Eaton S57D11S25CU General-Purpose Encapsulated Transformer - UL Listed
Part Number: S57D11S25CU
Quick Summary
Eaton S57D11S25CU General-Purpose Encapsulated Transformer powers reliable power conversion for industrial controls and distribution panels. Engineers often face outdoor exposure, tight footprints, and maintenance burdens in harsh environments. UL Listed certification and a NEMA 3R enclosure provide safety and outdoor viability, while copper windings at 60 Hz deliver efficient, low-loss performance. Designed for 575 V primary and 120/240 V secondary, this 25 kVA, single-phase transformer helps streamline procurement with a single, versatile model. By pairing rugged construction with strong data sheet specs, it supports uptime, predictability, and lower total cost of ownership for automation projects.
Product Information
Extended Description
S57D11S25CU Eaton: Eaton General purpose encapsulated transformer, EP, copper, NEMA 3R, 182, 60 Hz, single-phase, 575 V, 120/240 V, 2 at +2.5% FCAN, 2 at -2.5% FCBN, 115 °C rise, 25 KVA, indoor-outdoor, 16AA
Product Name
Eaton General purpose encapsulated transformer
Catalog Number
S57D11S25CU
UPC
786680065118
Product Length/Depth
14.12 in
Product Height
23.31 in
Product Width
16.35 in
Product Weight
424 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 +2.5% FCAN, 2 at -2.5% FCBN
Type
General-Purpose Encapsulated Transformer
Wiring connection
16AA
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 → Business Impact → Application: General-purpose encapsulated design (EP) with copper windings delivers robust reliability and high efficiency, reducing losses and cooling requirements in continuous operation across control cabinets and switchgear. This supports tighter facility footprints and lower energy costs in production lines and machine centers. Application: industrial control panels, manufacturing equipment rooms. Feature → Business Impact → Application: NEMA 3R indoor-outdoor enclosure with Weathershield enables safe outdoor installations and weather resistance, cutting the need for extra enclosures and speeding up site deployment. Result: fewer assembly steps, faster commissioning, and improved resilience for outdoor machinery. Application: outdoor panels, remote substations, and plant enclosures. Feature → Business Impact → Application: 2 tap changers at +2.5% FCAN and -2.5% FCBN allow precise voltage adjustment to maintain stable loads, improving performance for sensitive controls and lighting circuits. Benefit: reduced risk of voltage fluctuations and improved equipment life. Application: facilities with variable input voltages and critical controls. Feature → Business Impact → Application: 25 kVA rating on a single-phase transformer provides substantial instantaneous power for control systems without oversizing, enabling optimized inventory and space planning. Benefit: lower capital spend and simplified procurement. Application: medium-load industrial automation panels and distribution centers. Feature → Business Impact → Application: Copper coil construction and 115 °C rise specification support high thermal performance and reliability in continuous operation, lowering maintenance intervals and extending service life. Application: high-heat environments near motors and drives. Feature → Business Impact → Application: Compact footprint (14.12 in L, 23.31 in H, 16.35 in W) with a 424 lb weight offers integration flexibility in existing cabinets and retrofit projects, reducing layout disruptions. Application: retrofits in legacy panels and new machine installations.
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FAQs
Install the unit in a suitable enclosure compliant with NEMA 3R requirements, ensure proper clearance for ventilation, and connect primary 575 V and secondary 120/240 V leads using the 16AA wiring configuration. Verify torque on taps and follow Eaton mounting guidelines to maintain protection class and rating during operation.
The transformer is a 25 kVA, single-phase device with a 575 V primary and a 120/240 V secondary, operating at 60 Hz. Copper windings support high efficiency, and the unit includes dual taps for ±2.5% voltage adjustment to stabilize load conditions.
Yes. It features a NEMA 3R enclosure designed for indoor-outdoor duty and weather resistance. The Weathershield specification ensures reliable outdoor performance, while UL Listed certification underpins compliance and safety for diverse installation sites.
This transformer supports compliance requirements for many industrial facilities seeking robust, test-proven components integrated into control systems.
Encapsulated copper-wound design minimizes dust ingress and moisture exposure, reducing routine maintenance. The 25 kVA rating and rugged enclosure lower replacement frequency in demanding environments. Pairing a 1-year warranty (or 18 months from shipment) with UL Listed certification helps predict uptime and total cost of ownership for automation projects.