4RCBM220SI30 is the replacement for part number 4RCBM220G30.
4RCBM220SI30 is RCD/MCB, 2 module, 2 Pole, 20A, 30mA, 10KA, C-Curve SI-type, super immune, A-type, surge current protected to 3000 A 8/20ms.
For further information, please refer to the below link:
https://www.clipsal.com/Trade/Products/ProductDetail?catno=4RCBM220SI30