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For the relay RM35UB330, When we measure 220VAC, 3 phase & adjust the voltage potentiometer on 20%, the fault LED doesn't lit

For RM35UB330, the measured voltage is 220..480 VAC but the supply voltage limits is 194...528 VAC

So when the potentiometer is adjusted to 20% of 220 Volts, it is below the supply voltage limit (176 VAC) , that's why is not considered as a fault by the relay & it is not able to detect it

In technical terms: This voltage value is not sufficient to energize the coil of the relay

Kindly find the product data sheet as attached
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