What the 1500W rating means for your board
The 1.5KE200CAH: That 1500W figure is the maximum power the part can absorb in a single surge event — at the clamping voltage of 274V, the peak pulse current works out to 5.7A. For a 24V automotive bus, the 171V standoff means it sits across the rail without conducting during normal operation, then clamps transients above 190V breakdown.
Package and through-hole mounting
Housed in a DO-201AA (DO-27) axial-lead package, the 1.5KE200CAH is a through-hole part — it solders into a board with two leads, polarity marked by the cathode band (bidirectional so orientation doesn't matter for the clamping direction, but the band still identifies the part). The DO-201 package is standard for 1500W TVS diodes; the axial leads handle the surge current without trace lift-off if the PCB copper is sized for the pulse.