Eaton S20N11B03CU Transformer - UL Listed
Part Number: S20N11B03CU
Quick Summary
Eaton S20N11B03CU transformer delivers safe voltage transformation and isolation for control panels and automation equipment. Many engineers struggle with bulky enclosures, inconsistent voltages, and limited indoor-outdoor capability in demanding facilities. This unit leverages UL Listed certification, a rugged NEMA 3R enclosure, and copper windings to deliver reliability in challenging environments. With a 3 kVA rating, single-phase operation, and 240/480 V primary to 120/240 V secondary, it simplifies sourcing and reduces spare parts. Designed for integration with existing Eaton catalogs and standard wiring connections, it offers a clear path to improved uptime, predictable maintenance, and lower total-cost-of-ownership.
Product Information
Extended Description
S20N11B03CU Eaton: Eaton General purpose encapsulated transformer, EP, copper, NEMA 3R, 177, 60 Hz, single-phase, 240 V, 480 V, 120/240 V, NONE, 80 °C rise, 3 KVA, indoor-outdoor, 3A
Product Name
Eaton General purpose encapsulated transformer
Catalog Number
S20N11B03CU
UPC
786680080784
Product Length/Depth
9.89 in
Product Height
16 in
Product Width
10.38 in
Product Weight
119 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
177
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
80 °C rise
Volt ampere rating
3 kVA
Weathershield
Indoor-Outdoor
Copper windings improve efficiency and thermal performance, reducing copper loss and helping maintain stable secondary voltage under load. Business impact: lower energy waste, cooler operation, longer service life and reduced risk of unplanned downtime. Application: control panels and automation equipment in conveyors or machine tools. Encapsulated design provides robust insulation and weather resistance, with an 80 °C rise rating to support sustained loading. Business impact: enhanced reliability in hot factory zones and easier thermal management. Application: harsh or crowded electrical rooms where space and protection matter. NEMA 3R enclosure with Weathershield allows indoor-outdoor service, minimizing maintenance and protection gaps. Business impact: simplified outdoor installations, fewer weather‑related failures, and faster commissioning. Application: outdoor equipment rooms and semi-exposed plant areas. The 3 kVA rating and 240/480 V primary to 120/240 V secondary outputs provide versatile load support across a range of automation devices. Business impact: scalable power distribution, reduced part variety, and improved energy planning. Application: panel builders and system integrators integrating legacy and new machines. Compact footprint and compatible wiring connections (3A) reduce installation time and mounting constraints. Business impact: faster retrofits and lower labor costs. Application: modular automation upgrades in existing plants. Industry relevance: high reliability under fluctuating loads, safety compliance, and lower lifecycle costs through durable copper windings and proven Eaton design.
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FAQs
To install, mount the transformer in a suitable enclosure, connect the primary to 240 V or 480 V, and wire the secondary to 120/240 V loads, using the listed 3A wiring connection. Follow electrical codes and Eaton's catalog guidelines (S20N11B03CU). Ensure proper ventilation for the 80 °C rise rating and confirm panel clearances. Use proper torque on terminals and verify insulation integrity.
Primary voltages are 240 V and 480 V, while the secondary outputs are 120 V and 240 V. This arrangement provides isolation and step-down for control circuits, minimizing voltage stress on components. The unit operates at 60 Hz, ensuring compatibility with common industrial equipment. Verify load compatibility and regulation under peak loading to maintain performance.
Yes, the transformer is designed for indoor-outdoor service with a NEMA 3R enclosure that provides weather resistance for rain and incidental moisture. The copper windings and encapsulated design further enhance durability in variable temperatures and industrial environments. Proper installation should still account for local conditions and any derating recommendations for extended outdoor operation.
The S20N11B03CU is UL Listed, ensuring compliance with established safety standards for electrical equipment. Its NEMA 3R enclosure rating supports outdoor or semi-outdoor installation. Always verify compatibility with local electrical codes and industry-specific requirements before deployment, and reference Eaton’s documentation for installation and maintenance guidance.
Copper windings and robust encapsulation deliver low thermal losses and high reliability, contributing to extended service life and reduced maintenance intervals. The 3 kVA rating supports scalable loads, while UL Listing and a weather-rated enclosure help ensure regulatory compliance. Regular enclosure inspections, connection torque checks, and adherence to Eaton’s warranty terms support steady uptime and predictable lifecycle costs.