AST series static capacitor banks

Static power factor correction serie AST with self anti-harmonics.

THDi ≤ 85%

More details


Static power factor correction equipment differs from the standard equipment for the following reasons: 

  • The reactive power regulator has a switching time of the banks extremely quicker than the standard regulator.
  • The device for switching the capacitors banks is electronic, controlled by thyristors, with the capability of switching the capacitors at zero crossing.

Static switching by thyristors has the following advantages:

  • Maximum speed in switching the capacitors banks (the total power is switched in less than one second)
  • No current peak on the capacitors at the time of switching of the banks
  • No voltage peak on the capacitors at the time of switching off the banks
  • Elimination of deterioration of the contacts of the standard contactors
  • Noise reduced to a minimum
  • Reduced handling
  • Prolonged capacitor life

Technical characteristics

  • Rated voltage: 400Vac
  • Rated frequency: 50Hz (60Hz on request)
  • Voltage of auxiliary circuits: 110Vac
  • Working temperature range: -5°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 Locking system: by key
  • Ventilation: Forced
  • Isolating switch: Three-pole with door interlocking device
  • Supplying: 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
  • Fuses: Each capacitor banks is protected by a set of three fuses (NH00 type) with high breaking capacity. Also the auxiliary circuits are protected by fuses.
  • Activation: Thyristors zero-crossing static devices
  • Capacitors 550 Vac Series Single phase of type self-heating, 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)
  • Self blocking resonant frequency: Tuning frequency 180Hz (3,6=7,7%)
  • Regulators: Varmetric measurement by means of a C.T. (Current Transformer) (secondary 5A) not supplied
  • Reference Standards: Complying with: L.V. 73/23 (93/68) EEC Directive Capacitors: CEI EN 60831-1/2 Equipment: CEI EN 60439-1
  • Options (on request): Protection and Control Instrument SPC2 Protection Degree: IP40 - IP55 Entry of the cable from the top

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

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

Capacitors: 550Vac 50Hz, THDi ≤85%


WxDxH mm


kVAR - 400V














kVAR - 415V

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