Voltage and power ratings for the BOM
The 1.5KE13CA-B: With a 12.4V minimum breakdown voltage and 11.1V standoff, this part protects 12V nominal rails — the clamping at 18.2V keeps transients below the downstream device's abs-max rating. The 1500W peak pulse capability at 10/1000µs means it absorbs high-energy surges like load-dump or lightning-induced transients without failing short. Bidirectional construction (single channel) suits AC signal lines or DC rails where polarity reversal is possible.