Eaton DD321FDKW Heavy Duty Fusible Safety Switch - UL Listed
Part Number: DD321FDKW
Quick Summary
Eaton heavy duty fusible safety switches provide reliable isolation for 30 A, 240 V motor circuits in demanding industrial environments. A common challenge is ensuring safe maintenance while minimizing downtime and unplanned outages. This model is UL Listed and features a NEMA 12/3R enclosure for dust-tight protection, with Class H fuse provision for reliable protection. From a business perspective, it reduces risk, improves uptime, and aligns with safety standards for motor-control and power-distribution applications.
Product Information
Extended Description
DD321FDKW Eaton: Eaton Heavy duty single-throw fused safety switch, 30 A, NEMA 12/3R, Fusible without neutral, Three-pole, Three-wire, 240 V, Max Hp: 7.5, 10/ 15, 20 hp (1/3PH @480, 600 V), #14-#2
Product Name
Eaton heavy duty fusible safety switch
Catalog Number
DD321FDKW
UPC
786679177150
Product Length/Depth
37.49 in
Product Height
8.22 in
Product Width
12.33 in
Product Weight
37 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
Double Door Isolation Switch
Enclosure
NEMA 12, NEMA 3R
Enclosure material
Painted galvanized steel
Fuse class provision
Class H
Fuse configuration
Fusible without neutral
Number Of Poles
Three-pole
Number of wires
3
Type
Heavy duty double door safety switch
Wire size
#14-2 AWG
Amperage Rating
30A
HP rating - max
7.5, 10/ 15, 20 hp (1/3PH @480, 600 V)
NEMA rating
NEMA 12/3R
Voltage rating
240V
Product Category
Dust tight
Eaton Specification Sheet - DD321FDKW
Selling Policy 25-000 - Distribution and Control Products and Services
Three-pole, fusible switch design delivers controlled, reliable overcurrent protection for 30 A circuits with fusible without neutral configuration. Business impact: minimizes arc-flash exposure and protects downstream equipment, lowering maintenance costs and unplanned downtime. Application: motor feeders and machine-control lines in manufacturing settings requiring rugged, field-serviceable protection. The NEMA 12/3R enclosure with painted galvanized steel construction provides dust-tight and moisture-resilient protection. Business impact: extended equipment life and reduced environmental ingress in harsh plant environments. Application: panel-mounted safety switches at dusty production floors and wet areas where enclosure integrity matters. Fuse class provision uses Class H fuses for selective coordination and fast fault clearing. Business impact: improved protection against nuisance trips and energy waste. Application: feeders and control circuits with strict protection requirements. Wire size compatibility with #14-2 AWG simplifies field wiring and termination. Business impact: faster installation and fewer wiring errors. Application: standard control-system wiring for industrial machines. The double-door isolation switch design enhances serviceability and safety during maintenance. Business impact: safer handoffs and quicker turnout when servicing equipment. Application: routine inspection, fuse replacement, and panel downtime planning. Dimensions and weight support site planning with a 37.49 in depth, 12.33 in width, 8.22 in height footprint and a 37 lb weight. Business impact: easier integration into existing switchgear layouts and less on-site material handling.
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FAQs
The DD321FDKW is designed for wall or panel mounting in industrial environments. Plan for a 37.49 in depth and 12.33 in width space, allow clearances for service access, and route wiring using #14-2 AWG conductors to a three-pole terminal block. Ensure correct fuse configuration (Class H) and verify 240 V operation for safe, compliant isolation during maintenance.
The DD321FDKW is ideal for motor control and safety isolation in manufacturing, packaging, and processing facilities where 240 V three-wire circuits operate up to 30 A. It supports three-pole switching with fusible protection, without neutral, and it suits feeder lines and machine-control panels requiring rugged, space-efficient isolation.
The unit carries UL Listed certification and uses a NEMA 12/3R enclosure for dust-tight protection. It includes a Class H fuse provision and is designed as a double-door isolation switch to support safe maintenance and regulatory compliance in industrial environments.
With a durable galvanized steel enclosure and a 37 lb weight, the DD321FDKW minimizes downtime during servicing. Fuse replacements follow Class H protection, reducing nuisance trips. The UL Listed status and rugged construction help lower life-cycle costs by extending service intervals and improving system reliability.
Connect using #14-2 AWG conductors in a three-wire, three-pole configuration rated for 240 V. Follow manufacturer torque specs for fuse holders and lugs, respect enclosure clearances, and maintain proper separation from energized components. The device is designed for straightforward field wiring and is compatible with standard control-system architectures.