Eaton DH321NDKW Heavy Duty Fusible Safety Switch - UL Listed
Part Number: DH321NDKW
Quick Summary
DH321NDKW heavy duty fusible safety switch is Eaton's solution for reliable control of three-phase motor circuits in industrial panels. Maintenance downtime and field wiring errors can jeopardize safety and uptime. UL Listed certification and a rugged NEMA 12/3R enclosure protect against electrical faults and environmental exposure in dusty, damp, or washdown environments. The painted galvanized steel housing delivers long life in harsh facilities, and cartridge fuse provisions simplify inspection and replacement. Field modification options to meet NEMA 3R rainproof requirements when a drain hole is opened provide installation flexibility for outdoor applications, helping protect equipment and reduce total cost of ownership. This makes it ideal for electrical protection and circuit control in demanding environments.
Product Information
Extended Description
DH321NDKW Eaton: Eaton Enhanced visible blade single-throw safety switch, Enhanced visible blade, upper viewing window, 30 A, NEMA 12/3R, Painted galvanized steel, Cartridge, 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
DH321NDKW
UPC
782114022573
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. Can be field modified to meetNEMA 3R rainproof requirements when a factory provided drain hole is opened.
Enclosure
NEMA 12, NEMA 3R
Enclosure material
Painted galvanized 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 12/3R
Voltage rating
240V
Product Category
Heavy Duty, Fusible with neutral
Three-pole design with cartridge fuse provision delivers safe and predictable disconnection of three-phase circuits, reducing arc exposure during maintenance and improving overall panel reliability. Business impact: safer work practices, faster fault isolation, and compliant protection for motors up to 7.5 hp. Application: motor control panels and MCCs in manufacturing and processing lines. 30A, 240V operation supports common mid-size motor loads, enabling efficient electrical protection without over-engineering the switchgear. HP rating max of 3, with 7.5 hp noted for three-phase service, provides flexibility for light-to-moderate industrial drives. NEMA 12/3R enclosure and painted galvanized steel enclosure material resist dust, moisture, and corrosion, extending service life in tough environments. Upper viewing window and enhanced visible blade allow quick status checks without door opening, reducing downtime and improving maintenance workflows. Field-modifiable rainproof capability for NEMA 3R outdoor installs is available when a drain hole is opened, offering installation versatility for outdoor or washdown areas. Wire size is #14-2 AWG Cu/Al across four conductors, simplifying panel wiring. UL Listed certification supports compliance, and a one-year to eighteen-month warranty reinforces risk management and total cost of ownership considerations.
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FAQs
The DH321NDKW is designed for three-phase, 240V systems with four conductors in a four-wire configuration. Its three-pole, cartridge-fuse switch isolates the motor circuit quickly while maintaining a neutral path for balanced operation. It supports up to 30A and up to 7.5 hp (3PH @Std, TD), aligning with common motor control panels and MCCs in manufacturing environments.
The NEMA 12/3R enclosure offers dust, dirt, and moisture protection, suitable for harsh indoor environments and certain outdoor setups when properly installed. Painted galvanized steel adds durability, while the enclosure design enables safe servicing with a viewing window for status checks, reducing door openings and exposure during maintenance.
Yes. The unit can be field modified to meet NEMA 3R rainproof requirements when a factory provided drain hole is opened. This enables outdoor installations or washdown environments while maintaining safety and UL compliance, provided manufacturer instructions are followed to preserve enclosure integrity and performance.
This model carries UL Listed certification for safety and performance in industrial settings. Warranty terms follow Eaton's policy 25-000, typically one year from installation or eighteen months from shipment, whichever occurs first. This combination supports regulatory compliance and predictable maintenance budgeting for mission-critical motor protections.
The cartridge fuse arrangement simplifies replacement and reduces downtime during maintenance. A rugged painted steel enclosure and UL listing contribute to longer service intervals and lower total cost of ownership in demanding facilities. Quick status checks via the viewing window, plus compatibility with common 30A, 240V motor loads, translate to safer, more reliable operation and reduced maintenance costs over time.