Overview
The Bussmann KRP-C-1600SP is a Class L time-delay, low-peak current-limiting fuse designed for industrial power distribution, motor control centers, and large-feeder circuit protection. Manufactured by Bussmann (now part of Eaton), this 1600-amp fuse combines dual-element construction with silver-linked technology to deliver reliable overload and short-circuit protection in high-capacity systems. The KRP-C-1600SP is widely used in manufacturing facilities, data centers, utility substations, and commercial electrical systems.
Key Features
- Class L, Bolt-Mount Design: Center-bolted cartridge style with 3-inch diameter and 10.75-inch length for standard power distribution installations
- Time-Delay Protection: 4-second minimum delay at 500% rated current, allowing brief inrush current without nuisance trips
- Current-Limiting: Melamine tube with silver-plated end bells reduces fault current magnitude and peak let-through current, protecting downstream equipment
- Dual-Element Construction: All-purpose silver-linked fuse for both overload and short-circuit protection in high-capacity circuits
- Multiple Certifications: UL Listed (Guide JDDZ, File E4273), CSA Certified (Class 1422-02, File 53787), CE marked, and RoHS compliant
Technical Specifications
| Specification | Value |
| Manufacturer | Bussmann (Eaton) |
| Part Number | KRP-C-1600SP |
| Current Rating | 1600 Amp |
| Voltage Rating (AC) | 600 VAC |
| Voltage Rating (DC) | 300 VDC |
| Interrupting Rating (AC) | 300 kA (RMS symmetrical) at 600 VAC |
| Interrupting Rating (DC) | 100 kA at 300 VDC |
| Fuse Class | Class L |
| Type | Time-Delay, Current-Limiting |
| Time-Delay Characteristic | 4 seconds minimum at 500% rated current |
| Body Material | Glass/Melamine tube with silver-plated end bells |
| Mount Style | Center Bolted (Bolt-On) |
| Diameter | 3 inches (76.2 mm) |
| Length | 10.75 inches (254 mm) |
| Weight | 5.73 lbs |
| Standards & Approvals | UL 248-10, CSA C22.2 No. 248.10, CE, RoHS |
| Series | KRP-C (601–2000 amp range) |
Typical Applications
- Main feeders and large-capacity branch circuits in industrial plants
- Motor control centers and variable frequency drive protection
- Utility distribution systems and switchgear cabinets
- Data center power distribution units (PDUs) and uninterruptible power supplies (UPS)
- Commercial HVAC, refrigeration, and compressor circuits
- Factory automation and robotics power systems
Compatibility & Replacements
Compatible With
- Standard Class L fuse holders and bolt-mount sockets (center-bolted configuration)
- Industrial power distribution systems rated for 600 VAC, 3-phase
- Single-phase 600 VAC service equipment
- Motor control centers (MCCs) and main disconnect switches
- Load centers and panelboards with Class L fuse provisions
Replaces / Drop-In Replacement For
- Ferraz A4BQ series (1600 A) — functionally equivalent dual-element Class L low-peak fuse
- Littelfuse Class L equivalent models in 1600 A, 600 VAC, time-delay configuration (verify part number prior to substitution)
- Other OEM-branded Class L 1600A low-peak fuses with matching bolt-mount dimensions
Works With
- Class L bolt-mount fuse clips and contacts
- Power distribution and protection engineering software (load studies, arc flash analysis)
- Motor control and VFD protection schemes
- NFPA 70 (NEC) compliant electrical systems
- Eaton/Bussmann coordinated protection coordination charts and tables
