Eaton DH366FRK-LS Heavy Duty Fusible Safety Switch - NEMA 3R
Part Number: DH366FRK-LS
Quick Summary
Eaton DH366FRK-LS heavy-duty fusible safety switch protects industrial power circuits and service entrances in commercial facilities. Installers often contend with downtime, limited wiring options, and unreliable fault isolation, which this unit mitigates with robust protection and flexible connections. UL Listed, NEC barrier-compliant, and housed in a NEMA 3R enclosure, it provides dependable performance in indoor and certain outdoor environments. For plant operators, the combination of service-entrance readiness, neutral-kit compatibility, and high-current capability translates to reduced maintenance, improved safety, and lower lifecycle costs. This model also supports high-horsepower motors and integrates smoothly with Eaton’s control ecosystem, delivering reliable protection without complicating panel design.
Product Information
Extended Description
DH366FRK-LS Eaton: Eaton Heavy duty single-throw fused safety switch, Long switch, 600 A, NEMA 3R, Painted galvanized steel, Class H, Three-pole, Three-wire, 600 V, Max Hp: 200, 400, 500 hp (3PH @240,480,600 V), (1)#2-(1)600 kcmil; and (1)#1/0-(1)750 kcmil Al
Product Name
Eaton heavy duty fusible safety switch
Catalog Number
DH366FRK-LS
UPC
782116015726
Product Length/Depth
64 in
Product Height
12.77 in
Product Width
23.65 in
Product Weight
160 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.
Compliances
NEC 230.62 (C) Compliant Barrier
Certifications
UL Listed
Catalog Notes
Suitable for service entrance use with a Neutral Kit installed
Enclosure
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 fusible safety switch
Amperage Rating
600A
HP rating - max
200, 400, 500 hp (3PH @240,480,600 V)
NEMA rating
NEMA 3R
Voltage rating
600 V
Product Category
Heavy Duty, Fusible without neutral
600 A amperage rating, a three-pole configuration, fusible without neutral, and 600 V rating deliver immediate fault isolation for large motor loads, reducing arc flash risk and equipment damage while supporting up to 500 hp at three-phase voltages. Business impact: enhanced protection for high-demand drives minimizes downtime and maintenance costs; Application: ideal for manufacturing lines and pumping stations requiring robust, high-current protection. NEMA 3R enclosure, painted galvanized steel, provides weather-resistant protection for both indoor and protected outdoor installations. Business impact: longer service life in varied environments; Application: service entrances and remote plant rooms where environmental exposure is a concern. UL Listed with NEC 230.62 barrier compliance ensures regulatory alignment and safer installations. Business impact: simplifies compliance workflows and improves site safety; Application: critical electrical distribution and service-entrance configurations. Neutral Kit compatibility expands use as a true service-entrance switch, allowing seamless integration into existing distribution schemes. Business impact: reduces retrofit costs and speeds up commissioning; Application: new and retrofit projects requiring service-entrance readiness. Conductor termination accommodates copper and aluminum sizes up to copper #2 to 600 kcmil and aluminum 1/0 to 750 kcmil, enabling flexible wiring strategies. Business impact: supports diverse feeder requirements and simplifies procurement; Application: motor feeders, feeders to MCCs, and large distribution panels.
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FAQs
The DH366FRK-LS excels in service entrances and motor control applications for industrial facilities. With a 600 A rating and NEMA 3R enclosure, it handles large horsepower motors (up to 500 hp at 3PH voltages) while providing robust fault isolation and reliable operation in both indoor and protected outdoor environments.
This unit is a three-pole, 600 V fusible safety switch rated at 600 A. It is fusible without a neutral, configured for high-current protection with Class H fuses, delivering precise interrupting performance for large motor loads and critical feeders in power distribution schemes.
Yes. The DH366FRK-LS is UL Listed and features a NEMA 3R enclosure, offering dependable indoor and sheltered outdoor protection. These certifications and ratings support safer installations, regulatory compliance, and compatible use in harsh environments.
Yes. The catalog notes indicate suitability for service entrance use with a Neutral Kit installed. This expands its applicability to service entrance configurations, enabling proper neutral grounding and compliant feeder arrangements without changing the switch housing.
The switch accommodates copper conductors from #2 to 600 kcmil and aluminum conductors from 1/0 to 750 kcmil. With a 64 in depth, 12.77 in height, and 23.65 in width footprint weighing 160 lb, it provides a substantial installation package for large electrical feeders and centralized motor control.