Eaton HT20P11S50EEZZ Open core-coil transformer - UL Listed
Part Number: HT20P11S50EEZZ
Quick Summary
Eaton Open core-coil ventilated transformer provides reliable isolation and stable power for control panels and plant electrical rooms. A common pain point is heat buildup and space constraints that reduce efficiency and complicate installations. UL Listed and NEMA TP-1 compliant, this open-type core and coil assembly offers proven safety and performance. The 50 kVA rating supports medium-load applications while maintaining compact street-cred in industrial environments. By combining robust construction with efficient cooling, it delivers predictable electrical performance, easier procurement of compatible components, and lower lifecycle costs for panel builders and industrial operators alike.
Product Information
Extended Description
HT20P11S50EEZZ Eaton: Eaton Open core-coil ventilated transformer, KT-4 (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, 50 kVA, EE, ZZ
Product Name
Eaton Open core-coil ventilated transformer
Catalog Number
HT20P11S50EEZZ
UPC
786680076763
Product Length/Depth
23.84 in
Product Height
42.03 in
Product Width
24.22 in
Product Weight
529 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, Open type core and coil assembly
Coil material
Aluminum
Frame
819
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 x 480 V
Secondary Voltage
120/240 V
Temperature rise
150 °C rise
Volt ampere rating
50 kVA
Special features
Electrostatically shielded
Weathershield
WS16
Commercial Distribution, Transformers, Volume 2, Tab 2
Eaton Specification Sheet - HT20P11S50EEZZ
Selling Policy 25-000 - Distribution and Control Products and Services
Feature → Open core-coil ventilated design with aluminum coil and frame 819 improves heat dissipation and reduces thermal derating. Business Impact → Lower operating temperatures boost efficiency, extend transformer life, and reduce maintenance in demanding environments. Application → Ideal for control panels and distribution enclosures in manufacturing lines where space and airflow are critical.Feature → Tap technology with 1 at +5%, 2 at -5%, and 2 at +2.5%/4 at -2.5% provides precise voltage accommodation. Business Impact → More stable loads, fewer nuisance trips, and better compatibility with variable plant power. Application → Suitable for systems requiring tight voltage regulation across 240/480 V primary and 120/240 V secondary.Feature → 60 Hz single-phase operation at 50 kVA with primary 240 x 480 V and secondary 120/240 V. Business Impact → Consistent performance under standard industrial power quality, enabling reliable motor and controls operation. Application → Directly supports machine builders and control panel designers.Feature → Electrostatically shielded construction with WS16 weather shield option and aluminum coil. Business Impact → Enhanced EMI protection and environmental resilience in indoor/outdoor installations, reducing shielding costs. Application → Critical for sensitive control circuits and outdoor electrical rooms.Feature → Compliance and warranty framework with NEMA TP-1 efficiency, UL Listed status, and one-year warranty. Business Impact → Lower risk, faster regulatory acceptance, and predictable support terms. Application → Ideal for compliant procurement and long-term service planning.Feature → Mechanical footprint and weight specifications (23.84 in L, 42.03 in H, 24.22 in W, 529 lb). Business Impact → Clear installation planning, room mapping, and mounting compatibility with standard enclosures. Application → Retrofit or new-build projects in space-constrained industrial facilities.
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FAQs
For installation, verify panel footprint matches the 23.84 in length, 24.22 in width, and 42.03 in height. Mount in a ventilated area to leverage the open core design, connect 240/480 V primary to 120/240 V secondary, and use the voltage taps for regulation as needed. Ensure UL Listed wiring practices and NEMA TP-1 compliance are followed, and reference the WS16 weather shield if outdoor exposure is anticipated.
Key specs include a 50 kVA rating, 60 Hz frequency, single-phase arrangement, primary voltage 240 x 480 V, secondary voltage 120/240 V, and an operating temperature rise of 150 °C. Tap changer options are 1 at +5%, 2 at -5%, and 2 at +2.5%/4 at -2.5%. The coil is aluminum, with an open core and shielded construction.
Yes, with the WS16 Weather Shield option and proper enclosure strategies, the transformer can be installed in more exposed environments. Its open core design benefits from ventilation, while the shield and shielding features provide EMI protection. Always confirm enclosure ingress protection and local environmental requirements before outdoor mounting.
HT20P11S50EEZZ carries UL Listed certification and NEMA TP-1 efficiency compliance, confirming safety and energy performance. The product notes emphasize an open type core and coil assembly designed for efficient operation. These certifications support regulatory acceptance, safer installation, and long-term reliability in industrial power distribution projects.
Eaton provides a one-year warranty from installation or eighteen months from shipment, whichever occurs first. This aligns with standard distribution and control product policies and supports planned maintenance, spare part planning, and service contracts. For ongoing reliability, reference the Eaton specification sheets and warranty documents linked in the product downloads.