Overview
The Bussmann KRP-C-800SP is an Eaton Bussmann Series Class L time-delay, current-limiting fuse engineered for reliable protection in industrial automation and high-capacity electrical systems. Rated at 800 amperes with a 600 VAC (300 VDC) voltage capability, this fuse combines dual-element design with superior arc-quenching characteristics for maximum protection during overload and fault conditions. The KRP-C-800SP meets UL, CSA, and CE standards and is RoHS compliant, making it suitable for modern industrial control panels, mechanical disconnect switches, and large motor branch circuits.
Key Features
- Current-Limiting Technology: Rapidly responds to short circuits, limiting peak let-through current and fault energy
- Time-Delay Characteristic: 4-second minimum delay at 500% rated current allows safe motor inrush without nuisance trips
- High Interrupting Capacity: 300 kA symmetrical at 600 VAC; 100 kA at 300 VDC for extreme fault protection
- Silver-Link Construction: 99.9% pure silver links minimize resistive losses and operating temperature under normal load
- Silica-Sand Filler: High-grade quenching material accelerates fuse response and improves arc extinction
- Class L Cartridge Blade Design: Standard knife-blade termination (bolted blade end) compatible with all Class L fuse holders
Technical Specifications
| Current Rating | 800 A |
| Voltage Rating (AC) | 600 VAC |
| Voltage Rating (DC) | 300 VDC |
| Interrupting Rating (AC) | 300 kA symmetrical at 600 VAC |
| Interrupting Rating (DC) | 100 kA at 300 VDC |
| Fuse Class | Class L |
| Type | Time-Delay, Current-Limiting |
| Time-Delay Response | 4 seconds minimum at 500% rated current |
| Body Material | Glass-Melamine Cartridge |
| Link Material | 99.9% Pure Silver |
| Filler Material | High-Grade Silica Sand |
| Termination Style | Bolted Blade End x Bolted Blade End |
| Dimensions | 2.53″ W × 8.63″ L (63.5 mm × 219.2 mm) |
| Weight | 3.64 lbs |
| Certifications & Standards | UL Listed (Guide JDDZ, File E4273); CSA Certified (Class 1422-02, File 53787); CE Marked; RoHS Compliant |
| Series | Bussmann KRP-C Low-Peak |
Typical Applications
- Large motor branch circuits and starters in industrial plants
- High-capacity electrical distribution panels and switchgear
- Mechanical disconnect switches in automation and control systems
- Plant and facility power distribution requiring 300+ ampere feed protection
- Energy-intensive industrial processes requiring simultaneous overload and short-circuit protection
Compatibility & Replacements
Compatible With
- Class L fuse holders and sockets (standard across industry)
- 600 VAC industrial electrical systems and panels
- 300 VDC DC-power and renewable energy applications
- Motor control centers and variable frequency drives (VFD) line-side protection
- UPS and power distribution systems rated for 600 VAC service
Replaces / Drop-In Replacement For
- Bussmann KRP-C-800 (legacy designation)
- Cooper Bussmann KRP-C-800SP
- Standard Class L 800A fuses from Littelfuse, Mersen, Ferraz Shawmut (verify exact specifications with your distributor)
Works With
- Class L electrical systems and standards (ANSI C37.48 / CSA C22.2 No. 248.10)
- Industrial control automation platforms requiring high-current branch protection
- Switchgear and disconnect devices with Class L fuse compartments
- Power monitoring and circuit protection systems
