Overview
The Bussmann KRP-C-1600SP is a high-capacity Class L current-limiting, time-delay fuse engineered for industrial main feeders and large branch circuits. Rated at 1600A and 600V AC, this fuse delivers 300 kA of interrupting capacity at AC and 100 kA at 300V DC, making it ideal for protecting substations, motor control centers, and heavy industrial distribution systems from both overload and short-circuit faults.
Key Features
- Current-Limiting Technology: All-purpose silver-linked fuse for both overload and short-circuit protection for high capacity systems
- Time-Delay Characteristic: 4 seconds (minimum) at 500% of rated current, reducing nuisance trips during harmless inrush currents
- Low-Peak Design: Minimizes peak let-through current and voltage stress on downstream equipment
- Glass Melamine Tube Construction: Durable body with silver-plated end bells for reliable bolt-mount connections
- Multiple Certifications: UL Listed, Guide JDDZ, File E4273; CSA Certified, Class 1422-02, File 53787, Class L per CSA C22.2, No. 248.10; CE; RoHS compliant
Technical Specifications
- Current Rating: 1600A
- Voltage Rating: 600V AC / 300V DC
- Interrupting Rating (AC): 300 kA RMS Symmetrical at 600V AC
- Interrupting Rating (DC): 100 kA at 300V DC
- Fuse Class: Class L
- Speed Characteristic: Time-Delay (Dual-Element)
- Time-Delay at 500% Rated Current: 4 seconds minimum
- Body Material: Glass/Melamine tube with silver-plated end bells
- Mounting Style: Center-bolted (blade terminals)
- Dimensions: 3″ Diameter × 10¾” Length (76.2 × 254 mm)
- Weight: 5.73 lbs
- Series: KRP-C (601–2000A range)
Typical Applications
The KRP-C-1600SP is widely used in:
- Main distribution feeders in industrial substations and switchgear
- Large motor control centers (MCC) and feeder protection
- Heavy industrial machinery and process equipment circuits
- Power distribution panels and disconnect switches
- Data centers and critical infrastructure power distribution
- OEM equipment requiring UL/CSA-listed overcurrent protection
Compatibility & Replacements
Compatible With
- Class L fuse holders and cartridge mounting hardware (center-bolted)
- UL-compliant industrial panel boards and switchgear
- NEMA-certified power distribution equipment
- Standard 600V AC industrial electrical systems
- Equipment rated for 300V DC backup or dual-voltage applications
Replaces / Drop-In Replacement For
- Other designations include KRP-C1600, KRP-C 1600, KRP-C-1600, KRPC-1600, and KRPC1600SP
- Functionally equivalent to Ferraz Shawmut A4BQ (verify with system integrator)
- Mersen/Ferraz Class L fuses in the 1600A rating (consult technical specifications before substitution)
Works With
- Class L bolt-mount fuse holders and cartridge enclosures
- Standard industrial power distribution architectures (NEMA/IEC)
- Equipment designed to UL 248-10 and CSA C22.2 No. 248.10 standards
- Voltage-rated systems from 300V DC to 600V AC
