Eaton is a highly trusted brand internationally in the electrical and industrial/heavy equipment industries, which is why we choose this EV HV fuse. These fuses are from their Electric Vehicle line. Rated at 500VDC maximum.

As a rough guideline:

It's best to choose the 400A fuse if you are using a 500A controller, and the 500A fuse if using a 750-1000A controller.