Top rated voltage monitoring relays

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AI-generated summary · updated July 28, 2026 · verify details before purchase.

1. 

   1 Best overall Macromatic

   Macromatic MR-3U 10A Three-Phase Voltage Monitor Relay

   ★★★★★4.6/5 $114.76

   A reliable three-phase voltage monitor with adjustable settings, ideal for industrial motor protection.

   • Adjustable trip points
   • Wide voltage range
   • Durable build

   • Slightly expensive

   View on Amazon manufacturer site
2. 

   2 Best for three-phase systems CARLO GAVAZZI

   Carlo Gavazzi DPA01CM44 3-Phase Voltage Monitoring Relay

   ★★★★☆4.5/5 $143.91

   Compact and accurate relay for phase loss, phase sequence, and undervoltage monitoring.

   • Compact size
   • Accurate detection
   • Easy installation

   • Limited voltage range

   View on Amazon manufacturer site
3. 3 Best budget pick

   AutomationDirect AD-PS1 Phase and Voltage Monitor

   ★★★★☆4.4/5 $40-$55

   An affordable yet reliable phase and voltage monitor suitable for single and three-phase applications.

   • Budget-friendly
   • Simple setup
   • Good for light loads

   • Limited features
   • Plastic housing

   View on Amazon manufacturer site
4. 

   4 Best for industrial use Schneider Electric

   Schneider Electric RM35LV3D Voltage Monitoring Relay

   ★★★★★4.7/5 $154.96 Only 5 left

   High-precision voltage monitoring relay with multiple thresholds and a clear LCD display.

   • High accuracy
   • LCD display
   • Multiple thresholds

   • Higher price
   • Complex setup

   View on Amazon manufacturer site
5. 

   5 Best value Omron

   Omron K8DT-VS3 Voltage Monitoring Relay

   ★★★★☆4.5/5 $101.00 Only 3 left

   A versatile relay with both overvoltage and undervoltage protection, easy DIN rail mount.

   • Over/undervoltage protection
   • DIN rail mount
   • Compact design

   • No phase sequence detection

   View on Amazon manufacturer site
6. 

   6 Best for harsh environments Eaton

   Eaton EMDV430 Voltage Monitoring Relay

   ★★★★☆4.3/5 $585.32 Only 12 left

   Rugged voltage monitor capable of handling extreme temperatures and high vibration.

   • Rugged construction
   • Wide operating temperature
   • Vibration resistant

   • Bulkier size
   • Limited adjustability

   View on Amazon manufacturer site

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