A modular clamp for storing a spear gun or other items on a marine vessel comprising a fixed clamp arm and a pivoting movable clamp arm, wherein the fixed clamp arm and the pivoting movable clamp arm define an openable clamp releasably receiving one or more items. This is achieved by dividing the functions of the fusible link, the load current switch, and the short-circuit switch into in parallel arranged T-sections, each of which is designed for only a fraction of the nominal load so that each of the easily integrated fuse segments carry only the respective fraction of the nominal current. A connectivity matrix is defined on the initial directed graph that is modified in an iterative process.