Insulation Monitor ISOMETER® iso175
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The device reliably detects insulation faults, significantly contributing to both electrical safety and the availability of the electrical system. A key success factor is the use of an active, patented measurement method, which allows insulation monitoring even when the high-voltage system is de-energised, prior to the connection of the energy storage system.
More at https://www.bender.de/en/products/insulation-monitoring/isometer-iso175/