Eaton DD366NDKW Fused Safety Switch 600A - UL Listed
Part Number: DD366NDKW
Quick Summary
The Eaton DD366NDKW fused safety switch provides reliable, safe isolation for 3-phase power in industrial facilities. Users often struggle with rugged, code-compliant gear that fits tight electrical spaces and minimizes unplanned downtime. UL Listed certification plus enclosure ratings like NEMA 12 and NEMA 3R ensure dust and moisture protection in demanding environments. With a 600 A rating, fusible with neutral configuration, and a 600 V operating voltage, this switch supports high-load motor circuits while simplifying wiring for future expansion. The heavy-duty construction and optional window enable safer maintenance and faster status checks, delivering strong business value through improved uptime and safer, compliant power distribution.
Product Information
Extended Description
DD366NDKW Eaton: Eaton Double door single-throw fused safety switch, 600 A, NEMA 12/3R, Class H, Fusible with neutral, Three-pole, Four-wire, 600 V, Max Hp: 400, 500 hp (3PH @480/600 V), (1)#2(1)#2-(1)600, and (1)750 kcmil
Product Name
Eaton double door single-throw fused safety switch
Catalog Number
DD366NDKW
UPC
786679184752
Product Length/Depth
19.31 in
Product Height
20.25 in
Product Width
27.5 in
Product Weight
265 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
Enclosure
NEMA 12, NEMA 3R
Enclosure material
Painted galvanized steel
Fuse configuration
Fusible with neutral
Number Of Poles
Three-pole
Number of wires
4
Type
Heavy duty double door safety switch
Amperage Rating
600A
Fuse class provision
Class H
HP rating - max
400, 500 hp (3PH @480/600 V)
Voltage rating
600 V
Product Category
Dust tight
Special features
w/ window
Double Up on Safety
Double Up on Safety
Double Up on Safety
Double Up on Safety
Double Up on Safety
Eaton Specification Sheet - DD366NDKW
Feature 600 A, three-pole, fusible with neutral; Business Impact Safe, code-compliant isolation of large motor loads with simplified wiring paths for 4-wire configurations; Application Industrial motor control at 480/600 V in manufacturing lines. The DD366NDKW solves common challenges of large-duty switches by providing a robust 600 A rating that aligns with high horsepower drives (up to 400–500 hp at 3PH @480/600 V) and accommodates heavy conductor terminations while maintaining a compact enclosure footprint. Feature NEMA 12, NEMA 3R enclosure; Business Impact Protects equipment and personnel from dust, moisture, and incidental washdown; Application Powder-coat environments, outdoor or semi-exposed spaces in process plants. Feature Heavy-duty double door design; Business Impact Enhances safe access during maintenance and reduces exposure during operation; Application Refits in spaces with frequent servicing needs. Feature Enclosure material: painted galvanized steel; Business Impact Improves corrosion resistance and lifecycle cost in harsh environments; Application Food and beverage, chemical, or wastewater treatment facilities. Feature Product dimensions: 19.31 in depth, 27.5 in width, 20.25 in height; Business Impact Provides a predictable footprint for panel layouts and retrofit projects; Application Electrical rooms with limited floor space. Feature Terminations for substantial conductor sizes up to 750 kcmil; Business Impact Supports large feeder assemblies and minimizes splicing complexity; Application Heavy industry and large motor feeders. Feature W/ window; Business Impact Allows quick status checks, reducing maintenance time and improving safety; Application Routine inspections and preventive maintenance. Feature Warranty: one year from installation or eighteen months from shipment; Business Impact Lower total cost of ownership with defined service terms; Application Procurement and long-term maintenance planning.
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FAQs
The DD366NDKW is rated for 600 A, 600 V operation, configured as a three-pole, four-wire device with fusible protection and a neutral. It supports up to 400–500 hp for three-phase motors at 480/600 V, making it suitable for demanding industrial drives and large feeder circuits.
Yes. The enclosure conforms to NEMA 12 and NEMA 3R ratings, providing dust and moisture protection suitable for indoor and semi-exposed environments. This makes it well-suited for factory floors, wash-down areas, and partially protected outdoor spaces.
The unit is a three-pole, four-wire design with fusible protection and can terminate large conductor sizes, up to 750 kcmil where applicable. This capability supports high-current feeders and simplifies wiring for large motors and feeders, reducing splicing and panel clutter.
This switch carries UL Listed certification and uses a rugged galvanized steel enclosure with NEMA 12/3R protection. These ratings help ensure compliance with industry safety standards while delivering durable protection in challenging industrial environments.
The product is covered by Eaton’s warranty policy, providing one year from installation or eighteen months from shipment, whichever occurs first. This offers a clear protection window for maintenance planning and ROI considerations in asset-intensive facilities.