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What does the suffix 1042 mean?

A molded case circuit breaker with a 1042 suffix has 24Vac shunt trip in the left pole. Suffix 1018 would have the shunt trip in the right pole.
However, a 1042 suffix on the QO breakers is a shunt trip rated for 24 Vac/dc

CTA-ID : 2031257
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