An electrical power feed thru for thin-walled vessels such as aircraft fuselages is disclosed which allows high electrical current power lines, and their associated high operating temperatures, to transition from the inside to the outside of the aircraft. The feed thru includes sealing surfaces, anti-rotation features and safety covers. This low-profile configuration permits the attached cables to run close to the fuselage walls, permitting easier routing and clamping. The feed thru has a variable geometry which permits alternate spacing of the end terminations in reference to the fuselage while maintaining the same parts. Installation is simplified through a single fuselage wall mounting hole design that can be done with a standard punch. The feed thru exceeds the shock and vibration environments of various aircraft such as a military aircraft.