I have had this installed about a week now and it is working fine. I bought this item to allow me to cut the power to the system and be able to pull the amps & sub box out to allow for more room in trunk when traveling. I would recommend this product.

This thing is great! I used to pop fuses like asprin, but haven't popped this one once!
Iim running a 2400 and 1500 watt amp under this single fuse, crank it as loud as you woant it wont blow!

I put this in my system and I haven't had any problems with it. However, the plastic holes for screws I think were a little on the cheap side. I broke one trying to screw it into my seatback. I had cut the other one off and then mount it with JBWeld to some aluminum and then mount that. Other than that, I'm glad I have it just in case. It's its own insurance for your amps (I run two off of it).

A versatile utility, but I wouldn't use it to replace regular fuses. I use it as a manual on/off switch for my system and it works just fine (and hasn't gone out yet - I've been afraid the constant flicking off and on might wear it out).

I do want to note that even though it says 4 gauge, it doesn't really accept 4 gauge all that well (at least, true 4 gauge). You will have to shave some of the line off to get 4 gauge to fit in there.

Cool little product. Built a little on the cheap side, you have to be carefull on how hard you tighten the mounting screws. Great deal