Fischer elektronik cool rail 32mm h heat sinks fischer elektronik sk 76 37 5 sa the fischer elektronik 65 cool rail 375 x 32 x 20mm heat sink has been specially developed for voltage regulators transistors thyristors triacs etc the effective heat dissipation make it ideal for a wide range of applications fischer elektronik sk 76 37 5 sa cool rail 375 x 32 x 20mm heat sink 65cw