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Manual Guidelines for Contactor inspection and ... - ABB· PDF file1SFC101044M0201, rev B | ABB Contactor Manual 11 Voltage drop during start up of the motor Voltage drop to less than 85 % of nominal voltage for 5 to 10 ms can be enough for the contactor to start opening. Also, other disturbances in the control voltage such as poor relay contacts or too small control transformer/power supply could be

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