Why does my fuse keep blowing in my cigarette lighter when it exceeds the factory specs?

I bought a Satechi sound-fly AUX FM modulator, which plugs into my cigarette lighter. It includes a 500mA fuse and a replacement. Both of these blew out. I tried a 2 Amp and a 5 Amp. They blew out as well. I drive a 2003 Honda CR-V, and the lighter is 12V.

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