Eaton T20P29S25CUNV Transformer - DS-3 Dry Type
Part Number: T20P29S25CUNV
Quick Summary
Eaton T20P29S25CUNV is a dry-type distribution transformer used to reliably step down 240/480V primary to 208V secondary in industrial facilities. In practice, engineers face tight spaces, dust, and heat that can compromise power reliability; this unit’s totally enclosed non-ventilated design helps protect windings and insulation while simplifying installation. Certifications and policy context matter, so confirm CE/UL or other regional ratings with the manufacturer and reference Eaton’s warranty details. From a business perspective, the 25 kVA rating, copper windings, and adjustable taps translate to precise voltage control and reduced energy waste, while DS-3 compatibility supports scalable, compliant power distribution in rugged environments.
Product Information
Extended Description
T20P29S25CUNV 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: 208V, 150°C, 25 kVA, Cu windings, Frame: 818N
Product Name
Eaton Totally enclosed non-ventilated transformer
Catalog Number
T20P29S25CUNV
UPC
786680052125
Product Length/Depth
20.36 in
Product Height
37.59 in
Product Width
22.89 in
Product Weight
1 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
Contact Manufacturer
Catalog Notes
Totally enclosed non-ventilated DS-3 or DT-3
Coil material
Copper
Design
DS-3
Frame
818N
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
208 V
Temperature rise
150 °C rise
Commercial Distribution, Transformers, Volume 2, Tab 2
Eaton Specification Sheet - T20P29S25CUNV
Selling Policy 25-000 - Distribution and Control Products and Services
Feature → Business Impact → Application: Copper windings deliver superior electrical conductivity and efficiency, reducing I²R losses and heat generation in demanding distribution panels, which translates to lower operating temperatures and longer service life in industrial applications. Application: Ideal for control rooms and machine centers requiring reliable 208V secondary from 240/480V mains. Feature → Business Impact → Application: 25 kVA single-phase rating provides ample headroom for localized loads, enabling simple panel zoning and minimizing the need for parallel transformers in mid-size facilities. Application: Suitable for small to mid-size industrial installations with expansion potential. Feature → Business Impact → Application: Tap settings including 1 at +5% FCAN, 2 at -5% FCBN, 2 at +2.5% FCAN, 4 at -2.5% FCBN allow site-specific voltage adjustment, reducing burden on downstream regulation and improving equipment performance. Application: Fine-tune supply to motors and controls in variable-load environments. Feature → Business Impact → Application: Totally enclosed non-ventilated DS-3 design reduces dust ingress and moisture exposure while limiting noise, delivering dependable operation in compact electrical rooms. Application: Suitable for tight industrial spaces and panels with restricted ventilation. Feature → Business Impact → Application: 150°C rise insulation rating supports continuous operation in warm environments and simplifies clearance planning, improving reliability in harsh factory floors. Application: High-temperature zones and dense rack installations. Feature → Business Impact → Application: Copper windings paired with a robust 818N frame ensure mechanical stability during mounting and service, enabling straightforward installation on standard supports. Application: OEM integration and retrofit projects where mounting consistency matters. Feature → Business Impact → Application: Clear Eaton warranty policy and comprehensive catalog documentation provide project assurance and easier procurement, reducing risk during long-term maintenance planning. Application: Corporate procurement and end-user maintenance planning in industrial settings.
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FAQs
For compact rooms, ensure vertical and horizontal clearance per Eaton guidelines, accommodate the 20.36 in L x 22.89 in W x 37.59 in H footprint, and provide non-oiled, vibration-stable mounting on a solid base. The DS-3 enclosure is designed for restricted ventilation, so plan for minimal dust exposure and stable mounting to maintain performance over time.
The transformer has a 240 V or 480 V primary and a 208 V secondary. Tap settings include 1 at +5% FCAN, 2 at -5% FCBN, 2 at +2.5% FCAN, and 4 at -2.5% FCBN, allowing field adjustment to match site supply within tolerance and reduce voltage-related losses.
Yes. Catalog notes specify DS-3 as a compatible configuration, and the totally enclosed non-ventilated design supports clean, dust-reduced operation in confined panel environments. Its 25 kVA rating suits many mid-size industrial control panels, providing dependable distribution without oil-filled equipment.
Warranty follows Eaton Selling Policy 25-000, offering one year from installation or eighteen months from shipment, whichever occurs first. Certifications are listed as 'Contact Manufacturer' for this model, so confirm CE/UL/CSA or regional equivalents directly with Eaton for your project.
As a dry-type transformer with copper windings and a robust DS-3 enclosure, it requires minimal maintenance and avoids oil-related concerns. The 150°C rise insulation and 60 Hz single-phase design reduce fault propensity, enabling longer intervals between inspections and lower total cost of ownership in rugged industrial environments.