What the ratings mean on a dead board
The 1.5KE24C-E3/54: The 19.4V reverse standoff means it sits across a 19V or lower DC rail without conducting; when a surge hits, it clamps at 34.7V max and shunts up to 43.2A away from the load. That 1500W rating is the energy it absorbs in a single pulse — enough for a typical industrial transient or an inductive kickback event on a 24V bus. Bidirectional construction (one channel) means it protects both polarities in a single package — useful on AC-coupled lines or where the surge polarity is unknown.
Vishay lists this part as Obsolete. For a repair bench or a legacy BOM, the path is surplus or independent distribution — we source it against an RFQ, confirming availability and current pricing at quote time. The DO-201AA axial footprint is shared by many 1.5KE-family parts, so a pin-compatible replacement from the same series may exist, but no specific cross-reference is documented here.