wohhomWOHHOM 300 Amp Circuit Breaker DC 12V -48V Waterproof 30A-300A Manual Reset Fuse Inverter for Trolling Motor Auto Car RV Marine Boat Current Overload Protection (300A)

Does it's job. Easy to install

Worked great!

Used in my camper inverter circuit. Works great

I put this between my battery and my heavy duty winch. That way if there is a short circuit or the winch stalls for too long, I should not melt either cables, or the battery post. I do NOT expect this small circuit breaker to work like a $1000+ industrial part. It probably will not carry excessively high inrush, or even rated full load current continuously, so size it bigger than you need, but small enough to save your wiring. I also would not use it as a load controller switch. I shut it off when I work on the winch, but I do not shut it off while it is carrying a substantial load current. I would not reset it to "on" with a load connected either. It is the contactors job to make and break the load current.

Robust construction and advanced protection mechanisms, it ensures the safe and smooth operation of circuits, effectively preventing overloads and short circuits. The breaker's easy installation and user-friendly design make it a top choice for professionals and DIY enthusiasts alike.

I purchased this breaker for a power inverter setup.SETUP: 4 x 100 Ah LiFePo batteries, connected in parallel using 2 gauge copper wire, creating a 12.8 volt 400 Ah battery bank. Each of the four batteries is also independently connected to the 300 amp breaker using 2 gauge copper wire (2 gauge x 4 is equivalent to 0/1 gauge) and then to the power inverter. Total all wire distance ~3.5 feet.TEST: I connected a test load to the power inverter (space heater) and a voltage meter to the positive and negative battery terminals of the power inverter.RESULTS: After about 2 minutes the breaker cuts out without tripping. After a few seconds the breaker resets itself, then proceeds to cuts out and reset itself about every 20-30 seconds thereafter. The circuit breaker remains un-tripped. Using a voltage/amp/wattage/hz meter I determined the load was 112 volts, 59 hz, and varied between 1600-1700 watts.1700 watts / 0.85 efficiency = 2000 watts2000 watts / 12 volts = 167 amps1 gauge copper wire equivalent is sufficient. 0/1 gauge copper wire equivalent used to ensure reduced heat caused by resistance.CONCLUSION: This 300 amp breaker is cutting out at ~167 amps and is not a good choice for sustained power draw.

Well，this is an amazing quality with its price , standed the test of time! working excellent so far !! i bought circuir breaker 3 units from other sellers for my boat battery system , but unfortuanely, one is broken when i got it , the second one met trouble of leakage current when it on the off position , while switch of the third one jump out after working about 1 month , only for this the one from wohhom , i press it repeatedly many times per day but still good working ,Really greatly recommend to buy !!

I bought this 125a fuse because it was recommended size for my master fuse block. I’m using this for a teardrop camper deep cycle battery that will be powering all the electronics. I love this breaker because I don’t need a separate master on/off switch. I just press the button and it cuts all power. Very easy to install and use and so affordable.

These are 70amp breakers rebranded as 300. At 75amp they get too hot to touch, will be a fire risk.Tiny terminals, bad hardware. BEWARE