BT137S-600F,118 is a NXP Thyristors in a TO-220AB package with a 600V, 37A current rating. It is a fast-switching, low to medium power switching thyristor designed to provide solid state switching for power control applications. It features a low leakage current and is capable of withstanding overvoltages in excess of its rated voltage. The device is also UL recognized, CSA approved, and RoHS compliant.