The 1.5KE200A-G: Reverse standoff is 171 V, meaning the device stays transparent to the protected line up to that voltage and only starts conducting above the 190 V breakdown threshold.
DO-201 axial footprint and through-hole assembly
Housed in a DO-201AA / DO-27 axial leaded package (supplier device package DO-201), the 1.5KE200A-G is a through-hole part intended for wave-solder or hand-solder assembly. The axial body suits point-to-point wiring or PCB mounting where the leads are bent to the hole pattern — the 1500 W pulse rating assumes the full lead length is soldered to a copper trace that can sink the transient heat. Operating temperature range is -55°C to 150°C junction, which covers industrial and some automotive under-hood environments. No power line protection feature is listed — this is a standard TVS for signal or low-power DC rails, not for mains AC clamping.