Eaton S48D27S51 General-Purpose Transformer - UL Listed
Part Number: S48D27S51
Quick Summary
The Eaton S48D27S51 general purpose encapsulated transformer provides reliable voltage transformation for industrial control panels. Engineers often grapple with limited panel space and voltage variation that disrupts downstream equipment. It carries UL Listed certification and a rugged NEMA 3R enclosure, with epoxy-encapsulated design and aluminum windings for durable indoor-outdoor use. This combination reduces footprint while improving reliability in harsh environments. The unit supports 480 V primary to 277 V secondary operation at 60 Hz, 0.5 kVA, single-phase, and offers tap options to compensate for feed fluctuations. In practice, it strengthens power management in automation projects, lowers maintenance costs, and ensures consistent performance across production lines.
Product Information
Extended Description
S48D27S51 Eaton: Eaton General purpose encapsulated transformer, EP, aluminum, NEMA 3R, 57, 60 Hz, single-phase, 480 V, 277 V, 2 at +2.5% FCAN, 2 at -2.5% FCBN, 115 °C rise, 0.5 KVA, indoor-outdoor, 517P
Product Name
Eaton General purpose encapsulated transformer
Catalog Number
S48D27S51
UPC
786685223452
Product Length/Depth
4.91 in
Product Height
8.97 in
Product Width
4.87 in
Product Weight
17 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
57
Tap size
2 at +2.5% FCAN, 2 at -2.5% FCBN
Type
General-Purpose Encapsulated Transformer
Wiring connection
517P
Frequency rating
60 Hz
Phase
Single-phase
Primary voltage
480 V
Secondary Voltage
277 V
Temperature rise
115 °C rise
Volt ampere rating
0.5 kVA
Weathershield
Indoor-Outdoor
Feature: Epoxy-encapsulated construction with aluminum windings. Business Impact: The encapsulation provides moisture and dust resistance, extending service life in challenging environments and reducing field failures, while aluminum windings offer a lighter, cost-effective alternative to copper without compromising electrical performance. Application: Ideal for control panels and motor starter assemblies in manufacturing floors where exposure to humidity, dust, or washdowns is common. Feature: NEMA 3R enclosure suitability for indoor-outdoor use. Business Impact: Enables safe installation in exposed environments without compromising protection standards, reducing enclosure upgrades and field wiring costs. Application: Suitable for outdoor substations, entry panels, or wash-down areas in food and beverage or packaging lines that demand dependable resilience. Its rugged enclosure also supports conforming with internal wiring harnesses and fast installation in compact cabinets. Feature: 0.5 kVA rating with 480 V primary and 277 V secondary. Business Impact: Enables reliable power for control circuits and automation peripherals, reducing the need for multiple transformers and streamlining BOMs. Application: Ideal for machine tools, vending panels, and small motor loads within distribution cabinets that require stable voltage at standard 60 Hz. Feature: Tap size options of two taps at +2.5% FCAN and two taps at -2.5% FCBN for voltage regulation. Business Impact: Maintains downstream equipment performance under line fluctuations, reducing nuisance trips and enabling tighter process control. Application: Critical for precision electronics, PLC-powered machines, and robotics where voltage stability translates to fewer downtime events. Feature: Lightweight aluminum coil and 17 lb weight with epoxy encapsulation. Business Impact: Easier handling, faster installation, and reduced shipping costs while maintaining electrical performance. Application: OEM panel builders and on-site technicians benefit from simpler retrofits and compact layouts in limited spaces. Feature: Warranty, reliability, and support. Business Impact: One-year warranty from installation or 18 months from shipment provides confidence in long-term operation and reduces risk for OEMs. Application: Good fit for service contracts and retrofit projects in manufacturing and processing environments where uptime is critical.
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FAQs
Begin with a suitable panel location that permits clear access for wiring and proper ventilation. Mount the unit using the 517P wiring connection and secure the enclosure. Connect the primary to 480 V and secondary to 277 V, then configure the two +2.5% FCAN and two -2.5% FCBN taps as needed to stabilize voltage under load. Verify torque specs and test continuity before energizing the circuit.
The S48D27S51 is a 0.5 kVA, single-phase transformer with a 480 V primary and 277 V secondary. It operates at 60 Hz and uses an epoxy-encapsulated design with aluminum windings. The device is UL Listed and features a NEMA 3R indoor-outdoor enclosure, with a 517P wiring connection and 2 taps at +2.5% FCAN and 2 taps at -2.5% FCBN for voltage regulation.
Yes. The transformer uses a NEMA 3R enclosure designed for indoor-outdoor use and is specified as Indoor-Outdoor weatherable. Its epoxy encapsulation and aluminum windings enhance resistance to moisture, dust, and temperature variations, making it a reliable choice for outdoor panels, wash-down areas, and exposed industrial spaces when paired with proper mounting and wiring practices.
The S48D27S51 carries UL Listed certification, indicating compliance with recognized safety standards. It also features an NEMA 3R enclosure suitable for indoor-outdoor installations. These certifications support safe integration into industrial control cabinets, assemblies, and panel boards while aligning with common electrical code requirements.
The encapsulated, aluminum-windings design reduces moisture-related failures and weight simplifies handling, installation, and shipping costs. A 0.5 kVA rating matches many low-power control circuits, helping to consolidate BOMs and minimize part variety. Combined with UL Listed safety and a one-year warranty (or 18 months from shipment), it lowers lifecycle risk and maintenance expenses in automation projects.