Eaton DD366NWKW fused safety switch - UL Listed
Part Number: DD366NWKW
Quick Summary
The Eaton DD366NWKW fused safety switch provides reliable disconnect protection for heavy-duty motor circuits in industrial plants. Operators often confront space constraints and corrosive environments, where weak enclosures lead to unsafe isolation and costly downtime. UL Listed protection and a NEMA 4X, 304 stainless steel enclosure with fusible neutral protection help meet harsh-duty requirements. This combination supports safer installations, longer service life, and lower total cost of ownership in electrical protection and control systems. Engineering teams value the 600 A current rating, three-pole, four-wire configuration, and a 600 V maximum voltage for scalable plant layouts. The included window feature simplifies status checks during commissioning and routine maintenance, reducing downtime and accelerating changeouts.
Product Information
Extended Description
DD366NWKW Eaton: Eaton Double door single-throw fused safety switch, 600 A, NEMA 4X, 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
DD366NWKW
UPC
786679184790
Product Length/Depth
19.31 in
Product Height
25.32 in
Product Width
77.96 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 4X
Enclosure material
304 stainless 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
Watertight
Special features
w/ window
ARMS Enclosed Circuit Breaker
ARMS Enclosed Circuit Breaker
ARMS Enclosed Circuit Breaker
ARMS Enclosed Circuit Breaker
ARMS Enclosed Circuit Breaker
Eaton Specification Sheet - DD366NWKW
Feature: 600 A amperage rating with a 600 V maximum rating, delivered through a three-pole, four-wire configuration with fusible links and neutral. Business Impact: Enables safe handling of large motor starts and heavy loads while delivering predictable protection, reducing nuisance trips and extending equipment life. Application: Ideal for motor control centers and process lines in manufacturing, packaging, and material handling where reliable disconnects are critical. Feature: NEMA 4X enclosure in 304 stainless steel. Business Impact: Provides superior corrosion resistance and ingress protection for washdown areas, humid environments, and outdoor installations, lowering maintenance frequency and costs. Application: Water treatment, mining, chemical processing, and food/beverage facilities that demand rugged protection. Feature: Fusible with neutral; Class H fuse provision. Business Impact: Supports selective coordination and safe fault isolation, protecting personnel while limiting fault propagation and simplifying fuse replacement. Application: Large, multi-motor systems and lines requiring neutral protection at 600 V. Feature: Windowed enclosure for visual status. Business Impact: Speeds commissioning and routine inspections, enabling quick assessments without compromising enclosure integrity. Application: Production floors and service bays where at-a-glance status improves maintenance efficiency. Feature: UL Listed certification and rugged build. Business Impact: Ensures compliance with safety standards and supports warranty coverage, reducing procurement risk in regulated industries. Application: Procurement and installation in regulated environments such as manufacturing, water/wastewater, and energy services.
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FAQs
The DD366NWKW is designed as a three-pole, four-wire fusible safety switch with neutral, rated for 600 A and up to 600 V. This configuration supports large motor loads and provides predictable protection coordination. When deploying, follow the manufacturer’s conductor sizing guidelines and ensure proper neutral grounding per site standards to maintain optimal performance and safety.
Yes. The DD366NWKW uses a NEMA 4X enclosure crafted from 304 stainless steel, delivering excellent corrosion resistance and watertight protection. This makes it suitable for washdown areas, high-humidity facilities, outdoor installations, and other demanding environments where enclosure integrity is critical for personnel safety and equipment reliability.
The unit supports up to 400 to 500 HP for three-phase systems at 480/600 V, enabling safe isolation of high‑power motors. When selecting this switch, verify motor full-load current and impedance to ensure the device provides appropriate protection while maintaining startup performance and drive protection coordination.
The DD366NWKW is UL Listed, affirming compliance with essential safety standards. Eaton’s warranty policy 25-000 provides one year from installation or eighteen months from shipment, whichever occurs first. For regulated industries, this combination helps support audit trails and service commitments while reducing long-term risk and downtime.
This switch is commonly installed in motor control centers, process lines, water treatment and mining facilities, and packaging operations where rugged protection and reliable isolation are required. The built‑in window facilitates quick status checks during commissioning and maintenance, while the 600 A/600 V rating supports demanding motor loads in challenging industrial environments.