The 1.5SMC27C: The 1500W peak pulse power rating defines the surge energy it can absorb without failing.
The Tape & Reel packaging suits automated pick-and-place, but reels from surplus channels should be inspected for moisture sensitivity and date code before the line runs.
Surface mount to a DO-214AB (SMC) footprint — the same land pattern used for the SMCJ suffix devices. The copper pad area under the cathode tab sets the thermal resistance for pulse dissipation. No power line protection — this is a signal-rail or low-voltage bus clamp, not a mains-side suppressor.