What safety mechanism is often found with machine operation options that involve risk of entrapment?

The safety mechanism that is commonly associated with machine operation options involving a risk of entrapment is the interlock. An interlock functions as a critical safety device that prevents the machine from operating unless certain conditions are met. For example, if a protective guard is opened or removed, the interlock will cause the machine to stop or not start, ensuring that operators are not exposed to hazards while interacting with the machine.

Interlocks are crucial in environments where there is a significant risk of entrapment, as they help protect workers by ensuring that machinery cannot be engaged when it poses a danger to them. By automatically disabling the machine in situations where safety is compromised, interlocks play a vital role in maintaining a safe working environment.

The other options, while related to machine safety, do not specifically address the risk of entrapment in the same manner. An awareness barrier might raise operator awareness of hazards but does not prevent operation. An overrun switch is typically used to stop a machine that has exceeded its normal operating parameters, and adjustable members refer to components that can be modified or repositioned but do not inherently provide a safety function against entrapment.