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What is Momentary vs Interrupting Duty Explained about?

Momentary duty refers to the maximum current a circuit breaker can withstand without interrupting the current, including being able to close on a faulty circuit. Interrupting duty is the current it can safely interrupt, which may occur several cycles after the fault to allow downstream devices to open as well, so the interrupting current value is typically lower than the momentary duty rating. There are also some differences in how fault currents and duties are calculated between ANSI and IEC standards.

Author

Arnel Pascual Laquindanum

Language

EN