Line resistance
The line resistance counteracts a short-circuit current. With low-power voltage sources, a short-circuit current can be limited by the line resistance in such a way that a protective device no longer recognises this current as a short-circuit current. For example, the upper tripping limit of miniature circuit-breakers with a C characteristic is significantly higher than the rated current. For this reason, these protective devices in particular may switch off with a delay in the event of a short circuit. (All data without guarantee)
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