What is the function of the A2B device on a crane?

The A2B device, commonly referred to in the context of crane operations, serves a crucial safety function. Its primary role is to monitor the interaction between the load and the hoist system. When the device's weight touches the hoist hook assembly, it triggers an automatic stop function. This mechanism is essential for preventing overloading and ensuring the safe operation of the crane by avoiding conditions that could lead to accidents or mechanical failure. This safety feature aligns with broader safety protocols in crane operation, emphasizing the importance of preventing load-related incidents.

In contrast, the other options do not accurately reflect the purpose of the A2B device. It does not increase lifting capacity, as that is determined by the crane's design and specifications. Similarly, the A2B device is not intended to lift loads higher than normal; its focus is on safety rather than performance enhancement. Finally, the device does not enhance crane mobility, since mobility refers to the ability of the crane to move rather than its load-handling capabilities. The emphasis of the A2B device remains firmly on maintaining operational safety and preventing potential hazards.