SwitchLine - contact units for OT load-switches Contact units for load-break switches (stock no. 686-7256 ) Auxiliary contacts Snap-on fastening on switch Max. load 16 A Protection system IP20 Main contact (4th pin) Dovetail fastening for type 32 A Snap-on fastening from type 63 A NO; function simultaneous with main contacts Kraus & Naimer All have a nominal voltage of 690V. The stated motor rating utilisation category AC23A/AC3 is for 3 phase 380/440V supply.