Eaton QS20N11S01CU Marine Duty Transformer - UL Listed
Part Number: QS20N11S01CU
Quick Summary
Eaton QS20N11S01CU is a marine duty encapsulated transformer delivering reliable power conversion for vessel electrical systems. Engineers and procurement teams face corrosion risks, space constraints, and stringent regulatory compliance when upgrading onboard power systems. UL Listed protection paired with a NEMA 3R enclosure ensures safe, weather-robust operation in challenging marine environments. With a 1 kVA rating, copper windings, and a 240/480 V primary feeding 120/240 V secondary, it enables scalable, efficient distribution while simplifying installation and service. This combination supports uptime, reduces maintenance, and aligns with standard Eaton catalogs for straightforward procurement.
Product Information
Extended Description
QS20N11S01CU Eaton: Eaton Marine duty encapsulated transformer, marine duty encapsulated transformer, EPM, copper, NEMA 3R, 59A, 60 Hz, single-phase, 240 V, 480 V, 120/240 V, NONE, 115 °C rise, 1 KVA, indoor-outdoor, 3A1Q
Product Name
Eaton Marine duty encapsulated transformer
Catalog Number
QS20N11S01CU
UPC
786680031809
Product Length/Depth
5.75 in
Product Height
11.28 in
Product Width
5.99 in
Product Weight
28 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
59A
Tap size
None
Type
Marine Duty Encapsulated Transformer
Wiring connection
3A1Q
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
1 kVA
Weathershield
Indoor-Outdoor
Commercial Distribution, Transformers, Volume 2, Tab 2
Eaton Specification Sheet - QS20N11S01CU
Selling Policy 25-000 - Distribution and Control Products and Services
The marine-duty encapsulated design uses copper windings (Feature) to deliver high efficiency and reduced heat buildup, translating to lower operating losses (Business Impact) for on-board power systems in yachts and ships (Application). The EPM construction provides rugged reliability in vibration-prone environments, enabling continuous operation under salt spray and humidity (Application) while decreasing lifecycle costs (Business Impact). The NEMA 3R enclosure (Feature) offers indoor-outdoor protection, ensuring weather resistance and safe operation in engine rooms and exposed compartments (Application), which reduces field failures and maintenance visits (Business Impact). A 1 kVA rating with 240/480 V primary and 120/240 V secondary (Feature) supports flexible power distribution for control panels and auxiliary loads (Application), delivering scalable capacity without redesigning electrical rooms (Business Impact). The 60 Hz, single-phase design (Feature) aligns with common marine power systems, simplifying integration and panel downstream wiring (Application) and accelerating project timelines (Business Impact). The 5.75 in × 5.99 in × 11.28 in footprint and 28 lb weight (Feature) enable compact installation in tight engine rooms and prefabricated equipment cages (Application), easing transport, mounting, and service logistics (Business Impact). Compatibility with 3A1Q wiring and a 59A frame (Feature) supports straightforward hook-up to existing harnesses and standard enclosure cutouts (Application), reducing labor costs and installation risk (Business Impact). Weathershield Indoor-Outdoor design (Feature) ensures consistent performance across varying atmospheres, improving uptime in coastal environments (Application) and reducing spares inventory by using a single, versatile transformer (Business Impact). The UL Listed certification (Feature) confirms safety compliance, aiding procurement and QA processes (Application), while the included warranty (Feature) mitigates long-term ownership risk (Business Impact).
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FAQs
Install the unit in a space with adequate ventilation, mounting it as a compact enclosure within the 5.75 in by 5.99 in by 11.28 in footprint. Connect the primary to 240/480 V supply and the secondary to 120/240 V loads using the 3A1Q wiring configuration. Ensure the enclosure remains indoors-outdoors compliant (NEMA 3R) and verify UL Listed safety requirements during commissioning.
The transformer operates at 60 Hz single-phase, with a primary voltage of 240 V or 480 V and a secondary voltage of 120/240 V. It is rated at 1 kVA, suitable for distributing mixed loads in marine systems while maintaining stable voltage conversion across onboard circuits.
Yes. Designed as a marine-duty encapsulated transformer with copper windings and a NEMA 3R enclosure, it withstands coastal environments, vibration, and weather exposure. Its 1 kVA rating and 240/480 V to 120/240 V configuration support onboard control panels, instrumentation, and auxiliary systems with reliable, efficient power delivery.
The QS20N11S01CU is UL Listed and features a NEMA 3R indoor-outdoor enclosure, enabling safe operation in harsh marine environments. Its copper windings and 60 Hz single-phase operation are standard for dependable marine power distribution, while the enclosure design supports protective ingress protection and service accessibility during maintenance.
Eaton provides a warranty under policy 25-000, covering one year from installation or eighteen months from shipment, whichever comes first. This warranty, combined with UL Listing and robust marine design, offers predictable service life and support for maintenance planning and ROI calculations on vessel power systems.