What the 1500W rating means for the BOM
The 1.5KE51AHE3_A/D: The 70.1 V maximum clamping voltage at 21.4 A peak pulse current means the protected rail sees no more than 70.1 V during a transient — critical for downstream 48 V bus components that must survive load-dump or inductive kickback without secondary clamping. For an under-hood ECU or a 48 V mild-hybrid bus clamp, the temperature margin is the deciding factor — the 175 °C limit covers hot-soak conditions that commercial-grade TVS diodes cannot.