Sks hirschmann 4mm seb 2610 f48 safety sockets 1000v 25a cat iii sks hirschmann 935 980 458 grey sks hirschmann seb 2610 4mm built in safety socket with 48 x 08 spade connector for installation into switch panels and equipment chassis with wall thicknesses up to 6mm sks hirschmann 935 980 458 4mm safety seb 2610 f4 8 socket 25a cat iii grey