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Need to identify TX suffix on end of Powerpact breaker catalog number

What is suffix TX on the suffix of an H or J-frame breaker?

Product Line:
Powerpact H and J frame molded case circuit breakers

Products sold and used in the United States

Need to identify suffix to build breaker in selector
TX suffix indicates metric terminal nuts factory installed on the ON end of the breaker. Can also field install. Use:

S37426 for H-frame (contains two terminal nuts)
S37428 for J-frame (contains two terminal nuts)

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