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Low-voltage capacitors for power factor correction and improving power quality

As a source of reactive power, Hitachi Energy low-voltage capacitors QCap provide significant improvement of power quality and reduction in energy cost by:

  • Reducing or eliminating expensive utility penalties for low power factor 
  • Reducing power losses in cables and transformers
  • Reducing the installation size
  • Increasing power transmission capacity in cables
  • Increasing available transformer capacity
  • Improving voltage stabilization in long cables


QCap capacitor units are used in industrial and commercial installations for reactive power compensation applications.

Why Hitachi Energy?

The low-voltage capacitor QCap from Hitachi Energy has the following features:

  • Dry type design
  • Safe sealing design
  • Exclusive overpressure disconnection system
  • Long lifetime
  • Standardized capacitor range in a cylindrical form
  • Easy to mount in a capacitor bank
  • Flexible: can be mounted in both horizontal or vertical position
  • Hitachi Energy in-house metalized film giving excellent dielectric properties
  • Optimized thermal dissipation
  • Low losses design
  • Complies with international standards, CE, CSA and UL marked

Brief performance data

 Voltage range From 220 to 690 V 
Frequency 50 and 60 Hz
Connection Three-phase
Net output power From 2.5 to 30 kvar
Tolerance on capacitance 2.5-12.5 kvar: -5%/+10%
15-30 kvar: 0%/+10%
Losses <0.2 Watt/kvar (dielectric only)
<0.5 Watt/kvar (including discharge resistor)
Discharge resistor Included. Discharge from Un to 50V in 1 minute
Maximum permissible current 1.3 x In for continuous operation
Tolerance on voltage  1.1 x Un for maximum 8 hours in every 24 hours (according to IEC 60831)
Case material Recyclable aluminum
Color Raw aluminum
Fixing 1 stud (M12). Recommended torque: 10Nm
Dimensions (DxH) 90x417 mm
Weight 3 kg
Terminals Cage screws. Recommended torque: 2Nm
Minimum distance above unit 20 mm
Maximum distance between capacitors 30 mm
Earth Earth connection on the enclosure fixation
Execution Indoor use only
Temperature range -25°C/+55°C (class D according to IEC60831)
Altitude Up to 2000 m without derating
Protection degree IP20
Standards  IEC 60831-1 (2014), IEC 60831-2 (2014), UL 810, CSA C22.2 No 190

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