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A device that detect DC undercurrent (> 400A) for a rectifier during maximum time reach to 30 sec

The DC Undercurrent relay reference below will be closer to the requirement given  But the time delay = 0.5 to 25 sec 

1. DUCRDHALLB ---> electronic DC undercurrent relay with Hall-sensor - 5..480 A - 24 V AC/DC 

2. DUCRDHALLZ7 ---> electronic DC undercurrent relay with Hall-sensor - 5..480 A - 85..250 V AC/DC 

The datasheet are attached herewith for you reference. You  can  check and confirm the suitability of this reference for their application requirement.
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