What is the primary function of relays in elevator systems?

Relays serve a crucial role in elevator systems by providing electrical isolation. This function is important for various reasons, including safety and control. When a relay operates, it can open or close circuits without directly exposing one part of the system to another, thus preventing potential electrical faults or hazardous situations.

Electrical isolation means that the control circuit can safely trigger larger power circuits to move the elevator, without the risk of high voltage affecting the control systems or operators. This separation enhances the reliability and safety of the elevator operation.

The other options, while relevant to electrical systems, do not directly pertain to the primary function of relays within the context of elevators. Relays do not primarily increase speed, convert AC to DC, or serve as a power source; their main focus is to act as a switch that isolates sections of the electrical system for improved operation and safety.