Overview
The Bussmann KRP-C-4000 is a Class L low-voltage fuse engineered for high-amperage power distribution and branch circuit protection in industrial facilities. Manufactured by Eaton’s Bussmann series, this time-delay current-limiting fuse combines rapid short-circuit suppression with a 4-second time delay at 500% rated current, making it ideal for motor loads and large feeders where coordination is critical. The KRP-C-4000 is rated 4000A at 600VAC and carries a 300kA interrupting rating, meeting UL and CSA standards.
Key Features
- Class L current-limiting time-delay fuse with 4-second minimum delay at 500% rated current
- Silver-linked construction for low resistive losses and minimal operating temperature rise
- Silica sand filler with O-ring seals accelerates quenching action during faults
- Bolted blade end connection for robust mounting in high-current switchboards and panel disconnects
- 99.9% pure silver links reduce total clearing I²t fault energy and watt loss
- UL Listed (Guide JDDZ, File E4273) and CSA Certified (Class 1422-02, File 53787)
Technical Specifications
The KRP-C-4000 provides selective coordination within the Low-Peak fuse family via a consistent 2:1 ampacity ratio, preventing unwanted electrical shutdowns in distributed systems.
Typical Applications
- Large distribution switchboards and power panel boards
- High-capacity feeder and main circuit protection
- Motor branch circuits on large industrial machinery disconnects
- Mains protection in power systems requiring selective coordination
- Heavy industrial HVAC and process automation equipment
Compatibility & Replacements
Compatible With
- Standard Class L fuse clips and bolted-blade cartridge holders
- Eaton, Square D, Siemens, and other major industrial panel boards rated for Class L fuses
- Any 600VAC, 300VDC branch circuit protection scheme requiring 4000A fuses
Replaces / Drop-In Replacement For
- Older KRP-C-4000SP units (identical electrical and mechanical ratings)
- Cooper Bussmann KRP-C-4000 legacy equivalents
- Verify compatibility with your system integrator before ordering for direct replacement applications
Works With
- All standard Class L 600V/300V DC fuse applications
- Industrial motor control centers (MCCs) with selective coordination requirements
- Power factor correction banks and harmonic filtering systems
