Peak pulse power and clamping for 12V rails
The 1.5KE11AHB0G: The single unidirectional channel protects one line; for a 12 V automotive bus that sees load-dump or alternator-field decay transients, the clamping margin to the downstream IC's abs-max rating is the number to check against the powered-device datasheet.
Through-hole package and board integration
The through-hole body handles the thermal pulse of a 1500 W surge better than an equivalent SMD package because the leads conduct heat into the PCB copper and the air around the body.