By applying a forward-biased voltage to this triac L6004L6 thyristor manufactured from Littelfuse the bistable switch will continue to stay on. This device has a surge current rating of 40 A. This SCR thyristor has an operating temperature range of -40 °C to 110 °C. Its repetitive peak forward blocking voltage is 600 V, while its repetitive peak reverse voltage is 600 V.