Fischer elektronik heat sinks 29 x 11m w x h fischer elektronik sk 09 37 5 sa the fischer elektronik 86 heat sink sk 09 375 sa has been specially developed for power transistors with an extruded design the effective heat dissipation makes it ideal for a wide range of applications fischer elektronik sk 09 37 5 sa cool rail 29 x 115 x 375mm heat sink 86cw