EATON Bussmann Class L Fuses for Protection of Feeders and Service Entrance Equipment


EATON Bussmann Low-Peak™
KRP-C Class L, 600Vac/300Vdc Time Delay Fuse for Short Circuit and Overload Protection


The EATON Bussmann KRP-C fuse type, available in 601 to 6000A, is an all-purpose fuse for short circuit and overload protection of high capacity systems.

This Class L series is a current-limiting fuse that will interrupt a minimum of 200,000 amps.  The 601-2000A and the 3000A units carry a 300,000 amp interrupting rating. KRP-C power fuses are a member of EATON’s Cooper Bussmann Branch Circuit, Power Distribution Fuses.

Time Delay Fuse Vs. Fast Acting Fuse

This Low-Peak™ Time Delay fuse is used in high power systems such as mains (the main power line) and large feeders (peripheral to main). Different than fast-acting fuses, the Bussmann KRP-C Class L is a time-delay fuse that passes harmless surge currents of motors, transformers and other power equipment eliminating the need for over-fusing without giving up short circuit, current-limiting component protection.

A combination of 1⁄10 to 600A Low-Peak™ dual element time-delay fuses (LPS-RK, LPN-RK) and 601 to 6000A KRP-C Low-Peak™ fusing is suggested for total system protection.

Easily Selective Coordination

The Bussmann KRP-C series can be selectively coordinated for blackout protection. Plus, the upstream fuse size needs to be only twice the size of downstream Low-Peak™ fuses (2:1 ratio). Low-Peak™ fuses can protect circuit breakers with low interrupting rating as well as provide excellent overall protection of circuits and loads.

For KRP-C Class L 601-2000A specifications, Refer to Bussmann Data Sheet No. 1008
For KRP-C Class L 2001-6000A specifications, Refer to Bussmann Data Sheet No. 1009


EATON Bussmann KRP-CL 600Vac 225-600A, Time Delay Fuses (800A Class L case size)

The EATON Bussmann KRP-CL series is a current-limiting fuse with the same performance characteristics as the KRP-C fuses and carry a 200,000 amp interrupting rating. This series is made for applications needing a Class L dimension fuse with a 225-600A rating.  All KRP-CL fuses are built with the same dimensions as 800A Class L fuses.

For KRP-CL 600Vac, 225-600A specifications, Refer to Bussmann Class L Data Sheet No.1016

EATON Bussmann KTU & KLU Class L Limitron® 600Vac 601-6000A Fast Acting and Time Delay Fuses

The EATON Bussmann Limitron® KTU 600Vac Fast Acting fuse is designed with a 200,000 amp interrupting rating for short circuit protection in circuits with inrush currents. The Bussmann Limitron® fast acting single-element fuses have no intentional time-delay.

They offer a high degree of current limitation and provide excellent protection of components. Limitron® fuses require oversizing to avoid opening caused by harmless overloads. In motor circuits, the Limitron® KTU should be sized around 300% of motor full-load current.

The EATON Bussmann Limitron® KLU 600Vac Time-Delay fuse also carries a 200,000 amp interrupting rating. This current-limiting design Class L fuse has a 5 second delay (minimum) at 500% of rated current. It is not as current-limiting as the KRP-C or KTU fuses. It is ideal for critical applications that have specific current limitation requirements

For Limitron KTU Fast Acting specifications, Refer to Bussmann Class L Data Sheet No. 1010
For Limitron KLU Time Delay specifications, Refer to Bussmann Class L Data Sheet No. 1013

Fuse Selection & Sizing for Power Distribution Systems

Power distribution systems handle a wide range of currents. You can avoid fuse sizing mistakes when selecting and correctly sizing replacement fuses for power distribution systems. Proper fuse selection depends on many factors, so consult a professional engineer for your application.

Monster Fuses is a Factory Authorized Provider of EATON Bussmann Class L Fuses,  Power Fuse Hardware and all major fuse lines.

Monster Electrical is a “knowledge-based” independent distributor of fuses, fuse hardware and control equipment. We don’t just ship boxes. Our product and application knowledge goes into every transaction.

Monster Fuses provides immediate shipment of power fuses and power fuse mountings from our extensive inventory. Clients can access more than 14,000 power fuse solutions provided from a stock of 100,000+ fuses, eliminate long factory power fuse lead times, and supply real time solutions for urgent fuse challenges in utility, industrial, institutional and commercial applications.

Monster Controls provides immediate shipment of 5kV Class control components. Clients can access thousands of 5kV class control parts from an extensive inventory, eliminate long factory lead times and supply real time solutions for electrical control challenges.

Specializing in parts for 2.3kV, 5.5kV and 7.2kV motor starters, contactors and switches, Monster Controls also stocks complete starters, contactors and switches.

Need help calculating fuse current ratings for transformers or selecting fuse hardware, power equipment and electrical replacement parts? Call 888-444-4335 in the West or 877-444-1798 in the EAST.



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