What the 1500W rating means for your rail
The 1.5KE220A: That 1500W figure is the peak power the part can absorb in a single surge event — it is not continuous dissipation. For a 185V rail, the device starts conducting at 209V minimum breakdown and hard-clamps at 328V maximum, shunting up to 4.6A of surge current away from the downstream circuitry.
Board-fit and rework considerations
Housed in a DO-201AA (DO-27) axial leaded package, this is a through-hole part. The axial leads are robust — they handle the thermal cycling of wave solder without issue. If you are hand-soldering a replacement on a rework bench, the body is large enough to grip with standard tweezers, and the cathode band is clearly marked. The 175°C maximum junction temperature gives good margin for the soldering iron tip; just keep the dwell under 5 seconds at 350°C to avoid cooking the die. The wide junction temperature rating means the leakage current at 85°C ambient is still manageable — the part does not thermally run away under normal bias.