CIRCUTOR CBS8 (Available until stocks) - Manual (Page 23)

----- Relay Station CBS-8 -------- --- Page No. 22
5.1.2.2.- Earth leakage mode:
For equipment only used for earth leakage measurement, it will only be
necessary to set the trip threshold.
Trip threshold.
The current at which it will trip must be set (operating relay).
Channels used for earth leakage measurement must be set with the maximum
current to be measured. This value is very important because if an extremely high
value is set then accuracy will be lost and if a value lower than the measured current
is set, the input will be saturated and the measurement will be incorrect.
The value set must be one of those predefined values according to the toroid
used and the function mode: