Merus™ 4DRIVES – Active Harmonic Filter

Merus™ 4DRIVES – Active Harmonic Filter

Merus™ 4DRIVES is an optimized active harmonic filter that is very easy to operate and commission. It is our simple solution to complex power quality problems.

  • User-friendly operation and functionality with easy commissioning
  • Simple to integrate into VFD scope of supply
  • Aimed specifically for volume Original Equipment Manufacturers (OEM) and system integrators
  • Fully designed, manufactured, and tested by Merus Power in Finland
  • Strong industrial background with 15-year experience in power quality solutions

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Functions and customer benefits

Key functions
  • Improves power quality and energy efficiency and enhances sustainability
  • Ensures operational reliability and higher productivity
  • Increases redundancy and reduces maintenance costs
  • Helps comply with demanding power quality standards and regulations
Customer benefits
  • Longer lifetime of electrical and process equipment with reduced maintenance costs
  • Compliance with IEEE 519, G5/4, EN 50160, and other power quality standards and regulations
  • Reduced operational expenditure (OPEX) and increased mean time before failure (MTBF)
  • Compact modular and scalable design
  • Access to professional technical and after-sales support 24/7


Merus™ 4DRIVES active harmonic filter provides an optimized solution for variable frequency drive (VFD) applications. One active harmonic filter can be used for multiple six-pulse drives in a system. The filter selection and dimensioning can be made based on the needed harmonic current distortion. The filter current rating is substantially lower than the combined drive load current, which allows savings in comparison to active front-end (AFE) drives.

Typical segments of Merus™ 4DRIVES include water and wastewater treatment plants, buildings and heating, ventilation, and air conditioning (HVAC) applications, data centers, and industry applications.

Merus™ 4DRIVES module features

Harmonic current compensation

Mitigates harmonic current in the measurement point – mitigating current/voltage distortion

Reactive power compensation

Mitigates reactive power – power factor improvement, voltage sag mitigation

Load current balancing

Balances fundamental cycle current – evens phase imbalance

  • Operation and experience in challenging environments THD(V) <10%
  • Capability to compensate 3rd harmonic in phase unbalance situation
  • Optimized compensation for drive usage and enhances the lifetime of drive

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