The measuring range can be extended up to 690 V AC and 1000 V DC by using the coupling unit CM-IVN. It can be configured to the requirements of the applications and therefore used multi-functional.
ABB, Contactor 
ABB – CM-IWN.1S-1SVR750660R0200
1SVR750660R0200
CM-IWN.1S Insulation monitoring relay 2c/o, 1-100kOhm,2-200kOhm, 24-240VAC/DC
The CM-IWN.1S serves to monitor insulation resistance in accordance with IEC 61557-8 in unearthed IT AC systems, IT AC systems with galvanically connected DC circuits, or unearthed IT DC systems with a voltage up to 400 V AC and 600 V DC.
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