1k HPS ballast is 2.3 amps, & I can't remember if operating or starting current is higher.
Some locations have midget fuses in in-line fuse holders at the base; one set of poles has a fuse block (finger safe, Bussman) in the base.
My guess 3 amp, time delay.
A good place to get great info is Bussman.com; drop an e-mail to one of the fuseoligists.
John
