Eaton DH666FDK Heavy Duty Fusible Safety Switch - NEMA 12
Part Number: DH666FDK
Quick Summary
Eaton DH666FDK heavy duty fusible safety switch protects motor circuits in industrial equipment. Routinely, unplanned outages and difficult fault isolation drain productivity and escalate maintenance costs. It features a NEMA 12 enclosure for harsh environments, Class H fuses for dependable protection, and a six-pole, six-wire configuration suited to TD 3-Ph systems. This solution integrates with standard motor protection schemes and supports efficient panel design, enabling quick isolation during maintenance and scalable installations across 3-phase motors. By delivering a high current rating and robust enclosure, it helps facilities meet uptime targets and reduce spare parts costs. Its 1-year warranty provides additional peace of mind for OEMs and maintenance teams in varied environments.
Product Information
Extended Description
DH666FDK Eaton: Heavy Duty, Motor Circuit Safety Switch, Single-Throw, 600A, 600V, Six-pole, Six-wire, Fusible w/o neutral, NEMA 12, Painted galvanized steel, Class H fuses, 200 hp at 240 Vac TD 3 Ph, 400 hp at 480 Vac TD 3 Ph, 500 hp at 600 Vac TD 3 Ph
Product Name
Eaton heavy duty fusible safety switch
Catalog Number
DH666FDK
UPC
786685235325
Product Length/Depth
12.75 in
Product Height
63 in
Product Width
23 in
Product Weight
0.01 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.
Enclosure
NEMA 12
Enclosure material
Painted galvanized steel
Fuse class provision
Class H fuses
Fuse configuration
Fusible without neutral
Number Of Poles
Six-pole
Number of wires
6
Type
Single-Throw
Amperage Rating
600A
HP rating - max
200 at 240 Vac TD 3 Ph, 400 at 480 Vac TD 3 Ph, 500 at 600 Vac TD 3 Ph
NEMA rating
NEMA 12/3R
Voltage rating
600 V
Product Category
Heavy Duty 6-Pole Motor Circuit Safety Switch
Six-pole six-wire design with Class H fuses provides robust protection for large motor circuits, reducing fault duration and improving protection coordination. This configuration streamlines control wiring and simplifies panel layout, delivering tangible time savings during installation and maintenance. Suitable for TD 3-Phase systems, it supports up to 600A at 600V, enabling common electrical architectures in manufacturing lines. Fusible without neutral construction minimizes wiring complexity and helps prevent neutral-related fault paths, reducing panel clutter and lowering assembly errors during commissioning, particularly in multi-motor drives and variable-frequency drive applications. NEMA 12 enclosure with painted galvanized steel delivers reliable dust and water protection in factory environments, while the enclosure's rugged build supports frequent door openings during routine inspections without compromising safety. HP ratings of 200 at 240V, 400 at 480V, and 500 at 600V guide precise protection selection and energy efficiency. Compatibility with standard Eaton catalogs and a one-year warranty simplify procurement and support, ensuring rapid replacement and consistent spare parts across OEM builds. Overall, the DH666FDK combines protective performance, installation efficiency, and durable construction to maximize motor uptime and safe isolation in demanding production environments.
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FAQs
The DH666FDK is designed for industrial motor circuits using a NEMA 12 enclosure and six-wire, six-pole configuration. It supports fusible protection without neutral and is suitable for 3-phase TD applications up to 600V and 600A, aligning with standard motor control panels.
Key ratings include 600A amperage, 600V voltage, six poles with six wires, and a fusible without neutral configuration. It provides horsepower compatibility of up to 200 hp at 240V, 400 hp at 480V, and 500 hp at 600V in TD 3-Ph service.
Yes. The six-pole, six-wire design with fusible protection is specifically intended for three-phase motor circuits, offering reliable isolation and protection for line-start and drive-driven motors in industrial facilities.
It uses a NEMA 12 enclosure with painted galvanized steel, providing environmental protection against dust and moisture. The unit uses Class H fuses for dependable protection and is designed for TD 3-Ph motor circuits up to 600V.
Eaton offers a one-year warranty from installation or eighteen months from shipment, whichever occurs first. The DH666FDK catalog number is compatible with standard Eaton parts stocking, facilitating rapid procurement and consistent spare parts for OEMs and service teams.