Overview
The Bussmann KRP-C-601SP is a Class L current-limiting, time-delay fuse engineered for industrial electrical distribution systems. Rated at 601A, 600V (or 300V DC), this fuse delivers a 300kA interrupting rating and combines short-circuit protection with overload tolerance, making it suitable for applications requiring coordinated backup protection in high-capacity switchgear and panelboards.
Key Features
- Class L cartridge fuse with 300kA (AC) / 100kA (DC) interrupting rating
- Time-delay characteristic: 4-second minimum delay at 500% rated current for transient tolerance
- Current-limiting design reduces fault energy and arc flash hazard
- Silver-plated end bells and glass-melamine tube construction for durability
- Low-Peak® technology for superior short-circuit performance
Technical Specifications
- Ampere Rating: 601 A
- Voltage Rating: 600 Vac; 300 Vdc
- Interrupting Rating (IR): 300 kA @ 600 Vac (RMS Sym); 100 kA @ 300 Vdc
- Time Delay: 4 seconds minimum at 500% rated current
- Fuse Type: Class L, Current-Limiting, Time-Delay Cartridge
- Construction: Glass-Melamine Tube with Silver-Plated End Bells
- Dimensions: 2.5″ Diameter × 8⅝” Length (63.5 × 203.2 mm)
- Weight: 3.64 lbs
- Approvals: UL Listed (Guide JDDZ, File E4273); CSA Certified (Class 1422-02, File 53787); CE Marked; RoHS Compliant
Typical Applications
The KRP-C-601SP is suited for:
- Main feeder and branch protection in industrial power centers and switchgear
- Coordinated backup protection in motor control centers and disconnect switches
- High-capacity transformer and distribution system secondary protection
- Commercial and industrial electrical systems operating at 600V or below
- Applications requiring fast short-circuit response with delayed overload tolerance
Compatibility & Replacements
Compatible With
- Class L fuse holders and clips rated for 601A and above
- Industrial switchgear and panelboards designed for Class L cartridge fuses
- Motor control centers and disconnect switches with Class L mounting
- Power distribution systems rated 600V or lower (AC or DC)
- UL 508A-compliant equipment and CSA certified electrical systems
Replaces / Drop-In Replacement For
The KRP-C-601SP replaces earlier and OEM-equivalent Class L fuses of the same rating. Verify compatibility with your system integrator or equipment documentation before ordering to ensure proper fit and electrical coordination.
Works With
- Class L UL 248-12 and CSA C22.2 No. 248.10 compliant electrical systems
- Power systems using current-limiting fuse coordination
- Industrial control and electrical protection schemes
- Backup protection in systems with motor starters and contactors
