Eaton S57J11S25 Transformer - UL Listed, 25 kVA
Part Number: S57J11S25
Quick Summary
The Eaton S57J11S25 Transformer is a reliable general‑purpose power converter for industrial control panels and power distribution systems. Engineers often struggle with compact, weather‑rated transformers that still deliver consistent regulation and easy installation. UL Listed and housed in a NEMA 3R enclosure, it is designed for indoor‑outdoor service, helping facilities meet safety and environmental requirements. With a 25 kVA rating and a 575 V primary feeding 120/240 V secondary, this single‑phase unit supports scalable automation and panel design. Its rugged aluminum winding and 60 Hz operation deliver efficient energy transfer, reducing footprint and long‑term maintenance costs.
Product Information
Extended Description
S57J11S25 Eaton: Eaton General purpose encapsulated transformer, EP, aluminum, NEMA 3R, 182, 60 Hz, single-phase, 575 V, 120/240 V, 4 at -2.5% FCBN, 115 °C rise, 25 KVA, indoor-outdoor, 527D
Product Name
Eaton General purpose encapsulated transformer
Catalog Number
S57J11S25
UPC
786680091018
Product Length/Depth
14.12 in
Product Height
23.31 in
Product Width
16.35 in
Product Weight
329 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
Aluminum
Design
EP
Enclosure
NEMA 3R
Frame
182
Tap size
4 at -2.5% FCBN
Type
General-Purpose Encapsulated Transformer
Wiring connection
527D
Frequency rating
60 Hz
Phase
Single-phase
Primary voltage
575 V
Secondary Voltage
120/240 V
Temperature rise
115 °C rise
Volt ampere rating
25 kVA
Weathershield
Indoor-Outdoor
Feature: General‑purpose encapsulated transformer design. Business Impact: Provides durable insulation and compact packaging, enabling easier installation in crowded control panels and distribution rooms. Application: Suitable for machine tools, conveyors, and automation enclosures where space is at a premium. Feature: Aluminum coil windings. Business Impact: Reduces weight and improves heat dissipation, lowering installation labor and thermal management costs. Application: Field services and rack‑mounted panels in facilities with space constraints. Feature: NEMA 3R enclosure. Business Impact: Delivers weather resistance and enclosure integrity for indoor‑outdoor deployment, increasing uptime in exposed environments. Application: Exterior switchgear, outdoor control panels, and remote subpanels. Feature: Voltage ratings 575 V primary and 120/240 V secondary at 60 Hz. Business Impact: Matches common industrial distribution systems, simplifying wiring and reducing configuration errors. Application: Powering control circuits and machine logic from high‑voltage mains. Feature: Tap changer 4 at −2.5% FCBN. Business Impact: Improves voltage regulation under load and supply fluctuation, supporting sensitive equipment. Application: Networks with variable input voltages or long feeder runs. Feature: 25 kVA rating with 182 frame and 527D wiring. Business Impact: Scales to mid‑range power needs while preserving compact footprint and reliable connections. Application: Panel boards, distribution centers, and automated lines that demand dependable secondary power.
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FAQs
For proper installation, place the unit in a suitable environment that supports indoor‑outdoor service (NEMA 3R enclosure). Ensure ample clearance for cooling, mount the 182 frame securely, and connect to the 527D wiring interface. Use appropriate shielded cables and follow local electrical codes. Plan for the 60 Hz, single‑phase configuration and the 575 V to 120/240 V secondary distribution. Verify mounting orientation and accessible tap settings (4 at −2.5% FCBN) during commissioning to ensure voltage regulation accuracy.
The unit provides four taps at −2.5% FCBN for voltage adjustment. This feature helps compensate for line losses and load variations, maintaining stable secondary voltages (120/240 V) under fluctuating input (575 V). In practice, it reduces voltage drop at distant loads, improves equipment performance, and minimizes nuisance trips in control circuits and automation equipment.
Yes. The S57J11S25 is a general‑purpose encapsulated transformer designed for panel and control applications. Its 25 kVA rating supports mid‑sized power needs, while the 575 V to 120/240 V secondary configuration feeds logic circuits and actuators. The aluminum windings aid heat dissipation, and the NEMA 3R enclosure supports outdoor installation, enhancing panel versatility in manufacturing floors and remote stations.
The transformer is UL Listed, ensuring compliance with recognized safety standards for electrical equipment. It also features a NEMA 3R enclosure rating, suitable for indoor‑outdoor service. These certifications and ratings support compliance in most industrial facilities and help streamline procurement for safety‑critical power distribution projects.
With a rugged encapsulated design, aluminum windings, and a robust UL Listed/NEMA 3R build, the S57J11S25 minimizes maintenance and service calls. The 25 kVA rating provides scalable power without multiple smaller units, reducing footprint and installation complexity. The one‑year warranty (or 18 months from shipment) offers protection during early operation, while the low heat generation and durable construction support longer intervals between inspections.