The BT137S-600D,118 is a two-way thyristor (TRIAC) manufactured by WeEn Semiconductor. This device is a 600V TO-252-3 RoHS compliant component. It is designed to be a low-power, three-terminal switching device that enables the control of load currents in the AC mains. It is suitable for both industrial and domestic applications and provides reliable overcurrent and thermal protection. It can be used in consumer items like wall-mounted dimmers, HVAC systems, lighting, and motor control applications. The device is also suitable for use in various other applications, including industrial automation and gate control for medium voltage supplies.