For all our series is possible to use a special type of capacitors named 3In/4In that are the strongest solution for power factor correction industrial facilities. IRI3In capacitors are tested at three times the nominal current and are particularly suitable for plants with medium/high harmonic currents and/or high working temperatures. 3In capacitors compared to standard capacitors are much more resistance against current overload; continuous capacity over time; high working temperature; great peak current endurance; current harmonics great endurance. The other generic characteristics of equipment are the same of the series standard. THDIc max allowed on the capacitors 85% 3In – 90% 4In THDIr max allowed on the network 27%.