1500W peak pulse — the clamping ceiling
The 1.5SMC18A: That 1500 W rating means the device can absorb a transient of that energy without failing — the clamp voltage at that peak current is 25.2 V, and the peak current itself is 60.3 A. This is a classic secondary-protection part for DC power inputs, signal lines, or low-voltage bus clamping where a single unidirectional channel is enough.
DO-214AB SMC — footprint and bench fit
Power line protection is marked 'No' — this part is not intended for AC mains or high-energy direct power-line clamping. It is a transient suppressor for DC rails and signal-level interfaces, where the 1500 W pulse handles ESD, load-dump, or inductive kickback events.