Eaton S20K11S03N Encapsulated Transformer - UL Listed
Part Number: S20K11S03N
Quick Summary
The Eaton S20K11S03N Encapsulated Transformer provides reliable 3 kVA power for control panels and machinery. Engineers often struggle with harsh environments where equipment must survive moisture and temperature swings. UL Listed safety certification and a NEMA 3R enclosure rating support reliable indoor-outdoor installations. This compact unit uses an aluminum coil and a 176 frame to fit standard enclosures without compromising performance. By simplifying installation and ensuring stable voltages, it helps reduce downtime, save wiring costs, and improve panel reliability for industrial automation. Its weather-resilient design lowers maintenance needs and extends service life in challenging manufacturing environments. This makes it a practical, cost-conscious choice for a wide range of automation and control applications.
Product Information
Extended Description
S20K11S03N Eaton: Eaton General purpose encapsulated transformer, EP, aluminum, NEMA 3R, 176, 60 Hz, single-phase, 240 V, 480 V, 120/240 V, 1 at -10% FCBN X 2 at -5% FCBN, 115 °C rise, 3 KVA, indoor-outdoor, 9A
Product Name
Eaton General purpose encapsulated transformer
Catalog Number
S20K11S03N
UPC
786680102271
Product Length/Depth
8 in
Product Height
14.25 in
Product Width
7.69 in
Product Weight
63 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
Model N
Coil material
Aluminum
Design
EP
Enclosure
NEMA 3R
Frame
176
Tap size
1 at -10% FCBN x 2 at -5% FCBN
Type
General-Purpose Encapsulated Transformer
Wiring connection
9A
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
3 kVA
Weathershield
Indoor-Outdoor
The transformer delivers 3 kVA of power in a single-phase encapsulated package with dual primary voltages of 240 V or 480 V and a secondary of 120/240 V, enabling isolated, clean power for control circuits. This configuration reduces voltage noise and cross-talk between loads, enhancing system reliability and protecting sensitive electronics in control panels and automation equipment. The NEMA 3R enclosure supports indoor-outdoor service, allowing outdoor or damp-location installations without extra housings, which speeds commissioning and reduces materials cost for outdoor control cabinets. Aluminum coil construction provides corrosion resistance and lighter weight, translating to easier handling and longer service life in humid or coastal environments. Tap changes (1 at -10% FCBN and 2 at -5% FCBN) allow fine voltage tuning to match load conditions, improving regulation at the point of use and reducing energy waste in variable-load systems. UL Listed certification ensures safety compliance, while a compact 176 frame with dimensions of 8 in length, 14.25 in height, and 7.69 in width simplifies cabinet integration. Temperature rise rated at 115 °C supports reliable continuous operation, while 60 Hz compatibility matches common North American utility specifications, delivering predictable performance for motors, PLCs, sensors, and I/O modules. The Eaton warranty policy (one year from installation or 18 months from shipment, whichever occurs first) provides added confidence for project budgeting and maintenance planning.
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FAQs
Yes. The transformer uses a NEMA 3R enclosure suitable for indoor-outdoor service, making outdoor control cabinets viable without additional protective enclosures. Ensure proper mounting, clearance for heat dissipation, and ventilation in the cabinet to maintain reliable operation in varied climates.
The unit offers 240 V or 480 V primary voltage at 60 Hz and a 120/240 V secondary, delivering 3 kVA of power in a single-phase configuration suitable for control panels and automation loads.
Ideal for control panels, machine automation, and PLC power supplies on production lines. Its encapsulated design, rugged enclosure, and adjustable taps support reliable operation in both indoor cabinets and outdoor enclosures, reducing wiring complexity and improving voltage stability across varied loads.
The S20K11S03N is UL Listed for safety compliance and features a NEMA 3R enclosure suitable for indoor-outdoor use, aligning with many industrial procurement standards and installation requirements.
With aluminum coil construction, a robust 176 frame footprint, and a 115 °C rise rating, the unit offers durable, low-maintenance operation. The warranty—one year from installation or 18 months from shipment—helps manage risk in budgeting and maintenance planning, supporting a favorable total cost of ownership.