Combined protection, tested in category D, C, B (EN 61643), suitable for 3-wire cables for signal transmission that require lower contact resistance, increased current and/or a wider frequency range. Also suitable for DC applications up to 0.5 A. Available for nominal voltages of 6, 15, 30, 50 and 110 volts. 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.