Which type of retractor remains loose under normal conditions and locks when pulled quickly?

A switchable retractor is designed to function in a manner that allows it to operate in two modes: an automatic locking mode and a mode that allows for adjusted restraint. Under normal circumstances, this type of retractor remains loose, permitting ease of use when securing the child seat. However, when the retractor is pulled rapidly, it engages a locking mechanism, providing enhanced safety during sudden stops or collisions. This feature is particularly beneficial because it allows caregivers the flexibility to adjust the harness as needed while ensuring the child is securely restrained if an emergency occurs.

In contrast, the other types of retractors have different locking mechanisms and uses. For instance, an automatic locking retractor locks as soon as a certain length of the webbing is pulled and does not allow for loosening afterward, which may not provide the same ease of adjustment. An emergency locking retractor locks in response to a rapid pull, but it primarily serves as a safety measure during accidents and may not allow for the same ease of adjustment before engagement. A static retractor, on the other hand, does not allow any movement of the seatbelt webbing, making it impractical for use with child safety seats needing adjustments. Thus, the characteristics and functionalities of the switchable retractor align