Eaton DD366FDKW Fused Safety Switch - UL Listed
Part Number: DD366FDKW
Quick Summary
Eaton double door single-throw fused safety switch provides reliable power isolation for industrial equipment in automation and heavy machinery applications. Maintenance downtime from noncompliant enclosures and complex wiring is a common pain point for plant engineers. This unit is UL Listed and features a NEMA 12, NEMA 3R enclosure with Class H fuse provisions, delivering rugged protection in harsh industrial environments. With its heavy-duty, three-pole, three-wire design and 600 V rating, it streamlines panel builds, reduces spare parts, and supports compliant electrical protection across critical distribution points. For procurement, its catalog number DD366FDKW and Eaton warranty help engineering teams source confidently and plan maintenance across multiple facilities.
Product Information
Extended Description
DD366FDKW Eaton: Eaton Double door single-throw fused safety switch, 600 A, NEMA 12/3R, 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
DD366FDKW
UPC
786679184356
Product Length/Depth
72.25 in
Product Height
16.25 in
Product Width
27.25 in
Product Weight
279 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 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
Dust tight
Special features
w/ window
Switching Devices Flex Center
Switching Devices Flex Center
Switching Devices Flex Center
Switching Devices Flex Center
Switching Devices Flex Center
Eaton Specification Sheet - DD366FDKW
Feature: Fusible without neutral, three-pole, three-wire design. Business Impact: simplifies protective device coordination and wiring complexity, accelerating panel wiring and reducing installation errors. Application: ideal for three-phase motor control and power distribution in manufacturing environments. The DD366FDKW configuration supports reliable protection in demanding lines. Feature: 600 A amperage rating and 600 V voltage rating. Business Impact: handles large motor starts and heavy loads with minimal voltage drop, enabling tighter protection coordination. Application: suitable for pumps, conveyors, and large fans in process lines. Feature: NEMA 12, NEMA 3R enclosure with painted galvanized steel. Business Impact: provides dust, moisture, and corrosion resistance for indoor and protected outdoor applications, reducing maintenance costs. Application: harsh environments such as warehouses and manufacturing floors. Feature: UL Listed certification and documented compliance. Business Impact: eases regulatory approvals and customer acceptance, shortening procurement cycles. Application: compliance-driven projects in automotive, chemical, and food & beverage industries. Feature: Three-pole, three-wire design with fuse class Class H. Business Impact: ensures proper fault isolation and fuse coordination for safe, reliable operation. Application: motor control centers and power distribution panels. Feature: Conductor sizing support up to #2, 600 kcmil, and 750 kcmil options. Business Impact: enables flexible, scalable wiring for large machines and drives, reducing rework. Application: industrial installations requiring heavy conductor capability.
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FAQs
DD366FDKW is designed for three-phase systems up to 600 V and 600 A, with a three-pole, three-wire configuration and fusible without neutral. It supports large motor loads and can be integrated into standard power distribution panels. Conductor sizing accommodates up to #2 and up to 750 kcmil, enabling straightforward upgrades without major panel redesign.
The DD366FDKW provides a 600 A amperage rating, 600 V voltage rating, and a maximum HP rating of 400–500 hp at 480/600 V. It uses Class H fuses, is three-pole, and offers fusible without neutral functionality. Enclosure is rated NEMA 12/3R, suitable for dusty, moist or outdoor-protected environments.
Yes, the device uses a NEMA 12, NEMA 3R enclosure with a painted galvanized steel cabinet, offering dust and moisture resistance. While not a dedicated outdoor NEMA 4 enclosure, the NEMA 3R rating provides reliable protection in many outdoor-protected and semi-exposed settings when installed with proper site practices.
The DD366FDKW is UL Listed, ensuring compliance with recognized safety standards for electrical equipment. This certification aids in regulatory approvals and customer acceptance, particularly in highly regulated industries such as automotive and food & beverage. Its enclosure ratings (NEMA 12/3R) further support compliance with environmental protection requirements.
Adopting the DD366FDKW can reduce downtime due to standardized protection and robust construction. The UL Listed rating, rugged NEMA 12/3R enclosure, and heavy-duty three-pole design simplify spare parts planning and maintenance routines, leading to lower total cost of ownership and faster, more predictable project execution across multiple facilities.