NAI's AC and DC Powered Frequency Monitors are used for applications where electrical systems must be de-energized or alarm devices must be activated when the line frequency departs from acceptable operating limits.
The FAA and FQA are AC Powered Frequency Monitors used to de-energize or activate alarm devices when the line frequency departs from... More...
The FAD and FQD are DC Powered Frequency Monitors used to de-energize or activate alarm devices when the line frequency departs from... More...