The pluggable surge protection terminal blocks OVR SL offer combined protection, tested in category D, C, B (according to IEC/EN 61643), for twisted pair cables for signal transmission that require either a lower contact resistance, a higher current and/or a higher frequency range. They are suitable for direct current applications up to 750 mA and an operating voltage of 6 to 110 volts. For use at limits from LPZ 0 for protection against flashover up to LPZ 3 to protect sensitive electronic equipment.