Eaton S20P11S03 General-Purpose Encaps Transformer - NEMA3R
Part Number: S20P11S03
Quick Summary
Eaton S20P11S03 is a general-purpose encapsulated transformer that provides reliable low-voltage power for industrial control panels and equipment rooms. It addresses field corrosion, enclosure exposure, and installation flexibility by using an aluminum coil and a rugged NEMA 3R enclosure with broad primary/secondary tap options. UL Listed certification ensures electrical safety, 60 Hz operation matches standard industrial power, and a 3 kVA rating supports routine control-power needs. This solution simplifies procurement for power distribution in harsh environments, reduces maintenance cycles, and helps ensure regulatory compliance. With indoor-outdoor versatility and compatibility with common panel designs, it delivers predictable performance for OEMs and engineers alike.
Product Information
Extended Description
S20P11S03 Eaton: Eaton General purpose encapsulated transformer, EP, aluminum, NEMA 3R, 176, 60 Hz, single-phase, 240 V, 480 V, 120/240 V, 1 at +5% FCAN, 2 at -5% FCBN X 2 at +2.5% FCAN, 4 at -2.5% FCBN, 115 °C rise, 3 KVA, indoor-outdoor, 121A
Product Name
Eaton General purpose encapsulated transformer
Catalog Number
S20P11S03
UPC
786685366081
Product Length/Depth
8 in
Product Height
14.25 in
Product Width
7.69 in
Product Weight
66 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
176
Tap size
1 at +5% FCAN, 2 at -5% FCBN x 2 at +2.5% FCAN, 4 at -2.5% FCBN
Type
General-Purpose Encapsulated Transformer
Wiring connection
121A
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
3 kVA
Weathershield
Indoor-Outdoor
Feature → Business Impact → Application: Robust enclosure and aluminum coil construction deliver superior weather resistance and corrosion protection, extending service life in demanding environments and reducing replacement costs for panel builders and OEMs. This enables reliable power delivery in outdoor cabinets and damp facilities, minimizing downtime on critical automation lines. Feature → Application compatibility → System integrations: NEMA 3R enclosure, UL Listed certification, and 60 Hz operation ensure seamless integration with standard industrial power systems, lowering installation risk and accelerating project timelines for machine builders. Feature → Tap settings → Regulation control: The 1 at +5% FCAN, 2 at -5% FCBN, 2 at +2.5% FCAN, and 4 at -2.5% FCBN taps provide precise voltage regulation, reducing under- and over-voltage events in PLCs and HMI power rails. Feature → Voltage sizing → Energy efficiency: 3 kVA rating matches typical control-power loads, improving efficiency in control panels and reducing cabinet heat output, which can extend component life and lower cooling costs. Feature → Construction and warranty → Risk mitigation: Aluminum coils, indoor-outdoor capability, and a one-year Eaton warranty offer predictable maintenance intervals and protection against unplanned downtime. These aspects support compliance with system design standards while enabling straightforward retrofits in existing facilities.
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FAQs
The S20P11S03 is designed for single-phase installations with 240/480 V primary and 120/240 V secondary, matching common control-panel architectures. Its NEMA 3R enclosure supports indoor-outdoor use, and the UL-listed designation adds safety compliance. When planning installation, verify panel clearances, wire gauge for 121A wiring, and tap settings to minimize voltage drift during load transients.
Key specs include 3 kVA power rating, 60 Hz frequency, aluminum coil, temperature rise of 115 °C, and NEMA 3R enclosure. These features translate to reliable control power under load, improved heat management, and weather resistance. The wide primary and secondary voltage options plus multiple taps help maintain stable output even with input fluctuations.
Best suited for industrial control panels, OEM equipment power supplies, and distributed plant power in environments with exposure to dust, moisture, or temperature variation. Its indoor-outdoor capability, 3 kVA rating, and UL Listed status make it ideal for automation decks, machine control systems, and panel-building projects requiring robust, regulated low-voltage power.
This transformer carries UL Listed certification and uses a NEMA 3R enclosure rated for indoor-outdoor use, which supports compliance with many electrical safety and environmental standards in industrial facilities. The 60 Hz, single-phase design aligns with common US power systems, while the voltage-tap options help achieve precise regulation within approved tolerances.
By leveraging a rugged aluminum coil and a weather-resistant NEMA 3R enclosure, maintenance intervals are extended and field failures are reduced, translating to lower downtime costs. The 3 kVA rating matches typical control loads, enabling energy efficiency in power distribution and potentially lowering cooling requirements. UL Listing further supports long-term reliability and safer operation.