Eaton 7.2WKMSJ315 Medium Voltage Motor Fuse - IEC60282-1
Part Number: 7.2WKMSJ315
Quick Summary
Eaton Bussmann series medium voltage motor fuse protects large motors in industrial facilities. This device is engineered to minimize nuisance outages while delivering dependable protection for critical drive systems. Plants often struggle with unexpected fuse trips and premature motor wear due to misapplication; the 7.2WKMSJ315 addresses this with a 315 A rating at 7.2 kV and 63 kAIC interrupt capability. It complies with VDE 0670-4, DIN 43625, and IEC 60282-1, providing robust regulatory alignment and performance credibility. By integrating this back-up fuse into motor protection schemes, businesses gain uptime improvements, standardized DIN footprint compatibility, and clearer maintenance planning—all without sacrificing safety or reliability. This makes it a sound choice for engineers seeking durable medium voltage protection with proven standards compliance.
Product Information
Extended Description
7.2WKMSJ315 Eaton: Motor fuse-link, medium voltage, 315 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
7.2WKMSJ315
UPC
051712837811
EAN
5027590054713
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
315 A
Interrupt rating
63 kAIC
Resistance
0.87 ohms
Voltage rating
7.2 kV
Watt losses
120 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
Bussmann series complete full line catalog no. 1007
Bussmann series complete full line catalog no. 1007
Feature → Business Impact → Application: The 315 A operating current and 7.2 kV voltage rating deliver reliable protection for medium voltage motors, reducing arc energy and limiting damage during faults, which translates into lower repair costs and shorter downtime in heavy industry. Application: suitable for motor protection in plants with high-load drives and critical processes. Feature → Business Impact → Application: The 63 kAIC interrupt rating provides high fault current clearance, enhancing system safety and enabling upstream protection coordination, which helps protect expensive motor windings and drive electronics. Application: ideal for applications requiring robust short-circuit protection in harsh industrial environments.Feature → Business Impact → Application: DIN 43625 3" footprint and 76 x 442 mm construction size simplify retrofit and new-installations by fitting standard back-up fuse assemblies, avoiding custom housings and speeding installation. Application: retrofit projects and new builds in manufacturing lines.Feature → Business Impact → Application: Back-up fuse class with non-indicating indicators reduces nuisance maintenance while delivering reliable protection, enabling technicians to plan routine checks without confusion. Application: critical motor protection in process lines and packaging equipment.Feature → Business Impact → Application: Watt losses of 120 W reflect energy efficiency considerations in continuous operation, contributing to predictable running costs and thermal management in switchgear rooms. Application: energy-conscious facilities and compliance-driven capital projects.Feature → Business Impact → Application: Compatibility with A3354730 nickel-plated copper fuse clip ensures secure electrical contact and long-term reliability, minimizing resistance drift and contact wear. Application: retrofits and OEM panel assemblies requiring proven clip compatibility.Feature → Business Impact → Application: Compliance with IEC 60282-1, VDE 0670-4, and DIN 43625 standards supports regulatory alignment, supplier qualification, and customer audits, reducing procurement risk. Application: multinational plants and regulated industries demanding traceable fusing solutions.
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FAQs
The 7.2WKMSJ315 is designed around a DIN 43625 3" footprint with a 76 x 442 mm form factor to fit standard back-up fuse assemblies. It uses the A3354730 nickel-plated copper fuse clip for secure, low-resistance contact. Before replacement, de-energize the circuit, verify voltage and current ratings match the motor drive, and ensure proper alignment with the existing clip and mounting hardware to avoid contact resistance and heat buildup.
Key ratings include 315 A amperage, 7.2 kV voltage rating, and 63 kAIC interrupt rating. The amperage rating defines the continuous protective level for the motor circuit, the voltage rating ensures insulation and insulation coordination at high voltage, and the interrupt rating indicates the maximum fault current the fuse can safely interrupt, preventing equipment damage and cascading faults in drive systems.
Yes, for medium voltage motors up to 7.2 kV in demanding environments, the 7.2WKMSJ315 provides robust protection with high fault current interruption. Its DIN footprint and compatibility with standard back-up fuse clips simplify integration into existing motor protection schemes in mining and chemical processing where uptime and fault resilience are critical.
The fuse meets IEC 60282-1 certification and conforms to VDE 0670-4 and DIN 43625 standards. This matters for regulatory compliance, quality assurance, and cross-border procurement, ensuring predictable performance, traceability, and compatibility with international electrical codes and customer audits.
By providing reliable, high-fiability motor protection with a robust interrupt rating and standard DIN footprint, the 7.2WKMSJ315 reduces unexpected trips and minimizes motor damage. This translates to fewer service calls, lower spare parts inventory complexity, and improved uptime for critical manufacturing lines, delivering measurable maintenance cost savings over the asset lifecycle.