This scr TYN412RG thyristor manufactured from STMicroelectronics is a bistable switch, it will conduct when there is a current trigger and continue to be on when there is a forward bias voltage applied to it. This device has a surge current rating of 125 A. In order to ensure parts aren"t damaged by bulk packaging, this product comes in tube packaging to add a little more protection by storing the loose parts in an outer tube. This SCR thyristor has an operating temperature range of -40 °C to 125 °C. Its repetitive peak forward blocking voltage is 400 V, while its repetitive peak reverse voltage is 400 V.