Eaton 7.2WKMSJ355 Motor Fuse - IEC60282-1 MV Backup
Part Number: 7.2WKMSJ355
Quick Summary
Eaton 7.2WKMSJ355 motor fuse protects medium voltage motors in demanding industrial settings. Engineers often struggle with reliable motor protection that minimizes nuisance outages and unplanned downtime, especially in high‑voltage lines. This device aligns with IEC60282-1 and DIN 43625 (VDE 0670-4) to deliver dependable performance and regulatory compliance. As a Bussmann series back‑up fuse, it supports robust motor protection while simplifying maintenance and spare parts management. With a 355 A rating and 7.2 kV capacity, it enables efficient risk management, reduced fault propagation, and predictable repair cycles for critical equipment. Ideal for facilities pursuing consistent uptime and cost efficiency in MV motor protection applications.
Product Information
Extended Description
7.2WKMSJ355 Eaton: Motor fuse-link, medium voltage, 355 A, AC 7.2 kV, DIN 43625 3", 76 x 442 mm, back-up, DIN, with striker HS
Product Name
Eaton Bussmann series medium voltage motor fuse
Catalog Number
7.2WKMSJ355
Model Code
7.2KV 355A 3" MOTORSTART FUSE
UPC
051712837828
EAN
5027590054720
Product Length/Depth
442 mm
Product Height
76 mm
Product Width
76 mm
Product Weight
5200 g
Warranty
Not Applicable
Compliances
VDE 0670-4 DIN 43625
Certifications
IEC60282-1
Amperage Rating
355 A
Interrupt rating
63 kAIC
Resistance
0.72 ohms
Voltage rating
7.2 kV
Watt losses
125 W
Application
Motor protection
Barrels
1
Class
Class back-up
Construction size
76 x 442 mm
Fuse indicator
Non Indicating
Fuse type
WKMSJ
Used with
A3354730 Nickel-plated copper fuse clip
Packaging type
Standard
Type
fuse
7.2WKMSJ355~7-2WKMSJ355~7.2KV 355Amp 3 MOTORSTART FUSE
7.2WKMSJ355~7-2WKMSJ355~7.2KV 355Amp 3 MOTORSTART FUSE
The 7.2WKMSJ355 features 7.2 kV voltage rating and a 355 A amperage rating, delivering precise overcurrent protection for medium voltage motors. This translates to a measurable reduction in electrical faults and downtime, enabling safer startup sequences and more predictable plant performance in industrial environments. The 63 kAIC interrupt rating provides high fault current tolerance, protecting both motor and switchgear while maintaining system integrity during short-circuit events. Its DIN 43625 3" form factor (76 x 442 mm) with a single barrel design simplifies mounting and clearance in crowded MCCs, reducing installation time and potential wiring errors. The non-indicating indicator requires appropriate remote status monitoring, while the striker HS feature supports rapid replacement after a fault. Compatibility with A3354730 nickel-plated copper fuse clips enhances secure electrical contact and long-term reliability. Watt losses of 125 W and resistance of 0.72 ohms reflect typical loss profiles for MV motor fuses, informing cooling and thermal management planning. This fuse is designed for back‑up applications, offering a robust protection layer that supports compliance with DIN and IEC standards while delivering measurable efficiency gains in motor protection practices. These attributes together address common industry objections about reliability, maintenance complexity, and total cost of ownership, delivering a holistic solution for MV motor protection programs and spare-part optimization.
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FAQs
The 7.2WKMSJ355 uses a 3 inch DIN 43625 form factor with a 76 x 442 mm footprint, designed to fit standard Bussmann series back‑up configurations. It is used with the A3354730 nickel‑plated copper fuse clip for secure electrical contact and straightforward installation in typical motor control centers.
Key ratings include a 7.2 kV voltage rating, 355 A amperage rating, and a 63 kAIC interrupt rating. These specify the fuse’s ability to withstand inrush and fault currents, while the 0.72 ohm resistance and 125 W watt losses inform thermal management and efficiency planning in MV motor protection applications.
Yes. It complies with DIN 43625 and VDE 0670-4 as part of its general specifications, and IEC 60282-1 certification ensures compatibility with international MV motor protection standards. This makes it suitable for demanding industrial environments where regulatory compliance and reliable protection are priorities.
The WKMSJ back-up design provides robust protection against motor faults, potentially reducing downstream equipment damage. While the fuse indicator is non‑indicating, remote status monitoring or periodic checks can be implemented to minimize downtime. The 76 x 442 mm envelope and standard components streamline part stocking and replacement procedures.
Expected benefits include lower fault severity, reduced unplanned outages, and predictable maintenance planning. Compatible with standard clips and DIN formats, it simplifies procurement and spares management. The combination of high interrupt rating and proven standards support faster fault resolution and longer motor life, improving total cost of ownership.