Looks like a pull out fuse Block. You have to pull the block out to find the Amps. You will typically see 1 or 2 cartridge fuses behind the block. You do not add them together to get the total amps. I see this typically on older 60 amp fuse panels. One cartridge is the main and the other for the range. By the way when you pull the block it will cut power to whole house so make sure this is OK first. Computers etc.

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Dave