Eaton DH423FDK Heavy Duty Fusible Safety Switch - UL Listed
Part Number: DH423FDK
Quick Summary
Eaton heavy duty fusible safety switch protects electrical systems by interrupting power in process lines and industrial equipment. Maintenance teams often struggle with unplanned downtime due to undersized protection, nuisance trips, or difficult field modifications. It is UL Listed and available in a NEMA 12/3R enclosure, with field-modifiable NEMA 3R rainproof capability when a drain hole is opened. This combination supports higher reliability for motor control centers and heavy machinery, improving uptime and safety. The rugged construction and straightforward installability also help streamline panel integration, spare parts planning, and commissioning schedules for industrial facilities.
Product Information
Extended Description
DH423FDK Eaton: Eaton Enhanced visible blade single-throw safety switch, 100 A, NEMA 12/3R, Class H, Four-pole, Four-wire, 240 V, Max Hp: 15, 15/ 30, 30/ 20 hp (1,3PH @Std/TD/250 Vdc), 600 V, #14-#1/0 Cu/Al
Product Name
Eaton heavy duty fusible safety switch
Catalog Number
DH423FDK
UPC
782113206356
Product Length/Depth
10.22 in
Product Height
24.95 in
Product Width
15.1 in
Product Weight
45 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
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 without neutral
Number Of Poles
Four-pole
Number of wires
4
Type
Heavy duty fusible safety switch
Amperage Rating
100A
HP rating - max
15, 15/ 30, 30/ 20 hp (1,3PH @Std/TD/250 Vdc)
NEMA rating
NEMA 12/3R
Voltage - max
600 V
Voltage rating
240V
Product Category
Heavy Duty, Fusible without neutral
100 A capacity with a four-pole design provides coordinated protection across all phase conductors, reducing the risk of multi-phase faults and enabling consistent trip behavior. Business impact includes lower downtime and safer starts for conveyors, pumps, and motors in MCCs and process lines, while installation in standard control panels remains straightforward. NEMA 12/3R enclosure with painted galvanized steel delivers durable protection against dust, moisture, and incidental impacts, extending service life in harsh manufacturing environments and lowering maintenance costs. For outdoor or damp locations, the field-modifiable option to meet NEMA 3R rainproof requirements adds versatility without replacing the switch. The Class H fuse provision and fusible-without-neutral configuration simplify wiring and preserve protection selectivity for typical 1–3 phase loads, speeding up commissioning and reducing wiring errors. HP ratings of 15, 15/30, and 30/20 HP (1,3PH @Std/TD/250 Vdc) alongside a 240 V rating and 600 V max enable broad compatibility with common motors and drives, avoiding over-protection and supporting efficient operation. In practice, this design supports quick retrofits into existing panels, standardizes spare parts, and aids in meeting plant-wide safety and reliability targets.
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FAQs
The DH423FDK uses a four-pole, four-wire configuration rated 100A and 240V (600V max) with a NEMA 12/3R enclosure, weighing about 45 lb. It supports field modification to NEMA 3R for rainproof outdoor or damp locations by enabling a drain modification. Plan for a compact footprint (10.22 in depth, 24.95 in height, 15.1 in width) and ensure panel space accommodates the enclosure and wiring clearances.
Consider 100 A amperage rating with four poles and four wires, 240 V operating voltage (with a 600 V max), and the HP ratings of 15, 15/30, 30/20 for 1,3PH applications. The fuse class is Class H and the configuration is fusible without neutral, which simplifies wiring for standard motors and drives typical in MCCs and process lines.
Indoors it comes in a NEMA 12 enclosure, but it is field-modifiable to meet NEMA 3R rainproof requirements by opening a drain hole as noted in catalog guidance. This creates outdoor or damp-location capability without replacing the switch, enabling continued protection for motors and feeders in harsher conditions.
The DH423FDK is UL Listed, ensuring compliance with recognized safety standards for electrical protection devices. Its NEMA 12/3R enclosure rating supports reliability in harsh environments. The option to field modify for NEMA 3R rainproof duty adds flexibility for projects requiring outdoor installation, which helps maintain compliance while simplifying installation in variable facilities.
Eaton provides a warranty of one year from installation or eighteen months from shipment, whichever occurs first, under policy 25-000. For maintenance, spare-parts availability, and commissioning support, contact Eaton technical support or your authorized distributor to ensure timely parts and guidance during retrofits or new installations.