Eaton S20N18S03 General-Purpose Transformer - UL Listed
Part Number: S20N18S03
Quick Summary
The Eaton S20N18S03 is a general-purpose encapsulated transformer designed to reliably power control panels and industrial equipment. This compact solution helps engineers overcome space constraints and wiring challenges in modern automation environments. UL Listed and a NEMA 3R enclosure provide regulatory and environmental confidence, while the indoor-outdoor rating supports versatile placements. With aluminum windings, a 3 kVA rating, and a footprint of 8 in by 14.25 in by 7.69 in, it delivers durable performance with straightforward installation. The result is a lower total cost of ownership through improved efficiency, reduced maintenance, and faster project delivery for power management and distribution applications.
Product Information
Extended Description
S20N18S03 Eaton: Eaton General purpose encapsulated transformer, EP, aluminum, NEMA 3R, 176, 60 Hz, single-phase, 240 V, 480 V, 208/416 V, NONE, 115 °C rise, 3 KVA, indoor-outdoor, 3AA
Product Name
Eaton General purpose encapsulated transformer
Catalog Number
S20N18S03
UPC
786680094125
Product Length/Depth
8 in
Product Height
14.25 in
Product Width
7.69 in
Product Weight
67 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
None
Type
General-Purpose Encapsulated Transformer
Wiring connection
3AA
Frequency rating
60 Hz
Phase
Single-phase
Primary voltage
240 V, 480 V
Secondary Voltage
208/416 V
Temperature rise
115 °C rise
Volt ampere rating
3 kVA
Weathershield
Indoor-Outdoor
Feature: 3 kVA, single-phase, 60 Hz operation. Business Impact: Delivers sufficient headroom for typical control loads and small drives, reducing the need for multiple transformers and simplifying panel layouts. Application: Ideal for machine controllers, PLC racks, and automation cabinets in manufacturing lines. Feature: Aluminum coil construction. Business Impact: Enhances durability while reducing weight and corrosion risk, improving transportability and service life in damp or dusty environments. Application: Suitable for field installation in industrial facilities with variable environmental conditions. Feature: NEMA 3R enclosure with indoor-outdoor suitability. Business Impact: Enables reliable operation in exposed or semi-exposed spaces, reducing enclosure-related failures and maintenance. Application: Outdoor-rated control houses, sheltered outdoor equipment, and mixed-use plant areas. Feature: Primary voltage options 240/480 V and secondary 208/416 V. Business Impact: Provides wiring flexibility for mixed-voltage facilities, simplifying power distribution without additional adapters. Application: Panel boards and equipment racks supporting diverse supply configurations. Feature: 8 in length, 14.25 in height, 7.69 in width; 67 lb weight. Business Impact: Compact footprint and manageable weight streamline installation and service, saving space and labor costs. Application: Retrofit projects and new installations where space constraints are a critical consideration. Feature: 3AA wiring connection; 115 °C rise; 60 Hz; UL Listed. Business Impact: Clear wiring scheme, predictable thermal performance, and regulatory compliance reduce commissioning time and risk. Application: Industrial panels requiring robust, code-compliant transformers with straightforward wiring. Feature: Indoor-outdoor, 3KVA, EP design. Business Impact: Combines rugged enclosure with energy-efficient operation, supporting long service life and lower operational risk. Application: Facilities with mixed indoor-outdoor layouts and variable environmental exposure.
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FAQs
For installation, account for the transformer’s 8 in L x 14.25 in H x 7.69 in W footprint and 67 lb weight. Use the 3AA wiring connection and plan for proper clearance around the enclosure. The NEMA 3R, UL Listed package suits both indoor and outdoor panels, reducing the need for separate enclosures in many layouts.
This transformer is rated at 3 kVA, single-phase, 60 Hz. Primary voltages are 240 V or 480 V with a secondary of 208/416 V. The temperature rise rating is 115 °C, and the winding material is aluminum. These specs support reliable power isolation for PLCs, relays, and small motor loads in automation panels.
Yes. The S20N18S03 features an indoor-outdoor Weathershield and a NEMA 3R enclosure, making it suitable for environments that require weather resistance and durable protection for control gear located outside sheltered areas or on factory exteriors.
The transformer is UL Listed, signaling compliance with recognized safety standards for electrical equipment. This, combined with the NEMA 3R enclosure and epoxy or EP design, supports regulatory acceptance in many regional electrical installation codes and helps streamline procurement in regulated projects.
With a 3 kVA rating and aluminum windings, the S20N18S03 delivers efficient power transfer with minimal copper maintenance and corrosion risk. Its rugged enclosure reduces field failures, lowering downtime and service costs, while the UL listing and warranty support predictable performance over the product’s lifecycle.