Eaton S20N11S25SS General-Purpose Transformer - UL Listed
Part Number: S20N11S25SS
Quick Summary
Eaton S20N11S25SS general‑purpose encapsulated transformer powers critical loads in industrial facilities. Many buyers struggle with limited space and outdoor exposure in power distribution, and this unit addresses both with a compact, rugged design. UL Listed safety certification underpins compliance, while the NEMA 3R enclosure and indoor-outdoor capability ensure reliable operation in varying environments. With a 25 kVA rating and 240/480 V input to 120/240 V output, it supports efficient, scalable power management and panel integration for industrial automation.
Product Information
Extended Description
S20N11S25SS Eaton: Eaton, general purpose encapsulated transformer, ep, single-phase, pv: 240 x 480v, taps: none, sv: 120/240v, 115°c, 25 kva, al windings, frame: 182, indoor-outdoor
Product Name
Eaton General purpose encapsulated transformer
Catalog Number
S20N11S25SS
UPC
786680000126
Product Length/Depth
14.12 in
Product Height
23.31 in
Product Width
16.35 in
Product Weight
380 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
Catalog Notes
Grade 304 stainless steel enclosure
Coil material
Aluminum
Design
EP
Enclosure
NEMA 3R
Frame
182
Tap size
None
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
115 °C rise
Volt ampere rating
25 kVA
Weathershield
Indoor-Outdoor
The S20N11S25SS delivers a 25 kVA single‑phase rating, enabling reliable power conditioning for mid‑size loads in industrial settings. This capacity ensures voltage stability for programmable logic controllers, sensors, and drives without oversizing equipment. The encapsulated design reduces noise and leakage paths, improving panel safety and reliability. In practice, engineers deploy this transformer in machine tools and control panels where compact footprint and predictable performance matter. With primary voltages of 240 V and 480 V and a secondary of 120/240 V, the unit accommodates common US power distribution schemes, simplifying wiring and panel layout. That flexibility supports single‑source procurement and reduces the need for multiple step‑down devices in a retrofit. The 60 Hz frequency aligns with standard industrial equipment, improving compatibility with existing motor starters and drives. The NEMA 3R enclosure provides robust indoor‑outdoor protection, enabling installation on factory floors, outdoors near equipment, or inside protected service rooms. Grade 304 stainless steel enclosure notes add corrosion resistance in harsh environments or coastal locations. The UL Listed certification further reinforces compliance with electrical safety requirements during installation and operation. The aluminum windings offer a favorable balance of electrical performance and weight, easing handling during installation and reducing structural loading. The 182 frame and the 14.12 in depth by 16.35 in width by 23.31 in height footprint support easier integration into standard electrical rooms. With a 380 lb weight, suitable lifting equipment is recommended for safe installation. Designed for continuous operation, the transformer features a 115 °C rise rating and a 60 Hz rating to match typical industrial duty cycles. The 3A wiring connection supports straightforward field wiring and integration with common distribution panels. Overall, it delivers predictable performance, reduced lifecycle costs, and accelerated time‑to‑value on power distribution projects.
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FAQs
Plan for a sturdy mounting site, as the unit weighs 380 lb and uses a frame 182. Use hoisting equipment or a pallet jack to position it safely. Allow space for wiring and service access, then connect with the 3A wiring configuration to simplify panel integration. Use appropriate lifting gear to minimize risk, and verify lifting points align with the heavy frame before movement.
The transformer accepts 240 V or 480 V on the primary and provides 120/240 V on the secondary. It is designed for single-phase, 60 Hz operation, making it compatible with standard industrial controls, relays, and motor starters while maintaining voltage stability under load. Also confirm clearances around the unit to facilitate future maintenance tasks.
Yes. UL Listed for electrical safety, and the unit features a NEMA 3R enclosure suitable for indoor-outdoor use. Weathershield designation confirms protection against weather exposure, while Grade 304 stainless steel enclosure notes add corrosion resistance in demanding environments. This combination supports reliable operation in outdoor substations, equipment yards, and harsh factory floors without extra enclosures.
The S20N11S25SS is rated for 25 kVA, with a 115 °C rise temperature, indicating robust thermal performance under full load. Aluminum windings offer good conductivity and corrosion resistance, while the single-phase design simplifies panel layouts and reduces cooling requirements in typical industrial environments. This supports longer service life and lower energy costs by maintaining safe operating temperatures.
Plan for hoisting equipment and a solid base; the 380 lb weight and 182 frame require secure anchoring and proper clearances. Ensure wiring connections follow the 3A scheme and allow space for service access, cooling, and routine maintenance. Additionally, verify the available space for terminal blocks and conduit entries to simplify field wiring and siting near equipment racks.