Eaton DD366FWKW Fused Safety Switch - NEMA 4X
Part Number: DD366FWKW
Quick Summary
Eaton double door single-throw fused safety switch provides reliable, code-compliant power isolation for industrial control panels. In demanding environments, engineers face downtime and maintenance challenges; this unit reduces both through a rugged, long-life design and straightforward servicing. Certified UL Listed and built with a NEMA 4X, 304 stainless steel enclosure, it withstands wash-downs and harsh service. With a fusible without neutral configuration, three poles and a three-wire setup, it is rated for 600 V and up to 400–500 hp on 480/600 V systems. The combination of rugged protection and accessible lugs supports faster maintenance, safer shutdowns, and lower total cost of ownership across a lifecycle.
Product Information
Extended Description
DD366FWKW Eaton: Eaton Double door single-throw fused safety switch, 600 A, NEMA 4X, Class H, Fusible without neutral, Three-pole, Three-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
DD366FWKW
UPC
786679184714
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 without neutral
Number Of Poles
Three-pole
Number of wires
3
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
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Eaton Specification Sheet - DD366FWKW
Feature: 600 A amperage rating with a three-pole, three-wire configuration enables high-current isolation for large motor loads. Business impact: reliable fault interruption reduces arc flash risk and minimizes unplanned downtime, improving overall equipment effectiveness. Application: ideal for 600 V systems driving conveyors, pumps, and industrial presses in harsh plant environments. Feature: Fusible without neutral with Class H fuse provision simplifies protection coordination and fast fuse replacements. Business impact: lowers spare parts complexity and maintenance time while maintaining safe, code-compliant shutdowns. Application: critical feeds to heavy machinery where neutral is not required. Feature: NEMA 4X enclosure manufactured in 304 stainless steel delivers corrosion resistance and wash-down compatibility. Business impact: extends service life in damp or dusty production lines and reduces enclosure maintenance costs. Application: food and beverage processing, chemical plants, and outdoor installations. Feature: Window-enabled design (w/ window) supports quick visual status checks without opening the cabinet. Business impact: reduces downtime by enabling rapid fault verification and safer inspections. Application: production lines requiring fast line-changeovers and frequent safety verification. Feature: UL Listed certification and a comprehensive Eaton warranty provide regulatory confidence and long-term reliability. Business impact: helps with compliance audits, supplier qualification, and predictable total cost of ownership. Application: industrial facilities with stringent procurement requirements and uptime targets. Feature: Conductor capacity supports up to 750 kcmil conductors in the line-side lugs and smaller sizes for flexible wiring. Business impact: enables versatile wiring schemes and future expansion without replacing switchgear. Application: large-capacity motor feeders and feeder circuits in switchgear assemblies.
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FAQs
DD366FWKW is a three-pole, three-wire fused switch rated for 600 V and 600 A, with fusible without neutral configuration. When installing in new or retrofit panels, verify door clearance, lug sizes, and available space. Ensure the correct Class H fuse is used and that the enclosure remains accessibly for maintenance. The NEMA 4X, 304 stainless steel body supports wash-down environments, aligning with common MCC and panel architectures.
Key specs include 600 A amperage rating, 600 V voltage rating, three-pole, three-wire configuration, fusible without neutral, Class H fuse provision, and HP rating up to 400–500 hp at 480/600 V. Enclosure is UL Listed and NEMA 4X, constructed in 304 stainless steel. It supports conductors up to large sizes, with three-wire control and safe, code-compliant isolation for motor drives and heavy loads.
Yes. The DD366FWKW uses a NEMA 4X rated enclosure in 304 stainless steel, designed for wash-down, dust, and corrosion resistance. This makes it well-suited for food and beverage processing, chemical plants, outdoor installations, and other harsh environments where enclosure integrity and reliability are critical to uptime.
The unit is UL Listed, reflecting compliance with recognized safety standards. It carries Eaton’s warranty policy, typically one year from installation or eighteen months from shipment, whichever occurs first. These certifications and terms support regulatory audits, procurement approvals, and predictable maintenance planning for critical facilities.
The switch is designed for flexible wiring with large feeder capabilities, supporting conductor sizes appropriate for high-current applications and lugs suitable for up to 750 kcmil conductors, as well as smaller sizes such as #2 conductors. This enables scalable motor feeder configurations and future expansion without replacing switchgear.