This is the live count of currently active alarm conditions classified as major severity, the more urgent counterpart to tsiNbMinorAlarm, and typically the count that a monitoring system's paging or escalation policy is tied to for this power system. Major alarms on a power system generally indicate a real risk to load, lost redundancy, a failed module, or a degraded battery string, warranting immediate attention rather than the routine-review treatment given to minor alarms. An admin's on-call paging rule for this system would almost certainly trigger the moment this value transitions from 0 to any nonzero count.