Time Mark Corp. Model 158 3-Phase Power Monitor, SPDT, Surface Mount

158 Series*

The Time Mark Model 158 continuously monitors 3-phase power lines for abnormal conditions. When properly adjusted, the Model 158 will detect phase loss on a loaded motor even when regenerated voltage is present. This device consists of a solid-state voltage and phase-angle sensing circuit, driving an electro-mechanical relay. When correct voltage and phase rotation are applied, the internal relay will energize. A fault condition will de-energize the relay. When the fault is corrected, the monitor will automatically reset.

The Model 158 does not require a neutral connection, and can be used with Wye or Delta systems. Four versions cover 120V, 208/240V, 480V (60 Hz) and 380V (50 Hz). Voltage ranges are sufficient to allow for proper adjustment to existing conditions. A front-mounted LED failure indicator is provided.

The "R" versions of the Model 158 monitor have an additional LED indicator for RESTART and a 5 minute short cycle timer, to delay restarting the motor.


  • Surface-mount for HVAC applications
  • Optional 5 minute short cycle time delay
  • Detect phase loss, low voltage, phase reversal
  • Available in 120V, 208/240V, 380V & 480V

Additional Info

  • Surface Mount
  • Phase Monitor
  • Automatic
More Information
Display No
Features Automatic Reset
Manufacturer Time Mark Corporation
Measurement Phase Loss Sensing, Phase Reversal Sensing, Under Voltage Sensing
Type Phase Monitor
Additional Skus B158B, B158BR, 158B, 158BR, A158B, A158BR, EX158B, EX158BR
Additional Details

*Pricing & appearance may vary based on configuration!* Please configure product above.

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