• Insulation relay for non-grounded live DC systems
  • Self powered from any input from 12 to 60VDC
  • Both for battery and power generated DC networks
  • "SEV" measuring principle
  • For use in land, marine and offshore installations
The digitally controlled low cost KRM169E is self powered and uses the Megacon “SEV” insulation measuring principle to measure the insulation in live non-grounded DC systems.

The resultant insulation level is measured between the complete galvanically interconnected DC network and its protective earth. The signals flow to ground via the path of the insulation fault, the level of flow expresses the insulation resistance, the direction of flow expresses the fault polarity.

The high measuring accuracy and trip repeatability of the KRM169E is not influenced by variation of the DC voltage level (including imposed AC ripple) between 12 and 60VDC, or by symmetrical earth faults. The measuring method does not support corrosion.

Alarm relay output
The alarm relay is fail-safe and energises when powered. The relay trip level is adjustable between 5 and 110kohm with a fixed alarm delay of 3 seconds.

Remove the lower terminal lid for access to the trip level adjustment. The relay will automatically return to the normal state when the insulation level is above the trip level.

Faulty polarity "Pathfinder" function
The LED continuously shows the condition of the insulation:
  • Normal (High Insulation): Steady Green LED
  • Positive fault: Flashing Red LED 
  • Negative fault: Steady Red LED


KRM169D - DC Insulation Trip RelayKRM169D
  • Insulation relay for non grounded  DC systems
  • Both for battery and power generated DC networks
  • "SEV" measuring principle
KRM169D measures the insulation, directly in kohms, of non-earthed DC systems.

The standard 24VDC instrument has a 100kohms range with a trip level of 25kohms.

Trip levels vary depending on monitored nominal voltage.

The trip level is factory set and will operate after a delay of approximately four seconds.
Relays are fail-safe and energise when powered.

Reset the relays by operating the internal reset button or an external reset (pulse).

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