V4780 S2 External Variac - Dips Auto Transformer

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EM Test Dips Transformer:

  • 1-Phase Dips & Interruptions Transformer 
  • Max Current 16Amps (Nominal) & 250Volts 
  • Designed for use with EM Test Series of Generators
  • Fixed taps at 40 %,70% and 80% of Nominal

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Conducted RF CDN Features  

      • CDN for 3 Conductors Powerline 
      • Frequency 150 kHz - 300 MHz
      • Three-Line (M3) Model - 25Amp Per Line
      • Fully Compliant CISPR 16-1-2 and IEC 61000-4-6
      • RF Input Voltage: 40 V (Max)


EMTest automated external transformer for the UCS 500n7 and UCS 500n5 generators to perform the dips and interrupts test for EN IEC 61000-4-11. Voltage dips and short interruptions simulate a reduction of the power supply voltage for a certain period of time. Four different test levels are required as per IEC/EN 61000-4-11. The V 4780 Series of tapped transformer are used to simulate power supply failures such as voltage dips and interruptions providing taps with 40 %, 70 %, 80 % and a direct output with 100 % of the nominal mains supply voltage. Depending on the model the taps are selected manually or by means of the 0-10 V DC signal provided by the test generator.

Data Data Sheet


Common Standards

EN IEC 61000-4-11

Voltage Dips:

0, 40%, 70%, 80%

Transition Time

Risetime, falltime ≥1µs & ≤5µs

Input Voltage

250VAC, 50/60Hz

Input Current

0 - 16 A rms


7 kg, 15 pounds


10x17x19 cm, 4x7x8 inches

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