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On an I-Line circuit breaker, (for example an LA36400MT), what does the `MT` suffix indicate?

What is the meaning of the suffix -MT on an I line circuit breaker?  

Product line:  
Molded case circuit breakers

I-line legacy circuit breakers 

This is an I-line breaker and an `MT` suffix indicates that the Plug-on Shroud is located on the `OFF` end of the breaker.  
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