Retrofit without changes at the switch gear Installation at all kinds of HR- and LRM-interfaces according to IEC 61243-5 Optional: retrofit for damaged HR-interfaces If the interface does not meet the requirements of IEC 61243-5 No battery required For voltage detecting and self test no external power supply or battery is required Completely free of maintenance The device performs a permanent online insulation measuring Inherent safety The CAPDIS-PI includes a self test which offers inherent safety, no external test device is required Integrated 3-phase test point Acc. to the LR-specification in IEC 61243-5. The test point can be used for phase comparison and phase sequence test. Integrated U0-interface For easy installation of earth-fault direction relay IKI-EDI-W or partial discharge monitoring.