Plasma initiation is an advanced initiating technique that ensures intrinsic safety and high reliability of the initiator, small-scale bridge foils is a promising energy exchange element for future low energy plasma initiating device. The thermal-electrical performance of small-scale copper bridge foils was simulated using finite element method. Results show that higher temperature acceleration occurs at the corners of the bridge, and then the generated ohmic heat will diffuse all over the bridge. While the energy excitation is identical, the time to melt temperature at the center of the bridge will decrease as the bridge width decreases. Furthermore, when the period of the pulse current remains constant, time to melt temperature will increase as the charge voltage decreases till the bridge cannot reach melt temperature.