Sks hirschmann 4mm safety seb 2600 sockets 1000v 32a cat iii sks hirschmann 935 980 454 grey sks hirschmann seb 2600 g m4 built in safety socket designed for installation into switch panels and equipment chassis with wall thicknesses up to 6mm sks hirschmann 935 980 454 4mm safety seb 2600 g m4 socket 32a cat iii grey