Eaton T57M11S25NV Transformer - Dry Type DS-3
Part Number: T57M11S25NV
Quick Summary
Transformer delivers safe, isolated power distribution for industrial controls and machine panels. In tight control rooms or equipment closets, the T57M11S25NV addresses space, maintenance, and venting concerns with a totally enclosed non-ventilated DS-3 design. Key certifications to verify with the manufacturer include CE marking for Europe, UL/CSA for North America, and IP ratings for enclosure protection. With a 25 kVA rating, 575 V primary, and 120/240 V secondary, this single-phase transformer supports scalable industrial power distribution while keeping installation straightforward, cabling neat, and operating costs predictable. By leveraging aluminum windings, frame 818N, and a 150°C rise rating, it also supports rugged performance in demanding environments.
Product Information
Extended Description
T57M11S25NV Eaton: General-Purpose Transformer, Ventilated, Dry Type Distribution, DS-3, Single-phase, PV: 575V, Taps: 2 at +2.5% FCAN, 4 at -2.5% FCBN, SV: 120/240V, 150°C, 25 kVA, Al windings, Frame: 818N
Product Name
Eaton Totally enclosed non-ventilated transformer
Catalog Number
T57M11S25NV
UPC
786685267340
Product Length/Depth
20.36 in
Product Height
37.59 in
Product Width
22.89 in
Product Weight
370 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
Contact Manufacturer
Catalog Notes
Totally enclosed non-ventilated DS-3 or DT-3
Coil material
Aluminum
Design
DS-3
Frame
818N
Tap size
2 at +2.5% FCAN, 4 at -2.5% FCBN
Type
Dry Type Distribution Transformer
Frequency rating
60 Hz
Phase
Single-phase
Primary voltage
575 V
Secondary Voltage
120/240 V
Temperature rise
150 °C rise
Feature: Totally enclosed non-ventilated DS-3 design increases reliability by protecting windings and components from dust and moisture. Business Impact: Reduces maintenance cycles and downtime in harsh plant areas. Application: Control panels and machine feeders in dusty or humid environments benefit from longer service intervals. Feature: 25 kVA power rating with 575 V primary and 120/240 V secondary delivers robust, scalable control power. Business Impact: Supports multiple control circuits from a single source, simplifying panel design and reducing spare parts. Application: Localized power for CNCs, robotics, and machine interfaces in 60 Hz environments. Feature: Tap changers (+2.5% FCAN, -2.5% FCBN) enable voltage fine-tuning on site. Business Impact: Improves voltage regulation, protecting sensitive loads and reducing nuisance tripping. Application: Site-level adjustments during commissioning or load changes. Feature: Aluminum windings with a 150°C rise rating deliver efficient heat dissipation and corrosion resistance. Business Impact: Enhances reliability in high-load pulses and reduces cooling requirements. Application: Factory floors with limited cooling capacity and elevated ambient temperatures. Feature: Frame 818N and dimensions (20.36 in L, 37.59 in H, 22.89 in W) provide a compact footprint for standard installations. Business Impact: Easier integration into existing switchgear and mounting rails, lowering installation time. Application: New builds and retrofits in space-constrained control rooms. Feature: Dry-type DS-3 enclosure with 370 lb weight supports easy handling and installation in indoor spaces. Business Impact: Safer transport and serviceability, reducing field labor costs. Application: Plant substations, panel boards, and distributed control systems in commercial and light industrial settings.
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FAQs
This transformer is designed for indoor use with a DS-3 dry-type enclosure. Consider available space, mounting pattern for frame 818N, clearance for cooling, and cable routing. Use the +2.5% and -2.5% taps to optimize input voltage during commissioning and document tap settings in the panel drawings for maintenance.
Key ratings: 25 kVA, primary 575 V, secondary 120/240 V, 60 Hz, single-phase. Tap settings are 2 taps at +2.5% FCAN and 4 taps at -2.5% FCBN, allowing voltage adjustment to match supply conditions and protect connected equipment from undervoltage or overvoltage scenarios.
Yes. Its DS-3 dry-type enclosure and totally enclosed non-ventilated design help resist dust and moisture ingress, while the 25 kVA rating supports multiple control loads. Aluminum windings and a 150°C rise rating provide robust thermal performance, enabling reliable operation in demanding environments without excessive cooling requirements.
Certifications are confirmed with the manufacturer. Common considerations include CE marking for Europe, UL/CSA for North America, and enclosure IP protection levels. Always request the latest certificate documentation to ensure alignment with local electrical codes and safety standards.
The warranty for this Eaton transformer is one year from installation or eighteen months from shipment, whichever comes first. Plan routine preventive maintenance around this window and maintain service records to maximize lifecycle value and ensure warranty coverage.