Relay
Relays are electrical devices/components that are operated via electric current. They are usually electromagnetic, can be switched remotely, and typically have two positions. A control circuit is used for activation and additional circuits can be switched as required.
Relay applications
- Simultaneous control of several circuits by a single control circuit
- Control of a high-power circuit via a low-power control circuit
- Galvanic isolation of the controlling circuit from the circuit to be switched
Normally-open (NO) contacts connect the circuit when the relay is activated; normally-closed (NC) contacts disconnect the circuit when the relay is activated.
