In single-storey structures, the localized collapse of the parts exposed to fire can be accepted when the overall stability of the building and the structural integrity of firewalls is well managed. One of the solutions to reach this aim is to use non-load-bearing firewall between independent structures to limit the fire propagation and to localize the collapse in the compartment. In this study, to guarantee the integrity of the firewall, innovative solution based on fusible links with aluminium bolt is used. Numerical model is developed to investigate the fire behaviour of this link solution in the frame of the European FISHWALL research project (RFSC funded project). The FE model is implemented in ANSYS code to perform the analysis of thermal and thermomechanical behaviour of the link. The aluminium bolts and the other components are modelled using the recommendations of Eurocodes 3 and 9. To validate the numerical model, its results are compared to those obtained from a full-scale test on a link exposed to ISO fire curve. The model shows its capacity to predict the temperatures in different parts of the specimen as well as the fire resistance and the failure mode of the link.