Eaton 7.2WKNHA250 Motor Fuse - BS 2692-1
Part Number: 7.2WKNHA250
Quick Summary
The Eaton Bussmann series medium voltage motor fuse protects motors in industrial plants with reliable short-circuit protection at 7.2 kV. It addresses downtime and nuisance outages caused by undersized or incorrectly rated fuses in MV motor circuits. BS 2692-1 compliance supports regulatory alignment, while back-up class and built-in striker features help protect expensive motors. Designed for OEMs and maintenance teams, it enables reliable motor protection with scalable MV protection and straightforward installation. With 7.2 kV operation and a 250 A rating, it safely accommodates high-power motors in demanding environments. This integration supports uptime goals, lowers lifecycle costs, and simplifies spare parts planning across multi-site facilities.
Product Information
Extended Description
7.2WKNHA250 Eaton: Motor fuse-link, medium voltage, 250 A, AC 7.2 kV, 76 x 403 mm, back-up, BS, MV, with striker
Product Name
Eaton Bussmann series medium voltage motor fuse
Catalog Number
7.2WKNHA250
EAN
5027590488815
Product Length/Depth
403 mm
Product Height
76 mm
Product Width
76 mm
Product Weight
4320 g
Compliances
BS 2692-1
Amperage Rating
250 A
Interrupt rating
40 kAIC
Voltage rating
7.2 kV
Application
Motor protection
Class
Class back-up
Construction size
76 x 403 mm
Fuse type
WKNH
Used with
A3354730 Nickel-plated copper fuse clip
Packaging type
Standard
Type
fuse
Feature: The 250 A amperage rating and 40 kAIC interrupt capacity enable fast fault clearance in medium voltage motor circuits, reducing stress on windings and bearings. Business impact: shorter downtime, lower maintenance costs, and extended motor life in demanding MV applications. Application: ideal for large motors in packaging, water treatment, and process industries. Feature: As a back-up class fuse with a 7.2 kV rating, it delivers predictable performance and enhanced protection during faults, supporting safer operation and easier diagnostics. Business impact: improved fault visibility reduces repair time and speeds line downtime recovery. Application: suitable for mission critical drives in petrochemical plants and metal processing. Feature: Compatible with the A3354730 nickel plated copper fuse clip, ensuring secure contact and straightforward replacement. Business impact: simpler spares management and faster field service. Application: retrofit and new installations in control panels and motor control centers. Feature: The 403 mm length and 76 mm width height footprint, combined with standard packaging, streamline installation and retrofit in existing MV protection assemblies. Business impact: reduced installation effort and consistent alignment with MCCs. Application: mid to large scale motor protection in conveyors and pumps. Feature: BS 2692-1 compliance and fuse type WKNH classification provide consistent back-up protection with known arc energy characteristics. Business impact: regulatory alignment and predictable performance across multi-site operations. Application: industrial facilities requiring robust motor protection and standardized components. Feature: Built in striker indicator enhances trip status visibility, enabling quicker maintenance actions and uptime recovery. Business impact: faster fault confirmation and reduced mean time to repair. Application: field service and panel upgrades in production facilities.
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FAQs
The 7.2WKNHA250 is designed to work with the A3354730 Nickel-plated copper fuse clip, providing secure contact in standard MV motor protection assemblies. Its 403 mm length and 76 mm width by height footprint fit typical MCCs and motor control centers. For retrofit projects, ensure the clip is clean, properly seated, and tightened to manufacturer torque specifications to maintain reliable current interrupt performance.
This fuse is rated for 250 A continuous amperage with an interrupt rating of 40 kAIC, suitable for safely clearing faults in 7.2 kV motor circuits. The 7.2 kV voltage rating supports high voltage motor protection, while the back-up WKNH designation indicates a class back-up fuse design, optimized for predictable fault response in MV applications.
Yes. It is specifically designed as a back-up fuse for medium voltage motor protection schemes, offering reliable fault interruption and a clearly visible striker indicator to confirm trip status. This makes it suitable for critical equipment in manufacturing lines, pumps, and conveyors where uptime and fault traceability are essential.
The fuse complies with BS 2692-1, establishing a recognized standard for back-up protection devices in MV motor circuits. This compliance helps ensure regulatory alignment across facilities and supports consistent performance characteristics in protection schemes used in industrial plants and OEM installations.
The 7.2WKNHA250 provides durable construction and a compatible fuse clip that simplifies stocking and field replacement, reducing downtime during maintenance. Its high interrupt rating minimizes arc energy and equipment wear, extending motor life and lowering total cost of ownership through fewer unplanned outages and easier parts management in multi-site operations.