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What is tripping threshold voltage limit and tripping time limit for Over voltage release (MSU, Ref A9N26500) Acti9 MCB ?

Please find the below details for triping tripping threshold voltage limit and tripping time limit for Over voltage release (MSU) acti9 MCB  :-
Threshold tripping voltage and tripping time 
275 V / 3...15 s
300 V / 1...5 s
350 V / 0.25...0.75 s
400 V / 0.07...0.2 s
255 V/ No tripping
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