Littelfuse introduced the compact 777 Series fuse to provide protection for higher-wattage wall-mount chargers for battery powered electronic equipment.
Although chargers for earlier generations of mobile phones had relatively low wattage (typically about 5 W), today’s highly compact chargers must often be able to handle 10 to 15 W of power, which requires withstanding higher levels of current. The axial lead, 3,6 x 9 mm 777 incorporates an innovative type of 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 robust design lets the fuse withstand up to 24 hits of 7,5 kV ringwave surge; 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 20 W power supply modules for other battery-powered consumer electronics.
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