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Macromatic Isolated Output 3 Phase Monitor Relay Competitive Comparison THREE-PHASE POWER MONITORING Macromatic Isolated Output 3 Phase Monitor Relay ComparisonCompare Macromatic PJPU-FA8X and PMPU-FA8X with MPE 001-DVM-118-U and 001-DVM-118-OV phase monitor relays. Review protection thresholds, response times and isolated output ratings for motor control panels and alarm circuits. Both Macromatic models use True RMS voltage sensing and retain fault indication during phase loss. The key choice is fault response: PJPU-FA8X indicates phase unbalance without tripping; PMPU-FA8X adds unbalance tripping and overvoltage protection.
100 ms
Phase loss / reversal
Macromatic dropout response
2 seconds
Restart delay
At power-up and after fault correction
3.0 inches
Macromatic relay height
Compared with 3.75 inches for MPE Choose the Macromatic model for your applicationMacromatic PJPU-FA8XChoose this model when phase loss, phase reversal and undervoltage should trip the relay, but 6% phase unbalance should provide an indication only. It does not include overvoltage protection. Shop PJPU-FA8X →Macromatic PMPU-FA8XChoose this model when the relay must also trip for phase unbalance and overvoltage. Its fixed overvoltage threshold is 10% above the line voltage setting. Shop PMPU-FA8X →Isolated output phase monitor relay specificationsValues apply to both models in each column unless a model is specified. Voltage percentages refer to the selected nominal line voltage.
Before selecting a replacement: Check the voltage dial scale, socket wiring, contact load rating and required fault response. A shared 8-pin base does not establish interchangeability. Macromatic applications above 300 V require a 600 V-rated socket, such as 70169-D. What the differences mean for your control panelFaster response to phase faults. Macromatic's 0.1-second phase loss and reversal delay is one-tenth of the listed MPE delay. Evaluate the response time alongside the protection requirements of the connected equipment. Less relay height. The Macromatic housing is 0.75 inch shorter. Allows additional space for the socket, wiring and installation clearance. Separate alarm contact. The SPDT + SPNO configuration provides an isolated contact for an alarm circuit. Compare the complete wiring diagram and load category; the MPE 10 A resistive rating and Macromatic horsepower or pilot-duty ratings describe different loads. Common selection questionsDoes PJPU-FA8X trip on phase unbalance?No. It indicates a 6% unbalance condition without tripping. Choose PMPU-FA8X when phase unbalance must de-energize the relay. Which model includes overvoltage protection?PMPU-FA8X trips at 10% above the selected line voltage, with a 4-second overvoltage dropout delay. PJPU-FA8X does not provide overvoltage protection. Does phase loss stop Macromatic fault monitoring?These models continue voltage monitoring and retain fault indication during a lost phase. This allows the fault condition to remain visible during troubleshooting. Need help matching a phase monitor relay?Email your existing part number, system voltage and required fault response to [email protected]. Last reviewed September 21, 2026. Verify the exact relay specifications on the product page before ordering. |
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