Eaton T20P11S37ZZ Open-core Transformer - UL Recognized
Part Number: T20P11S37ZZ
Quick Summary
Eaton Open-core Transformer provides reliable, efficient power distribution for dry-type applications in industrial control panels and electrical rooms. When panel spaces are tight and heat management becomes a bottleneck, engineers need a compact, ventilated solution that maintains performance under load. This unit carries UL Recognized certification and features a DS-3 design with a 150°C rise, supporting safe operation across demanding environments. With aluminum windings and a 37.5 kVA rating, it delivers scalable power while minimizing weight and energy losses. These attributes, combined with flexible primary/secondary voltages and adjustable taps, translate into lower lifecycle costs and simpler procurement for industrial facilities.
Product Information
Extended Description
T20P11S37ZZ Eaton: General-Purpose Transformer, Ventilated, Dry Type Distribution, DS-3, 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, Frame: 817C
Product Name
Eaton Open core-coil ventilated transformer
Catalog Number
T20P11S37ZZ
UPC
786680023224
Product Length/Depth
0.001 in
Product Height
0.001 in
Product Width
0.001 in
Product Weight
235 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 Recognized
Catalog Notes
Open type core and coil assembly
Coil material
Aluminum
Design
DS-3
Frame
817C
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
Kva Rating
37.5 kVA
Phase
Single-phase
Primary voltage
240 V, 480 V
Secondary Voltage
120/240 V
Temperature rise
150 °C rise
Feature: Open-core ventilated design for efficient cooling → Benefit: Supports higher loading with stable temperatures, improving uptime and reducing cooling energy costs → Application: Dry-type transformer installations in compact control panels and distribution rooms. Feature: Aluminum windings → Benefit: Lighter weight and improved thermal response, reducing handling costs and enabling easier on-site replacements → Application: Retrofit projects and new builds where installation efficiency matters. Feature: 37.5 kVA single-phase rating at 60 Hz with 240/480 V primary and 120/240 V secondary → Benefit: Broad compatibility with plant power architectures and scalable distribution for motor drives and control circuits → Application: Industrial facilities requiring reliable, pre-wired power distribution stages. Feature: Tap changers (+5% FCAN, -5% FCBN x 2, +2.5% FCAN, -2.5% FCBN) → Benefit: Voltage tailoring to compensate for load and supply variations, reducing harmonics and improving regulation → Application: Facilities with variable loads or long feeder runs. Feature: DS-3 design with 150°C rise and open-type core/coil assembly → Benefit: High-temperature tolerance and serviceability, enabling easier maintenance and longer service life → Application: Harsh manufacturing environments and mission-critical panels. Feature: UL Recognized certification and open-type construction → Benefit: Clear compliance and safer installation practices, with documented safety for field wiring and service → Application: Electrical rooms and panel assemblies requiring recognized safety standards.
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FAQs
For proper installation, ensure adequate ventilation around the open-core unit to maximize cooling, plan for a stable mounting surface capable of supporting the 235 lb weight, and provide appropriate clearance for taps and wiring access. Verify compatibility with 240/480 V primary supply and 120/240 V secondary loads, and confirm UL Recognized compliance on site.
Key compatibility factors include 37.5 kVA rating, single-phase operation, primary voltage options of 240 V or 480 V, secondary 120/240 V, and the presence of taps for voltage adjustment (+5%, -5% and ±2.5%). Ensure your panel can accommodate a 60 Hz distribution transformer with open-core ventilation and aluminum windings for weight and thermal performance.
Yes. The transformer is designed for a 150 °C rise, which supports operation in warmer environments when properly ventilated. The DS-3 design and ventilated core contribute to effective heat dissipation, helping maintain voltage regulation and efficiency under load in industrial settings.
The Eaton T20P11S37ZZ is UL Recognized, confirming safety compliance for electrical equipment. This helps with regulatory acceptance in many facilities and simplifies procurement when safety certification is a buying criterion. The catalog notes emphasize an open-type core and coil assembly for serviceability.
Schedule routine visual inspections of the windings and core for signs of overheating or contamination, verify tap settings remain within tolerance, and monitor for any unusual vibration or noise. The unit includes aluminum windings and an open-core assembly, which facilitate on-site inspection and potential component replacement, contributing to lower lifecycle costs and easier servicing.