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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

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.

Schneider Electric USA

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