Eaton QS20N11S76CU Marine Duty Encapsulated Transformer - UL Listed
Part Number: QS20N11S76CU
Quick Summary
The Eaton QS20N11S76CU Marine Duty Encapsulated Transformer delivers compact, reliable power conversion for marine electrical systems. Engineers contend with harsh environments, vibration, and limited space; this transformer’s encapsulated design and NEMA 3R enclosure help mitigate corrosion and installation challenges. UL Listed certification and a 0.75 kVA rating, paired with 60 Hz operation and copper windings, reinforce compliance and durability. With indoor-outdoor versatility and a small footprint, it simplifies spare parts management while delivering consistent performance. This translates to lower downtime, predictable maintenance costs, and improved system reliability for boatyards, offshore platforms, and other marine applications.
Product Information
Extended Description
QS20N11S76CU Eaton: Eaton Marine duty encapsulated transformer, marine duty encapsulated transformer, EPM, copper, NEMA 3R, 58A, 60 Hz, single-phase, 240 V, 480 V, 120/240 V, NONE, 115 °C rise, 0.75 KVA, indoor-outdoor, 3A750Q
Product Name
Eaton Marine duty encapsulated transformer
Catalog Number
QS20N11S76CU
UPC
786680031793
Product Length/Depth
5.75 in
Product Height
11.28 in
Product Width
5.99 in
Product Weight
27 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
58A
Tap size
None
Type
Marine Duty Encapsulated Transformer
Wiring connection
3A750Q
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
0.75 kVA
Weathershield
Indoor-Outdoor
Commercial Distribution, Transformers, Volume 2, Tab 2
Eaton Specification Sheet - QS20N11S76CU
Selling Policy 25-000 - Distribution and Control Products and Services
Feature: Marine duty encapsulated design with copper windings and a 0.75 kVA rating. Business Impact: Higher reliability in harsh conditions, improved thermal performance, and reduced risk of insulation failure in salt-air environments. Application: Powering critical loads on vessels and offshore equipment where resilience matters. Feature: NEMA 3R enclosure and Weathershield capability for indoor-outdoor use. Business Impact: Superior weather resistance and corrosion protection, enabling year-round operation with fewer enclosure-related failures. Application: Outdoor electrical rooms, exposed deck installations, and shore-side marinas. Feature: Primary voltages of 240 V and 480 V with secondary 120/240 V at 60 Hz single-phase. Business Impact: Broad compatibility with standard marine panels and distribution systems, simplifying design and reducing custom wiring. Application: Shipboard power distribution and marina infrastructure. Feature: Compact footprint (5.75 in L × 5.99 in W × 11.28 in H) and 27 lb weight. Business Impact: Easier installation in tight spaces, lower mounting costs, and simplified inventory management. Application: Compact electrical rooms and space-constrained equipment bays. Feature: Wiring connection 3A750Q, with no voltage taps; Frame 58A. Business Impact: straightforward wiring and reliable, repeatable connections, reducing commissioning time and field errors. Application: Routine maintenance and panel upgrades in marine installations. Feature: UL Listed certification and a robust warranty (one year from installation or 18 months from shipment). Business Impact: Verified safety standards, lower risk of unexpected failures, and clear post-sale support. Application: Procurement, compliance audits, and long-term lifecycle planning for marine power systems.
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FAQs
For installation, ensure the unit is mounted in a compliant space with adequate ventilation and access for maintenance. The NEMA 3R enclosure supports indoor-outdoor use, so the transformer can be placed in exposed or semi-exposed areas. Clearance around the unit should accommodate wiring connections (3A750Q) and service legs, with proper protection against potential mechanical impact common in marine environments.
Confirm primary voltage availability of 240 V or 480 V and a secondary of 120/240 V, operating at 60 Hz in a single-phase configuration. The unit provides 0.75 kVA, uses copper windings, and has a fixed tap size (None). The wiring connection is 3A750Q, and the frame is 58A, giving a compact, dependable conversion suitable for standard marine panels.
Yes. The transformer is designed as marine duty and encapsulated with a NEMA 3R enclosure, plus Weathershield for indoor-outdoor use. Copper windings enhance durability, and UL Listed certification supports safety and reliability in harsh marine conditions, making it appropriate for shipboard and offshore power systems.
The QS20N11S76CU carries UL Listed certification, which confirms compliance with recognized safety standards. It is backed by Eaton’s warranty policy: one year from the date of installation or eighteen months from shipment, whichever occurs first, providing coverage for manufacturing defects and performance issues under typical marine service.
Its compact size and lightweight 27 lb weight simplify installation and space planning, reducing labor and mounting costs. The encapsulated copper-winding design improves reliability and reduces downtime, while UL certification and a solid warranty lower risk during procurement. Overall, it supports predictable maintenance costs and longer service life for marine power systems.