OM-310 power limiter is designed for the following applications:

• load protection at poor parameters of the mains;
  
• complete load cutoff in case if watts input exceeds the main threshold within the user-set time period;
  
• partial load cutoff in case if watts input exceeds the additional threshold within the user-set time period;
  
• measurement and indication of 3-phase electric circuit (delta voltage and mesh voltage RMS values; positivephase, negative phase and zero phase sequence voltages; phase currents RMS values; input wattage of activepower, wattles power, apparent power, power factor (cos ϕ))- fault warning;
  
• remote load on and off via RS-232/RS485 interface or and external switch.
  
• OM-310 provides for operation under loads ranging from 2,5 kW to 30 kW with use of integrated current transformers,and up to 350 kW at use of external current transformers, including when in networks with insulated neutral.

OM-310 device provides the following types of load protection:

• when the mains voltage is of poor quality (impermissible voltage surges, phase loss, incorrect phase sequenceand phase "coincidence", phase/line voltage imbalance);
  
• when maximum specified current in any load phase is exceeded;- against “ground” leakage currents;For each separate type of protection, the unit allows to enable or disable automatic load reset (further: AR)OM-310 provides electric equipment protection by means of a magnetic starter (contactor) coil control.

Using OM-310 the user has possibility to choose functionality of additional relay and use it for following operations:

• signalization emergency situations
  
• contactor connection of additional loading
  
• as time relay
  
• signalization of reactive power excess
  
• signalization of active power excess

Communication

ОМ-310 provides for:

• control and parameters transfer via RS-485 interface according to MODBUS protocol,
  
• control and parameters transfer via RS-232 interface.
  

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Basic technical parameters and characteristics:

• Rated supply voltage: Three-phase: 380V 50Hz
  
• Mains frequency, Hz: 48-62
  
• Rated load wattage range (during operation with use of integrated current transformers), kW: 3-30
  
• Tripping threshold accuracy for wattage, % of rated wattage, at most: 5
  
• Tripping threshold accuracy for current, % of rated current, at most: 2
  
• Tripping threshold accuracy for voltage, V, at most: 3
  
• Phase imbalance detection accuracy for voltage, V, at most: 3
  
• Minimum operational voltage:
  
• -single-phase voltage power supply when one phase and neutral wires are connected, V, not less: 180
• - three-phase power supply voltage, V, at most: 450
• Analog inputs:
  
• - remote switch connection input
• - three analog inputs for connecting standard CT with 5A output (of Т-0.66 type or similar)
• - input for connecting differential current transformer (zero sequence transformer)Main outputs load relay
• - two groups of changeover contacts -8A 250V cos φ=1; characterizing relay
• – one group of changeover contacts -16A 250V at cos φ=1 (the relayfunction is assigned by the user);
• Power consumption (under load), VA, at most 5,0Enclosure protection degree:
  
• - frame: IP40
• - terminal block: IP20
• Climate zone version: У3.1 (moderate)
  
• Operating temperature range, °C from -35 to +55
  
• Storage temperature, °C: from -45 to +70
  
• Weight, kg, at most: 0,5
  
• Case dimensions (diagram 1.1) - nine S-type modules
  
• Mounting onto standard 35 mm DIN-rail
  
• Mounting position: any 
  

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