Here is a nice midi fuse holder with 40 or 60 amp fuse for use in your higher powered 2wd robots.
The fuse should be installed on the positive line just after the battery.
Takes MIDI fuses
Suitable for use with 40/50/60/70/80 100+ amp midi fuses
Remember to calculate the fuse rating based on your lipo battery C rating, and choose a fuse lower than that but more than your stall/robot usage.
To calculate the fuse rating, take the maximum C value and multiply it by the number of amps delivered by that pack. A 3S 3000mah with a C rating of 45 will provide 45 x 3.0amps = 135 amps so a fuse rating of 100 or 80 will be fine.
That being said, I run my 2wd pusherbot on a 40 amp fuse. 20 amps blew out.
For lower powered bots that can run on, check out my blade fuse holders here: https://teamsc.co.uk/product/blade_holder/
Additional 40 and 60 amp midi fuses are also available,