Eaton DH321NDK Heavy Duty Fusible Safety Switch - UL Listed
Part Number: DH321NDK
Quick Summary
DH321NDK is a heavy-duty fusible safety switch designed to protect motors and control circuits in industrial environments. This 30 A, 240 V device delivers reliable protection for demanding equipment, helping minimize downtime and equipment damage. A common challenge is integrating safe switching with minimal wiring complexity; the three-pole, four-wire configuration supports straightforward installations in new builds or retrofits. The enclosure is a painted galvanized steel NEMA 12/3R rated housing, using a Class H fuse with neutral to ensure safe startup and reliable fault isolation. Compliant with NEC 230.62 barrier requirements and UL Listed, this unit also offers field modification to meet NEMA 3R rainproof needs when a factory drain hole is opened, providing durable, adaptable protection. It pairs with standard Cu/Al conductors (#14-2 AWG) to fit a range of control scenarios.
Product Information
Extended Description
DH321NDK Eaton: Eaton Heavy duty single-throw fused safety switch, 30 A, NEMA 12/3R, Painted galvanized steel, Class H, Fusible with neutral, Three-pole, Four-wire, 240 V, Max Hp: 1.5, 3/ 3, 7.5/ 5 hp (1,3PH @Std/TD, 250 Vdc), #14-#2 Cu/Al
Product Name
Eaton heavy duty fusible safety switch
Catalog Number
DH321NDK
UPC
782113205434
Product Length/Depth
20 in
Product Height
8.5 in
Product Width
9.5 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.
Compliances
NEC 230.62 (C) Compliant Barrier
Certifications
UL Listed
Catalog Notes
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
Class H
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
1.5, 3/ 3, 7.5/ 5 hp (1,3PH @Std/TD, 250 Vdc)
NEMA rating
NEMA 12/3R
Voltage rating
240V
Product Category
Heavy Duty, Fusible with neutral
Feature → 30 A amperage rating and 240 V operation delivers targeted motor protection for small to mid-size equipment, reducing overload events and extending motor life. Business Impact → Lower maintenance costs and improved uptime in manufacturing lines; Application → Motor control circuits in conveyors, pumps, and presses benefit from precise current handling. Feature → NEMA 12, NEMA 3R painted galvanized steel enclosure offers rugged protection against dust and moisture; Business Impact → Higher reliability in harsh plant environments, lower enclosure corrosion risk, improved operator safety; Application → Dry, damp, and wet area installations in machine rooms and outdoor enclosures. Feature → Fusible with neutral and Class H fuse provide safe fault isolation and consistent opening characteristics; Business Impact → Safer energization sequences and easier transformer/motor startup control; Application → Three-pole, four-wire configurations in 240 V systems. Feature → Three-pole design with four wires simplifies wiring layouts and reduces misconnection risk; Business Impact → Faster field installs and fewer commissioning errors; Application → Panel builds and retrofit projects. Feature → UL Listed and NEC 230.62 compliant barrier support regulatory certainty; Business Impact → Simplified code compliance and safer, auditable protection; Application → Industrial controls, packaging lines, and process automation. Feature → Field modification capability to enable NEMA 3R rainproofing by opening a drain hole; Business Impact → Flexible use in outdoor or semi-exposed environments without resourcing a separate enclosure; Application → Outdoor switchgear, washdown areas, and exposed equipment setups. These insights reflect real-world need for robust, adaptable safety switching in modern industrial ecosystems.
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FAQs
Yes. The DH321NDK is a three-pole, four-wire switch rated for 240 V operation, designed to protect and control three-phase equipment while providing a neutral path via the fusible-with-neutral configuration. This setup simplifies wiring and ensures correct fault isolation in typical industrial motor circuits.
Key specs include a 30 A amperage rating, 240 V voltage rating, NEMA 12/3R enclosure, and Class H fuse with neutral. UL Listed certification confirms compliance with safety standards. The device supports motor control up to the specified HP ratings and uses #14-2 AWG Cu/Al conductors for wiring.
The catalog notes indicate field modification can meet NEMA 3R rainproof requirements by opening a factory drain hole. This provides practical rain or washdown resistance when needed, without requiring a new enclosure or a custom solution, enabling broader outdoor or exposed-area installation.
This unit is UL Listed and NEC 230.62 barrier compliant, aligning with common electrical safety and wiring code requirements. These certifications simplify acceptance by inspectors and help ensure safe, compliant operation in industrial facilities.
The DH321NDK offers durable galvanized enclosure protection, a reliable Class H fuse for predictable protection, and a robust 30 A/240 V rating for efficient control of motors. Its field-modifiable rainproof capability reduces retrofit costs, while UL listing and NEC compliance help minimize regulatory risk and maintenance downtime.