Littelfuse FLSR3ID Panel Mount Indicator Light

Littelfuse FLSR3ID is an Indicator fuse from the FLSR_ID family (RK5 class) designed for overcurrent protection in industrial control circuits. This dual-element, time-delay fuse carries a 3 A current rating and a 600 V AC rating, with a 300 V DC rating, and includes an indicating feature that provides a visual status cue when the fuse has blown, enabling quick fault recognition without removing the component. The RK5 family designation marks it as UL-listed for overcurrent protection with a built-in visual indicator, suitable for control circuits, power supplies, and machinery where inrush tolerance and clear status indication are required. The part is cataloged as FLSR003ID (often listed as FLSR-3 ID) and is widely stocked by distributors such as Grainger, Newegg, and Crescent Electric, confirming the same 3 A/600 V (AC) / 300 V (DC) specifications and time-delay characteristics. The FLSR_ID series is designed to protect circuits while allowing short inrush events, and its indicating variant helps maintenance personnel identify a blown fuse at a glance, improving safety and uptime in panel-based control environments.