Fischer elektronik aluminium heat sink mount clip on horizontavertical bolt fischer elektronik fk 237 sa 220 h the fischer elektronik aluminium heat sink mount clip on 21cw to 220 a range of clip on heat sinks that are optimally designed for cooling to 220 devices available in horizontal vertical or a design suitable for both orientations a choice of thermal resistances ensures that together with the mounting choices there is a suitable heat sink for every application the he