Assertion: circuit breaker's switch | /r/HasProperty | opened
Facets:
Source sentences:
text: This means that under high loads or voltages, a dangerous arc can form when the switch is opened or closed.
text: For example, if only one of two sources of supply are permitted to be connected at a given time, the interlock scheme may require that the first switch must be opened to release a key that will allow closing the second switch.