Combined surge protection, tested in category D, C, B (EN 61643), suitable for twisted pair cables for signal transmission. Available for nominal voltages of 6, 15, 30, 50 and 110 volts and rated currents up to 300mA. For use at limits from LPZ 0 for protection against flashover (typically at the point of cable entry) up to LPZ 3 to protect sensitive electronic equipment.