Eaton 8CLS-4R Fuse - 7.2 kV Class R Motor Start
Part Number: 8CLS-4R
Quick Summary
Eaton Bussmann CLS fuse protects motor circuits in industrial control systems, delivering reliable overcurrent protection for mechanical drives. Many facilities wrestle with nuisance trips and expensive equipment damage during motor start, undermining uptime and productivity. While certifications vary by region, the CLS fuse aligns with IEEE Std. C37.41 guidance for system protection, and manufacturers recommend confirming mounting and compliance with local codes. The product’s single-barrel, 4R design simplifies installation in compact spaces, while its 7.2 kV rating and 130 A capacity support robust protection across a range of motor sizes. This combination reduces downtime, improves safety, and lowers lifecycle costs by enabling easier integration with Bussmann series accessories and standard switchgear.
Product Information
Extended Description
8CLS-4R Eaton: Eaton Bussmann series 8CLS fuse, Single barrel, 4R designation, 7.2 kV, 130A, 50 kAIC, Motor start, CLS, Class R, Single barrel
Product Name
Eaton Bussmann series CLS fuse
Catalog Number
8CLS-4R
UPC
782116106424
Product Length/Depth
15.9 in
Product Height
3 in
Product Width
3 in
Product Weight
9 lb
Warranty
Not Applicable
Compliances
Contact Manufacturer
Certifications
IEEE Std. C37.41 Not Applicable
Catalog Notes
Consult factory for mountings.
Amperage Rating
130 A
Interrupt rating
50 kAIC
Voltage rating
7.2 kV
Barrels
1
Class
Class R
Special features
Single barrel, 4R designation
8CLS-4R~5982C01G03~FUSE ASSEMBLY 130AMP 4R
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Eaton Specification Sheet - 8CLS-4R
Feature: 7.2 kV voltage rating enables protection for medium-voltage motor circuits and drives, ensuring reliable interrupt performance. Business Impact: Reduces arc energy exposure and enables safer motor-start sequences in demanding industrial environments. Application: Ideal for motor-start protection in manufacturing lines and process plants using Bussmann CLS components. Feature: 130 A amperage rating provides targeted overload protection, safeguarding cables and controllers without nuisance tripping under normal startup loads. Business Impact: Extends equipment life, minimizes unplanned downtime, and lowers maintenance costs. Application: Suitable for protected motor feeders and drive circuits in control panels. Feature: 50 kAIC interrupt rating offers high fault-current capability, ensuring rapid disconnection of severe faults. Business Impact: Improves safety margins for switchgear assemblies and reduces risk of collateral damage. Application: Large panel and bus-connected motor systems where fault currents are substantial. Feature: Single-barrel, 4R design delivers a compact footprint and straightforward installation. Business Impact: Frees space in crowded enclosures and simplifies mounting on standard frames. Application: Motor control centers and compact control panels in machine shops and plants. Feature: Class R fuse type provides reliable, industry-standard protection for motors with startup surges. Business Impact: Delivers predictable performance and compatibility with Bussmann series accessories. Application: Replacement in existing Class R-based protections across industrial drives. Feature: Catalog notes to consult factory for mountings ensure correct, region-specific installation. Business Impact: Reduces installation risk and ensures compliant, robust mounting kits. Application: Custom installations in OEM equipment and retrofit projects where exact mounting is required.
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FAQs
When mounting the 8CLS-4R in a MCC or control panel, ensure the single-barrel form factor fits the available space, observing the 15.9 in depth and 3 in width/height footprint. Use manufacturer-recommended mounting kits and align with the Bussmann series accessories for a secure, code-compliant installation that minimizes thermal and arcing risks.
The fuse provides 130 A nominal rating with a 50 kAIC interrupt capability at 7.2 kV. For motor-start protection, these ratings help limit start-up current escalation while offering a robust margin for short-circuit events. Verify motor load profiles and short-circuit currents to select the appropriate CLS fuse size within the Bussmann family.
The 8CLS-4R is designed to meet industry practice for motor protection and carries IEEE C37.41 references in literature; however, certification status can be region-dependent. Always confirm local regulatory requirements with the manufacturer and your commissioning authority to ensure full compliance and proper integration with UL/IEC-listed components.
The 8CLS-4R is a single-barrel, 4R-design CLS fuse with a 7.2 kV rating and 130 A capacity, optimized for motor-start protection. Compared with multi-barrel or higher-count variants, it offers a compact footprint and straightforward mounting for smaller MCCs while delivering robust interrupt capability suitable for medium-voltage motor feeds.
Using the 8CLS-4R reduces downtime by preventing motor-start transients from tripping feeders, while its high interrupt rating minimizes damage during faults. Its compact form and compatibility with Bussmann accessories simplify spares management and installation, delivering lower lifecycle costs through improved uptime and reduced maintenance interventions.