FLNR is a type of fuse from Littelfuse, a global industry leader in circuit protection products and solutions. FLNR (Fast-Acting, Low-I2t, Non-Renewable) fuses are designed to offer fast-acting protection in higher current applications, while also preventing resetting and damage due to current inrush. The fuse has a straight-forward design, with three components - an internal current-limiting trigger wire, a thermoset body, and two end caps. The internal trigger wire is connected to the end caps and limits current flow under normal operating conditions. In the event of an overload, the wire melts and quickly interrupts the current flow. The thermoset body contains the melting wire, and the end caps provide a connection point for the control circuit. The design of the FLNR ensures quick reaction times and reliable protection.