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  • Electrical safety for unearthed power supplies (IT systems)
  • Insulation monitoring equipment, insulation fault location systems
  • Power supplies for medical applications
  • Measuring and monitoring relays
  • Electrical safety for earthed power supplies (TN systems)
  • Using renewable energies efficiently: wind power, photovoltaics
  • Test systems for electrical equipment and medical technology


The power supply unit AN420 is used to supply measuring current transformers of the W…AB series. The CTs are to be supplied with a symmetrical supply voltage of DC ± 12 V using a pre-fabricated connecting cable of the WXS… series.

The power supply unit is capable of supplying up to six W…AB series measuring current transformers.

The ON LEDs +12 V, -12 V indicate that the symmetrical output voltage of ± 12 V is applied.


  • Power supply for W…AB(P) series measuring current transformers
  • Supply up to six measuring current transformers


  • Power supply for W…AB(P) series measuring current transformers

Downloads for AN420

Manuals AN420 425.7 KB DE13.05.2019 10:31:40D00081
Manuals AN420 425.7 KB EN13.05.2019 10:31:40D00081
Datasheets AN420 270.7 KB DE13.05.2019 10:31:33D00081
Datasheets AN420 242.8 KB EN13.05.2019 10:31:35D00081
Datasheets AN420 237.3 KB ES13.05.2019 10:31:37D00081

Optional accessories for AN420

TypeArt. No.
Mounting clip for screw mounting (1 piece per device, accessories)B98060008

Connecting cables for measuring current transformers of the W…AB series

TypeLengthArt. No.
WXS-1001 mB98080506
WXS-2502,5 mB98080507
WXS-5005 mB98080508
WXS-100010 mB98080509

AN420 Variants

TypeSupply voltage USOutput voltageArt. No.*
AN420-2DC/AC 70…276 V, 42…460 HzDC ± 12 V/400 mAB74053100

*(B7… = push-wire terminal / B9… = screw-type terminal)