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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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