Eaton QS20N11S81CU Marine duty encapsulated transformer - UL Listed
Part Number: QS20N11S81CU
Quick Summary
Eaton QS20N11S81CU marine duty encapsulated transformer provides compact, copper-wound power conversion for rugged onboard electrical systems. Engineers often wrestle with space constraints, corrosion exposure, and safety compliance when selecting marine-grade transformers. This unit is UL Listed and uses a NEMA 3R enclosure for indoor-outdoor service, with copper windings and epoxy encapsulation to resist moisture and vibration. The combination of a 0.05 kVA rating, 60 Hz operation, and a single-phase configuration simplifies panel design and reduces installation complexity. Backed by Eaton's warranty and supported by detailed datasheets, it delivers reliable power distribution without compromising maintenance or scalability.
Product Information
Extended Description
QS20N11S81CU Eaton: Eaton Marine duty encapsulated transformer, marine duty encapsulated transformer, EPM, copper, NEMA 3R, 52, 60 Hz, single-phase, 240 V, 480 V, 120/240 V, NONE, 115 °C rise, 0.05 KVA, indoor-outdoor, 3A050Q
Product Name
Eaton Marine duty encapsulated transformer
Catalog Number
QS20N11S81CU
UPC
786680031731
Product Length/Depth
4 in
Product Height
8.91 in
Product Width
4.11 in
Product Weight
8 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
EPM
Enclosure
NEMA 3R
Frame
52
Tap size
None
Type
Marine Duty Encapsulated Transformer
Wiring connection
3A050Q
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
0.05 kVA
Weathershield
Indoor-Outdoor
Copper coil and epoxy encapsulation deliver high electrical efficiency and rugged mechanical protection, reducing heat buildup and resistance to moisture. This translates to longer service life in harsh marine environments and lower maintenance costs for fleet operators. Ideal for primary distribution in compact engine rooms or weather-exposed panels on boats and offshore equipment. The EPM, copper winding construction and a 0.05 kVA rating ensure reliable step-down from 240/480 V to 120/240 V with minimal losses, supporting stable loads in critical systems. A robust NEMA 3R enclosure provides outdoor resilience against rain, spray, and salt fog, minimizing downtime and corrosion-related failures. Wiring is simplified by the standard 3A050Q connection, making installation straightforward in existing Eaton panels. Compact dimensions (4 in deep, 4.11 in wide, 8.91 in high) and a lightweight 8 lb profile save panel space and enable flexible mounting in tight spaces. The UL Listed certification and Eaton warranty further reduce risk, ensuring predictable maintenance cycles and warranty coverage while enabling scalable distribution across marine applications.
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FAQs
The QS20N11S81CU is a single-phase 0.05 kVA transformer with a 240/480 V primary and 120/240 V secondary, designed for marine service. It uses a copper winding and epoxy encapsulation within a NEMA 3R enclosure suitable for indoor-outdoor installations. Wiring connection 3A050Q supports standard Eaton panels, simplifying integration with existing marine power systems.
Key specs include a 0.05 kVA rating, 60 Hz frequency, single-phase operation, primary voltages of 240 V or 480 V, and secondary voltages of 120 V or 240 V. It features copper windings, an 115 °C rise rating, and a compact footprint. The device is designed for indoor-outdoor use and employs a 3A050Q wiring connection.
Yes. The transformer is built for outdoor exposure with a NEMA 3R enclosure and an indoor-outdoor Weathershield rating. This makes it suitable for decks, engine rooms, and offshore equipment where moisture, salt spray, and temperature variation are considerations. Epoxy encapsulation and a copper winding enhance durability under harsh conditions.
The QS20N11S81CU is UL Listed, providing a recognized safety certification for electrical components. It uses a NEMA 3R enclosure to support indoor-outdoor applications. While CE or IP ratings are not listed in the provided data, UL Listing and the NEMA 3R enclosure address key regulatory and installation requirements for marine environments.
Encapsulated copper-wound design minimizes moisture ingress and vibration-related wear, reducing maintenance needs and downtime. The compact 8 lb unit saves space and simplifies installation, contributing to faster commissioning. A one-year Eaton warranty from installation (or 18 months from shipment) provides predictable risk management and supports a favorable total cost of ownership for marine fleets.