What would cause the movable contacts to remain partially blocked and not open fully?
Common areas of wear included: broken or cracked contact carrier, debris in the contactor causing loss of freedom of movement, or welded contact(s).
For 185 and 225 ampere devices, the movable contacts may have been overtightened during manufacturing. This was only reported as a POSSIBLE issue on devices with the manufacturing date code of 0118 thorugh and including 0146 (or April 29th through December 1st, 2001). Refer to notification letter sent out for details on problem, products affected, and how to check.