What does suffix 1042 indicate on a circuit breaker?

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What does suffix 1042 indicate on a legacy circuit breaker?

Issue:
What is the suffix for the 12 Vac/dc or 24 Vac/dc shunt trip on QO/QOB breakers?

Product Line:
Miniature Circuit Breakers

Resolution:
A molded case circuit breaker with a 1042 suffix has a 24 Vac shunt trip in the left pole. A 1042 suffix on the QO breakers is a shunt trip rated for 24 Vac/dc