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What are possible reasons for a pair of cable-interlocked Masterpact NW circuit breakers to have trouble with transferring?

The most likely cause relates to the adjustment of the cables.  The interlocks should be inspected for tolerances at the attachment points and ensure minimum bend radii are maintained per the instruction bulletin for the cable interlocks.  Over time, dusty, corrosive, or wet environments can also impact the free movement of cables within the sheath and inhibit transfers.

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