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IRZ–700 series soft starters for ESPs

The station ensures control, parameters monitoring and protection of submersible asynchronous motors with power ranging from 14 to 320 kW enabling smooth acceleration and deceleration.


  • various modes of start and stop
  • small overall sizes and weight
  • easy operation and maintenance
  • easy connection
  • 4-line display
  • history recording to a USB Flash
  • software update without motor operation interruption
  • bus design of the power system


  • 4 start modes: start with current increase, start with current limitation, inching start, across-the line-starting
  • 2 stop modes: smooth deceleration, run-down stop
  • manual or automatic control
  • continuous control of supply voltage, order of phase sequence, currents in three phases and isolation resistance of the “pump transformer — power cable — motor” link
  • calculation of voltages and currents unbalance, power factor, load factor, consumed power, operation time
  • connection to ground acquisition units of downhole sensor systems produced by IRZ TEK and other manufacturers
  • record of controlled parameters and causes of motor shutdown in real-time mode with saving of records during power interruptions
  • protection of equipment against emergency modes caused by failures in electric mains and submersible equipment

After actuation of the protection system, the station automatically restarts when parameters return to the working range.

The control station

  • allows for connection of appliances with 220 V rated voltage and up to 10 A consumption current to a female connector on the operator’s panel of the station
  • can be connected to mains with 380 V rated voltage and up to 60 A phase current
  • can be integrated into oilfield telemechanics (normally closed and normally open contacts)
  • can be connected to a SCADA-system via RS-232 or RS-485 interfaces using the Modbus-RTU communications protocol
  • has a GPRS-modem to transmit data via Internet

Upon request, the control station may include a power metering system registered in the State Register of Measuring Devices.

Supply voltage, V 190…520
Power of connected motor, kW 14…320
Control of motor operating current, A (performed on the primary winding of the pump transformer with re-computation into the actual motor operating current) 0…2000
Control of insulation resistance of the “transformer — power cable — motor” link, kOhm 0…10000
Control of turbine rotation frequency, Hz 1…50
Error of current, voltage, rotation frequency and time setting control, % 2
Error of insulation resistance control, % 5
Enclosure protection class IP43
Operating temperature, °С -60…+60


DesignationRated current, АOverall dimensions, mmWeight, kg
IRZ–721–250 250 1685х765х635 160
IRZ–722–400 400 180
IRZ–723–630 630 200
IRZ–724–800 800 220
IRZ–725–1000 1000 240
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