BULVACK 200 Amp Circuit Breaker with Manual Reset for Car Marine Trolling Motors Boat ATV Manual Power Protect for Audio System Fuse, 12V-36V DC

I use this for a lift gate for a truck to protect the wire and use as an on/off switch so power isn't run to the gate at all times. It can handle the 450 amp inrush when it spins up without issue.These act more as a "slo-blo" fuse rather than an instant off circuit breaker inside certain ranges. They will blow instantly but only if you go way up in amperage.First off, remember, these aren't a fuse, they are a circuit breaker and their tripping or lack there of come down to several factors, including but not limited to:1. Rated current2. Ambient temperature3. Tripping current4. Tipping time5. Tripping rangeAnd more factors than this. With a mild overload within the correct voltage range it can take an hour for these things to heat up and trip. Thus as I mentioned, the "slo-blo" type of thing. There is something called a circuit breaker trip curve and an instantaneous trip amperage. All of this factors in. When rated at 300 amp like these, they don't instantaneously trip at 301A or whatever. Why? Because what if you have an item you turn on and it pulls 450 amps like my Tommy lift for a second or two while a motor spins up. You'd be tripping it all the time and calling it a piece of crap.On higher end versions of DC Circuit breakers (Marine, Aerospace etc.) you can actually set the instantaneous trip.Look around and you might be able to find the trip curve for breakers like this and get some idea of how this one will work for you if you're worried about it.To make good use of these and build in a safety margin, up your wire size by 1 and you'll be sure not to burn anything. Your wire should always be able to handle way more than your trip setting. So if you need to pull 250 amps constant, and use a 300 amp version of these, remember they could run for an hour possibly at 300 amps before they got hot enough to trip, where as, say 500 amps, would trip it instantly.Size wire accordingly.I hope you found this helpful.

Good product I used the 300Amp breaker as a disconnect when storing my car. I installed the unit between the battery and + power wires.

En mi caso monté el disyuntor junto a la batería para alimentar una caja de fusibles adicional en la que de momento tengo conectados mis faros de niebla adicionales.Ha funcionado, no he tenido problemas y estoy tranquilo sabiendo que en caso de un corto tengo esta protección extra.Muy recomendable.

Perfect circuit breaker at half the price. Thank you!

Easy!