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How does a thermal-magnetic trip unit work?

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

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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