Design in accordance with IEC/EN 62019, screwless assembly, can be subsequently snapped onto PLS and PKNM, ZP-IHK, ZP-WHK: can also be snapped onto itself 1x piggyback, specified minimum voltages apply per switching distance. Attention for series connections!, contact material and design make it particularly suitable for low voltages, contact function with relative movement (self-cleaning contacts), ZP-NHK: function of one of the two changeover contacts can be switched from 'auxiliary switch' to 'trigger signal switch', trigger signal contact reports electrical triggering, test button for contact function 'electrical triggering'