RF1907-000 Littelfuse

The RF1907-000 with PTC Resettable Fuses 1812 (4.5*3.2mm) RoHS manufactured by Littelfuse is an electronic device which prevents system faults and reduces electric circuit downtime. It combines a low resistance polymer element with a temperature-sensitive Positive Temperature Coefficient (PTC) fuse, and is rated for 3.25A @120V AC or 3.25A @ 240VAC, with no minimum temperature or voltage rating. The PTC cutoff voltage is 18.75V for the 120 Volt version and 24V for the 240 Volt version. Its small form factor makes it suitable for use in space-constrained applications such as notebooks, hotspots, and handheld electronics. When the current exceeds the rated current, the PTC begins to warm up. At a certain critical temperature, the fusing principle works to break the electrical connection until it cools back down, before providing a response for that short duration. This self-resetting feature offers an added safety advantage. The device provides excellent current-limiting features and is RoHS compliant.