Peak pulse power and clamping — what the ratings mean for a line-side TVS
The 1.5KE350A R0G: That 1500W rating means it can absorb a transient of that energy without failing — useful for clamping surges on a 300V nominal DC rail where the steady-state voltage sits below the 300V reverse standoff. The 482V clamp is the ceiling the downstream components see — if your circuit's absolute max rating is below that, this part won't protect it.
Package and field-replaceability — DO-201 axial, through-hole
Housed in a DO-201AA (DO-27) axial leaded package, the 1.5KE350A R0G is a through-hole part. The axial leads make it a straightforward swap on a board — no hot-air station, no reflow profile. Polarity is marked by the cathode band; orientation is obvious enough to get right with a multimeter in the field.