These circuit breakers don't look shiny or pretty. I've tried 30A and 60A switches and neither of them will work. I've run 85 amps at 12 volts (about 1100 watts) through them for over a minute and none of them will work! Current regulator with 500A shunt for current measurement. I don't want to test higher current as it could start a fire in my house. Don't buy this imported junk