects requiring documented standards.
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FAQs
The N44M31T09 with WS38 is designed for versatile installation in industrial environments, including outdoor applications where weather protection is beneficial. Ensure adequate ventilation around the unit, provide access for taps and shield components, and maintain clearance to prevent overheating. Proper mounting on a stable platform with room for service access minimizes installation risk and supports compliant wiring practices.
Key specs include a 9 kVA rating, three-phase configuration, 440 V primary, 220Y/127 V secondary, and a 60 Hz frequency rating. It uses aluminum windings, features a 912B frame, and provides taps at +2.5% FCAN and 4 at -2.5% FCBN. The transformer supports a 150°C rise and includes an electrostatic shield for EMI protection.
Yes. The K-Factor nonlinear design and ventilated construction improve transient tolerance and heat management, which are essential for motor drives and servo systems subject to peak loads. With a 9 kVA rating and precise taps, this transformer maintains stable voltages under non-linear loading, reducing nuisance tripping and downtime in automation applications.
The transformer is UL Listed, confirming compliance with recognized electrical safety standards. This certification aids procurement teams by validating safety qualifications and simplifies regulatory approvals for installation in many industrial facilities.
Expect routine inspections for insulation integrity, cooling system performance, and tap correctness. The unit’s aluminum windings and shielded design reduce maintenance needs, while the WS38 weather shield enhances durability in harsh environments. The one-year Eaton warranty provides built-in support during early operation and commissioning.