1500W clamp on a 16V rail — what the rating means
The SMCJ16CAE3/TR13 is a bidirectional Zener TVS diode rated for 1500W peak pulse power (10/1000µs waveform). At that pulse it clamps at 26V max while passing 57.7A — so a 16V supply rail sees the surge shunted before it reaches downstream silicon.
Bidirectional, 17.8V breakdown — single-channel clamp
One bidirectional channel: the device triggers symmetrically at 17.8V min breakdown and clamps to 26V. No power line protection — it is a signal or low-voltage bus protector, not a mains-side MOV.