Socket insert, color: pearl white, protective contact sockets 16 A 250V AC. Sockets with plug-in terminal can be retrofitted with overvoltage protection module as fine device protection. for flush-mounted installation, protection class IP 20, screw terminals, clamping range for copper conductors 1.5 mm and 2.5 mm, for the secure connection of aluminum conductors 2.5 mm without pretreatment.