I bought these as a spare for one in my camper van. I blew up three of them on short notice and started investigating what was going on. Long story short I had to remove this item and replace it with a 'proper' fuse rated to work with a 3000w inverter/charger. Since then I do not have problems anymore. They just didn't fit the job I asked them to do. I can't comment on their quality as they just didn't work in my application. If you are looking for a fuse to protect your large inverter/charger in your RV this is not it.
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