FUS Shock-Safe Fuse Holder Schurter FUS Shock-Safe Fuse Holders offer high current/voltage ratings and IP67 rated protection. The FUS series is dust and water-proof, and suitable for harsh environments. These fuse holders are screw-type fuse carriers and meet the requirements of IEC 60335-1 for appliances in unattended use. This includes the enhanced requirements of glow wire tests accessories to IEC 60695-2-12 and -13.