Coupling NX7 bsr-3-690-125.3 - 125Amp 3-Phase Surge & EFT CDN

EM Test 125A Automatic Coupler:

  • EUT Supply 3-Phase 690VAC/1kVDC 125Amps
  • Compliant Current Ratings <32 A, 63 A, 125 A
  • Must be Used with 400Volt NX5/NX7 Test Systems
  • Includes Laptop with Iec.control Software Installed. 
  • Automatic Selection of Combination Wave Impedance

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Coupling Accessories



The three-phase coupling/decoupling networks of the coupling NX series are used to couple EFT/Burst-, Surge- and Ring wave pulses on DC-lines or to three-phase (4-wire or 5-wire) mains supply systems for voltages up to 1,000 VDC / 3 x 690 VAC. This includes the more and more common testing of inverters used in the area of renewable energies (e.g. photovoltaic systems, wind power stations, electric cars).

Full compliance over a wide range of EUT current, within 16A , 32 A, 63 A, 125 A and 200 A settings. Higher current ratings on request.


The coupling NX-series coupling/decoupling networks are built fully compliant to the standard requirements of EN/IEC 61000-4-4, EN/IEC 61000-4-5 and EN/IEC 61000-4-12. Residual voltage levels are carefully considered as well as the value of the decoupling inductors in order to meet the requirements with regard to voltage drop at the rated current of each type of CDN.

Being fully controlled by the related generators, couplings of the coupling NX are set automatically as selected for the test (either by manual operation or via software). When performing surge tests the generators will automatically set the required source impedance depending on the standard and the coupling mode.

Models are available with multiple current ranges with waveshape specification that are fully compliant to IEC 61000-4-5. in each selectable EUT current range. Offering the advantage that nearly all EUT's can be tested with just one CDN!

Data SheetUser Manual


Common Standards

EN/IEC 61000-4-4, EN/IEC 61000-4-5, EN/IEC 61000-4-12

Three-phase CDN

According to EN/IEC 61000-4-4, EN/IEC 61000-4-5 and -4-12 for Burst up to 5.5 kV Surge and Ring wave up to 7 kV

Current ranges*

<32 A, 63 A, 125 A


IN (AC): CEE 690/125,

IN (DC): MC Safety plug 6 mm,

OUT: MC Safety plug 6 mm

EUT supply   

3 x 690 V, 125 A, 50/60 Hz 1,000 VDC, 125 A


Size: RAC 34 IEC included, Weight: approx. 250 kg


26 pin high density connector to control an external devices

Connector EUT supply    

3 x 480 V, CEE plug, 16 A to 125 A,

3 x 690 V, CEE plug, 16 A to 63 A,

plugs for all other current ratings

Connector to EUT

up to 32 A: 4 mm safety plug,

63 A: 6 mm safety plug,

125 A: 6 mm safety plug,

200 A: 10 mm safety plug


Supply voltage       

85 V - 264 V


50/60 Hz


approx. 75 W Standby: 100 mA


115 V: 2 x 4 A slow blow,

230 V: 2 x 2 A slow blow


Safety standard

IEC/EN 61010

Security circuit     

Control input (24 VDC)

Warning lamp

Floating contact (max. 60 V/2 A)



10 °C to 35 °C


30 % to 75 %, non condensing

Atmospheric pressure

86 kPa (860 mbar) to 106 kPa (1,060 mbar

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