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What is 5906 suffix on Legacy circuit breaker?

What is the -5906 suffix on Legacy circuit breakers?

Product Line:
Square D Legacy Molded Case Circuit Breakers

Products sold and used in the North America

Need to determine accessory to cross or purchase new breaker

5906 suffix is a combination suffix for a 2A/2B alarm switch with gold flash contacts in the right pole (-1027 suffix) and a 24 Vdc shunt trip in the left pole (-1286 suffix).

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