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M931/M531can apply to automatic liquid -level/pressure control and protection of stainless steel / cast iron deep -well, submersible pump, pipeline pump, protection functions include: Dry running, over voltage, under voltage, over current, open phase etc.

Applied for AC200-440V/50HZ(60HZ), three phase, 0.75-7.5KW stainless steel / cast iron deep -well, submersible pump, pipeline pump,

Its special layout makes it possible to realize the sensitive and reliable stopping protection against pump dry -running without installing lower water tank (well|) probe.

Features:
. Applied for water supply and drainage
. Computer main board and module for industrial & civil pump
. Auto / Manual switch
. Automatic Stops the pump in the case of water shortage, protecting it from dry running without installing sensors in the well
. Automatic protection and automatic alarm against short- circuit, over-current and open phase.
. Under /Over Voltage protection (M931)
. Digital voltmeter/ampere meter real-time display
. Light alarm signals of malfunction
. Single-key setting and memory function of protective parameter calibrating
. Starts and stops the pump in accordance with the different liquid level or pressure
. Pump accumulative running time displaying
. Present liquid-level sensor
. User-friendly connection diagrams
. Integrated design, small size, easy to install