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    How does a thermal-magnetic trip unit work?

    Issue:
    How does a thermal-magnetic trip unit work in a circuit breaker?

    Product Line:
    Circuit Breakers

    Environment:
    Miniature and Molded Case Thermal-Magnetic Circuit Breakers

    Resolution:
    Thermal-magnetic trip units trip under short circuit conditions instantaneously, with no intentional delay. Below the instantaneous trip current, they have a delay established to protect conductors while allowing momentary current surges such as for motor starting and transformer inrush. In some cases they have adjustable instantaneous trip current settings.

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