Eaton NT20P11S25 Transformer - UL Listed K-Factor
Part Number: NT20P11S25
Quick Summary
Eaton NT20P11S25 Transformer is a K-Factor nonlinear ventilated transformer for critical power distribution applications across data centers, manufacturing lines, and process controls. Engineers frequently wrestle with voltage regulation, harmonics, and heat buildup under varying loads, which can shorten equipment life and increase downtime. UL Listed safety certification provides confidence in electrical compliance, while a 150 °C temperature rise and 60 Hz single‑phase design match standard industrial power systems. Coupled with aluminum windings, an electrostatic shield, and WS11 weather protection, this transformer offers improved reliability, reduced maintenance, and a smoother integration into existing power management architectures. Its adaptable taps and rugged frame support flexible installation, making it a prudent choice for new builds and retrofits alike.
Product Information
Extended Description
NT20P11S25 Eaton: K-Factor Transformer, Ventilated, K-13, Single-phase, PV: 240 X 480V, Taps: 1 at +5% FCAN, 2 at -5% FCBN X 2 at +2.5% FCAN, 4 at -2.5% FCBN, SV: 120/240V, 150°C, 25 kVA , Al windings, Elec. Shield, Frame: 817, uses WS11
Product Name
Eaton K-Factor nonlinear ventilated transformer
Catalog Number
NT20P11S25
UPC
786680024566
Product Length/Depth
19.5 in
Product Height
37.53 in
Product Width
22.59 in
Product Weight
278 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
817
Tap size
1 at +5% FCAN, 2 at -5% FCBN x 2 at +2.5% FCAN, 4 at -2.5% FCBN
Frequency rating
60 Hz
Phase
Single-phase
Primary voltage
240 V, 480 V
Secondary Voltage
120/240 V
Temperature rise
150 °C rise
Special features
Electrostatically shielded
Weathershield
WS11
Commercial Distribution, Transformers, Volume 2, Tab 2
Eaton's Transformer Flex Center
Eaton Specification Sheet - NT20P11S25
Selling Policy 25-000 - Distribution and Control Products and Services
Feature: K-Factor nonlinear design enhances harmonic handling and fault tolerance → Business Impact: reduces nuisance tripping and power quality issues, lowering maintenance costs → Application: ideal for nonlinear loads in data centers and factory floors. Feature: Ventilated construction with a 150 °C rise rating → Business Impact: superior thermal management enables stable operation under peak loading → Application: reliable performance in high-ambient environments and continuous duty setups. Feature: 25 kVA single-phase rating with 240/480 V primary and 120/240 V secondary → Business Impact: compact, scalable power conditioning for control panels and distribution feeders → Application: mid-range industrial power conditioning for multiple downstream circuits. Feature: Aluminum windings and electrostatic shield → Business Impact: improved efficiency, reduced copper losses, and EMI containment → Application: sensitive electronics and mixed-load systems requiring clean power. Feature: Frame 817 with WS11 weather shield and multiple taps (1 at +5% FCAN, 2 at -5% FCBN, 2 at +2.5% FCAN, 4 at -2.5% FCBN) → Business Impact: flexible voltage regulation and durable outdoor/harsh-environment installation → Application: outdoor equipment rooms, process areas, and harsh industrial settings.
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FAQs
NT20P11S25 is designed for 240/480 V primary supplies at 60 Hz and is suitable for single-phase distribution. It features taps for voltage regulation (+5%, -5%, +2.5%, -2.5%) to accommodate voltage fluctuations. When integrating into a panel or switchgear, verify clearances around the 19.5 in length, 22.59 in width, and 37.53 in height footprint to ensure compliant installation and airflow.
The NT20P11S25 is UL Listed, which confirms safety compliance for electrical equipment used in industrial environments. This certification helps reassure procurement and compliance teams during audits and approvals. Note that the provided data does not list SIL, CE, or IP ratings for this specific model, so confirm regional requirements if applicable in your installation site.
K-Factor nonlinear transformers are engineered to handle harmonic-rich loads more effectively, reducing voltage distortion and overheating risks. This leads to better power quality for downstream equipment and extended component life. For facilities with variable speed drives or high-crest-factor loads, a K-Factor design like NT20P11S25 can minimize nuisance trips and improve overall system reliability.
WS11 weather shield and frame 817 are intended for rugged environments and outdoor or harsh indoor installations where atmospheric exposure or mechanical stress is a concern. The combination supports durable mounting, enhanced protection against contaminants, and stable performance in varying temperatures. Verify fitment in your enclosure or outdoor pad applications to maintain ventilation and cooling efficiency.
Eaton provides a warranty under policy 25-000 covering one year from installation or eighteen months from shipment, whichever occurs first. For service and support, reference the Eaton Selling Policy 25-000 and contact authorized distributors. This warranty complements UL safety certification, ensuring long-term confidence in maintenance, spare parts availability, and performance guarantees in industrial installations.