Wieland selos bit tier installation din blocks wki 4 26a grey wieland 5640494550 wielands grey selos tier din block wki 4 n d sl is an installation terminal block with screw connection for mounting onto a ts 35 din rail equipped with a 26a current rating and 400v voltage rating this well designed block offers clear circuit identification and remains easy to wire valid for fine stranded wires with a cross section of 05 4mmsup2 along with solidstranded wires with a cross section of