1500 W peak pulse — the clamping decision
The 1.5KE110A-E3/54: The 9.9 A peak pulse current rating tells you the surge it can shunt before the junction exceeds its thermal limit. The 105 V minimum breakdown voltage gives a 11 V margin above the standoff — enough headroom to avoid nuisance clamping on normal line ripple while still catching fast overvoltage events.
Through-hole axial — board-fit constraints
Housed in a DO-201AA (DO-27) axial-lead package, it mounts through-hole and suits point-to-point wiring or PCB layouts where the leads are formed and soldered. The 1.5KE supplier device package footprint is standard across the series, so the hole pattern and lead spacing match other 1.5KE parts.
Temperature range and unidirectional protection
The single unidirectional channel protects one rail against positive transients; for bidirectional clamping on AC lines or bipolar supplies, two devices back-to-back or a bidirectional variant is needed.