Eaton NT20P11S25EE Transformer - NEMA TP-1 Compliant
Part Number: NT20P11S25EE
Quick Summary
Eaton NT20P11S25EE transformer delivers K‑Factor nonlinear performance for scalable plant power distribution. Engineers grapple with harmonic distortion, winding temperature rise, and space constraints in demanding facilities. It is UL Listed and NEMA TP-1 compliant, with an electrostatically shielded, ventilated design that supports reliable operation in critical environments. As a 25 kVA single‑phase solution, it aligns with power management and distribution workflows while enabling efficient procurement and easier maintenance. Its 240/480 V primary and 120/240 V secondary arrangement, aluminum windings, and selectable taps help optimize voltage regulation across loads. With a 60 Hz rating and a 150°C rise, it supports resilient electrical rooms that meet code and performance targets in modern industrial settings.
Product Information
Extended Description
NT20P11S25EE Eaton: Eaton K-Factor nonlinear ventilated transformer, KT-13 (1-phase), PV 240 x 480V, Taps: 1 at +5%/2 at -5% x 2 at +2.5%/4 at -2.5%, SV 120/240V, 150°C rise, 25 kVA, EE
Product Name
Eaton K-Factor nonlinear ventilated transformer
Catalog Number
NT20P11S25EE
UPC
786680043543
Product Length/Depth
20.36 in
Product Height
37.59 in
Product Width
22.89 in
Product Weight
370 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.
Compliances
NEMA TP-1 Compliant
Certifications
UL Listed
Catalog Notes
NEMA TP-1 efficient
Coil material
Aluminum
Frame
818
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
Volt ampere rating
25 kVA
Phase
Single-phase
Primary voltage
240 x 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 - NT20P11S25EE
K‑Factor nonlinear ventilated transformer design reduces harmonic currents from non‑linear loads, limiting stray heating and protecting downstream equipment, which translates to higher reliability and lower maintenance costs in data centers and manufacturing lines. The 25 kVA single‑phase rating offers precise load handling for machine centers and panel boards, while 60 Hz operation ensures compatibility with standard North American power infrastructure. The aluminum windings and rugged frame 818 contribute to robust thermal performance and long service life, with the 150°C rise rating enabling effective cooling in hot industrial environments. Tap adjustments (+5% and -5% at specified positions, plus +2.5%/−2.5% options) support voltage regulation without external hardware, reducing voltage drop and improving drive performance in variable-speed applications. Electrostatic shielding minimizes EMI, helping compliance with sensitive control systems and nearby communication gear. The inclusion of WS11 weathershield compatibility and UL/NEMA TP‑1 certifications reinforces safety, reliability, and ease of procurement within power management and distribution programs. This transformer integrates smoothly with Eaton’s catalog ecosystem, allows quick mounting in standard enclosures, and supports straightforward installation in existing electrical rooms, accelerating project timelines and reducing total cost of ownership.
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FAQs
Start with confirming the primary and secondary voltages and verify the tap settings: +5%, −5% taps and +2.5%, −2.5% as specified. Mount the unit on a solid base, ensure adequate ventilation, and connect primary to 240/480 V while wiring secondary to 120/240 V circuits. Utilize frame 818 mounting and ensure compliance with UL Listed and NEMA TP-1 requirements. Keep clearances per manufacturer guidelines and maintain proper grounding for safety and performance.
The NT20P11S25EE employs a K‑Factor nonlinear design with vented construction to mitigate harmonic currents and reduce associated heating. This improves voltage regulation and extends equipment life in drives and non‑linear loads. Its 25 kVA rating supports modular power distribution, while aluminum windings aid cooling. The UL Listed and NEMA TP‑1 certifications provide assurance for compliant installations in industrial facilities and data centers.
UL Listed indicates the transformer has met safety standards developed by Underwriters Laboratories, while NEMA TP‑1 compliance denotes efficiency and design conformance for electrical distribution transformers. Together, they simplify procurement, support regulatory alignment, and reduce risk for audits and inspections in manufacturing, facilities, and utilities environments. The NT20P11S25EE also offers electrostatic shielding to minimize EMI and improve system integrity.
The unit features a footprint aligned with standard footprints: width 22.89 in, depth 20.36 in, and height 37.59 in, with a weight of 370 lb and a frame 818. Plan for ventilation and service clearances around all sides, plus mounting in a suitable enclosure or open area as needed. The WS11 weathering option supports outdoor or harsh environments. Ensure compliance with local codes and Eaton guidance during installation.
The NT20P11S25EE enables improved reliability and energy efficiency through its K‑Factor design, reduced harmonic losses, and robust cooling (150°C rise). The UL Listed and NEMA TP‑1 certifications streamline compliance, while electrostatic shielding minimizes EMI, potentially reducing downtime and shielding sensitive control equipment. With a 25 kVA rating and durable aluminum windings, the total cost of ownership decreases through longer intervals between maintenance and fewer replacements in demanding environments.