What the clamping voltage tells you about the protected rail
The 1.5KE11CA B0G: That 15.6V ceiling tells the downstream circuit what the worst-case spike will be clamped to — the protected load must survive that level without damage. Peak pulse power is 1500W (1.5kW). For a given transient energy, the clamping voltage and pulse current product must stay under this rating; the 100A figure at 15.6V already uses the full power budget.
Temperature grade and package fit for harsh environments
The wide band also gives headroom for self-heating during repetitive pulse events. Through-hole mounting suits designs where vibration resistance or manual rework is preferred; the axial leads handle the thermal expansion mismatch of the PCB better than a surface-mount part in high-temperature cycling.