Expansion/replacement module for QuickFlex sockets. The integrated surge protection module protects devices connected to the socket against voltage peaks in the network. The module also secures sockets located within a radius of 5 m in the same circuit. Includes visual and acoustic fault indicator: In the event of a surge the green control LED goes out and an acoustic signal sounds when the plug is plugged in. A central plate with lens is required for the visual display. Surge protection device in accordance with EN61643-11 type 3.