Littelfuse LLSRK100ID Class RK1 Time-Delay Fuse, 100A

Littelfuse LLSRK100ID Class RK1 Time-Delay Fuse, 100A

The Littelfuse LLSRK100ID from the LLSRK_ID Series is a Class RK1, 100A time-delay (Slo-Blo) fuse built with knife-blade terminals and rated 600VAC/300VDC. It uses patented Indicator™ technology to give instant visual confirmation of a blown fuse, helping maintenance crews cut troubleshooting time and system downtime. Precision-formed short circuit elements and a solid-state overload section combine to protect modern circuits from unexpected electrical faults while resisting the fatigue failures common to spring-loaded designs.

Key Features

• Ampere Rating: 100A for dependable overcurrent protection in Class RK1 applications.
• Electrical Rating: 600VAC / 300VDC with an interrupting rating of 20,000A@300VDC for high fault-current environments.
• Time-Delay Opening: Slo-Blo/Time Lag (T) characteristic reduces nuisance opening and lengthens fuse life under normal cycling and inrush conditions.
• Knife-Blade Package: Knife-Blade terminal design suited for high-ampacity fuse blocks and disconnects.
• Blown-Fuse Indicator: Patented Indicator™ window immediately shows when the fuse has opened — if the window is dark, the fuse is open, cutting diagnostic time.
• Solid-State Overload Section: No moving parts, eliminating the fatigue failures common in spring-loaded overload elements.
• Precision-Formed Elements: Short circuit elements are precision formed to virtually eliminate component damage from unexpected electrical faults.
• Reduced Inventory: Broad application coverage lets facilities standardize on fewer fuse types, reducing spare-parts inventory.

Certifications & Compliance

• UL Listed (UL JDDZ E81895)
• CSA Certified (CSA 1422-02 029862)

Technical Specifications

• VAC (V): 600
• VDC (V): 300
• Ampere Rating (A): 100
• Interrupting Rating: 20000A@300VDC
• Opening: Slo-Blo/Time Lag (T)/Time Delay
• Package Size: Knife-Blade

Typical Applications

• Motor Control and Branch Circuit Protection
• Panelboard and Switchboard Overcurrent Protection
• Industrial Control Panels and Machinery
• Commercial and Industrial Electrical Distribution Equipment
• Facilities Seeking Reduced Fuse Inventory and Faster Fault Diagnosis

Why Littelfuse?

Littelfuse engineers the LLSRK_ID Series with a solid-state overload section, precision-formed short circuit elements, and patented Indicator™ blown-fuse technology to deliver dependable, code-compliant overcurrent protection. Backed by UL Listing and CSA Certification, the LLSRK100ID gives electrical professionals a Class RK1, 100A fuse built to reduce downtime, minimize nuisance opening, and stand up to demanding industrial and commercial circuits.