Eaton DH321FRKJ Auxiliary Power Switch - UL Listed
Part Number: DH321FRKJ
Quick Summary
The Eaton DH321FRKJ auxiliary power switch is a reliable three‑pole control device designed for 240 V industrial applications. It helps prevent unintentional startup and protects critical equipment in demanding environments. UL Listed certification and a NEMA 3R enclosure rating provide essential safety and outdoor reliability, while the unit’s fusible Class J design supports safe interruption without neutral. This combination reduces downtime and simplifies wiring in service entrances. For engineers, the value lies in robust protection paired with straightforward installation, enabling predictable performance in motor control circuits, conveyors, and processing lines. Secondary benefits include easy neutral-kit integration and compatibility with standard control panels for faster project completion and lower lifecycle costs.
Product Information
Extended Description
DH321FRKJ Eaton: Eaton auxiliary power switch, 30 A, NEMA 3R, Painted galvanized steel, Class J, Fusible without neutral, Three-pole, Three-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 auxiliary power switch
Catalog Number
DH321FRKJ
UPC
782113362991
Product Length/Depth
16.5 in
Product Height
8.31 in
Product Width
9.12 in
Product Weight
20 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
Suitable for service entrance use with a Neutral Kit installed
Amperage Rating
30A
HP rating - max
1.5, 3/ 3, 7.5/ 5 hp (1,3PH @Std/TD, 250 Vdc)
Voltage rating
240V
Enclosure
NEMA 3R
Enclosure material
Painted galvanized steel
Fuse class provision
Class J
Fuse configuration
Fusible without neutral
Number Of Poles
Three-pole
Number of wires
3
Type
Heavy duty fusible safety switch
Wire size
#14-2 AWG Cu/Al
Product Category
Heavy Duty, Fusible without neutral
Feature: 30 A amperage rating with three‑pole, three‑wire configuration. Business Impact: Delivers solid overload protection for motor loads up to 1.5 to 7.5 hp at 240 V, reducing nuisance trips and protecting drives. Application: Ideal for compact motor feeders and equipment where reliable switching is required in harsh environments. Feature: NEMA 3R enclosure built from painted galvanized steel. Business Impact: Offers weather resistance and corrosion protection, extending service life in outdoor or damp locations. Application: Suitable for service entrances and outdoor control panels. Feature: Class J fuse provision with fusible without neutral configuration. Business Impact: Enables selective coordination and safe interruption without introducing neutral conductors, simplifying wiring at panel boards. Application: Common in industrial control circuits and line-side protection. Feature: UL Listed with Neutral Kit compatibility notes. Business Impact: Ensures regulatory compliance and ease of service entrance installation when required. Application: Facilitates inspections and reduces commissioning time in industrial facilities. Feature: Compact footprint with defined dimensions and weight. Business Impact: Fits standard control enclosures and control cabinets, streamlining retrofits and new installations. Application: Widely used in machine rooms, packaging lines, and process automation. Feature: HP ratings up to 7.5/5 hp (1,3PH @Std/TD, 250 Vdc). Business Impact: Supports varied motor loads and drive configurations, enabling scalable protection. Application: Suitable for mixed motor loads in manufacturing lines and material handling systems.
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FAQs
The DH321FRKJ is designed for service entrances with a Neutral Kit installed. Plan for a three‑pole, three‑wire configuration at 240 V, using copper or aluminum conductors in sizes #14 through #2. Its NEMA 3R enclosure supports outdoor or damp locations, and the unit weighs about 20 lb with dimensions of 16.5 in length, 9.12 in width, and 8.31 in height. Ensure UL Listed compliance and proper panel fitment during retrofit or new installations.
The DH321FRKJ carries UL Listed certification, a hallmark of recognized safety compliance. It uses a Class J fuse configuration with fusible without neutral, supporting safe interruption of motor loads. The NEMA 3R enclosure offers environmental protection for indoor or outdoor use. Its three‑pole design and 240 V rating align with standard industrial protection practices, aiding inspections and maintenance planning.
Yes. Catalog notes indicate suitability for service entrance use with a Neutral Kit installed, and the design supports integration with typical service equipment in industrial settings. This compatibility simplifies system upgrades by allowing a straightforward upgrade path for service-disconnect protection without extensive rewiring, ensuring consistent protection across new and retrofitted panels.
This heavy duty fusible safety switch is well-suited for three‑phase motor control, conveyors, and packaging lines where reliable protection and quick disconnects are needed. With 30 A ratings and HP compatibility up to 7.5/5 hp (1,3PH @Std/TD, 250 Vdc), it provides scalable protection for varied loads, while the NEMA 3R enclosure supports outdoor or damp environments common in manufacturing floors.
The DH321FRKJ delivers predictable reliability through UL safety compliance and robust construction in painted galvanized steel. The fusible without neutral configuration reduces wiring complexity, lowering commissioning time. Regular checks on fuse integrity and enclosure sealing help sustain performance, while the 1‑year (or 18 months from shipment) Eaton warranty supports ongoing performance assurance in demanding industrial environments.