Intercom Vocabulary



an electrically operated switch. Commonly, these relays are normally open (NO) contacts, which mean they connect the circuit when the relay is activated. The circuit is disconnected when the relay is inactive. It is also called a Form A contact of “make” contact. in audio electronics, these relays are of the dry contact type. Dry contact refers to a contact of a relay which does not make or break a current – they simply turn something on or off.

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