Glossary
Insulation monitor
What is Insulation monitor?
A device that continuously monitors the insulation resistance of a system and reports when it falls below a limit — that is, before a fault leads to tripping.
What matters about Insulation monitor in practice?
The difference from the residual current device: that reacts when current is already flowing. The insulation monitor warns beforehand, when the insulation deteriorates — due to moisture, ageing or a chafe point.
On board it makes sense mainly in systems with an unearthed network and for equipment with high availability requirements. In the usual recreational craft installation, residual current protection takes over this task.
Related terms
Still unclear?
We are happy to explain it for your specific case.