The Leutron PowerPro 385030 PP BCD TNS 25/100/FM-350 is a genuine Leutron Type 1+2 / Class B+C surge arrester designed for robust overvoltage protection in TNS systems. This 4-pole device features a nominal discharge current (In) of 25 kA and a maximum discharge current (Imax) of 100 kA, ensuring comprehensive protection against transient surges. With a maximum continuous operating voltage (Uc) of 350 V and a protection level (Up) of less than 1.5 kV, it safeguards sensitive electronic equipment. An integrated potential-free remote signaling contact (FM) allows for continuous monitoring of the device's operational status. It is designed for DIN rail mounting and operates reliably in temperatures from -40 °C to +80 °C.