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EuroSMC EMU-25 MCB Testing Equipment


The EMU-25 is a totally complete electronic unit. The following gives details of this testing unit.

  • Complete computer control with its corresponding software and communication board, RS-485. The program has the possibility to control up to 20 units at the same time.
  • The unit generates a digital wave form, from an oscillating quartz and adjusts this wave in 1024 point/cycle which insures the exact frequency and very low distortion.
  • The reference amplitude in DC and the selection by a DAC of 12 bits, allows a continued feedback, comparing the output level with the reference and activates a signal which controls the power amplifier, to ensure a perfect stabilized and accurate output, even though there are variations in the load, power supply etc.
  • The power module is compact, with forced ventilation and contains an auto power switch which gives the maximum power required in relation to the load. This achieves a very efficient output and low dissipation.
  • The transformer load coupled to the power amplifier, allows an galvanic insulation and perfect joining of this load.
  • Computer control of an external element up to 220V (external auxiliary contact).
  • Synchronizes the output wave in phase and/or frequency with respect to external signals (frequency/phase reference).
  • The unit contains an output overload, thermal, and auxiliary power supply alarms as well as a connector for a DC measuring instrument, for easy verification.


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SKU: EuroSMC EMU-25 Category: Tag:

EuroSMC EMU-25 Characteristics

  • Regulation 0 to 25A AC.
  • Nominal power: 300VA.
  • Can be connected in parallel.
  • Input for external phase and/or frequency reference.
  • Computer controlled via serial port RS-485 (adapted to RS-232).
  • Overload, overheating alarm LED’s.
  • Rack mounting (standard 19-inch)
  • Accuracy ±1%.
  • Distortion less than 1%.


  • To test small circuit breakers.
  • Calibration of shunts and measurement instruments.
  • To test thermic relays which require a longer duration.
  • Overheating test.
Current Output 0.4A to 4A
4A to 15A
15A to 25A
Nominal Power 4A / 81.5V (325VA) 55% W max.
15A / 18.3V (275VA) 82% W max.
25A / 9.0V (225VA) 100% W max.
Distortion less than 1%
Accuracy ±1% of reading
Stabilizing Time less than 3 seconds
Connection/Disconnection Time less than 1ms (electronic)
Measurement Output 0 to 2 Volts DC
Accuracy minimum: ±2% of reading
Auxiliary Contact Output (by Triac) 220V / 50mA
Time Measurement Starts with current injection / Stops with output open
Resolution 0.25 to 9999 seconds
Accuracy minimum: ±0.01% of reading ±0.25s
External Frequency Input f in = 1024xf out: opto-coupled 5V / f out: 45Hz to 65Hz
External Phase Input opto-coupled 5V
General Specifications
AC Power Supply 220V ±10% 50/60Hz, 1000VA
Dimensions 482mm (W) x 175mm (H) x 370mm (D)
Weight 30kg
Standard Accessories
Power Cable 1 x Power cable
Manual 1 x Instruction manual
Ordering Information
Model Name Description
EuroSMC EMU-25 AC Current Power Supply to 25 Amps


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