red lion BT-6821-AT-AC User Manual page 19

All modems are equipped with protection for reversed polarity and power surges over 33 volts. The modems are
equipped with an internal 3 Amp fuse. When using the 4 pin Molex connector / power accessory cable supplied by
BlueTree Wireless, an extra 2 Amp fuse is also included (5600v2, 5800v2).