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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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