Eaton S20L11S05 General-Purpose Transformer - NEMA 3R
Part Number: S20L11S05
Quick Summary
The Eaton S20L11S05 General-Purpose Transformer is designed for indoor and outdoor power distribution. Facilities often struggle with reliability and installation complexity when selecting transformers for mixed environments; this model reduces risk with a rugged NEMA 3R enclosure, UL Listing, and flexible voltage options. UL Listed and designed with a NEMA 3R enclosure, it supports reliable operation in harsh conditions. With a 5 kVA rating and 60 Hz single-phase design, it supports 240/480 V primary to 120/240 V secondary, delivering consistent power for panels, switchgear, and outdoor equipment. The aluminum winding, 115 °C rise, and versatile tap connections simplify installation, reduce losses, and improve serviceability in common industrial footprints.
Product Information
Extended Description
S20L11S05 Eaton: Eaton General purpose encapsulated transformer, EP, aluminum, NEMA 3R, 177, 60 Hz, single-phase, 240 V, 480 V, 120/240 V, 2 at -5% FCBN X 4 at -2.5% FCBN, 115 °C rise, 5 KVA, indoor-outdoor, 23A
Product Name
Eaton General purpose encapsulated transformer
Catalog Number
S20L11S05
UPC
786680083167
Product Length/Depth
9.89 in
Product Height
16 in
Product Width
10.38 in
Product Weight
111 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
177
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
115 °C rise
Volt ampere rating
5 kVA
Weathershield
Indoor-Outdoor
Encapsulated EP construction protects windings and reduces moisture intrusion, boosting reliability in damp environments and minimizing maintenance needs for control panels and outdoor cabinets. Aluminum coil windings enhance heat dissipation and service life, delivering stable output and improved efficiency in high-load scenarios such as motor control centers and distributed power racks. The NEMA 3R enclosure provides outdoor-ready protection against dust, moisture, and corrosion, enabling safe operation in exposed installations and harsh environments without compromising accessibility. Dual primary voltages of 240/480 V and secondary voltages of 120/240 V offer flexible deployment in plants with mixed electrical systems, reducing inventory and simplifying wiring during upgrades or expansions. The 2 at -5% FCBN x 4 at -2.5% FCBN tap changer supports precise voltage regulation under load, improving panel voltage stability and protecting sensitive equipment. A 5 kVA rating at 60 Hz covers common distribution needs for control panels, switchgear, and small industrial feeders, while the compact footprint and 111 lb weight ease installation and mounting in tight spaces. These features together deliver measurable uptime improvements, reduced energy losses, and straightforward serviceability across industrial environments.
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FAQs
Yes. The S20L11S05 is designed for both indoor and outdoor installations, featuring a NEMA 3R enclosure that protects against dust and moisture. Its compact footprint and 111 lb weight simplify mounting in control panels or dedicated transformer enclosures, while the dual voltage capability reduces wiring complexity during panel upgrades.
The transformer uses 240/480 V primary voltage and produces 120/240 V secondary voltage. It includes a 2 at -5% FCBN x 4 at -2.5% FCBN tap configuration, enabling voltage adjustment to compensate for load variations and long feeder runs, which helps maintain voltage stability and protect downstream equipment.
Absolutely. The combination of EP encapsulation, aluminum windings, and a NEMA 3R enclosure makes it well-suited for harsh environments. UL Listed certification further supports compliance with demanding industrial standards, while its 5 kVA rating provides reliable power for control panels and small distribution feeders in such settings.
This unit is UL Listed and features a NEMA 3R enclosure, which is recognized for indoor-outdoor protection. These certifications and protections support compliance with electrical codes for both indoor panel installations and outdoor applications, reducing the need for additional protective enclosures in many environments.
The encapsulated EP design minimizes exposure to moisture and contaminants, lowering maintenance needs and extending service life. The aluminum windings offer dependable thermal performance, while the multi-tap voltage adjustment reduces stress on feeders during loading changes. With a standard warranty and sturdy construction, the unit supports cost-effective operation and uptime improvements.