Eaton DH321NWKW Heavy Duty Fusible Safety Switch - UL Listed
Part Number: DH321NWKW
Quick Summary
The Eaton DH321NWKW heavy-duty fusible safety switch protects industrial power circuits while enabling safe isolation for maintenance. This design addresses downtime caused by corrosion, wear, and exposed switchgear by delivering reliable enclosure integrity and straightforward serviceability. UL Listed, the NEMA 4X stainless steel enclosure and 304-grade material provide dependable corrosion resistance in demanding environments, including outdoor and washdown applications. With a three-pole, four-wire configuration and a 240 V rating, it integrates smoothly into 3-phase systems, enhancing protection without adding complexity. For engineers and procurement teams, the combination of robust protection, predictable performance, and long-term value supports safer operations and lower total cost of ownership.
Product Information
Extended Description
DH321NWKW Eaton: Eaton Enhanced visible blade single-throw safety switch, Corrosion resistant, enhanced visible blade, 30 A, NEMA 4X, 304 stainless steel, Cartridge, Neutral, Three-pole, Four-wire, 240 V, Max Hp: 3, 7.5 hp (3PH @Std, TD), #14-#2 Cu/Al
Product Name
Eaton heavy duty fusible safety switch
Catalog Number
DH321NWKW
UPC
782114022566
Product Length/Depth
23 in
Product Height
10.5 in
Product Width
12.5 in
Product Weight
22 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
Catalog Notes
For 2-pole applications; use outside poles of 3-pole switch
Enclosure
NEMA 4X
Enclosure material
304 stainless steel
Fuse class provision
Cartridge
Fuse configuration
Fusible with neutral
Number Of Poles
Three-pole
Number of wires
4
Type
Heavy duty fusible safety switch
Wire size
#14-2 AWG Cu/Al
Amperage Rating
30A
HP rating - max
3, 7.5 hp (3PH @Std, TD)
NEMA rating
NEMA 4X (Stainless)
Voltage rating
240V
Product Category
Heavy Duty, Fusible with neutral
Feature → Business Impact → Application. Corrosion-resistant enclosure and 304 stainless steel construction deliver superior durability in harsh environments, reducing maintenance cycles and downtime in outdoor facilities and washdowns. This translates to lower total cost of ownership while maintaining safety. The cartridge fuse provision provides reliable overcurrent protection with simple field replacement, improving mean time to repair (MTTR) and keeping critical lines in service. In three-pole, four-wire configurations, the switch supports clean, scalable integration with neutral, enabling straightforward motor control protection for pumps, conveyors, and fans in manufacturing lines. The NEMA 4X rated enclosure ensures splash and corrosion resistance, expanding installation options from indoor panels to outdoor switchgear cabinets. With UL Listing and standardized form factors, installation aligns with compliance programs and reduces engineering risk.
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FAQs
The DH321NWKW is a three-pole, four-wire safety switch designed for 240V systems. Wire it with #14-2 AWG Cu/Al conductors, using the neutral as specified for fusible with neutral configurations. It supports 3P applications and has provisions for use on the outside poles of a 3-pole switch for 2-pole configurations. The NEMA 4X enclosure simplifies outdoor or washdown installations, and UL listing confirms compliance with relevant standards. Ensure proper mounting in a clean, dry environment and verify conductor sizing against the 30A rating.
Key ratings include a 30A amperage rating, 240V voltage rating, and a maximum horsepower of 3 or 7.5 hp for 3-phase configurations. It is a heavy-duty fusible safety switch with a cartridge fuse provision and a neutral connection, designed for 3-pole operation with four wires. The device is UL Listed and built into a NEMA 4X enclosure with 304 stainless steel to withstand corrosive environments, making it suitable for demanding industrial applications.
Yes. The DH321NWKW uses a 304 stainless steel enclosure and a NEMA 4X rating, providing excellent corrosion resistance in outdoor and washdown conditions. This makes it well-suited for environments where moisture, chemicals, or salt exposure are concerns, while maintaining safe isolation and reliable overcurrent protection for three-phase circuits.
This switch is UL Listed, ensuring compliance with essential safety standards. The NEMA 4X enclosure and 304 stainless steel construction reinforce its suitability for challenging environments, including outdoor installations. For procurement and compliance teams, these certifications support safer operation, simpler auditing, and alignment with industrial protection guidelines in electrical switchgear and motor control applications.
The product is covered under Eaton's warranty policy 25-000, offering one year from installation or eighteen months from shipment, whichever occurs first. Routine maintenance should focus on inspecting enclosure integrity, verifying fuse condition, and ensuring clean, dry mounting conditions. If a fuse or internal component requires replacement, field service should be performed by qualified personnel to maintain UL compliance and safe operation.