ESO 10.3x38mm Fuse Inserter/Extractor Schurter ESO 10.3x38mm Fuse Inserter/Extractor with Cover Function can be used simultaneously as an inserter, extractor and cover for fuses on PCBs. Designed for use with SCHURTER's CSO fuse clips, and the ASO 10.3x38 fuse, the combination provides touch-safe circuit protection up to 1500VDC.