ANJOSHI 300Amp Waterproof Circuit Breaker 20A-300A with Manual Reset Inline Fuse Inverter for Car Rv Marine Automotive Stereo Audio Electronic System 12V-36VDC

The 1/4" terminal studs are, IMHO, too small for a 300 amp protection device. The 1/0 AWG battery cable I landed on said terminal studs has a 3/8" heavy lug, so it's a missmatch. Working so far but I haven't had any big current surges either. Would be 5-star item but for this "issue".

dear purchaser if you are planing to connect it to a device that takes more then 100A the breaker will open and you need to result it manual , so its a misleading the 300A. NOT recommended .

Works great

There is no way this thing is rated for 300 amps. There isnt enough material on the bolts to withstand that much current. I am not even going to risk attaching this to my solar system.