A novel behavioral model of direct current (DC) solid state power controller (SSPC) is proposed in this paper, which is suitable for simulation of large aircraft power distribution systems. A dependent voltage source is employed in this model to achieve slow switching on and off by controlling the linearity of the voltage drop across the SSPC. Taking into consideration the leakage current, improvements are made on the SSPC behavioral model by analyzing its steady on and steady off states. Switching on and off dynamics of the proposed model with different kinds of load is studied. This model is implemented in Saber software and the compatibility for different kinds of load is validated by simulation and experimental results. Speed test results show that the proposed behavioral model is much faster and possesses better convergence property as compared with the model based on real structure and components.