Eaton DH661FDK Heavy Duty Fusible Safety Switch - NEMA 12/3R
Part Number: DH661FDK
Quick Summary
Eaton DH661FDK heavy duty fusible safety switch protects industrial electrical circuits and motor controllers in rugged environments. When nuisance trips or field modifications slow production, you need a reliable, code-compliant device that minimizes downtime. The unit carries UL Listed certification for safety compliance and features a durable NEMA 12/3R enclosure that resists dust, water, and contamination, with a field-modifiable option to meet NEMA 3R rainproof requirements for outdoor use. With a 30 A rating and six-pole construction, it supports standard three-phase systems while simplifying wiring and maintenance. This combination delivers long-term lifecycle cost savings for panel builders, OEMs, and maintenance teams seeking robust motor protection and predictable performance.
Product Information
Extended Description
DH661FDK Eaton: Eaton Heavy duty single-throw fused safety switch, 30 A, NEMA 12/3R, Painted galvanized steel, Class H, Fusible without neutral, Six-pole, Six-wire, 600 V, Max Hp: 3-7.5, 5-15, 7.5-20 hp (3PH @240, 480, 600 V), 600 V, #14-#2 Cu/Al
Product Name
Eaton heavy duty fusible safety switch
Catalog Number
DH661FDK
UPC
782113370460
Product Length/Depth
25.5 in
Product Height
9 in
Product Width
13.25 in
Product Weight
40 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
Six-pole
Number of wires
6
Type
Heavy duty fusible safety switch
Amperage Rating
30A
HP rating - max
3-7.5, 5-15, 7.5-20 hp (3PH @240, 480, 600 V)
NEMA rating
NEMA 12/3R
Voltage - max
600 V
Voltage rating
600 V
Product Category
Heavy Duty 6-Pole Motor Circuit Safety Switch
Feature: 30A amperage rating and HP range enable precise motor protection across multiple load scenarios. Business Impact: Reduces nuisance trips and extends motor life by providing appropriate overcurrent protection, lowering maintenance costs. Application: Three-phase conveyors, pumps, and machine tools in manufacturing environments. Feature: NEMA 12/3R enclosure with painted galvanized steel construction. Business Impact: Enhances durability against dust, water, and incidental exposures, improving uptime in harsh shop floors and protected outdoor locations. Application: Industrial panels in demanding environments where reliability is critical. Feature: Class H fuse provision with fusible without neutral configuration. Business Impact: Supports selective coordination and simpler fuse replacement, improving maintainability and safety margins. Application: Motor control centers and disconnect assemblies in processing lines. Feature: Six poles and six wires in a single enclosure. Business Impact: Streamlines wiring, simplifies panel layout, and enables robust multi-line switching for complex motor circuits. Application: Large-capacity motor drives and multi-machine configurations. Feature: Field-modifiable to meet NEMA 3R rainproof requirements. Business Impact: Extends outdoor serviceability without a full enclosure redesign, lowering total cost of ownership. Application: Outdoor equipment bays and process areas with exposure to weather. Insight: The DH661FDK balances rugged construction with installation flexibility, aligning with industry practices for motor protection, energy efficiency, and downtime reduction. Long-term users appreciate predictable performance and simplified maintenance workflows that support a lean operations model.
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FAQs
Yes. The DH661FDK is a six-pole, six-wire unit designed for three-phase systems up to 600 V. It fits standard motor control circuits in industrial panels and aligns with common field wiring practices for hot, neutral, and ground connections. The enclosure is rated for NEMA 12/3R, which supports typical indoor and semi-protected outdoor installations.
The switch carries a 30A amperage rating and supports motor HP ranges of 3-7.5, 5-15, and 7.5-20 hp for 3-phase configurations at 240, 480, and 600 V. This enables efficient protection across a spectrum of standard industrial motors while enabling selective coordination with upstream protections.
The DH661FDK utilizes a NEMA 12 enclosure with painted galvanized steel, providing protection in dusty and damp indoor environments. It can be field modified to meet NEMA 3R rainproof requirements, enabling outdoor use when drainage and weather exposure are addressed via a factory-drilled drain hole and proper installation practices.
The DH661FDK is UL Listed, confirming compliance with relevant safety standards for electrical protection devices. While designed primarily for NEMA 12/3R environments, it offers field-modification options to extend suitability to wetter outdoor locations, maintaining safety and reliability in diverse industrial settings.
Eaton provides a warranty per policy 25-000, with one year from installation or eighteen months from shipment, whichever occurs first. Regular maintenance focuses on verifying fuse integrity, clean terminals, and secure mounting. The robust enclosure and UL listing help reduce downtime and frequency of replacements, delivering predictable long-term return on investment.