Dold Industries Ltd

11 Hamberts Rd. Blackall Ind. Estate
South Woodham Ferrers
GB-Essex, CM3 5UW

Insulation fault locator

RR 5887


Auxiliary voltage


  • 0067691
  • RR5887.12/010 AC/DC85-230V
The locating current injector RR 5886 in connection with the insulation fault locator RR 5887... more

Product description

The locating current injector RR 5886 in connection with the insulation fault locator RR 5887 monitors and localises insulation faults in complex AC/DC networks (IT systems). The external current transformers work independently of each other. They are simply connected to the measuring channels of the insulation fault locator RR 5887 and are calibrated by it. The number of measuring channels is increased by combining several insulation fault locators via a RS-485 bus connection. The search for insulation faults in extensive networks can be refined in this manner. Two different alarm levels facilitate the timely detection of a dangerous insulation state. The devices are operated easily and intuitively thanks to automatic balancing and a clear layout of the setting elements. The early detection and localisation of insulations faults permits their quick and targeted correction. As user you will benefit from the operating reliability and high availability of your system.

Technical specifications

Nominal voltage IT system: DC, AC, 3AC 21 - 500 V
Type: RR 5887
Width: 105 mm
Operating mode: Slave
Operating voltage AC/DC: 24 - 80, 85 - 230 V
Bus interface: Modbus RTU, RS-485
Failure storage: +


  • Quick correction of insulation faults in complex power networks
  • Universal auxiliary voltage range
  • Easy operation


  • Insulation troubleshooting in AC, DC and AC/DC networks (IT systems) in connection with the locating current injector RR 5886 according to DIN EN 61557-9 (VDE 0413-9):2009 and DIN EN 61557-1 (VDE 0413-1)
  • Insulation coordination according to IEC 60664-1
  • Connection of max. 4 or 8 measuring current transformers depending on the design
  • RS-485 bus connection to synchronise the test current analysis and optionally for the connection to the Modbus RTU field bus
  • Status output of insulation fault detection via external switching output
  • Memory characteristics adjustable via bridge X1-X2
  • Collective signalling relay to output preliminary warning and alarm states
  • Pushbutton for manual reset of alarm states as well as testing of measuring current transformers and their calibration
  • Terminal connection for the storage of alarm states
  • Width: 105 mm