NAI's AC and DC Powered Phase Monitors are used to protect Three Phase Loads from damage due to Phase Reversals or Phase Absence. Contacts may be used to disconnect the load or to operate alarm circuits or both. Upon application of power, the output relay energizes if all phases are connected and the phase sequence is ABC. If any phase becomes disconnected or if the phase rotation is abnormal, the relay immediately de-energizes.
The PAA and PLA are AC Powered Phase Sequence Monitors which protect Three Phase Loads from damage due to Phase Reversals or Phase... More...
The PAD and PLD are DC Powered Phase Sequence Monitors which protect Three Phase Loads from damage due to Phase Reversals or Phase... More...