Normally Closed (NC): This contact remains closed until the relay is activated. Common (COM): This symbol represents the terminal that moves between the NO and NC contacts. Diode: Sometimes included in relay diagrams to protect against voltage spikes, depicted as a. Relay terminals are often marked with specific designations that indicate their function. Relays typically have four to five terminals: the coil terminals (commonly labeled 85 and 86), the common terminal (30), the normally open (NO) terminal (87), and sometimes the normally closed (NC) terminal (87a). The coil terminals activate the relay, the common terminal serves as a switch between. A relay is a four-terminal electrical switch, used to control any electrical circuit with an independent low-power signal and also to control various electrical circuits with a single signal. So what happens is, when we switch ON or OFF this electromagnet using a DC power then that spring-loaded system is pulled or released accordingly by.
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