What control in an automatic transfer switch sends a signal to transfer the load to generator power?

The transfer control in an automatic transfer switch is the system responsible for detecting power outages from the utility source and subsequently signaling the switch to transfer the load to the backup generator. This control ensures that the transition from utility power to generator power occurs smoothly and without manual intervention.

When the utility power fails or drops below a predetermined threshold, the transfer control activates the process to switch over the electrical load. It manages the timing and sequence of the switch operation to prevent any damage to the electrical system and provides a seamless transition, allowing for the essential power supply to remain uninterrupted during an outage.

The other controls listed, while potentially important in specific contexts, do not directly initiate the transfer of the load to generator power. Load control relates more to managing how much power is being drawn, emergency control may include triggering alarms or alerts, and generator control pertains to managing the generator's operational aspects rather than the switching mechanism itself.