Hello everyone! I hope you are doing well. In this tutorial, we will study the relay from its basic construction to practical selection and control. A relay allows one electrical circuit to operate contacts in another circuit. This makes it useful when a low-power controller must switch a different voltage, a larger load or an electrically isolated circuit. Libraries Relay Simulation Libraries Latest library: Relay Module Library for Proteus V1.0 (October 2026) Other motor drivers: L298 · L9110S · TB6612FNG · BTS7960 · A4988 / DRV8825 · 28BYJ-48 + ULN2003 · PCA9685 Servo · 30A Brushless ESC · TB6600 Stepper Driver Helping Tools Serial Monitor Advance : a serial terminal window for the UART of your board Serial Monitor Expert : the serial monitor with extra debugging tools LCD Library for P ...