What the key ratings mean for the board
The 1.5KE36A A0G: The 31 A peak pulse current at the 49.9 V clamp tells you the diode can absorb a substantial surge without failing short, but the actual clamp voltage on your rail will be lower if the surge current is less than the rated maximum. The 30.8 V reverse standoff is the DC working voltage: the diode draws negligible leakage below this point. Above 34.2 V (the minimum breakdown), it starts conducting and hard-clamps at 49.9 V. For a 36 V nominal bus that sees occasional spikes from inductive kickback or lightning-coupled surges, this part keeps the rail below 50 V. The DO-201AA axial leaded package is through-hole, which means it handles rework cycles well — the leads take the thermal stress before the die does, and the body is large enough to hand-solder without cooking the junction.