Temank 40A Inline Circuit Breaker Reset Fuse, 12V-24V DC Reset Fuse Holder 40 amp with Manual Reset for Car Audio Stereo Switch and Solar Inverter System (2 Pack)

I use these all the time as a disconnect for the solar panel to the solar controller. As you know you must never have solar power coming into the solar controller if the battery is not connected. You can disstroy the controller if you do. I know, as I have made this fatal mistake, by mistake or ignorance. It can be costly. I use only MPPT controllers and they run around $150.00 and up. They also serve as a breaker for over power surges, for what ever reason. They are cheap insurance as well very hand when you need to disconnect the panel for any service work that must be performed. Always remember the breaker needs the be 10% larger than the current that the panels can produce. Solar is fun, let's be safe smart about it.

Work well with my solar system. Recommend.

I've been through countless versions of these and find the amperage capacity to be hit and miss as compared to the "rating". I bought these 40a breakers to replace a couple of 50a rated ones from another vendor that were tripping at 20a. They stay cooler and have not tripped at 20a. The voltage drop is also a bit less than the bad 50a rated breakers were showing. (Which makes sense, since heating of the bimetal element due to excess current flow is what trips this style breaker...)

Good quality works perfect for what I am using it for.

The first batch contained one that would trip back into place after it was manually switched to open. I was using these on a home-built generating station. I contacted Amazon and they sent out a replacement batch. No problems with the second two.