Littelfuse KLKR Series 600V Class CC Fast-Acting Fuse

Littelfuse KLKR Series 600V Class CC Fast-Acting Fuse

The Littelfuse KLKR Series is a line of Class CC fast-acting fuses rated 600VAC / 300VDC, available in ampere ratings from 0.5A to 20A to match branch circuit protection needs across OEM equipment and control panels. Each KLKR fuse combines a compact size, fast-acting overload response, and a highly current-limiting design, making the series well suited for protecting solid-state devices such as SCRs and other electronic equipment that generally require fast-acting protection. Compared to other UL Listed fuses, Class CC fuses are the most current limiting, rating for rating, giving the KLKR Series a reliable 200,000 A.I.R. interrupting rating in one of the smallest 600V fuse packages approved for branch circuit protection.

Key Features

• Amp Rating Range: Available in ratings from 0.5A to 20A (0.5A, 2A, 2.5A, 3A, 4A, 5A, 8A, 10A, 15A, and 20A) for precise overcurrent protection across a wide range of branch circuits.
• Voltage Rating: 600VAC / 300VDC, suitable for a wide range of industrial control and OEM applications.
• Fast-Acting (F) Response: Opens quickly under overload to protect sensitive solid-state devices such as SCRs and other electronic equipment.
• Extremely Current Limiting: Reduces damage caused by the heating and magnetic effects of short-circuit currents, stopping damaging short-circuit faults faster than any mechanical protective device.
• Most Current Limiting in Class: Compared to other UL Listed fuses, Class CC fuses are the most current limiting, rating for rating.
• 200,000 A.I.R.: Reliable interruption of all overcurrents up to 200,000 amperes across the entire KLKR Series.
• Class CC Package Size: One of the smallest 600V, 200,000 A.I.R. fuse packages approved for branch circuit protection, providing superior protection in a fraction of the space required by other fuse classes.
• Space-Saving Design: Replacing 600V, three-pole, 30A Class R fuse blocks with Littelfuse Class CC fuse blocks reduces panel-mounting space by approximately 70%.

Certifications & Compliance

• UL Listed
• CSA Certified
• CE Marked
• China RoHS Compliant

Technical Specifications

• Refer to manufacturer documentation for complete technical specifications.

Typical Applications

• OEM Equipment and Control Panels
• General-Purpose Branch Circuit Protection
• Solid-State Device Protection (SCRs and Other Electronic Equipment)
• Panels Requiring Reduced Mounting Space vs. Class R Fuse Blocks
• Industrial and Commercial Electrical Systems Requiring 200,000 A.I.R. Protection

Why Littelfuse?

The Littelfuse KLKR Series combines extremely current-limiting performance with a compact Class CC footprint, letting panels replace larger 600V, three-pole, 30A Class R fuse blocks while reducing panel-mounting space by approximately 70%. Backed by a 200,000 A.I.R. interrupting rating, a fast-acting design, and ampere ratings from 0.5A to 20A, the KLKR Series delivers reliable, code-compliant overcurrent protection for OEM equipment and industrial control panels, with UL, CSA, CE, and China RoHS documentation supporting its use in professional electrical installations.