LOO LIKE UNUSUAL The Littelfuse SLO-BLO Fuse FLSR 100 600V AC Class RK-5 is a high-quality electrical component designed for industrial use. This fuse is rated for AC currents with a voltage range of 551-600V and is made of durable copper material. The SLO-BLO design ensures reliable protection against overcurrent situations, making it a reliable choice for electrical equipment and systems requiring a high level of safety and performance.