IMC Audio 80 Amp Audio Inline Circuit Breaker 12V w/ Manual Reset Fuse 4 6 8 Gauge for Car or Stereo

I used this in my engine compartment for an amp power wire and you can fit 4 gauge wire (max size) into it by removing the inserts. Nicer than the other breakers as it is more waterproof and also doesn't need connectors to hook onto. Not industrial strength made for abuse, but the plastic will hold up well in vehicles. Works well for what it is and does its job.