All of the fuses and most of the wire are missing. The fuses would have been in a transparent plastic piece which fitted into the rectangular hole in the lower section of the card.
5 Amp for light and small plug circuits. 15 Amp for large plug cirucits. 30 Amp for cooker and ring mains.
The back of the card describes the three ratings. All of these are still available, although the 5A fuse is rarely used.
This was also sold in Woolworths under the 'Winfield' brand - same reference number and layout.