3RT1975-5AV31

3RT1975-5AV31 is a replaceable operating coil used in Siemens SIRIUS S12 frame-mounted large contactors (corresponding to the 3RT107, 3RT127, and 3RT147 series). It has a rated voltage of 380-420V and can operate on 50Hz and 60Hz AC power supplies or corresponding DC power supplies. This voltage range is commonly found in production line control power supplies using 380/400V three-phase systems. When the field control voltage falls within this range, and the original coil fails due to overheating from prolonged energization or inter-turn short circuits, this part number can be used for direct replacement without altering the rest of the contactor's structure.