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Phase monitoring relays: top picks

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Phase monitoring relays: top picks

AI-generated summary · updated July 31, 2026 · verify details before purchase.

  1. Omron K8AK-PH Phase Loss/Phase Sequence Relay
    Best overall Omron

    Omron K8AK-PH Phase Loss/Phase Sequence Relay

    4.5/5 $101.00 Only 3 left

    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
    View on Amazon manufacturer site
  2. Eaton RMQ-Titan Phase Monitoring Relay (280-500V AC)
    Best value

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

    4.3/5 $64.00 Only 2 left

    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
    View on Amazon manufacturer site
  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
    View on Amazon manufacturer site
  4. Macromatic TE Series Phase Monitoring Relay (THR-PLDU)
    Best budget pick Macromatic

    Macromatic TE Series Phase Monitoring Relay (THR-PLDU)

    4.4/5 $114.76

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

    • Low cost
    • Small size
    • Simple installation
    • No imbalance feature
    • Lower voltage rating
    View on Amazon manufacturer site
  5. Schneider Electric RM22TG20 Phase Control Relay
    Best premium Schneider Electric

    Schneider Electric RM22TG20 Phase Control Relay

    4.5/5 $84.00 Only 1 left

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

    • Adjustable settings
    • High accuracy
    • Good build quality
    • Higher cost
    • Complex setup
    View on Amazon manufacturer site
  6. Omron K8AK-PW Phase Sequence and Loss Relay
    Best for single-phase applications Omron

    Omron K8AK-PW Phase Sequence and Loss Relay

    4.4/5 $101.00 Only 3 left

    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
    View on Amazon manufacturer site
  7. Carlo Gavazzi DPA01CM44 Phase Monitoring Relay
    Best for advanced features CARLO GAVAZZI

    Carlo Gavazzi DPA01CM44 Phase Monitoring Relay

    4.3/5 $143.91

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

    • Multiple protections
    • Adjustable trip delay
    • Wide voltage range
    • Costly
    • Large size
    View on Amazon manufacturer site

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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