Time Mark Corporation MODEL 21

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Universal voltage 3-phase monitor. 190-480 VAC with trip; restart timers and u
Manufacturer #: MODEL 21
Allied Stock #: 70975940


Datasheet Datasheet

Pricing (USD) & Availability
Standard Pricing
$107.41 (Each)
1 $107.41

4 can ship immediately.

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Minimum Quantity: 1

Multiples Of: 1


Monitoring Function : Phase Monitor
Mounting Type : DIN Rail
Relay Type : Electromechanical
Series : 21 Series
Special Features : LED Status Indicators
Type : 3-Phase


The Model 21 Series
The Model 21 is a microcontroller-based universal 3-phase monitor for protecting 3-phase motors from abnormal power conditions. It can detect under voltage, over voltage, voltage unbalance, reverse phase, and single-phasing even when regenerated voltage is present. The Model 21 includes adjustable trip and restart delays to prevent nuisance tripping during power fluctuations and short cycling in compressor applications. The LED status indicators and adjustment pots for Voltage Adjustment, % Unbalance, Restart Delay and Trip Delay are mounted on the front of the unit for easy access.

Automatic or manual restart versions are available. The Model 21 does not require a neutral connection and can be used on either Wye or Delta systems.

All versions of the Model 21 are available with optional gold flashed silver contacts for low current applications.


  • Monitors 3-Phase Voltage for Phase Loss, Phase Reversal, Over Voltage, Under Voltage and Voltage Unbalance
  • 190-480 V
  • LED Status Indicators
  • 8-Pin Octal
  • 5 Yr. Unconditional Warranty

  • Product Added to Cart
    Time Mark Corporation
    Universal voltage 3-phase monitor. 190-480 VAC with trip; restart timers and u
    Allied Stock #: 70975940
    Mfr's Part #: MODEL 21
    $107.410 Each
    Quantity added: