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

The Eaton Bussmann KRP-C-1100SP is a Class L, time‑delay, current‑limiting fuse designed for the protection of feeders, motor circuits, and transformers in industrial and commercial power distribution systems. Rated at 1100 amperes and 600 volts AC, it is part of the renowned Low‑Peak family of fuses, known for their ability to withstand temporary overloads and motor starting currents while providing exceptional short‑circuit interruption performance.

Key Features

• Time‑delay (dual‑element) construction – holds 500% of rated current for 10 seconds

• Current‑limiting operation reduces peak let‑through current and I²t

• Class L rejection base prevents replacement with lower voltage/current fuses

• High interrupting rating: 200,000 A rms symmetrical at 600 V AC

• Low watt loss for energy efficiency

• Ferrule terminals (bolt‑on type) for secure connection

• RoHS compliant and halogen‑free

Technical Specifications

Protection Characteristics

The KRP-C-1100SP features a dual‑element design with a separate overload element and short‑circuit element. The overload section provides time‑delay for harmless transient currents such as motor inrush and transformer energization. The short‑circuit element reacts almost instantaneously to high‑level faults, limiting the current and reducing damage to downstream equipment. The fuse is fully rated for AC circuits and can be used in systems with high available fault current.

Applications

• Main service entrance feeders

• Motor control center (MCC) protection

• Transformer primary and secondary protection

• Large motor branch circuits (with proper sizing)

• Busway and switchgear protection

Installation and Coordination

The bolt‑on terminals allow direct mounting to bus bars or fuse blocks with appropriate clearance. The Class L dimension ensures that only Class L fuses can be installed, preventing accidental substitution with lower‑rated fuses. For selective coordination, the time‑delay characteristic helps ensure that the nearest upstream fuse clears the fault without opening main fuses, improving system reliability.

With its rugged construction and proven performance, the Eaton KRP-C-1100SP fuse is a trusted component for protecting critical electrical infrastructure against overloads and short circuits.