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ION 73xx, 75xx/76xx, 8xxx: Power Supply Fuses

Old installation guides show a fuse of 2A to protect the power supply, while the latest guides show a fuse value of 3A. 

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Circuit Protection

The function of the external fuse is to protect the power source in case of a short circuit in the wiring between the source and meter terminals. ION meters have an internal 2A fuse. The power supply fuse rating in the installation guide was changed to 3A in order to provide better fuse coordination, that is, in the event of a fault happening in the meter, we would like to prevent the fault in the meter from blowing an upstream fuse and cutting the power supply to other devices and circuits.
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