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What does TF mean on the end of an F frame catalog number?

What is suffix TF?
Product Line:
Legacy Molded Circuit Breakers
Legacy F-frame Circuit Breakers

Circuit breaker replacement
The breaker has AL100TF lugs on it. These lugs are used on the off end of the breaker when the off end is the load end. The wire binding screw and the normal wire location are reversed for top feed.
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