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Top rated phase monitoring relays

AI-generated summary · updated July 27, 2026 · verify details before purchase.

  1. Best overall

    Omron K8AK-PH Phase Loss/Phase Sequence Relay

    4.5/5 $60-$80

    Reliable phase monitoring with adjustable voltage range, widely used in industrial settings.

    • Highly durable
    • Easy to wire
    • Adjustable settings
    • Slightly bulky
    • No phase imbalance detection
  2. Best value

    Eaton RMQ-Titan Phase Monitoring Relay (280-500V AC)

    4.3/5 $40-$55

    Compact design with phase loss and sequence protection, ideal for motor protection.

    • Compact size
    • Good price
    • Wide voltage range
    • LED indicator dim
    • Limited to basic protection
  3. Best for heavy-duty use

    Allen-Bradley 849-C Phase Monitor Relay

    4.6/5 $100-$130

    Robust industrial relay with phase loss, reversal, and imbalance detection.

    • High reliability
    • Comprehensive protection
    • Long lifespan
    • High price
    • Large footprint
  4. Best budget pick

    Macromatic TE Series Phase Monitoring Relay (THR-PLDU)

    4.4/5 $35-$50

    Affordable and compact relay for basic phase loss and sequence monitoring.

    • Low cost
    • Small size
    • Simple installation
    • No imbalance feature
    • Lower voltage rating
  5. Best premium

    Schneider Electric RM22TG20 Phase Control Relay

    4.5/5 $70-$90

    Advanced relay with adjustable thresholds and tripping delays for precise monitoring.

    • Adjustable settings
    • High accuracy
    • Good build quality
    • Higher cost
    • Complex setup
  6. Best for single-phase applications

    Omron K8AK-PW Phase Sequence and Loss Relay

    4.4/5 $55-$75

    Monitors phase sequence and loss for single-phase systems with compact DIN rail mount.

    • Compact
    • Works with single phase
    • Good value
    • Not for three-phase
    • Limited availability
  7. Best for advanced features

    Carlo Gavazzi DPA01CM44 Phase Monitoring Relay

    4.3/5 $65-$85

    Offers phase loss, sequence, imbalance, and under/overvoltage protection.

    • Multiple protections
    • Adjustable trip delay
    • Wide voltage range
    • Costly
    • Large size

Buying advice

When selecting a phase monitoring relay, consider the voltage range of your system, the types of faults you need to detect (phase loss, sequence, imbalance), and the mounting style (DIN rail vs. panel). Higher-end models offer adjustable settings and broader protection but come at a higher cost. For basic protection in small motors, budget relays work well; for critical industrial machinery, invest in a robust relay with comprehensive features.

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