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What is the difference in earth fault current internal measurement between 56517 and 56173?

56517 Earth-leakage relay RH197M - 0.03..30 A - 0..4.5 s - 240 V
-7 … 7 % is the accuracy of measurement between leakage current to earth detected by sensor and the current measured by the product.

56173 : Earth-leakage relay RH99M with manual reset - 0.03..30 A - 0..4.5 s - 240 V
80..100% is the detection range of a faulty current
For a particular Idn, the product will detect a fault if the current is between 80 and 100% of Idn

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