What are two special features required for an AC power transfer switch?

The requirement for power transfer switches, particularly in AC systems, involves ensuring safe and efficient switching between power sources, such as switching from shore power to generator power. The combination of break-before-make and overcurrent protection features is fundamental for several reasons.

Break-before-make ensures that the connection to the current source is interrupted entirely before establishing a new connection to the alternate source. This prevents any overlap or shorts between both power sources, which can lead to severe damage to equipment, potential hazards like electrical shocks, or fires.

Overcurrent protection is crucial as it safeguards the system from damage due to excessive current that may occur during a fault condition. It ensures that if the current exceeds the safe operating level, the system will disconnect to prevent overheating, potential fire hazards, and equipment failure.

In contrast, the other alternatives address characteristics that may not align specifically with the core safety and operational efficiency standards required for AC power transfer switches. For example, while features like manual operation or automation may be desirable, they do not inherently provide the necessary electrical safety precautions that break-before-make and overcurrent protection offer. Similarly, while water resistance is beneficial for outdoor applications, it does not directly pertain to the fundamental function of preventing simultaneous electrical connections or protecting the system from