These fuses are used for home solar systems. They protect the 7500w inverter and 880amp 24v battery pack. I looked at a few fuses and settled on these based on price and availability. They are well built and will withstand the stated currents. Setting the fuse to the maximum and higher proves that they work as advertised. They also have a simple viewing window to see an obviously blown fuse. Thanks Stinger and Revain.