RXISK 2H/RAISK is used as a short-circuit protection for generators and also for other network applications, where a more sensitive short-circuit function is required compared to a basic overcurrent function.
The voltage restraint function is linear between a set voltage value and 25 % of that setting. The set overcurrent operating value is then reduced linearly with the reduced voltage as a result of the fault. The resulting fault current sensitivity is thus a function of the measured input voltage to the relay.
Standard IEC inverse characteristics as well as fixed time delays may be selected via the switches on the front of the relay.