Eaton S20K11S03CU Transformer - UL Listed, NEMA 3R
Part Number: S20K11S03CU
Quick Summary
The Eaton S20K11S03CU Transformer provides general-purpose power conversion for control panels and industrial equipment. Engineers frequently face enclosure limitations and voltage matching challenges that threaten uptime. It is UL Listed and features a rugged NEMA 3R enclosure for reliable indoor-outdoor service, supporting 60 Hz operation in harsh environments. By combining robust performance with easy installation and voltage-tap flexibility, this transformer delivers tangible value for panel builders and maintenance teams, helping reduce downtime and improve energy efficiency in industrial automation projects.
Product Information
Extended Description
S20K11S03CU Eaton: Eaton General purpose encapsulated transformer, EP, copper, 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
S20K11S03CU
UPC
786680032967
Product Length/Depth
8 in
Product Height
14.25 in
Product Width
7.69 in
Product Weight
73 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
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
Copper windings offer higher efficiency and lower heat generation, translating to cooler operation and reduced energy costs in continuous-duty installations. The encapsulated design with a NEMA 3R enclosure delivers rugged protection for indoor-outdoor environments, minimizing enclosure-related maintenance and letting you site this unit in exposed areas without extra housing. The transformer provides 1 tap at -10% FCBN and 2 taps at -5% FCBN, enabling precise voltage adjustment to maintain regulation across fluctuating supply conditions. A 3 kVA rating paired with 240/480 V primary and 120/240 V secondary voltages supports versatile deployment across machines, PLCs, and control panels, improving compatibility and reducing the need for multiple devices. The 60 Hz single-phase configuration aligns with standard industrial power systems, simplifying installation and reducing total cost of ownership. Weights, dimensions, and a compact frame in 176 ensure straightforward mounting and serviceability, while UL Listed certification reinforces compliance across regulated environments. These features collectively deliver reliability, predictable performance, and lower maintenance costs for automation projects.
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FAQs
For reliable operation, mount the 176-frame encapsulated transformer in a secure, ventilated enclosure compatible with NEMA 3R. Ensure adequate clearance for cooling, route primary and secondary conductors with appropriate insulation, and use the 1 at -10% and 2 at -5% FCBN taps to fine-tune voltage during commissioning. The unit is rated for indoor-outdoor use, reducing the need for additional housing in exposed areas.
Primary voltage options are 240 V or 480 V, while the secondary provides 120/240 V. This makes the S20K11S03CU suitable for supplying low-voltage loads from standard industrial mains. Use the tap settings to compensate for voltage drop or fluctuations and maintain stable output to PLCs, relays, and control devices across varying line conditions.
Yes. The S20K11S03CU utilizes a general-purpose encapsulated design with a NEMA 3R enclosure and an indoor-outdoor capability, which supports safe operation in environments exposed to moisture and moderate contaminants. This reduces the need for additional protective housings and simplifies installation in outdoor or semi-exposed panel enclosures.
The transformer is UL Listed, indicating compliance with recognized safety standards for electrical devices. The NEMA 3R enclosure further confirms suitability for indoor-outdoor applications in rugged environments. These certifications help streamline procurement, safety audits, and regulatory compliance in industrial facilities.
Copper windings and encapsulated construction reduce core losses and heat, contributing to improved efficiency and longer service life. The rugged enclosure and standard 60 Hz single-phase design enable straightforward installation and routine maintenance, lowering downtime during inspections and replacements. The 3 kVA rating supports scalable power distribution for growing automation needs.