The PMRU phase monitoring relays utilize microprocessor-based design to protect against phase loss, reversal, unbalance, undervoltage and overvoltage conditions.The PMRR series provides protection against phase reversal, while the PMRRL series protects against phase loss, reversal and undervoltage. AR series alternating relays feature a three-position selector switch to alternate 2 loads as normal, or lock the relay to one load or the other. PSFR series pump seal failure relays monitor the shaft seals of submersible pumps. Featuring a user-adjustable sensitivity knob, the relays are available in 2 8-pin models: SPDT single channel or dual channel relay with two SPNO contacts.
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