Eaton DH321NCK Heavy Duty Fusible Safety Switch - NEMA 4X
Part Number: DH321NCK
Quick Summary
The Eaton DH321NCK heavy duty fusible safety switch is designed to safely interrupt power in three-phase, 240V industrial systems. Operators and maintenance teams often battle corrosion, enclosure ingress, and unexpected downtime in harsh environments, which can undermine safety and productivity. This unit carries UL Listed certification and a NEMA 4X enclosure, with Krydon non-metallic housing that resists corrosion and washdowns. With a three-pole, four-wire design and fusible with neutral configuration, it integrates neatly into existing control panels and motor circuits. By combining rugged protection with clear fault isolation, it helps reduce maintenance costs, improve safety compliance, and accelerate project timelines for industrial facilities. This makes it a reliable choice for packaging lines, conveyors, and process equipment where uptime matters.
Product Information
Extended Description
DH321NCK Eaton: Eaton Enhanced visible blade single-throw safety switch, Corrosion resistant, 30 A, NEMA 4X, Non-metallic, KRYDON, Class H, Fusible with 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
DH321NCK
UPC
782114295946
Product Length/Depth
15.46 in
Product Height
19.25 in
Product Width
10.25 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
Enclosure
NEMA 4X
Enclosure material
Non-metallic, KRYDON
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
3, 7.5 hp (3PH @Std, TD)
NEMA rating
NEMA 4X (Non-Metallic)
Voltage rating
240V
Product Category
Heavy Duty, Fusible with neutral
Feature: Three-pole, fusible with neutral and four-wire configuration. Business Impact: Enables safe isolation of complex control circuits while preserving neutral conductors, improving fault handling and personnel safety in line-start and stop sequences. Application: Ideal for machine controls and process panels in packaging and manufacturing environments. Feature: 30A amperage rating with 240V operation and max horsepower up to 7.5 hp (3PH @Std, TD). Business Impact: Provides appropriate protection for mid-sized motors and control circuits, reducing nuisance trips and extending motor life. Application: Suitable for small to mid-size conveyors, mixers, and packaging machines. Feature: NEMA 4X enclosure with Krydon non-metallic material. Business Impact: Delivers excellent corrosion resistance and washdown durability, lowering maintenance frequency and replacement costs. Application: Outdoor or damp industrial zones and food/beverage processing areas. Feature: Fuse class provision Class H and fusible with neutral. Business Impact: Simplifies field-fuse replacement, ensures proper coordination, and enhances safety interlock in emergency shutoff scenarios. Application: Control enclosures in lines requiring reliable selective protection. Feature: Wiring compatibility #14-2 AWG Cu/Al, four wires. Business Impact: Eases field wiring and panel integration, enabling quick installation and lower labor costs. Application: Retrofit projects and new installations with standard feeder cables. Feature: UL Listed certification and 240V, 30A rating with NEMA 4X protection. Business Impact: Supports regulatory compliance and trusted performance in harsh environments, reducing risk and warranty disputes. Application: Compliance-driven projects in automotive, packaging, and process industries. Insight: In practice, these attributes translate to measurable uptime gains and predictable maintenance scheduling, especially in environments where washdown cycles and chemical exposure are routine. Engineers appreciate the balance of rugged protection, straightforward wiring, and compatibility with common control architectures.
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FAQs
The DH321NCK is a three-pole, four-wire device configured for 240V systems with a neutral. It accepts #14-2 AWG Cu/Al conductors and features a compact enclosure footprint (15.46 in L, 19.25 in H, 10.25 in W). Mounting in standard control panels or pad-mounted setups is straightforward, and the unit is UL Listed for reliable integration into existing safety schemes.
This safety switch provides a 30A amperage rating and supports up to 7.5 hp for 3-phase applications. It uses a fusible with neutral configuration, 240V operation, and a three-pole design, making it suitable for control circuits and small motors in industrial automation and packaging lines.
Yes. The enclosure is NEMA 4X rated with Krydon non-metallic material, delivering corrosion resistance and outdoor/washdown capability. This makes it well-suited for harsh environments such as food processing, chemical handling, and outdoor equipment enclosures where durability and reliability are critical.
The DH321NCK is UL Listed and features a NEMA 4X enclosure. Its fuse configuration is Class H and it employs a fusible with neutral setup, aligning with common safety and control standards for industrial panels, process lines, and machine safety interlocks.
Eaton provides a one-year warranty from installation or eighteen months from shipment, whichever occurs first. This coverage supports replacement or service for manufacturing defects and supports ongoing maintenance planning for plant operations.