A crucial component in irrigation and water pumping systems, the pump start relay (PSR) acts as an intermediary between the controller and the pump itself. It receives a low-voltage signal from the controller and then switches on a higher-voltage circuit, enabling the pump to start. The proper installation and troubleshooting of a PSR heavily rely on understanding its wiring, hence the significance of a pump start relay wiring diagram. This diagram serves as a visual roadmap for connecting the various components involved, ensuring the system operates safely and efficiently.