OBSIDIAN CONTROL SYSTEMS NX4 Installation Manual page 12

3. Using a 4mm flat screw-driver, open the fuse holder with a quarter clockwise turn to pull the fuse
holder out of its socket. See compliance label at the bottom of the controller for replacement fuse
size. To close the fuse holder, press the fuse holder back in the socket and turn a quarter turn
clockwise until closed.
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