Eaton DD366FDKW-00LO Double Door Safety Switch - UL Listed
Part Number: DD366FDKW-00LO
Quick Summary
Eaton double door single-throw fused safety switch isolates equipment safely in industrial panels. This design addresses downtime and mis-wiring concerns by delivering reliable line isolation with a robust enclosure. UL Listed certification supports compliance, while the NEMA 12/3R enclosure and Class H fuse design provide dust-tight protection in harsh environments. Built for heavy-duty control, it pairs with 600 V systems, three-pole operation, and three-wire configurations, delivering predictable maintenance and reduced total cost of ownership for mid-to-large scale electrical installations.
Product Information
Extended Description
DD366FDKW-00LO Eaton: Eaton Double door single-throw fused safety switch, 600 A, NEMA 12/3R, Painted galvanized steel, Class H, Fusible without neutral, 3P, Three-wire, 600 V, Max Hp: 400, 500 hp (3PH @480, 600 V).
Product Name
Eaton double door single-throw fused safety switch
Catalog Number
DD366FDKW-00LO
UPC
786689211882
Product Length/Depth
72.25 in
Product Height
16.25 in
Product Width
25.32 in
Product Weight
265 lb
Certifications
UL Listed
Catalog Notes
Double Door Isolation Switch
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)
NEMA rating
NEMA 12
Voltage rating
600 V
Product Category
Dust tight
Special features
w/ window, Lock-On Provision
Double Door Line Isolation Safety Switch
Double Door Line Isolation Safety Switch
Double Door Line Isolation Safety Switch
Double Door Line Isolation Safety Switch
Double Door Line Isolation Safety Switch
Eaton Specification Sheet - DD366FDKW-00LO
Feature → Business Impact → Application: The 600A amperage rating enables direct control of large motors and feeders, reducing the need for extra devices and simplifying panel layout, which translates to lower wiring costs and faster commissioning on manufacturing lines. This unit is a three-pole, three-wire design ideal for three-phase motors operating at 480–600 V, improving fault clearance coordination and safeguarding personnel. Feature → Business Impact → Application: NEMA 12 and NEMA 3R enclosure ratings provide dust-tight and splash-protected protection, expanding installation options from indoor panels to outdoor environments without additional housings. Feature → Business Impact → Application: Fusible without neutral fuse configuration delivers selective protection and simplifies wiring when neutral is not required, reducing nuisance trips and improving overall system reliability in power distribution cabinets. Feature → Business Impact → Application: W/ window and Lock-On Provision, maintenance teams can verify status quickly and secure the switch during service, lowering downtime and improving safety during maintenance windows in assembly lines. Feature → Business Impact → Application: UL Listed certification underpins compliance with safety standards, while compatibility with 3P, 600 V systems supports rapid integration across legacy and new equipment, reducing engineering effort and project risk. Feature → Business Impact → Application: Heavy-duty design and documented HP ratings (400–500 hp) provide confidence when protecting connected loads like pumps, conveyors, and presses, enabling accurate sizing and avoiding over- or under-protection in critical processes.
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FAQs
This safety switch is designed for three-pole, three-wire connections at up to 600 V and 600 A. It fits NEMA 12, NEMA 3R enclosures with a footprint compatible with standard line-isolation installations. Plan for adequate clearance, mounting supports, and access to the window and Lock-On provisions for safe operation and service, ensuring compliance with local electrical codes.
Yes. The device supports 600 V, three-phase power and offers maximum HP ratings of 400–500 hp (3PH @480, 600 V). The three-pole, fusible-without-neutral configuration is intended to protect large motor feeders and feeders in process lines, aligning with typical industrial drive applications.
The model is UL Listed, indicating compliance with recognized electrical safety standards. While UL Listed is the primary certification present, verify your site’s requirements for CE or IP ratings if needed for specific regional approvals, and consult the Eaton datasheet for installation guidance and compliance alignment with your local regulations.
The built-in window and Lock-On Provision enable quick visual status checks and secure operation during maintenance, reducing service time. Its robust NEMA 12/3R enclosure resists dust and splash, allowing outdoor or harsh indoor environments without additional housing, which minimizes spare-part needs and accelerates routine servicing.
With 600 A amperage, 600 V rating, and three wires across three poles, it simplifies motor control and feeder wiring in power distribution panels. The fusible without neutral configuration removes unnecessary conductors, while UL Listing and enclosure ratings support straightforward procurement, installation, and compliance across new builds and retrofits.