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What is the risk of reverse feeding Compact NSX HB1/HB2 MCCB?

For "HB" Compact NSX MCCBs, it is mandatory to supply the circuit breaker via its upstream. The high breaking performance cannot be reached if the "HB" NSX MCCB was reverse fed because we risk arcing between poles. Thus, restrict reverse feeding for this MCCB as illustrated in the attached Compact NSX 2016 catalogue extract.