Patent ID: 7563115

Claim:
A plug-in power supply for supplying a consumer with a low voltage, the plug-in power supply comprising: a housing including a voltage transformer module for converting a mains voltage into a low voltage, a recess, a first spring contact and a second spring contact, both contacts electrically connected to the voltage transformer module and extending through a surface of the housing within the recess, and a first wall extending substantially perpendicular to the surface of the housing within the recess and surrounding the first spring contact on at least three sides, and a second wall extending substantially perpendicular to the surface of the housing within the recess and surrounding the second spring contact on at least three sides; and an exchangeable mains plug including a housing, a first mains plug pin and a second mains plug pin, both mains plug pins extending from the housing in a first direction and configured to connect the voltage transformer module to a mains socket, a first contact pin integral with the first mains plug pin and a second contact pin integral with the second mains plug pin, both contact pins extending from the housing in a second direction opposite the first direction, the first contact pin configured to make contact with the first spring contact and the second contact pin configured to make contact with the second spring contact when the exchangeable mains plug is positioned within the recess by a first motion substantially perpendicular to the recess and a second motion substantially perpendicular to the first motion.