Catalog > Consumer Electronics > Security & Alarms > Alarms > Alarm Systems Catalog > Consumer Electronics > Security & Alarms > IDS Alarms Proxnet Surge Protection Unit Proxnet Protection Unit Surge IDS 870-699-20 PROXNET SURGE PROTECTION UNIT Discontinued Specifications, Prices & Availability may change without notice. Images are for illustration purposes only. E&OE Overview The ProxNet Surge Protector is designed to be installed between the ProxNet RS-485 network and ProxNet devices (readers, repeaters, etc) to protect the device(s) from harmful induced voltage spikes and current surges. These transient voltages and currents are caused by lightning strikes in the area and switching conditions on cables running adjacent to the ProxNet wiring.