Fischer elektronik cool rail 32mm h heat sinks fischer elektronik sk 76 50 sa the fischer elektronik 42 cool rail 50 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 50 sa cool rail sk 7650 sa heat sink 42cw