DC-safe: Insulation resistance monitoring

Our DC-safe® technology measures the insulation resistance in direct current (DC) systems on a regular basis and triggers an alarm when the resistance drops beneath a previously defined value.


Beyond mere fault detection, DC-safe® also calculates the actual value of the insulation resistance, which enables to monitor it and take preventive action before an actual problem occurs.

In case a problem does occur, DC-safe® pinpoints the location where the insulation failure occurred, enabling an efficient service intervention. This is especially important since insulation failures are often intermittent and notoriously hard to locate.


In most DC systems such as electrical storage systems it is vital to isolate parts of the system from each other (s.a. the housing and the circuitry). This means that the resistance between these parts needs to be so high that only negligible current will flow between them. When the insulation resistance drops below a certain value, a so-called insulation failure occurs. Our DC-safe technology helps to avoid this scenario.

The DC-safe® technology has proven its value on more than 250 hybrid buses all over Europe.

DC-safe® is patented (EP1265076).

It can be implemented in a very compact way in a micro-controller using very few external components.

Contact us!

Sofie Ignoul
Business and Relationship Development at EnergyVille/VITO

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