What is the meaning of the suffix Z at the end of a circuit breaker catalog number? (example QOB3100Z)
The suffix Z as the last character simply means that the standard breaker was part of an internal bulk pack shipment from one Schneider plant to another.
If an existing breaker needs replacing that has a Z as the last character of the catalog number, simply order the breaker without the Z. Example:
Existing breaker is QOB3100Z
Replacement breaker is QOB3100 (without the Z)