Siemens 3ZX1012-0LD20-1AT1 is a knob-only accessory for the 3LD2 main switch (Hauptschalter), used to manually operate the switch in Siemens low-voltage control panels. It is listed as an NC-range accessory with the alternative reference 3ZX10120LD201AT1 and the official order number 3ZX1012-0LD20-1AT1. Supplied as the knob component only and designed for mounting with the 3LD20 family, this part provides a reliable grab-and-turn control for main/emergency-off configurations without including the switch housing or other components.
