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Will KA breakers accept two wires per phase?

No, generally, KA breakers can accept only one wire per phase. Power distribution connector, cat. no. PDC3KA20, can be applied on LOAD side only of KAL breakers (but not I-Line circuit breakers), and it can accommodate qty (2) #14-1 Cu only or (1) #12 - 2/0 Cu only. Power distribution connectors are designed for UL508 Industrial control application and for UL19951995/CSA C22.2 No. 236 heating and cooling equipment. Available lugs are in Circuit Breaker section of Digest.

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