The ELR-3F has two setting ranges (current 0,03 or 0,5A / time 0,02 or 0,5 seconds) allow to select the tripping current, in order that the contact voltage values are maintained below 50V as required by the CEI 64-8Standard.
This is also the suitable answer in many of the industrial requirements for a proper selectivity, whenever there are other ELR’s or/and RCD’s downstream or upstream in the line to be protected.
Its interruption brings along the immediate trip of the protection. This allows to identify the anomaly, without waiting to the periodical control, made with the Test push button.
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