I may be unfair with 4 stars here as I did this because for a 150A unit the terminals are only #10 size. For such currents and large cable lugs on large cables, these small terminals are not suitable for me. I think for the audio world this might be ok, but I use this to protect two deep cycle batteries in series. I love the fact that you can open the device with a light press of a button and the reset lever easily folds back into the closed position.