What voltage of surge protection should be used on inputs, outputs, readers, and communications circuits?

Input circuits: minimum working/service voltage: 12 volts
Output circuits (switching DC): minimum working/service voltage: 30 volts
Reader data lines: minimum working/service voltage: 5 volts
Reader power: minimum working/service voltage: as required by reader
RS-485 communication: minimum working/service voltage: ±7 volts
Ethernet (non PoE): minimum working/service voltage: 5 volts
PoE: minimum working/service voltage: 60 volts

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