Interesting video, but it still doesn't answer the question of why Brymen installed an underrated SIBA 400mA fuse instead of a more appropriate 630mA one, in their 600mA range multimeter?
Fluke and Keysight use a 440mA fuse on the 600mA range, better ask them too.
That's been addressed in an earlier post.
Bussmann doesn't make a 600mA fuse for multimeters and thus Fluke and Keysight limit their range to 400mA, with some allowance above for a stated limited time.
The Fluke 87 V has a a range of 400mA only, with a specified limit of 400mA continuous and overload 600mA for 18 hours.
The Fluke 179 has a range of 400mA only, with a specified limit of 600 mA overload for 2 minutes maximum, 10 minutes rest.
The Brymen 786 should have a limited mA range of 400mA, not 600mA, to avoid heat damage to the meter.
Keysight: Current can be measured at 440 mA continuously, and > 440 mA to 600 mA for 20 hours maximum.
To avoid blowing the multimeter’s 440 mA fuse, use the terminal only if you are sure the current is less than 440 mA.