WG 25

Loop-Powered Supply

For supply of intrinsically safe 2-wire transmitters and SMART transmitters


  • Low-cost due to omission of the integrated power supply
  • No mains power required costs savings doe to lower wiring effort
  • No mains interference
  • Low power loss no unnecessary heating in the enclosure
  • Protective separation according to EN 61140: protection of the maintenance staff and subsequent devices against excessively high voltages
  • HART® transmission: bi-directional point-to-point transmission of digital data according to the HART® specification*
  • EMC tested RFI suppressed and surge proof: reliable operation even with electromagnetic interference
  • Maximum reliability: no maintenance work so the associated costs are not incurred
  • 5 year warranty

The passive WG 25 repeater power supply is loop-powered. It is used for galvanic hazardous-area separation of a 2-wire supply line and transmits both 4 … 20 mA and HART® signals in both directions. With a voltage drop of just 4.2 V, the WG 25 uses the supply optimally so that all common 2-wire transmitters can be connected. Compared with active repeater power supplies, it has considerable price and reliability advantages. Multi-channel systems require only one central, safe-area power supply that does not even need protective separation. *HART® is a registered trademark of the HART Communication Foundation




Catalog Excerpts

Catalog Excerpt - WG 25

Catalog Excerpt (en)

4396 |  WG 25
Product Description | Specifications | Product Range
PDF (file size: 0.93 MB)


Manual - WG 25

Manual (en)

4400 |  WG 25
PDF (file size: 0.83 MB)

Certificates / Approvals

EU Declaration of Conformity - WG 25

EU Declaration of Conformity (en)

13688 |  WG 25 A7, Opt. ... & IsoTrans 37 A7, Opt. ...
Document No. EU180611A | 2018-06-11
PDF (file size: 1.59 MB)
EC-Type-Examination Certificate - WG 25

EC-Type-Examination Certificate (en)

11848 |  IsoTrans 37 A7, WG 25 A7
PTB 02 ATEX 2063 | 2018-04-24
PDF (file size: 3.59 MB)