Overview
The KRP-C-800SP is a Bussmann low-peak time-delay Class L fuse engineered for industrial branch circuits and high-capacity electrical distribution systems. As a current-limiting, non-indicating bolt-on fuse, it combines time-delay overload protection with instantaneous short-circuit response, making it ideal for machinery disconnects, distribution switchboards, and large power panelboards that demand both nuisance-trip resistance and ultimate fault-clearing capability.
Key Features
- Low-peak current-limiting technology reduces let-through energy during short circuits
- Time-delay characteristic provides 4-second response at 500% rated current
- Dual-element design with melamine cartridge body for thermal and magnetic coordination
- Bolted blade end terminals for direct panel mounting
- 300 kA interrupting rating at 600VAC; 100 kA at 300VDC for enhanced fault protection
- Non-indicating, non-rejection Class L body for broad application flexibility
Technical Specifications
- Rated Current: 800 A
- Voltage Rating: 600 VAC / 300 VDC
- Interrupting Rating: 300 kA (RMS symmetrical) at 600 VAC; 100 kA at 300 VDC
- Fuse Class: L (UL 248-10)
- Type: Time-Delay, Current-Limiting
- Response Time: 4 seconds at 500% rated current
- Body Material: Glass/Melamine cartridge
- Terminal Style: Bolted blade end x bolted blade end
- Body Size: 2.5 in diameter × 8.63 in length (63.5 mm × 219.2 mm)
- Weight: 3.64 lbs
- Approvals: UL 248-10 (JFHR File E56412), CSA Class 1422-02 (File 53787), CE, RoHS 2011/65/EU compliant
Typical Applications
The KRP-C-800SP is commonly deployed in:
- Large distribution switchboards and feeder circuits
- Industrial machinery disconnects and motor control centers
- Power panelboards in factories and production facilities
- Safety and security systems requiring high-reliability branch protection
- Heavy equipment supply circuits where coordinated protection is critical
Compatibility & Replacements
Compatible With
- Class L fuse holders and bolted-blade disconnect switches
- 600 VAC industrial power distribution systems
- UL-listed panelboards and switchgear rated for Class L fuses
- System coordination with time-delay and instantaneous overcurrent relays
Replaces / Drop-In Replacement For
- Functionally equivalent to Ferraz Shawmut A4BQ 800A fuses
- Direct replacement within KRP-C 800A family (KRP-C 800 Amp, KRP-C-800, KRP-C-800A variants)
- Part number cross-references include KRPC800SP, KRPC-800SP, KRP-C800
Works With
- UL standard UL 248-10 Guide JFHR overcurrent protective devices
- CSA standard Class 1422-02 and C22.2 No. 248.10 certified systems
- NFPA 70 (National Electrical Code) compliant installations
- Coordination with thermal-magnetic and digital overcurrent relays in industrial control systems
