[Elecraft] Need a Fuse on the K3's Power Line?

[PGrig]

I was just looking at my new K3's (#7489) power cable, and see that it is not protected by a fuse (although I think I saw an instruction to use an in-line fuse if I connect it to battery power).  

I see what looks like a 20a fuse (or breaker) on the back of my K3/100, although I believe I read that it draws 25a  continuous duty.

I was thinking of connecting my radio either directly to a 70a Astron p.s. (which will also handle my 50w 2m mobile rig and a variety of other smaller loads) or through a 25a fused receptacle on a RigRunner, itself connected to the Astron.

To fuse or not to fuse--that is the question, and what is peoples' experience with the RigRunner?

   -Paul Grigorieff, N1HEL