Frequency protection relay VFR-100X
voltage4 NOthree-phase

frequency protection relay
frequency protection relay
frequency protection relay
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Measured/monitored value
voltage, frequency
Contact configuration
4 NO
three-phase, AC
Other characteristics
with fault indication, digital, programmable, configurable, adjustable, time delay, multifunction, compact, RS485, panel-mount, for generators, retrofitting, for electric motors


The device has been designed for continuous monitoring of the system’s voltage, frequency and related variations. It is able to disconnect one or more loads in case of underfrequency (up to 7 stages) or frequency negative rate of change (up to 2 stages). The VFR protects industrial and commercial power networks in case of voltage disturbances. Applications - Commercial, industrial and public utility Protection and Functionality - Under & Over Voltage - Frequency - dF/dT (up to 2 stages) - Phase Sequence - Underfrequency (up to 7 stages) - Overfrequency (up tp 3 stages) Communication - RS485 port, Modbus RTU Protocol Digital Measurement - Phase and Line Voltages - Phase Sequence - Voltage Average - Voltage Unbalance - Voltage THD - Voltage Harmonics - Frequency (Hz) - Frequency variation (negative rate of change df/dt) Signalling - Graphic LCD & LED based HMI - Indication of fault conditions - Indication of the relay status


*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.