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    What is the response time of the shunt trip and shunt close for the Masterpact NW?

    Issue:
    Response time of the shunt trip and shunt close for the Masterpact NW and NT

    Product Line:
    Insulated Case Circuit Breakers

    Environment:  
    Masterpact NT and NW

    Resolution:
    OPEN:
    Circuit Breaker OPEN time at nominal voltage is: 50 ms ±10 ms (40ms to 60 ms).
    Shunt trip (MX) and shunt close (XF) circuits must be energized for minimum of 200 ms.

    CLOSE:
    Circuit breaker CLOSE time:at nominal voltage is:
    NW 4000 A and smaller: 70 ms ±10
    NW > 4000 A: 80 ms ±10
    55 ms for the Masterpact NT

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