150Amp Circuit Breaker 30-300A with Manual Reset Trolling Motor Auto Car Marine Boat Bike Audio Terminal Inline Fuse Inverter for System Current Overload Protection 12V-48V DC Waterproof

Cannot hold more then 100amps, which is alot of amps, but when it's rated for 350. Come on! The arm also broke internally and externally so yeah don't buy.

This is for the 150 amp version. Current causes a bimetalic element which is also an electrical contact to heat. As it heats the pressure on the contacts is reduced and arcing occurs before the breaker snaps open. With 150 amps applied, arcing started in 35 seconds and it tripped at 45 seconds. With 78 amps applied, arcing started in 270 seconds. When cold (at 78 amps) the voltage drop was 125 mv, just before arcing it was 250 mv. As a manual switch it seems good if the current is small enough, so a 300 amp breaker can probably be used at 100 amps as a reasonably priced switch. Seller offered me a $25 gift card to delete this review.

WARNING: Faulty design. The shoulder of the terminals is set below the surrounding plastic so a ring terminal doesn't contact it. Connection is only made through the washer, the nut, and the threaded terminal post.Poor connection will have voltage loss and heating at full capacity.

This thing is garbage. Resets constantly and not drawing anywhere near 300 amps. Can't use trash like this, most current draw was 240 and it even reset at 100a. If you are using this in a build that matters then RIP it out and send it back or put it in a dumpster otherwise it might cost you.