Wieland selos feed through din blocks wkwkn uv0 bluegrey wieland 5750400556 this blue selos feed through din block wk 4uv0 31a from wieland has been designed for efficient wiring and offers optimum handling reliable and maintenance free the smaller size makes it perfect in areas with limited space and is simple to connect wieland 5750400556 selos feed through din block wk 4 u v0 31a blue