What selective RCD to choose?
In the apartment shield, all groups are protected by difavtomatami. What selective ouzo to put in the floor board after the counter, if there is a 63A machine before the counter. 3 phases.
Hello! Selective RCDs must be selected based on the requirements and leaks of your line. Here, in contrast to the fire protection RCD, the selectivity is achieved primarily due to the temporary exposure, and only then due to the rated leakage current.
Choose according to standard recommendations, the rated current with the same or one step higher than the rated current of the input circuit breaker, and select the trip current greater than or equal to the larger of the trip currents of the group RCDs, that is, if you have the largest RCD current in the shield 30 mA, then the selective need to be set with a current of not less, but more than that.
For example, an RCD type S 100 mA, 63-80A 4 poles is suitable. IEK has such: VD1-63S 4P 63A 100mA. If you do not find models with type S - put the usual, but at 100-300 mA. Not less.
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