Surge rating and protection window
The 1.5KE130A A0G: That 8.7 A peak pulse current (Ipp) defines the surge it can clamp without failing — a direct fit for secondary protection on 111 V rails where the transient must be held below 179 V. The reverse standoff voltage of 111 V means the diode stays effectively open-circuit at normal line voltage; only when the transient exceeds the 124 V minimum breakdown threshold does it avalanche and clamp. The 179 V maximum clamp voltage at 8.7 A is the ceiling the downstream circuitry must survive.
Package and thermal reach
Housed in a DO-201AA (DO-27) axial-lead through-hole package, the part handles the 1500 W pulse without exceeding a 175 °C junction temperature. The wide -55 °C to 175 °C operating range means it can sit in an outdoor enclosure or near a hot power supply without derating the surge capability. The single unidirectional channel is polarity-sensitive — the cathode band marks the anode-to-ground orientation. No power line protection here; this is a signal or DC-rail clamp, not an AC mains suppressor.