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This FAQ has been written for NEAL (North East Africa and Levant) region. If you are looking for information for another region, please select the correct country from the top-left dropdown in the page and 'Navigate to Browse FAQs' in the Support menu.
What is the function of the terminal number B2 & B4 for compact NSX?
B4 (auto-power supply) is a permanent power supply to help to finish the action of opening (and internal spring compression), in case of short pulse on BP of opening command.

B2 is the reset of the motor mechanism in case of tripping. The contact SDE is add to forbidden
the reset of the motor mechanism in case of tripping of the circuit breaker due to electrical fault (trip from trip unit...)

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