Abstract: A solid state power switch assembly of an aircraft solid state power controller includes a circuit board, at least one solid state power switch, and a busbar. The at least one solid state power switch has a first side and an opposing second side. A power switch electric contact surface is formed on the first side and the at least one solid state power switch is arranged on the circuit board with the second side facing the circuit board and the first side facing away from the circuit board. The busbar comprises at least one busbar contact portion configured for electrically contacting the power switch electric contact surface and at least one busbar mounting portion, which is configured for be mounted to the circuit board, so that the at least one solid state power switch is sandwiched between the at least one busbar contact portion and the circuit board.