Help identifying a varistor (on a shredder PCB)?
Your Varistor is a MYG-10K431.
The nomenclature that comes before the 'MYG', refers to the manufacturer, if I'm not mistaken.
The MYG-10K431 datasheet expose that:
Part Number Code: MYG-XXKXXX, wherein

MYG : Product Type [9/MYG]
XX  : Diameter     [05= 5mm; 07= 7mm; 10=10mm; 14=14mm; 20=20mm]
K   : Tolerance    [K: (+ or -) 10%]
XXXX: Voltage

So, I guess 9/MYG means the varistor type. Check the datasheet in the link bellow.
Source [DATASHEET]: https://datasheetspdf.com/pdf-file/1213341/ETC/MYG-10K431/1