What the 1500W rating means on the bench
The 1.5KE250CA B0G: The reverse standoff voltage is 214 V, meaning the diode stays off below that level and only starts conducting when the transient pushes above the minimum breakdown of 237 V. That 23 V window between standoff and breakdown is the guard band for normal line ripple. Bidirectional — one channel handles both positive and negative going surges, so polarity doesn't matter when you solder it in. Useful on AC signal lines or DC rails where reverse transients are a risk.
Package and rework — DO-201 axial is a through-hole friendly footprint
DO-201AA (also known as DO-27) axial leaded package — the two wire leads come out opposite ends, so it sits flat on the board and the leads pass through plated holes. No hot-air rework needed; a standard soldering iron and desoldering wick or a solder sucker lifts it cleanly. The bulk packaging means you get loose parts, not tape-and-reel — fine for hand assembly or low-volume production.