Innovative technologies for safe handling of electrical power to achieve high availability

We offer you first-class quality and safety combined with global service and every support in resolving your monitoring problems.

WR Series

The highly sensitive WR…S series measuring current transformers of rectangular type convert AC currents into evaluable measurement signals, in combination with RCM and RCMS series ground-fault monitors and evaluators. In addition, the measuring current transformers can be used in combination with ground-fault location systems (EDS) for IT systems. They are designed to measure the locating current generated by a PGH locating current injector or an ISOMETER® IRDH. In combination with EDS series ground-fault locators the test current is converted into evaluable signals. The WR…SP series measuring current transformers feature an integrated screening. This screening is intended to avoid false tripping of connected RCM… or EDS… devices, when high load currents or inrush currents occur in the system being monitored. WR…SP series measuring current transformers are particularly suitable for use in busbar systems and are designed for load currents ≥ 500 A. Connection to the respective device is via a two-wire cable.


  • For RCMS460/490 residual current monitoring systems
  • For RCM420 residual current monitors
  • For EDS440 insulation fault locators
  • For EDS460/490 insulation fault locators


  • The WR…SP measuring current transformers are particularly suitable for use in busbar systems. This series is to be used for load currents ≥ 500 A.
  • for insulation fault locators (EDS)

Downloads for WR Series

Datasheets WR70x175S(P)…WR200x500S(P) 430.5 KB EN2021/05/12 13:36:3012.05.2021 13:36:30D00076
Manuals WR70x175S(P)…WR200x500S(P) 322.2 KB EN2019/12/13 10:25:4813.12.2019 10:25:48D00076

WR Series Variants

TypeInternal diameterArt. No.
WR70x175S70 x 175 mmB911738
WR115x305S115 x 305 mmB911739
WR150x350S150 x 350 mmB911740
WR200x500S200 x 500 mmB911763
WR70x175SP70 x 175 mmB911790
WR115x305SP115 x 305 mmB911791
WR150x350SP150 x 350 mmB911792
WR200x500SP200 x 500 mmB911793