Püschel Feinsicherungen manufactures the FSSF4,0B micro fuse, which is a 5 mm x 20 mm quick-acting glass cartridge fuse. This fuse is rated for 4 A at 250 V and is ideally used for applications requiring fast response to overcurrent. Typically, it is suitable for protecting sensitive electronic devices and circuits. https://elecena.pl/product/28734884/p-xfc-schel-fssf40b-micro-fuse-5x20mm-4a-250v-fast-acting-10-pieces 2025-05-19 https://elecena.pl/product/28734884/p-xfc-schel-fssf40b-micro-fuse-5x20mm-4a-250v-fast-acting-10-pieces 2026-07-05