Assertion: relay's switch | /r/HasProperty | needed
Facets:
value: for a separate switch ground wire
type: PURPOSE
Source sentences:
text: The switch can pass more current than is needed to energize the electro-magnet, so relays act as digital amplifiers.
text: This type of circuit is useful when the switch can be grounded to the chassis of the vehicle and there is no need for a separate Switch ground wire.