What is fed from the generator side of the Generator Circuit Breaker (GCB)?

The correct answer identifies the specific electrical loads that are supplied by the generator side of the Generator Circuit Breaker (GCB). The generator side of the GCB is responsible for managing power distribution, and it typically supplies power to essential operational components such as cooling fans, casualty power systems, and the seawater pump. These components are critical for maintaining the operational integrity of the generator and ensuring that cooling and auxiliary systems function properly.

Cooling fans are vital for regulating the temperature of the generator, preventing overheating, and ensuring efficient operation. Casualty power refers to the backup power supply that may be needed in emergencies or system failures to maintain critical operations. The seawater pump is essential for cooling the generator in marine environments, where seawater is often used to dissipate heat.

In contrast, the other options focus on different aspects of power management. Emergency power only is not a complete representation of the loads fed from the generator side. The main grid supply relates more to the output of the generator to the electrical grid, rather than components directly fed from the generator side. Control panel signals are necessary for operation and monitoring but do not represent a load in the way that the essential cooling and auxiliary equipment do.