The fused string ground for Taylor Expression System® electronics and electric guitars features a fuse that’s designed to blow in the event of improper electrical ground, in order to protect the player. If the fuse blows, the guitar’s electronics will continue to work, but the strings will no longer be grounded, and the guitar could be more susceptible to electrical hum, so a replacement should be installed. Replacement fuses are compatible with all Taylor fused string grounds, as well as the Taylor universal string ground, designed for other electric guitar brands.