Eaton S20N11B25CU Transformer - 25 kVA UL Listed
Part Number: S20N11B25CU
Quick Summary
Eaton S20N11B25CU general-purpose encapsulated transformer delivers reliable voltage transformation for industrial control panels. When space is at a premium or harsh conditions threaten uptime, its compact, rugged design helps you avoid costly downtime. Certified UL Listed with a NEMA 3R enclosure and indoor-outdoor capability, it meets essential safety and deployment standards. The 60 Hz single-phase unit accepts 240/480 V input and provides 120/240 V outputs, enabling flexible machine integration and energy efficiency. With 25 kVA capacity, copper windings, and a 80 °C rise, it delivers dependable performance for control panels, switchgear, and distribution applications. This combination of rugged enclosure, versatile taps, and robust warranty supports maintenance efficiency and simplified procurement.
Product Information
Extended Description
S20N11B25CU Eaton: Eaton General purpose encapsulated transformer, EP, copper, NEMA 3R, 182, 60 Hz, single-phase, 240 V, 480 V, 120/240 V, 2 at -5% FCBN X 4 at -2.5% FCBN, 80 °C rise, 25 KVA, indoor-outdoor, 3A
Product Name
Eaton General purpose encapsulated transformer
Catalog Number
S20N11B25CU
UPC
786680048081
Product Length/Depth
14.12 in
Product Height
23.31 in
Product Width
16.35 in
Product Weight
430 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 Listed
Coil material
Copper
Design
EP
Enclosure
NEMA 3R
Frame
182
Tap size
2 at -5% FCBN x 4 at -2.5% FCBN
Type
General-Purpose Encapsulated Transformer
Wiring connection
3A
Frequency rating
60 Hz
Phase
Single-phase
Primary voltage
240 V, 480 V
Secondary Voltage
120/240 V
Temperature rise
80 °C rise
Volt ampere rating
25 kVA
Weathershield
Indoor-Outdoor
Feature: Encapsulated copper-winded construction. Business Impact: Delivers robust electrical performance with improved thermal management and longer life in harsh environments. Application: Ideal for control panels and machine enclosures in manufacturing facilities where reliability is critical. Feature: NEMA 3R indoor-outdoor enclosure with Weathershield. Business Impact: Provides weather resistance and vandal-durability, reducing service calls and downtime. Application: Outdoor substations, outdoor control panels, and exposed installation sites. Feature: Flexible primary and secondary voltages (240/480 V to 120/240 V). Business Impact: Simplifies design, reduces inventory, and accelerates installation across mixed-power facilities. Application: Equipment rooms and distributed control systems needing versatile power conversion. Feature: 25 kVA single-phase rating with copper windings. Business Impact: Supports moderate loads with high efficiency, minimizing the need for multiple units and lowering lifecycle cost. Application: Switchgear panels, motor control centers, and distribution boards. Feature: Tap changer 2 at -5% and 4 at -2.5% FCBN. Business Impact: Enables precise voltage regulation under variable load conditions, improving downstream device performance. Application: Critical control circuits and sensors requiring stable voltage. Feature: 80 °C rise rating. Business Impact: Ensures safe operation under elevated ambient temperatures, reducing thermal stress. Application: Plant floors and equipment rooms with limited cooling. Feature: UL Listed certification and 1-year warranty (or 18 months from shipment). Business Impact: Aligns with procurement standards and lowers risk through reputable warranty coverage. Application: Compliance-driven projects and long-term maintenance planning.
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FAQs
Plan for a weather-protected mounting location using a NEMA 3R enclosure rated unit. Allow clearances for service access, proper ventilation, and cable entry. Use copper winding connections (3A standard) and follow UL guidance for outdoor installations. Ensure the unit is securely mounted and protected from physical impact to maintain rating integrity.
The transformer supports 60 Hz operation with a primary of 240 V and 480 V and a secondary of 120/240 V. It includes tap settings of 2 at -5% and 4 at -2.5% FCBN to regulate output under load, helping maintain stable downstream voltages in fluctuating supply conditions.
Yes, the unit is UL Listed and designed with a NEMA 3R enclosure suitable for indoor-outdoor service. This combination provides recognized safety compliance and robust protection against weather elements in mixed installation environments.
Rated for 25 kVA, single-phase, at 60 Hz, with 240/480 V primary and 120/240 V secondary. It is well-suited for control panels, motor control centers, and distribution boards where reliable step-down power is required in industrial settings.
Eaton provides a warranty per policy 25-000: one year from installation or eighteen months from shipment, whichever occurs first. This is complemented by Eaton's technical support and product documentation to ensure ongoing uptime and serviceability.