What feature does a removable mechanical guard have that a fixed mechanical guard lacks?

A removable mechanical guard typically includes a mechanical or machine interlock feature that is not present in fixed guards. This interlock is a safety mechanism that prevents machines from operating when the guard is not securely in place. The presence of an interlock ensures that operators cannot access hazardous areas while the machinery is in operation, thereby enhancing safety.

Fixed guards, on the other hand, are permanently attached and do not offer the same level of access control provided by a removable guard with an interlock. While fixed guards are beneficial for protecting against hazards continuously, they lack the ability to temporarily disengage the safety feature while ensuring that machinery remains inoperative until the guard is reattached.

In terms of the other options, while a removable guard might be easier to install or provide visibility and potentially be durable, these traits do not differentiate its functionality in the context of safety as distinctly as the mechanical interlock feature does. Therefore, the unique safety aspect of an interlock is what sets removable mechanical guards apart from fixed ones.