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What is the -5251 suffix on QOU breakers?

QOU breakers

Suffix 5251 was a threaded mounting foot used on 10-60 A QOU breakers, and  is similar to the 3100 suffix that we use now.
It is obsolete, and the customer should use the 3100 suffix or order the standard mounting feet (QOUMF1 for single pole, QOUMF2 for 2 pole, or QOUMF3 for 3 pole).
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