Eaton S27N12B51CU General Purpose Transformer - UL Listed
Part Number: S27N12B51CU
Quick Summary
Eaton S27N12B51CU transformer provides reliable, encapsulated power conversion for industrial controls. Engineers often face moisture ingress, space constraints, and voltage variability in harsh environments, which can compromise panel reliability. UL Listed safety certification, rugged NEMA 3R enclosure, and copper windings deliver durable performance in challenging settings. This compact, low-voltage transformer supports 277 V to 120 V control circuits in indoor-outdoor panels, offering a balanced combination of footprint, efficiency, and long-term business value for electrical assemblies and automation systems.
Product Information
Extended Description
S27N12B51CU Eaton: Eaton General purpose encapsulated transformer, EP, copper, NEMA 3R, 58A, 60 Hz, single-phase, 277 V, 120 V, NONE, 80 °C rise, 0.5 KVA, indoor-outdoor, 511DD
Product Name
Eaton General purpose encapsulated transformer
Catalog Number
S27N12B51CU
UPC
786680075483
Product Length/Depth
5.75 in
Product Height
11.28 in
Product Width
5.99 in
Product Weight
26 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
58A
Tap size
None
Type
General-Purpose Encapsulated Transformer
Wiring connection
511DD
Frequency rating
60 Hz
Phase
Single-phase
Primary voltage
277 V
Secondary Voltage
120 V
Temperature rise
80 °C rise
Volt ampere rating
0.5 kVA
Weathershield
Indoor-Outdoor
Feature → Business Impact → Application: Copper windings deliver high efficiency and heat tolerance, reducing energy loss and extending life in hot environments. This directly lowers operating costs in continuous-control applications and minimizes thermal stress on downstream devices. Feature → Robust enclosure → Application: NEMA 3R enclosure enables indoor-outdoor installation, protecting critical windings from moisture and dust while meeting field-suspendable installation standards in industrial rooms and exterior-rated panels. Feature → Fixed winding ratio (277 V to 120 V) → Application: Simple, reliable step-down for control circuits in machine dashboards and building automation, reducing wiring complexity and commissioning time. Feature → 0.5 kVA rating → Application: Suitable for small-to-medium load transformers in PLC panels, ensuring adequate voltage for relays, sensors, and small motors without oversizing. Feature → Copper coil material → Application: Superior electrical characteristics and durability in long-service automation environments. Feature → 60 Hz single-phase operation → Application: Aligns with common utility feeds and control systems, guaranteeing compatibility across standard plant electrical architectures.
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FAQs
It is designed for indoor-outdoor use with a rugged NEMA 3R enclosure and a compact footprint (5.75 in L, 5.99 in W, 11.28 in H). Weighing 26 lb, it fits standard panel openings and mounting patterns. Wiring is straightforward with 511DD connections and no taps, simplifying field installation and reducing wiring errors.
The unit provides 0.5 kVA, single-phase operation at 60 Hz, with a 277 V primary and 120 V secondary. It uses copper windings and has an 80 °C rise rating, suitable for moderate-load control circuits. The fixed 277/120 V ratio minimizes adjustments and simplifies compatibility with common PLC and relay loads.
Yes. The NEMA 3R enclosure plus encapsulated copper windings protect against moisture and dust, enabling indoor-outdoor installations. The 80 °C rise rating supports hotter environments, while UL Listed certification provides safety compliance for panel builders and maintenance teams.
The transformer is UL Listed, ensuring safety compliance for industrial installations. Warranty terms follow Eaton policy 25-000, offering one year from installation or 18 months from shipment, whichever comes first, to cover manufacturing defects and workmanship.
Encapsulated design and copper windings reduce moisture-related failures and maintenance needs, extending service life in automation panels. The compact, lightweight form facilitates quicker installations, lowering labor costs. With UL safety certification and rugged enclosure, you can expect fewer uptime events and a lower total cost of ownership over the asset lifecycle.