This is the hard-failure counterpart to uchasPSUWarningTrapEna, chassis-wide controlling whether a trap fires specifically when a power supply has actually failed and been automatically shut down due to a protective condition like overvoltage or overcurrent. An admin treats this as one of the highest-priority traps to have enabled in this whole MIB, since a PSU auto-shutdown in a chassis without full redundancy directly threatens total chassis power loss, unlike the softer warning trap which just flags drift. For example, an admin who left this disabled might only discover a PSU auto-shutdown when the whole chassis unexpectedly goes dark on a non-redundant power configuration, whereas enabling it would have paged them the moment the protective shutdown occurred.