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    What is the voltage tolerance level at nominal voltage for the electrical auxiliaries used in Low Voltage Circuit Breakers

    The voltage tolerance level for the electrical auxiliaries (example: undervoltage release(Mn), shunt coil(Mx)) used in Low Voltage Circuit Breakers is defined as per the IEC 60947-2 standard.
     
    The tolerance level defined by IEC60947-2 is 0.85% for minimum nominal voltage (Un) and 1.1% for maximum nominal voltage (Un).
     
    Example: For Un = 230/240V, Minimum tolerance Level is (0.85% of 230V AC) = 195.5V, Maximum tolerance Level is (1.1% of 240V AC) = 264V.

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