Relay - Function: An electromechanical device that switches a load circuit when a control signal is received, providing electrical isolation between control and load sides. - Why you need it: Enables safe control of higher current devices, protects control electronics, and reduces wiring complexity by consolidating switching into a single component. - Key attributes: - Compatibility: suitable for standard control systems with common coil voltages and contact configurations; verify model specs for exact values. - Size: compact form factor for PCB mounting or panel installation. - Material: durable housing and copper alloy contacts with coil insulation to meet industry standards. - Performance: reliable actuation, low contact resistance, long service life under typical switching duties. - Use scenarios: 1) Home automation projects to control lighting or appliances from a microcontroller. 2) Industrial control panels to switch motors, solenoids, or heaters while isolating control electronics. 3) Prototyping and educational experiments to demonstrate switching circuits. - Note: For exact coil voltage, contact rating and form factor refer to the model specific datasheet.