Surge protector, and general thin Profibus to 12Mbit / s multiplex field, 5Vdc voltage, 450mA rated current, rated surge current 10kA / 20kA peak current (curves 8 / 20us) line resistance 2.2 ohms. Temperature range -40 ° C ... 85 °, IP20 IEC. PT-PB-3 ST. Phoenix Contact.