Eaton S20N08A81N Buck-Boost Transformer - UL Listed
Part Number: S20N08A81N
Quick Summary
Eaton S20N08A81N general purpose encapsulated transformer powers control panels with buck-boost voltage conversion. Manufacturers struggle with voltage drift and compatibility when sourcing for mixed-voltage equipment. UL Listed, NEMA 3R enclosure, and 60 Hz single‑phase design ensure safe, durable installation in demanding environments. Compact, rugged, and aluminum-wound, it reduces panel space while delivering reliable power for automation systems. Ideal for OEMs and integrators seeking straightforward installation, lifecycle cost reductions, and predictable performance across varying loads. The 0.05 kVA rating targets control-logic circuits and sensing networks without oversizing infrastructure. With secondary 24/48 V outputs and 240/480 V inputs, operators gain flexibility for typical automation panels.
Product Information
Extended Description
S20N08A81N Eaton: Eaton General purpose encapsulated transformer, buck-boost general-purpose encapsulated transformer, EP, aluminum, NEMA 3R, 52, 60 Hz, single-phase, 240 V, 480 V, 24/48 V, NONE, 115 °C rise, 0.05 KVA, indoor-outdoor, 3D
Product Name
Eaton General purpose encapsulated transformer
Catalog Number
S20N08A81N
UPC
786680383205
Product Length/Depth
4 in
Product Height
8.91 in
Product Width
4.11 in
Product Weight
7 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
Model N
Coil material
Aluminum
Design
EP
Enclosure
NEMA 3R
Frame
52
Tap size
None
Type
Buck-Boost General-Purpose Encapsulated Transformer
Wiring connection
3D
Frequency rating
60 Hz
Phase
Single-phase
Primary voltage
240 V, 480 V
Secondary Voltage
24/48 V
Temperature rise
115 °C rise
Volt ampere rating
0.05 kVA
Weathershield
Indoor-Outdoor
Feature: Buck-boost general-purpose encapsulated transformer with 0.05 kVA rating. Benefit: Minimizes panel overdesign, reduces wiring complexity, and stabilizes voltages for sensitive automation circuits. Application: control panels and PLC inputs in manufacturing lines. In practice this means fewer nuisance trips and consistent PLC performance. Feature: Aluminum coil and EP design. Benefit: Enhanced thermal performance and durability in compact footprints; Application: OEM equipment and retrofit projects where space is limited. Feature: NEMA 3R enclosure for indoor-outdoor use. Benefit: Rugged, weather-resilient installation without extra enclosures; Application: outdoor or harsh plant areas with mixed humidity. Feature: 60 Hz single‑phase operation, primary 240/480 V, secondary 24/48 V. Benefit: Flexible integration with standard industrial power rails; Application: machine controls, sensing networks, and automation panels. Feature: 0.05 kVA rating and 4 in by 8.91 in by 4.11 in form factor. Benefit: Light-weight, space-efficient power conditioning for compact control cabinets; Application: modular automation architectures. Feature: Weathershield Indoor-Outdoor. Benefit: Wide operating tolerance and reduced maintenance; Application: industrial environments where ambient conditions vary, improving uptime and total cost of ownership.
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FAQs
Plan for space that accommodates a compact 4 in L x 4.11 in W x 8.91 in H enclosure and consider 3D wiring. Mount within a NEMA 3R protected area to benefit from the indoor-outdoor rating, and ensure proper clearance for venting and servicing. Use appropriate gauge wiring and adhere to UL guidelines for safe connections and service access.
The transformer is a single-phase device rated at 0.05 kVA with 60 Hz operation. Primary voltage accepts 240 V or 480 V, while the secondary provides 24/48 V. Winding material is aluminum, and the device is designed for indoor-outdoor use with a 115 °C rise, supporting reliable performance in typical automation panels.
Yes. The unit features a NEMA 3R enclosure and is specified as indoor-outdoor, enabling installation in exposed or semi-enclosed environments. This reduces the need for extra protection and simplifies layout in facilities where control panels sit near production floors or outside enclosures, while maintaining safety and performance.
The S20N08A81N is UL Listed, confirming compliance with safety standards for electrical equipment. This certification supports qualification for industrial installations, reduces procurement risk, and aligns with quality expectations in regulated manufacturing settings. The enclosure rating and is intended for reliable, long-term operation in demanding environments.
With a compact, lightweight 7 lb footprint and aluminum windings, the transformer offers low-installed cost and reduced cabinet space. The 0.05 kVA rating targets essential control logic with minimal energy loss, while the rugged EP/NEMA 3R design minimizes corrosion and maintenance. A 1-year warranty and UL Listed certification further reduce lifecycle risk for OEMs and integrators.