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Isolated Standard Signal Conditioner

VariTrans A 21000

The first standard-signal isolation amplifier with broad-range power supply in the 6-mm class.

The VariTrans A 21000 isolates, transmits and converts 0 to 20/4 to 20 mA and 0 to 10 V with a high level of accuracy. In spite of its modular housing being only 6 mm wide, the new VariTrans isolation amplifier provides maximum protection of personnel and equipment through protective separation up to a working voltage of 300 V conforming to EN 61140. The test voltage is 2.5 kV AC. It can be supplied with either 24 V DC or 230 V AC.


  • Broad-range power supply 24 to 110 V DC / 110 to 230 V AC
  • 3-port isolation: prevention of incorrect measurements caused by potential differences
  • Protective separation up to 300 V AC/DC according to EN 61140
  • High isolation -2.5 kV AC test voltage
  • Long service life
  • Extremely low failure rate due to reduced self-heating
  • Cost reduction through smaller enclosures (Closely packed
    mounting of the ultra-compact housings allows for
    more channels per meter DIN rail)
  • High accuracy and temperature stability
  • Gain error 0.2 % meas. val. and temperature coefficient 0.01 %/K
  • Calibrated range selection without complicated adjustments
  • Easy installation
  • Simple connection to the power supply via the DIN rail bus connector
  • UL approval for use in North America
  • Adjustable or fixed-range models
  • Best price/performance ratio

5-year warranty


The Task
Isolation and conversion of 0 ... 20 mA, 4 ... 20 mA and 0 ... 10 V standard sig-nals with high measurement accuracy requirements. At the same time, best possible protection of personnel and equipment must be guaranteed.

The Problem
The standards governing the erection of installations demand protective separation according to EN 61140. The tightly dimensioned installation space on the mounting rail must be optimally used.
Procurement logistics and stockkeep-ing demand a universal product which covers all common signal combina-tions and which can be used around the world with the broad-range power supply.

The Solution
In spite of the just 6 mm wide modular housing, VariTrans A 21000 meets the requirements of EN 61140 regarding protective separation up to an operat-ing voltage of 300 V. The test voltage is 2.5 kV AC.
Very small leakage capacitances also ensure that high transient com-mon-mode interferences can be isolated reliably and don't lead to system malfunctions. Standardization and flexible signal conversion are op-timally implemented by the calibrated range selection – on-site calibration becomes superfluous.


Contact Us
Phone: +49 30 80191-0
Fax: +49 30 80191-200
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