Eaton S25N12S03CU General-Purpose Transformer - UL Listed
Part Number: S25N12S03CU
Quick Summary
The Eaton S25N12S03CU general-purpose encapsulated transformer delivers reliable, compact power conversion for control panels and distribution systems. Engineers often struggle with limited space and outdoor exposure, but this unit’s NEMA 3R enclosure and indoor-outdoor protection simplify installation and extend service life. UL Listed safety certification and rugged copper-wound design provide compliance and durable operation across harsh environments, with a 60 Hz single-phase rating that aligns with standard plant power. Featuring a 3 kVA rating and copper windings, it reliably feeds 120 V secondary circuits from a 220 V primary, enabling efficient, maintenance-friendly power for industrial controls and automation equipment.
Product Information
Extended Description
S25N12S03CU Eaton: Eaton General purpose encapsulated transformer, EP, copper, NEMA 3R, 176, 60 Hz, single-phase, 220 V, 120 V, NONE, 115 °C rise, 3 KVA, indoor-outdoor, 511AG
Product Name
Eaton General purpose encapsulated transformer
Catalog Number
S25N12S03CU
UPC
786680062933
Product Length/Depth
8 in
Product Height
14.25 in
Product Width
7.69 in
Product Weight
72 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
Copper
Design
EP
Enclosure
NEMA 3R
Frame
176
Tap size
None
Type
General-Purpose Encapsulated Transformer
Wiring connection
511AG
Frequency rating
60 Hz
Phase
Single-phase
Primary voltage
220 V
Secondary Voltage
120 V
Temperature rise
115 °C rise
Volt ampere rating
3 kVA
Weathershield
Indoor-Outdoor
Feature → Business Impact → Application: Copper windings reduce resistance and improve efficiency, lowering I2R losses and prolonging transformer life, which translates to lower energy costs and less frequent maintenance for critical automation loads. This is especially valuable in control panels that operate continuously, where reliability directly affects production uptime and safety. Long-term operating cost savings are realized in high-availability machines and conveyor systems that demand steady 120 V outputs from a 220 V source. Feature → Business Impact → Application: NEMA 3R enclosure enables indoor-outdoor installation, protecting the transformer from weather and dust ingress while simplifying site placement. This reduces enclosure retrofit needs and accelerates installation in outdoor switchgear rooms or exterior panels, making it ideal for rugged industrial environments and remote facilities. Feature → Business Impact → Application: 3 kVA rating with a 220 V to 120 V secondary supports efficient step-down for multiple circuits, enabling safer control of automation devices and sensors without oversizing downstream components. This helps optimize panel space, lower capital spend, and reduce downtime in machine rooms and packaging lines. Feature → Business Impact → Application: 60 Hz, single-phase operation aligns with common industrial power standards, simplifying integration with existing power distribution and eliminating the need for complex phase-shifting equipment. Applications include machine controls, programmable logic, and motor control centers that demand predictable performance. Feature → Business Impact → Application: 511AG wiring and a compact 8 in × 14.25 in × 7.69 in footprint offer straightforward field termination and cabinet compatibility, reducing installation time and minimizing wiring errors. This supports rapid deployment in retrofit projects, control encloses, and new line builds where space is at a premium. Feature → Business Impact → Application: Durability and warranty support, including UL Listed safety certification and clear Eaton warranty policy, provide risk mitigation for procurement and maintenance planning. This translates to better total cost of ownership, predictable service life, and easier vendor qualification for plant modernization initiatives.
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FAQs
Prioritize mounting in a protected enclosure with the NEMA 3R rating for indoor-outdoor use. Plan for the unit’s 8 in length, 14.25 in height, and 7.69 in width footprint, and account for a 72 lb weight. Use the 511AG wiring connection for field terminations, and ensure a 220 V to 120 V single-phase supply at 60 Hz.
The S25N12S03CU delivers 3 kVA at 60 Hz in a single-phase configuration, stepping down from 220 V primary to 120 V secondary. It uses copper windings, has no tap changer, and supports indoor-outdoor operation with a 115 °C rise rating, aligning with standard industrial loads and stability requirements.
Yes. The transformer is designed for indoor-outdoor use with a NEMA 3R enclosure and Weathershield specification, enabling reliable operation in exposed environments. UL Listed certification further supports safe outdoor deployment in plant exterior panels and protected outdoor enclosures.
The S25N12S03CU is UL Listed, indicating compliance with recognized safety standards. The NEMA 3R enclosure and weather-resistant design complement the certification by ensuring robust performance in both indoor and outdoor installations.
Copper windings and a encapsulated design minimize dust ingress and resistance losses, reducing maintenance needs. The unit comes with Eaton’s warranty policy and is rated for 3 kVA loads, supporting reliable uptime in automation panels and control centers, which translates to a lower total cost of ownership over the equipment’s service life.