AR180 series automatic capacitor banks

AR180 series THDi ≤ 85%

Industrial plants where the load varies greatly throughout normal operation will require automatic P.F. equipment in order to connect the necessary capacitive power. 

More details

Technical characteristics

  • Rated voltage: 400Vac
  • Rated frequency: 50Hz (60Hz on request)
  • Voltage of auxiliary circuits: 110Vac
  • Working temperature range: -10°C/+50°C
  • Cubicle: 20/10mm sheet steel, protected against corrosion by a phosphating treatment. Epoxy powder painted, RAL 7035 color (other colors on request) External Protection Degree: IP30 (type S-M), IP40 (Type L) Locking system: by screw for cubicle type S and type M by key for cubicle type L
  • Ventilation: Forced
  • Isolating switch: Three-pole with door interlocking device
  • Supply: Type M: entry of the cable from the top Type L: entry of the cable from the bottom
  • Wiring: By N07VK CEI 20-22 flame retardant cables. Auxiliary circuits are identified as in the electrical drawing
  • Contactors: Each bank of capacitors is controlled by a three-pole contactor. To limit the overcurrent peaks, each contactor is provided with insertion resistors. Rated voltage of auxiliary circuits: 110 Vac, 50 Hz .
  • Fuses: Each bank of capacitors is protected by a set of three fuses (NH00 type) with high breaking capacity. Also the auxiliary circuits are protected by fuses.
  • Capacitors AR180 550 Vac Series Single phase of type self-healing, made up of metalized polypropylene, equipped with overpressure safety device and discharge resistor. Filling: biodegradable non toxic dry type, PCB free. Manufactured using new technologies of metallization. Delta connection. Capacitance tolerance: -5% +10% Dielectric losses: <0.3W/kvar Temperature class: -25°C (55°C)
  • Blocking Reactors: Tuning frequency 180Hz (3,6=7,7%)
  • Regulators: Varmetric measurement by means of a C.T. (Current Transformer)(secondary 5A) not supplied
  • Reference Standards: Comply with L.V. 73/23 (93/68) EEC Directive Capacitors: CEI EN 60831-1/2 Equipment: CEI EN 60439-1, CEI EN 61921-1
  • Options (on request): Automatic switch Isolator with fuses Protection degree : IP55 Type M: entry of the cable from bottom Type L: entry of the cable from the top

Power Factor Correction in presence of harmonics

In recent years, Power Factor Correction has evolved greatly due to the presence of generated harmonics by the loads. These loads produce harmonic currents and voltage which distorts the network waveforms. The main sources of harmonics are generated by AC/DC static converters and UPS systems. For these reasons it is essential that any installation of Power Factor Correction equipment must be carefully evaluated. The possible presence of harmonic currents in the network could create conditions of parallel resonance between the inductance of the network and the capacitors, generating overcurrents and overvoltages, which would cause premature failure of the power factor correction capacitors. The ideal power factor correction solution for any system must be determined by examination of the system parameters and harmonic spectrum.

Power factor correction

Level of current harmonic distortion allowed in the equipment

THDiC % on the capacitorsTHDIi % on the networkCapacitor banks
≤ 25≤ 10*B25PF/R
≤ 35≤ 15*B35PF/S
≤ 50  ≤ 20*B50PF/XS
≤ 85≤ 50**AR180PF/A
≤ 100  ≤ 100**AR140PF/HA

The new RAUNI regulators are equipped with alarm threshold, which disconnects the equipment if the ALARM THDi is exceeded. Equipments with blocking inductance have this threshold detection disconnected because there is no resonance risk. * Resonance not allowed ** THDv max 6%

Network: 400Vac 50Hz THDi ≤50%. THDVMAX 6%

Blocking Reactors: 180Hz (3,6=7,7%)

Capacitors: 550Vac 50Hz, THDi ≤85%


WxDxH, mm


kVAR at 400V

Power of banks




Isolating switch








kVAR at 415V

AR180PFMA-20 420x380x920202,5-2,5-5-108125RAUNI9628,54722
AR180PFMA-30 420x380x920305-5-10-106125RAUNI9643,25733
AR180PFMA-40 420x380x1140405-5-10-208125RAUNI9657,67443
AR180PFMA-50 420x380x1140505-5-10-10-2010250RAUNI96727854
AR180PFMA-60 420x380x11406010-10-20-206250RAUNI9686,410065
AR180PFMA-70 420x380x13607010-20-20-207250RAUNI96100,811275
AR180PFMA-80 420x380x13608010-10-20-20-208250RAUNI96115,212686
AR180PFLA-100 610x610x176010020-40-405250RAUNI144144220108
AR180PFLA-110 610x610x176011010-20-40-4011250RAUNI144158240118
AR180PFLA-150 610x610x176015010-20-40-40-4015400RAUNI144216280161
AR180PFLA-180 610x610x176018020-40-40-809400RAUNI144260300194
AR180PFLA-220 610x610x176022020-40-80-8011630RAUNI144317325237
AR180PFLA-260 610x610x196026020-40-40-80-8013630RAUNI144375365280
AR180PFLA-300 610x610x196030020-40-80-80-8015800RAUNI144432385323
AR180PFLA-340 610x610x216034020-40-40-80-80-8017800RAUNI144491415365
AR180PFLA-380 610x610x216038020-40-80-80-80-80191250RAUNI144547445409
AR180PFLA-420 610x610x236042020-40-40-80-80-160211250RAUNI144606475452
AR180PFLA-460 610x610x236046020-40-80-80-80-160231250RAUNI144663505495
AR180PFLA-500 1220x610x196050020-40-40-80-160-160252x630RAUNI144722775538
AR180PFLA-560 1220x610x196056080-160-160-16072x800RAUNI144806800603
AR180PFLA-640 1220x610x196064080-80-160-160-16082x800RAUNI144922860689
AR180PFLA-720 1220x610x216072080-160-160-160-16092x800RAUNI1441037920775
AR180PFLA-800 1220x610x216080080-80-160-160-160-160102x800RAUNI1441152980861
AR180PFLA-880 1220x610x236088080-160-160-160-160-160112x1250RAUNI14412671040947
AR180PFLA-960 1220x610x236096080-160-160-160-160-240122x1250RAUNI144138211001033