An auxiliary power port such as is found in an automotive vehicle passenger compartment has a receptacle connected with the vehicle electrical system and a sleeve rotatably mounted in the receptacle to receive a standard adapter plug of the type intended for use with automotive power ports. The sleeve is insulatively spaced from the inner surface of the receptacle, and includes at least one and preferably multiple PTC elements conductively sandwiched between the sleeve and the receptacle. The PTC elements are rotatable into and out of a non-conductive window in the receptacle to selectively adjust the overcurrent protection level provided by the power port, and to disconnect the PTC elements from current to allow them to reset after being tripped by overcurrent.