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Electrical and Energy Efficiency Products & Solutions

for Commerce and Industry Worldwide

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The SDC INDUSTRIES solution for active filtering of harmonics for commercial loads including zero-sequence harmonics in the neutral.

- PQF Manager

   - Versatile user interface

- Digital Control (DSP)

   - Programmable filtering characteristics

   - Perfect multi-tuning to selected harmonics (including zero-sequence)

   - Not overloadable

   - Programmable power factor correction

   - Load balancing feature

   - Zero reactive power filtering capability

   - Programmable task priorities

- Power Electronics

   - PWM converter with DC capacitors

   - IGBT technology

- Forced air cooling

- Top or bottom cable entry.


eaf dimension

The EAF4 consists of one master and up to three slave units mounted in cubicles, together with auxiliary apparatus and wiring to form a factory assembled and tested system. The standard EAF4 is offered in IP21 execution and plate execution (IP00).

The dimensions of a single EAF4 unit are 600 x 600 x 2150mm (W x D x H). The dimensions of the IP00 execution are 498 x 400 x 1697mm (W x D x H).

The EAF4 filter is modular in design. On-site extensions are easily made by adding slave units (maximum three) in parallel to the master unit. The EAF4 is suitable for direct connection up to 415V. The EAF4 is offered in units of different ratings. Intermixing of units of unequal rating is not allowed.


  • Offices and Buildings
  • UPS Systems
  • HVAC
  • Computer Centres
  • Lifts.

Typical result of ACTIVE FILTER EAF4 Application

eaf4 applications

Note: the EAF4 also filters harmonics between lines apart from the neutral conductor.


Active Filter for three-phase, four-wire systems for filtering of harmonics, including zero-sequence current in the neutral, reactive power compensation and load balancing.

eaf specification

Connection Diagram

eaf connection diagram


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