Eaton S20L11B37 General-Purpose Transformer - UL Listed
Part Number: S20L11B37
Quick Summary
The Eaton S20L11B37 General-Purpose Transformer provides reliable voltage conversion for distribution and control in industrial facilities. Panel designers and maintenance teams often wrestle with voltage variation, space constraints, and weather exposure in demanding environments. UL Listed certification accompanies a rugged NEMA 3R enclosure, enabling indoor-outdoor operation, while the aluminum coil and 80 °C rise support durable, long-life service. This compact, single-phase transformer delivers a 37.5 kVA rating to power control panels and equipment racks with confidence. With two adjustable taps to accommodate supply variations and a design that fits tight spaces, it simplifies installation, reduces field conditioning needs, and lowers total cost of ownership for power distribution projects.
Product Information
Extended Description
S20L11B37 Eaton: Eaton General purpose encapsulated transformer, EP, aluminum, NEMA 3R, 300A, 60 Hz, single-phase, 240 V, 480 V, 120/240 V, 2 at -5% FCBN X 4 at -2.5% FCBN, 80 °C rise, 37.5 KVA, indoor-outdoor, 248A
Product Name
Eaton General purpose encapsulated transformer
Catalog Number
S20L11B37
UPC
786680027772
Product Length/Depth
14.06 in
Product Height
28.24 in
Product Width
22.42 in
Product Weight
0.001 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
Aluminum
Design
EP
Enclosure
NEMA 3R
Frame
300A
Tap size
2 at -5% FCBN x 4 at -2.5% FCBN
Type
General-Purpose Encapsulated Transformer
Wiring connection
248A
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
37.5 kVA
Weathershield
Indoor-Outdoor
Commercial Distribution, Transformers, Volume 2, Tab 2
Eaton Specification Sheet - S20L11B37
Selling Policy 25-000 - Distribution and Control Products and Services
Encapsulated construction protects windings from dust and moisture, improving reliability in harsh environments and reducing insulation loss over time. Business impact: longer service life and lower maintenance costs for critical control circuits in OEM machines and factory automation. Application: control panels in dirty or damp plant areas benefit from rugged performance and less downtime. Aluminum coil reduces weight and material costs, easing installation and retrofit projects while maintaining electrical performance. Business impact: faster installation and lower crane or labor costs during panel assembly. Application: new builds or expansions where weight and space are at a premium. NEMA 3R Indoor-Outdoor enclosure provides weather resistance and field flexibility, enabling outdoor-rated installations without additional housings. Business impact: expands site options and reduces enclosure footprint in outdoor equipment rooms or sheltered outdoor locations. Application: outdoor motor starters, switchgear, and distributed loads. Tap settings 2 at -5% FCBN x 4 at -2.5% FCBN offer voltage regulation to accommodate nominal supply variations. Business impact: improved voltage accuracy at point of use and fewer downstream condensers or regulators. Application: sites with fluctuating line voltage or long feeders. The 37.5 kVA rating suits medium-load distributions with single-phase needs, ideal for machine panels, processing lines, or localized substations. UL Listed certification ensures compliance and simplifies procurement audits. Business impact: smoother supplier qualification and reduced risk during regulatory reviews. Application: maintenance contracts and compliance-driven procurement in manufacturing, packaging, and automation environments.
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FAQs
For control panel installations, ensure proper mounting within the 14.06 in depth and 22.42 in width footprint, with clearances per local codes. The unit is UL Listed and features a NEMA 3R enclosure for indoor-outdoor use. Use the two taps (-5% and -2.5%) to compensate for minor voltage variations on 240/480 V primary and connect to 120/240 V secondary loads up to 37.5 kVA. Plan for 248A wiring capacity and proper cooling in continuous-duty applications.
Verify 60 Hz frequency, single-phase operation, primary voltages of 240 V and 480 V, and secondary voltage of 120/240 V. Confirm the 37.5 kVA VA rating aligns with your load, and note the dual-tap capability (-5% and -2.5% FCBN) for voltage regulation. The aluminum coil, 80 °C rise, and UL Listed status support durability and compliance in typical industrial environments.
Yes. The S20L11B37 is designed with a NEMA 3R enclosure for indoor-outdoor service and an indoor-outdoor weathershield designation. This enables installation in outdoor equipment rooms or sheltered outdoor locations without additional protective housings. For outdoor use, ensure ambient conditions remain within rated limits and provide appropriate ventilation to sustain performance and longevity.
The transformer follows Eaton Selling Policy 25-000, offering a one-year warranty from installation or an 18-month warranty from shipment, whichever occurs first. Support includes standard manufacturer guidance, access to Eaton datasheets, and downloadable specification sheets. For extended coverage or service-level agreements, contact Eaton or authorized distributors during procurement.
The unit’s 37.5 kVA rating matches moderate-load distribution needs, reducing the number of required transformers and associated copper or aluminum inventory. Aluminum windings lower material costs and weight, facilitating easier installation. The dual-tap regulation minimizes downstream power conditioning, improving overall system efficiency, reducing heat generation, and supporting longer component life in automation panels and processing lines.