Eaton QS20N11S25CU Marine Encapsulated Transformer - UL
Part Number: QS20N11S26CU
Quick Summary
Eaton QS20N11S25CU marine duty encapsulated transformer provides reliable power conversion for onboard electrical systems. Engineers often struggle with moisture, salt spray, and space constraints that threaten equipment uptime. UL Listed certification and a NEMA 3R enclosure ensure safety and weather resistance in indoor-outdoor environments. The 25 kVA, 60 Hz, single-phase design with primary 240/480 V and secondary 120/240 V delivers versatile, scalable power for marine applications while copper windings support high efficiency and longevity. With a compact footprint, rugged encapsulation, and Eaton's proven installation compatibility, it helps reduce commissioning time and spare-part complexity. This guidance-ready spec sheet and supporting datasheets simplify procurement for OEMs and shipowners.
Product Information
Extended Description
QS20N11S26CU Eaton: Eaton Marine duty encapsulated transformer, marine duty encapsulated transformer, EPM, copper, NEMA 3R, 56, 60 Hz, single-phase, 240 V, 480 V, 120/240 V, NONE, 115 °C rise, 0.25 KVA, indoor-outdoor, 3A250Q
Product Name
Eaton Marine duty encapsulated transformer
Catalog Number
QS20N11S26CU
UPC
786680031779
Product Length/Depth
4.06 in
Product Height
8.97 in
Product Width
4.87 in
Product Weight
12 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
56
Tap size
None
Type
Marine Duty Encapsulated Transformer
Wiring connection
3A250Q
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
0.25 kVA
Weathershield
Indoor-Outdoor
Feature: Marine-duty encapsulation with copper windings delivers robust moisture resistance and thermal performance in harsh sea environments. Business impact: reduces unplanned downtime, extends transformer life, and lowers maintenance costs. Application: ideal for shipboard power distribution, engine rooms, and outdoor equipment where exposure to salt spray is routine. Feature: NEMA 3R enclosure and indoor-outdoor weathershield provide rugged protection without enclosure clutter. Impact: simplifies outdoor installation and compliance with weather-related safety standards. Application: suitable for dockside cabinets, weather-exposed control panels, and offshore platforms. Feature: 25 kVA rating with 240/480 V primary and 120/240 V secondary supports flexible power routing. Impact: enables multi-volt compatibility across onboard systems and reduces the number of transformers required. Application: marine propulsion systems, lighting, pumps, and HVAC controls. Feature: 60 Hz single-phase operation and 115 °C rise specification ensures compatibility with common ship electrical systems and acceptable thermal performance. Impact: reduces heat buildup in panels and improves safety margins. Application: utility rooms, bridge electronics, and corporate harbor installations. Feature: Copper windings and UL Listing with warranty terms deliver energy efficiency and regulatory compliance. Impact: lowers lifecycle costs and eases procurement for maritime OEMs. Application: ships, ferries, and offshore vessels seeking reliable, certified power conversion.
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FAQs
Plan for indoor-outdoor placement using the NEMA 3R enclosure and ensure adequate clearance around the transformer. Use the 128A25Q wiring connection, and note there are no tap changes; follow the Eaton installation guide for mounting and venting to maintain cooling.
The unit is a 25 kVA, 60 Hz, single-phase transformer with a 240/480 V primary and a 120/240 V secondary. Copper windings provide high efficiency, and it has a 115 °C rise rating for stable temperature performance.
Yes. The encapsulated design with NEMA 3R enclosure and indoor-outdoor Weathershield is rated for marine conditions and weather exposure, making it appropriate for offshore platforms, marinas, and shipboard installations.
The unit is UL Listed, supporting compliance with safety and electrical standards essential for maritime equipment and facilitating regulatory acceptance in many shipyards and fleets.
Encapsulation and rugged construction reduce maintenance cycles, minimize leakage, and extend service life. The 25 kVA rating supports multiple onboard loads, lowering the need for additional transformers and improving overall system uptime.