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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 device on a Masterpact breaker?

Product Line:
Masterpact NT NW

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. 
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