MRD Rail Technologies
(+61) 7 3821 5151
MRD Products

Products by MRD

Earth Insulation


Remote Earth
Insulation Monitoring

Multi-channel EarthLogger monitors up to 4 different busbars, significantly reducing the likelihood of failure or accidents due to insulation faults


Track the cause of fault using fault time log


Flexible channels monitor AC or DC busbars


Remote monitoring and logging of earth insulation


Detect and remove faults before problems occur


View Test Results on Screen

EarthLogger 100% is designed and manufactured in​ Australia

Despite all the safety built into electrical systems, failures can and do occur

The EarthLogger is designed to be used in unearthed IT systems where high reliability of the supply is required. Eg. railway, industrial, marine and power applications.

Insulation resistance is the determining factor with respect to personal, equipment and fire safety

The insulation resistance on new installations and electrical equipment is usually very good. Over time, however, operation causes an inevitable reduction in insulation resistance.

This degradation is monitored and safety is maintained through the use of MRD’s EarthLogger.

3D Viewer

Click & Drag for 360 Degree View (Double-click for full screen mode

EarthLogger serves as an early warning system by providing notifications when the impedance between an active phase conductor and earth drops below a set value

The insulation resistance is logged and data can be viewed remotely giving operators the information they need in order to take appropriate maintenance measures.

EarthLogger Frequently Asked Questions

Yes, the EarthLogger comes with a sunlight readable OLED display
EarthLogger has the ability to remotly monitor via Ethernet or 3G/4G modem

Notifications from EarthLogger can be configured via SMS and E-Mail

No. The EarthLogger internally logs insulation resistance and busbar voltage

AC Supply Voltage

  • Supply Voltage 100 – 240V AC
  • Frequency Range 50 – 60 Hz


DC Supply Voltage

  • Supply Voltage 120 – 370V DC

Our products are trusted by

RelayDoc is a product of MRD Rail Technologies

Who are we?

MRD Rail Technologies have been a specialist in the design and manufacture of condition monitoring products since 1991. We have supplied rail networks around the globe with cutting-edge solutions which were designed and manufactured in-house. This allows us a lot of freedom to be creative and innovate, while carefully controlling important factors like cost, quality and lead times.

With an invested focus in the field of asset condition monitoring, our products include rail signalling test and measurement equipment, automatic relay testers, passenger information systems, AWS equipment and more.

The MRD Team have passion and expertise for developing innovative hardware and software solutions that change the way the railway industry approaches network reliability and maintenance. Our products make it simpler for remote operators to monitor the condition of crucial track machinery and obtain the information they need to make timely maintenance decisions based on both exact,and predicted, condition.

Industries that benefit from the use of MRD products

Multi-Channel Remote Earth Insulation Monitoring

MRD EarthLogger

EarthLogger serves as an early warning system by providing notifications when the impedance between an active phase conductor and earth drops below a set value.


Phone (+61) 7 3821 5151


235 South Street, Cleveland, Queensland 4160 Australia
MON-FRI 09:00 - 17:00,