What the 1.5SMCJ24CA does and what the numbers mean
The 1500 W peak pulse rating sets the energy absorption ceiling for a single 10/1000 µs event; if the board sees repetitive or longer-duration transients, derate accordingly.
Where this TVS series fits and what it protects
The 1.5SMCJ24CA sits on the 24 V power rail in general-purpose protection applications — industrial control, telecom power, and any DC bus that needs a defined clamp ceiling against lightning-induced or switching transients. Power-line protection is listed as no — this part protects the IC side of the rail, not the AC mains input.