Earlier generations of mobile phones had relatively low wattage (typically about 5W), compared to today’s 10 to 15W, which requires withstanding higher levels of current.

The axial lead, 3.6 x 9mm fuse has filler material that provides a finely tuned balance between the surge tolerance necessary to prevent nuisance fuse tripping with the fuse’s ability to open safely when a short-circuit occurs. The design lets it withstand up to 24 hits of 7.5kV ringwave surge, claims the company. It will open safely on a direct short condition without producing soot, sparks, and sounds. Typical applications include wall-mount smartphone and tablet chargers and 10‑20W power supply modules for other battery-powered consumer electronics.