Summary

Recommendation ITU-T K.140 describes the types, construction, operation and selection of fuses used in information and communication technology (ICT) and alternating current (AC) powering equipment ports. Series connected fuses and fusible components operate by the fusing of one or more of their elements which opens a connected circuit by breaking the current when it exceeds a given value for a sufficient time. Fuses and fusible components are intended to prevent potential hazards caused by overcurrents. The two main equipment application areas are AC mains ports and ICT ports where AC mains incursion is possible. This Recommendation considers fuse and fusible component types, the electrical stress levels pre- and post-operation and gives circuit examples.