Xtenzi 300A Car Audio Inline Circuit Breaker (12V-24V DC) Prevents excessive current and stops power surges from damaging Amps Features self-test and manual override and easy to operate with manual reset arm High Tech water resistant housing with rubber boots for water protection Fits cables from 4mm to 10mm in diameter and accepts 2/ 4 / 6 /8 AWG Compatible with any 12V-24V DC battery