Fischer elektronik cool rail 32mm h heat sinks fischer elektronik sk 75 50 sa the fischer elektronik 45 cool rail 50 x 32 x 14mm 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 75 50 sa cool rail 50 x 32 x 14mm heat sink 45cw