Review on STETION 200 Amp Circuit Breaker Trolling With Manual Reset Car Marine Trolling Motors Boat ATV Manual Power Protect For Audio System Fuse 12V-48VDC Waterproof (200Amp) … by Brian Page

I bought a 250A breaker and tried to use a breaker between the battery and the inverter. These switches are either fake or a cheap, untested copy of a real marine DC switch. The breaker has a very high series resistance of 1.6 mΩ, which means that it will light up immediately when 250 amps flow through it (due to 157 watts of power dissipation). The calculated trip point at 20 amps DC test current was 33 amps. If designed correctly, the circuit breaker should trip after a few minutes when the nominal tripping current is applied. These switches may be OK if the trip current is less than 60A and the switch was actually calibrated when it was manufactured. Such circuit breakers are easily damaged (and spot welded) when the circuit breaker between the battery and the inverter (or power amplifier) is closed due to the excessive inrush current caused by the capacitor bank in the inverter (or amplifier). I recommend temporarily connecting the light bulb through a breaker until the input power of the inverter reaches the battery voltage, and then closing the circuit breaker.