The 1.5KE480A: For a 480 V nominal line, the 408 V reverse standoff (working voltage) sits below the rail with margin, meaning the diode stays off during normal operation and only conducts when a surge pushes the line above the breakdown threshold. In a 400 VAC three-phase rectified bus, the DC rail sits around 565 V, which exceeds the 408 V standoff; this part is better suited for single-phase 240 VAC or 277 VAC lines where the DC bus stays under 400 V.
Through-hole DO-201 package and thermal reach
The DO-201AA (DO-27) axial-lead package is a through-hole form factor with a large copper slug inside the epoxy body that spreads heat from the junction to the leads. Because it is a single unidirectional channel, the cathode band must face the positive rail. Power line protection is marked as 'No' in the spec — this is a data-line or DC-bus TVS, not a mains AC line protector. The tape-and-reel or cut-tape packaging options suit both prototype hand-assembly and production wave-solder runs.
Active production and sourcing posture
The DO-201 package is common across the 1.5KE series, so a reel or cut-tape quantity is straightforward to procure.