The BT148-600R127 is a device from WeEn Semiconductors, a global provider of semiconductor solutions. The BT148-600R127 is a 600V, 0.4A, 4-pin plastic-encapsulated SCR (Silicon Controlled Rectifier) in a TO-220AB package. It features blocked voltage up to 1200V, surge current up to 2.5A, and over-temperature protection. It is suitable for applications in telecommunications, home appliances, electric motors, and power supplies. The device is RoHS compliant and lead free.