• 21M-3-Phase-Monitor-with-Trip-and-Restart-Delays

    21-LM

    3-Phase Monitor with Trip and Restart Delays

    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 UL Recognized (U.S. and Canada) and are available with optional gold flashed silver contacts for low current applications.

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  • 21M-3-Phase-Monitor-with-Trip-and-Restart-Delays

    21M

    3-Phase Monitor with Trip and Restart Delays

    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 UL Recognized (U.S. and Canada) and are available with optional gold flashed silver contacts for low current applications.

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  • 22-3-Phase-Voltage-Band-Monitor-SPDTx2-with-Trip-and-Restart-Delays

    22

    3-Phase Monitor with 2X SPDT Contacts and Trip and Restart Delays

    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 22 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 along with 2 SPDT relay contacts.

    Automatic or manual restart versions are available. The Model 22 does not require a neutral connection and can be used on either Wye or Delta systems.

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  • 22-3-Phase-Voltage-Band-Monitor-SPDTx2-with-Trip-and-Restart-Delays

    22-H

    3-Phase Monitor with 2X SPDT Contacts and Trip and Restart Delays

    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 22 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 along with 2 SPDT relay contacts.

    Automatic or manual restart versions are available. The Model 22 does not require a neutral connection and can be used on either Wye or Delta systems.

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  • 22M-3-Phase-Voltage-Band-Monitor-SPDTx2-with-Trip-and-Restart-Delays

    22-HM

    3-Phase Monitor with 2X SPDT Contacts and Trip and Restart Delays

    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 22 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 along with 2 SPDT relay contacts.

    Automatic or manual restart versions are available. The Model 22 does not require a neutral connection and can be used on either Wye or Delta systems.

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  • 22-3-Phase-Voltage-Band-Monitor-SPDTx2-with-Trip-and-Restart-Delays

    22-L

    3-Phase Monitor with 2X SPDT Contacts and Trip and Restart Delays

    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 22 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 along with 2 SPDT relay contacts.

    Automatic or manual restart versions are available. The Model 22 does not require a neutral connection and can be used on either Wye or Delta systems.

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  • 22M-3-Phase-Voltage-Band-Monitor-SPDTx2-with-Trip-and-Restart-Delays

    22-LM

    3-Phase Monitor with 2X SPDT Contacts and Trip and Restart Delays

    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 22 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 along with 2 SPDT relay contacts.

    Automatic or manual restart versions are available. The Model 22 does not require a neutral connection and can be used on either Wye or Delta systems.

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  • 22M-3-Phase-Voltage-Band-Monitor-SPDTx2-with-Trip-and-Restart-Delays

    22M

    3-Phase Monitor with 2X SPDT Contacts and Trip and Restart Delays

    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 22 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 along with 2 SPDT relay contacts.

    Automatic or manual restart versions are available. The Model 22 does not require a neutral connection and can be used on either Wye or Delta systems.

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  • 22VB-3-Phase-Voltage-Band-Monitor-SPDTx2-with-Trip-and-Restart-Delays

    22VB

    3-Phase Voltage Band Monitor with 2X SPDT Relays and Trip and Restart Delays

    A microcontroller-based universal 3-phase voltage band monitor for protecting 3-phase motors of any size from abnormal power conditions. The Model 22VB can detect under voltage, over voltage, voltage unbalance, reverse phase, and single-phasing even when regenerated voltage is present. Status of the 3-phase system is indicated by LEDs .

    Relay operation is fail-safe, i.e. the two SPDT output contacts drop out when a fault condition or loss of power occurs. Under and over voltage trip points are both adjustable. The under voltage adjustment has two scales, 185-240VAC and 370-480VAC. The over voltage adjustment also has two scales, 208-264VAC and 416-528VAC. The Model 22VB will auto-range to the appropriate scale. Trip and restart delay adjustments are provided to preventing nuisance tripping during power fluctuations or short cycling in compressor applications. Voltage unbalance trip point is fixed at 6%.

    The Model 22VB does not require a neutral connection and can be used on either Wye or Delta systems. Operating power for the Model 22VB is drawn from phases A and C.

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  • 25-True-RMS-3-Phase-Monitor

    25

    True RMS 3-Phase Monitor

    Model 25 True RMS 3-Phase Monitor has a display that shows the voltage with an accuracy of +/- 0.5%. The display is updated every second and re-initialized every 30 seconds. Model 25 has a rotary encoder with switch on the unit. By pressing the encoder switch for more than 5 seconds, the unit will enter the setup mode.This unit has a user selectable relay option for High-Low or DPDT. It can also be user-selected to energize on fault or de-energize on fault. The user can select automatic or manual restart on the Model 25. The Model 25 True RMS 3-Phase Monitor can be either calibrated using a True RMS Voltmeter or can be restored to factory defaults in the field.

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  • 2500-3-Phase-Monitor

    2500-120

    3-Phase Monitor

    The Model 2500 3-Phase Monitor is designed to continuously monitor 3-phase power lines for abnormal conditions. This device features solid-state voltage and phase-angle sensing circuits, which drive a SPDT electromechanical output relay.

    When the correct voltage and phase sequence is applied to a specified Model 2500, the output relay will not energize. An under voltage, phase reversal, phase unbalance or phase loss condition will cause the output relay to energize, even if regenerated voltage is present. Complete power loss will not cause Model 2500 to trip. The 2501 version of this unit operates in fail-safe mode, and the contacts de-energize on a fault condition. A neutral connection is not required, allowing the Model 2500 or 2501 to be used with either Wye or Delta system configurations.

    Each option on the Model 2500 or 2501 monitor is adjustable throughout its operating range. The adjustment pots and LED indicators for VOLTAGE ADJUST, UNBALANCE ADJUST and TIME DELAY are mounted on the front of the unit for easy access.

    Seven versions of the Model 2500 or 2501 cover voltage ranges from 120 to 600 VAC, and are UL Listed and CSA Certified.

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  • 2500-3-Phase-Monitor

    2500-208

    3-Phase Monitor

    The Model 2500 3-Phase Monitor is designed to continuously monitor 3-phase power lines for abnormal conditions. This device features solid-state voltage and phase-angle sensing circuits, which drive a SPDT electromechanical output relay.

    When the correct voltage and phase sequence is applied to a specified Model 2500, the output relay will not energize. An under voltage, phase reversal, phase unbalance or phase loss condition will cause the output relay to energize, even if regenerated voltage is present. Complete power loss will not cause Model 2500 to trip. The 2501 version of this unit operates in fail-safe mode, and the contacts de-energize on a fault condition. A neutral connection is not required, allowing the Model 2500 or 2501 to be used with either Wye or Delta system configurations.

    Each option on the Model 2500 or 2501 monitor is adjustable throughout its operating range. The adjustment pots and LED indicators for VOLTAGE ADJUST, UNBALANCE ADJUST and TIME DELAY are mounted on the front of the unit for easy access.

    Seven versions of the Model 2500 or 2501 cover voltage ranges from 120 to 600 VAC, and are UL Listed and CSA Certified.

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