Eaton Bussmann KRP-C-1100SP Low-Peak Fuse

The Eaton Bussmann KRP-C-1100SP is a premium Class L, time‑delay, current‑limiting fuse rated 1100 amperes at 600 volts AC. It is engineered to protect electrical distribution systems from damaging overloads and short circuits while withstanding normal transient currents such as motor inrush and transformer excitation. The Low‑Peak design ensures optimal coordination with downstream overcurrent devices, minimizing nuisance tripping and enhancing system selectivity.

Key Features

• Time‑delay characteristic – passes 500% of rating for 10 seconds

• Current‑limiting technology reduces let‑through energy (I²t)

• Class L physical dimensions prevent improper substitution

• High interrupting rating: 200,000 A rms symmetrical

• Low watts loss for energy savings

• Bolt‑on terminals for reliable, high‑pressure connections

• Meets UL 248‑10 and CSA C22.2 No. 106 standards

Technical Specifications

Performance and Protection

The KRP-C-1100SP incorporates a dual‑element design that separates overload handling from short‑circuit interruption. The overload section uses a thermal alloy that responds to prolonged overcurrents but ignores brief inrush. The short‑circuit section uses a fast‑acting element that clears faults in less than half a cycle, limiting peak current and reducing stress on transformers, cables, and switchgear. This fuse is ideal for applications where high fault currents are possible and where protection coordination is critical.

Applications

• Main service entrance protection

• Feeder circuits in industrial plants

• Motor control centers (MCC) mains

• Transformer primary and secondary protection

• Switchboard and panelboard mains

Installation and Coordination

The bolt‑on terminals ensure a secure, low‑resistance connection to bus bars or fuse blocks. The Class L rejection feature guarantees that only Class L fuses can be installed, preventing accidental use of lower‑rated fuses. For selective coordination, the time‑delay allows downstream fuses to clear faults without opening the upstream KRP-C‑1100SP, improving system availability.

Trusted by engineers worldwide, the Eaton KRP-C-1100SP Low-Peak fuse delivers reliable protection for critical power infrastructure, ensuring safety and continuity of service.