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What is the difference between a shunt trip and shunt close device on a Masterpact breaker?

Issue:  
What is the difference between a shunt trip and shunt close module on a Masterpact NW or NT breaker?  

Product Line:  
Power circuit breakers

Environment:  
Masterpact NT and NW circuit breakers

Resolution:  
There is no difference in the accessory and they are marked to be used as either.  Their function is determined by which position they occupy in the breaker.  See attached instruction bulletin 48049-146-01 for more information.  
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