It is also possible that the jack needs maintenance, lubrication. Also, if any additional weight was added to the trailer or the jack is trying to lift beyond its capacity, it can blow the fuse. The owners manual for the jack should include where and how to lubricate it.
If you run the jack all the way to the top or bottom their could be too much torque on motor, motor over draws power and fuse pops.
If you don't want to install a slow burn fuse, you can install a 30amp auto reset circuit breaker:
https://www.amazon.com/Fastronix-Aut...B1XTC9Mhttp://