Obsolete 1500W TransZorb — sourcing through independent channels
The 1.5KE47-E3/54: The Vishay 1.5KE47-/54 is a 1500W unidirectional TransZorb® TVS diode in a through-hole DO-201AA/DO-27 axial package.
Protection window: 38.1V standoff, 67.8V clamp at 22.1A
That 67.8V clamp is the hard ceiling the downstream circuitry must survive.
Single-channel unidirectional — no AC mains protection
This is a single unidirectional channel (one diode per package), so it protects one signal or power rail against positive transients relative to ground. The 'Power Line Protection: No' flag means it is not designed for continuous AC mains clamping — use it on DC buses, not 120/240VAC inputs.