The 1.5KE480C: The reverse standoff voltage is 408 V, meaning the diode stays out of conduction at normal line voltage up to that point; breakdown begins at 432 V min. This is a single bidirectional channel, so one device protects both polarities — useful on AC signal or power lines where the transient can swing either way.
Through-hole axial package, DO-201AA / DO-27 footprint. No power line protection feature — this is a general-purpose transient suppressor, not a dedicated rail clamp with foldback. The 1.5KE series uses a standard DO-201 outline, so the hole pattern and lead spacing match a wide range of existing PCB layouts.