Eaton T20P11S25EEZZ Open Core Transformer - UL Recognized
Part Number: T20P11S25EEZZ
Quick Summary
Eaton Open core-coil ventilated transformer provides reliable power isolation for control panels and distribution systems. Many installers wrestle with voltage mismatches and tap settings that drift under load, risking equipment damage or nuisance tripping. UL Recognized and NEMA TP-1 compliant, this transformer balances rugged performance with safer operation in industrial environments, while delivering efficient heat dissipation. The design supports 240/480 V primary and 120/240 V secondary, with tap options to compensate for voltage fluctuations. With a 25 kVA rating and a robust 150°C rise, it delivers dependable, scalable power for automation, motors, and PLC interfaces, reducing maintenance and improving overall system uptime.
Product Information
Extended Description
T20P11S25EEZZ Eaton: Eaton Open core-coil ventilated transformer, DS-3 (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, ZZ
Product Name
Eaton Open core-coil ventilated transformer
Catalog Number
T20P11S25EEZZ
UPC
786680088377
Product Length/Depth
0.001 in
Product Height
0.001 in
Product Width
0.001 in
Product Weight
356 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 Recognized
Catalog Notes
NEMA TP-1 efficient, Open type core and coil assembly
Coil material
Aluminum
Frame
CS25E103
Tap size
1 at +5% FCAN, 2 at -5% FCBN x 2 at +2.5% FCAN, 4 at -2.5% FCBN
Type
Dry Type Distribution Transformer
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
25 kVA
Feature: Open core-coil ventilated design improves cooling and reduces thermal stress. Business Impact: Enhanced reliability and longer service life in continuous-duty applications. Application: Suitable for dry-type distribution in switchgear and control panels where heat buildup is a concern. Feature: Multiple voltage taps (+5%, -5% and +/-2.5% options). Business Impact: Precise voltage regulation under fluctuating line conditions, reducing device nuisance tripping and extending equipment life. Application: Quick field adjustments to accommodate supply variance in factories or outdoor installations. Feature: 240/480 V primary with 120/240 V secondary. Business Impact: Flexible deployment across common industrial voltages, enabling a single device to serve varied loads. Application: Industrial automation, panel boards, and lighting or control circuits. Feature: Aluminum coil, CS25E103 frame, 25 kVA rating. Business Impact: Lightweight yet robust construction supports easier installation and consistent performance at scale. Application: Medium-power distribution tasks in automation environments. Feature: 60 Hz, single-phase, 150°C rise, UL Recognized and NEMA TP-1 compliant. Business Impact: Compliance and thermal performance reduce risk, simplify procurement, and streamline audits. Application: Kit-ready for industrial facilities requiring standards conformance and predictable thermal margins. Insight: Open-core ventilated distribution transformers are known for improved heat dissipation in retrofit projects and new builds alike, helping facilities maintain uptime and avoid costly cooling upgrades.
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FAQs
This is a single-phase 25 kVA transformer with a 240/480 V primary and 120/240 V secondary designed for dry-type, ventilated installations. Plan for adequate clearance and ventilation around the open-core assembly, secure mounting on a compatible frame (CS25E103), and correct terminal connections to minimize voltage drop. Weight is substantial (356 lb), so use proper lifting and mounting hardware.
The unit provides taps at 1 at +5%, 2 at -5%, and 4 at -2.5% with 2 at +2.5% options. These allow compensation for supply variations, improving voltage regulation at the load and reducing cycling or tripping in sensitive equipment. Properly selecting taps during commissioning yields tighter regulation across typical industrial loads.
Yes. It is a dry-type, ventilated transformer with UL Recognized certification and NEMA TP-1 compliance, designed for reliable operation in industrial settings. The 150°C rise rating supports hotter ambient conditions, while the aluminum coil and sturdy CS25E103 frame contribute to durability and long service life in demanding environments.
The unit is UL Recognized and NEMA TP-1 compliant. UL Recognized ensures compatibility with safety and performance standards for electrical components, while NEMA TP-1 confirms efficiency and performance for electrical distribution equipment. Together, they simplify procurement, installation approvals, and regulatory audits in industrial facilities.
Warranty follows Eaton’s policy: 1 year from installation or 18 months from shipment, whichever occurs first. The transformer’s efficient open-core design, reliable insulation, and voltage-tap flexibility reduce maintenance costs, improve uptime, and lower total cost of ownership in automation and control applications.