Eaton NT20P11S37 Transformer - UL Listed K-13 Ventilated
Part Number: NT20P11S37
Quick Summary
The Eaton NT20P11S37 transformer provides K-factor, ventilated power conditioning for industrial facilities. Operators often face heat buildup, EMI, and reliability challenges when scaling up power distribution. UL Listed safety certification ensures electrical compliance and safer installation in harsh environments. With its WS11 weather shield compatibility and 150 °C rise rating, it supports durable, long-life operation in demanding facilities. Designed for single-phase, 37.5 kVA loads with 240/480 V input and 120/240 V output, it aligns with modern industrial architectures while delivering cost-effective reliability. This combination accelerates project timelines by simplifying procurement and improving compliance across job sites.
Product Information
Extended Description
NT20P11S37 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, 37.5 kVA , Al windings, Elec. Shield, Frame: 818, uses WS11
Product Name
Eaton K-Factor nonlinear ventilated transformer
Catalog Number
NT20P11S37
UPC
786680024573
Product Length/Depth
20.36 in
Product Height
37.59 in
Product Width
22.89 in
Product Weight
320 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
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
Kva Rating
37.5 kVA
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 - NT20P11S37
Feature: K‑Factor nonlinear ventilated construction provides robust protection against harmonic distortion and overheating. Business impact: By actively dissipating heat, it lowers conductor temperatures and extends service life, which translates to fewer unscheduled outages and lower maintenance costs. Application: Ideal for mixed-load environments such as motor drives, CNC equipment, and EMC-sensitive rooms in industrial facilities. Feature: Single-phase 37.5 kVA rating with dual primary and secondary voltages (240/480 V to 120/240 V). Business impact: Simplifies wiring, reduces the need for auxiliary transformers, and enables modular expansion without redesign. Application: Common in machine controls, panel boards, and utility feeds in manufacturing plants. Feature: Aluminum windings and electrostatic shield. Business impact: Aluminum windings offer good conductivity-to-weight ratio and corrosion resistance, while the shield minimizes EMI coupling, improving sensor accuracy and protection of sensitive equipment. Application: Environments with EMI-sensitive controls or nearby communication gear. Feature: Frame 818, WS11 weather shield compatibility, and taps (1 at +5% FCAN, 2 at -5% FCBN; 4 at -2.5% FCBN; 2 at +2.5% FCAN). Business impact: Ensures mechanical fit in standard enclosures and flexible tap changes to maintain voltage during transients. Application: Retrofit projects and new builds with strict voltage tolerance. Feature: UL Listed and 150°C rise rating. Business impact: Regulatory safety compliance reduces qualification risk and supports harsh environment operation with predictable thermal performance. Application: Facilities requiring documented safety approval and high-temperature operation, such as industrial automation and material handling. Feature: WS11 weathershield compatibility and Frame 818 mounting. Business impact: Streamlines outdoor or warehouse installations and reduces mounting complexity, cutting installation time and costs. Application: Data centers, control rooms, and outdoor panels in harsh conditions.
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FAQs
NT20P11S37 requires a compatible mounting frame (818) and access to adequate ventilation for its 150°C rise rating. Ensure a source of 240/480 V primary and 120/240 V secondary wiring, and consider WS11 weather shield compatibility if outdoor or damp locations are expected. Verify UL Listed compliance and follow manufacturer installation guidelines to minimize EMI and heat buildup.
The K‑Factor nonlinear design addresses harmonic currents and non-linear loading by managing aggregated voltage and thermal stress. This reduces overheating risk and improves uptime under variable loads typical of motor drives and power-intensive equipment, delivering reliable performance in industrial environments.
NT20P11S37 is UL Listed, providing recognized safety compliance for electrical equipment. This model emphasizes safety and reliability in harsh facilities. Always confirm local regulatory requirements and ensure integration with site standards; consult Eaton documentation for certification scope and any project-specific approvals.
Primary voltage options are 240 V and 480 V, with a secondary of 120/240 V. The transformer is rated at 37.5 kVA, single-phase, with a frequency of 60 Hz. Tap settings include 1 at +5% FCAN, 2 at -5% FCBN, and 4 at -2.5% FCBN, plus 2 at +2.5% FCAN to support voltage regulation during transients.
The product is covered by Eaton’s warranty policy 25-000, one year from installation or eighteen months from shipment, whichever comes first. For maintenance, inspect insulation, windings, shield integrity, and ventilation paths regularly; ensure clean, dry surroundings and compliant electrical clearances to sustain performance and extend service life.