Eaton DD325NDKW Safety Switch - 400A NEMA 12/3R
Part Number: DD325NDKW
Quick Summary
The Eaton double door single-throw fused safety switch provides reliable isolation for heavy industrial equipment. Facilities often struggle with unsafe lockout practices, arc-flash exposure, and space constraints that slow startups and maintenance. UL Listed certification and rugged NEMA 12/3R enclosure protect workers and assets, while Class H fuse protection ensures coordinated clearance for demanding motor loads. Designed for 240 V control schemes and four-wire power, it supports scalable protection and minimizes downtime, making it a strong asset in electrical protection and circuit control. Engineers appreciate integrated documentation, including the Eaton specification sheet, to accelerate procurement, QA reviews, and on-site installation planning.
Product Information
Extended Description
DD325NDKW Eaton: Eaton Double door single-throw fused safety switch, 400 A, NEMA 12/3R, Fusible with neutral, Three-pole, Four-wire, 240 V, Max Hp: 250, 350 hp (3PH @480/600 V), (2)#1/0(1)#1/0-(2)300 kcmil-#1/0, or (1)175 kcmil-#1/0
Product Name
Eaton double door single-throw fused safety switch
Catalog Number
DD325NDKW
UPC
786679184165
Product Length/Depth
16.41 in
Product Height
24.32 in
Product Width
72.46 in
Product Weight
219 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
400A
Fuse class provision
Class H
HP rating - max
250, 350 hp (3PH @480/600 V)
Voltage rating
240V
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 - DD325NDKW
Fusible with neutral: The fuse configuration provides selective coordination and fault isolation, reducing nuisance trips and protecting downstream circuits. In practice, Class H fuses coordinate with upstream protection to deliver predictable clearing times, improving motor protection for pumps, conveyors, and other critical loads in demanding facilities. This translates to fewer unplanned outages and lower maintenance costs over the asset lifecycle. Three-pole, four-wire, 400A rating: This arrangement delivers robust power isolation for three-phase motors up to 350 hp at 480/600 V, supporting high-inertia loads while reducing switchgear wear. The result is longer drive life, smoother startups, and lower total cost of ownership in heavy manufacturing environments.
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FAQs
Installers should plan for a three-phase, four-wire supply with a neutral, ensure mounting on a sturdy, level surface, and permit sufficient clearance for fan and door access. Verify enclosure ratings (NEMA 12, NEMA 3R) to confirm indoor or outdoor suitability, and consult the Eaton spec sheet for wiring diagrams and torque values to reduce commissioning time.
Class H fuses provide precise current-limiting and fast clearing for overloads, preventing damage to downstream starters and conductors. This targeted coordination reduces nuisance trips and arc-flash exposure during faults, improving reliability for pumps and conveyors and supporting safe, compliant motor control in rugged industrial environments.
Yes. The switch is rated for 240 V control circuitry and 400 A main current, with HP ratings specified for 480/600 V, up to 350 hp. For 240 V control systems, use compatible contactors and wiring compatible with the fusible neutral arrangement to ensure correct protection and sequencing.
This unit is UL Listed and housed in a rugged NEMA 12, NEMA 3R enclosure. The combination supports dust-tight indoor use and weather-resistant outdoor service, meeting essential electrical safety and environmental protection requirements for industrial facilities.
Maintenance benefits come from reduced nuisance trips, longer motor life, and predictable fault clearance due to Class H fuses. The UL Listed rating supports regulatory compliance, while the robust enclosure minimizes environmental wear. Over time, these factors contribute to lower downtime, safer startups, and a favorable return on investment in power distribution systems.