It is of course possible that it is an industrial unit with a datasheet, and a specific rating of xxA continuous operation.
Or it might be what it looks like - an RCD made for intermittent use on extension cables, that you might get from a big box store, of rather indeterminate internal design quality, and using the kind of crimped and overmoulded plugs that have form for burning out when used continuously at rated current.
The key point is that the charger is an RCD - and in this type it is a high quality design. (I have opened multiple)
