WITT EPM 4 – Earth Potential Monitoring

WITT EPM 4 – Earth Potential Monitoring
Address: WITT Solutions GmbH
Dyrotzer Ring 3
14641 Wustermark
Phone: +49 (33234) 2433 12 Connect: Website: View website Contact: Contact supplier View: View supplier Download: Download

Witt Solutions GmbH

The WITT EPM 4 measurement device monitors the potentials of the connected grounds and evaluates the occurring voltages (see technical specifications). This device does not need any auxiliary power supply; the electrical power is supplied by the monitored input voltage.


While operating DC railways with the running rail as return conductor various ground resistances generate voltages that might be dangerous for humans or buildings. One of the measures to protect humans from impermissible contact voltages is the temporary shortcircuit of the various grounding systems according to DIN EN 50122-1. The EPM 4 monitors the relevant potentials and delivers reports for further actions.


The voltage between the earths or return conductor respectively that are to be monitored is continuously measured. By exceeding the threshold setting a switching command is given via a potential-free changeover for the activation of further devices such as an earth shortcircuiting device or an isolator.

Download the full PDF here.

WITT Solutions GmbH is an owner-managed, medium-sized high-tech company that develops and sells measuring and testing technology for monitoring power supply and superstructure systems for rail-bound traffic. Our professional power monitor products monitor e.g. earthing potentials, cable faults and contact voltages and are I4.0 capable as well as Railway Federal Office(EBA) approved products. With our innovative rail infrastructure monitoring systems, we are cooperation partners of renowned companies.


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