Eaton S20L11B15CUSS Encapsulated Transformer - UL Listed
Part Number: S20L11B15CUSS
Quick Summary
The Eaton S20L11B15CUSS encapsulated transformer provides reliable power isolation for general industrial controls. Maintenance teams struggle with rugged enclosures and weather exposure; this unit’s Grade 304 stainless steel housing and NEMA 3R rating help meet demanding site requirements. UL Listed certification provides industry-accepted safety and compliance, while its indoor-outdoor design supports flexible installation in panels, MCCs, and transformer enclosures. With a 15 kVA rating and copper windings, it delivers efficient power transfer for control circuitry, lighting feeders, and motors. Designed for 60 Hz operation, 240/480 V primary and 120/240 V secondary, this transformer combines robustness with ease of maintenance and reliable, long-term performance for critical automation systems.
Product Information
Extended Description
S20L11B15CUSS Eaton: Eaton General purpose encapsulated transformer, EP, copper, NEMA 3R, 182, 60 Hz, single-phase, 240 V, 480 V, 120/240 V, 2 at -5% FCBN X 4 at -2.5% FCBN, 80 °C rise, 15 KVA, indoor-outdoor, 23A
Product Name
Eaton General purpose encapsulated transformer
Catalog Number
S20L11B15CUSS
UPC
786680071638
Product Length/Depth
14.12 in
Product Height
23.31 in
Product Width
16.35 in
Product Weight
429 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
Grade 304 stainless steel enclosure
Coil material
Copper
Design
EP
Enclosure
NEMA 3R
Frame
182
Tap size
2 at -5% FCBN x 4 at -2.5% FCBN
Type
General-Purpose Encapsulated Transformer
Wiring connection
23A
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
15 kVA
Weathershield
Indoor-Outdoor
Feature: Encapsulated copper-winding design protects windings from dust, moisture, and ingress. Benefit: Improves reliability and reduces insulation failure risk in harsh environments, cutting maintenance costs. Application: Control panels and distributed power feeds in manufacturing lines and outdoor equipment enclosures. Feature: NEMA 3R indoor-outdoor enclosure with Grade 304 stainless steel construction. Benefit: Weather resistance and corrosion protection extend service life and lower replacement intervals. Application: Outdoor substations, washdown areas, and exposed installations in industrial settings. Feature: 15 kVA, single-phase with 60 Hz operation. Benefit: Sufficient capacity for panel boards and automation feeders while maintaining compact footprint and predictable load handling. Application: Automation cabinets and machine feeders requiring reliable step-down power. Feature: Primary voltage options of 240 V and 480 V; secondary voltage 120/240 V. Benefit: Flexible site connection and compatibility with existing power distribution schemes, reducing rework. Application: Retrofit projects and new installations in mixed-voltage environments. Feature: Tap size 2 at -5% FCBN x 4 at -2.5% FCBN. Benefit: Voltage regulation to accommodate line swings and supply variations, improving voltage stability for sensitive controls. Application: Plants with marginal voltage tolerance or extended feeder runs. Feature: UL Listed with indoor-outdoor readiness and Weathershield enclosure notes. Benefit: Compliance assurance and simplified procurement for regulated environments. Application: Industrial facilities pursuing code adherence and consistent safety documentation. Feature: 80 °C rise rating and 23A wiring connection specification. Benefit: Clear thermal performance expectations and wiring compatibility for installation planning. Application: New builds and retrofits where precise thermal management and wiring schema are required.
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FAQs
Plan for a robust mounting surface capable of supporting 429 lb, with secure enclosure fastenings and adequate clearance for ventilation. The Grade 304 stainless steel enclosure and NEMA 3R rating enable outdoor or damp locations, while the 14.12 in depth and 16.35 in width fit standard panel footprints. Verify wiring routes align with the 23A connection and the dual primary taps.
The S20L11B15CUSS is a single-phase transformer rated at 15 kVA, operating at 60 Hz. Primary voltages are 240 V and 480 V, and the secondary voltage is 120/240 V. It uses copper windings and is designed for indoor-outdoor service with an 80 °C rise and copper winding construction for reliability.
Yes. The enclosure is designed for indoor-outdoor use with a NEMA 3R rating and a Grade 304 stainless steel construction per catalog notes, providing resistance to weather, corrosion, and washdown environments. The Weathershield capability supports rugged installations in factories, yards, and exterior panels.
The transformer is UL Listed, confirming compliance with relevant safety standards for electrical equipment. The NEMA 3R enclosure and stainless steel construction further support regulatory requirements for protective enclosures in industrial settings, reducing audit findings and simplifying project approvals.
With copper windings, durable stainless enclosure, and a robust 15 kVA rating, the unit minimizes insulation failures and reduces maintenance cycles. While upfront weight and installation considerations exist, the UL certification, weather resistance, and long service life translate into lower downtime, predictable performance, and improved uptime for critical automation and power distribution workflows.