Eaton T20P11S25ZZ Transformer - UL Recognized
Part Number: T20P11S25ZZ
Quick Summary
The T20P11S25ZZ open core-coil ventilated transformer delivers 25 kVA of reliable, single-phase power distribution for industrial controls and equipment rooms. Operators and engineers often struggle with heat buildup, efficiency losses, and voltage stability in poorly cooled transformers. Key certifications like UL Recognized support safety compliance, while the DS-3 design and aluminum windings enable robust, dry-type distribution in demanding environments. With a compact frame and versatile tap options, this transformer integrates smoothly into new or retrofit installations, helping minimize downtime and energy waste.
Product Information
Extended Description
T20P11S25ZZ 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, 25 kVA, Al windings, Frame: 816C
Product Name
Eaton Open core-coil ventilated transformer
Catalog Number
T20P11S25ZZ
UPC
786680023217
Product Length/Depth
0.001 in
Product Height
0.001 in
Product Width
0.001 in
Product Weight
205 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
816C
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 V, 480 V
Secondary Voltage
120/240 V
Temperature rise
150 °C rise
Open-core ventilated design enables natural convection cooling, reducing hotspot risk and supporting stable operation in open panels. This improves reliability while minimizing fan usage and thermostat cycling, delivering lower maintenance costs and longer service intervals for continuous production. The design pairs well with standard industrial control cabinets, enabling straightforward mounting and compatibility with common enclosure widths and din-rail accessories. Multi-tap primary with +5% FCAN, -5% FCBN, and +2.5% FCAN, -2.5% FCBN across four taps lets you match supply voltages on 240/480 V systems, reducing voltage drop and protecting connected equipment. This flexibility simplifies installation and reduces the risk of undervoltage or overvoltage conditions during commissioning and site voltage fluctuations. It supports quick field adjustments and seamless integration with existing plant power architectures. Aluminum windings reduce weight and material cost while maintaining full current capacity within the 25 kVA rating. This enables easier handling during installation and minimizes structural loading in the 816C frame, aiding retrofits in space-constrained cabinets. The combination of lighter windings and a compact footprint supports faster installation and lower logistics costs on large projects. Dry-type, ventilated construction eliminates oil handling, improving safety and reducing environmental concerns in plant environments. The 150 °C rise rating provides a robust margin for short-term overloads and high ambient temperatures, helping maintain stable voltage regulation in harsh factory settings. The open-core, DS-3 design is compatible with standard electrical codes and Eaton accessories for straightforward integration. UL Recognized certification confirms compliance with safety standards, while Eaton's comprehensive warranty adds lifecycle protection for critical infrastructure. This 25 kVA transformer is well suited for new installations and retrofit programs in manufacturing, facilities, and distribution panels where reliable single-phase power is essential.
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FAQs
Plan for adequate ventilation around the open-core assembly, provide clearance for cooling air, and mount the unit in a stable, vibration-free frame. The 816C enclosure size fits standard retrofit panels, while the 25 kVA rating requires a firm mounting footprint and accessible primary taps for safe voltage adjustments.
The T20P11S25ZZ supports 240/480 V primary voltages with a 120/240 V secondary. It offers taps at +5% FCAN, -5% FCBN, and +2.5% FCAN, -2.5% FCBN variants across four taps to accommodate supply variance, improving voltage regulation and reducing downstream equipment stress.
Yes. The DS-3 design uses an open-core, ventilated construction with aluminum windings, delivering reliable performance in dry indoor environments. Its 150°C rise rating and UL Recognized certification further ensure safety, consistent operation, and compatibility with standard plant cabinets and enclosures.
The transformer carries UL Recognized certification, indicating compliance with recognized electrical safety standards. Eaton provides a one-year warranty from installation or 18 months from shipment, whichever comes first, ensuring post-sale support and coverage for manufacturing defects.
With a dry-type design, aluminum windings, and oil-free operation, maintenance is minimal compared with oil-filled units. The 25 kVA rating matches many distribution circuits, reducing energy waste through proper voltage matching and improving system reliability, which lowers downtime-related costs in manufacturing and facilities operations.