This protective cover is suitable for ordinary household light switches. It can fix the switch to its default position and effectively prevent the switch from deviating from its default position due to accidental operation. The design deliberately increases the difficulty of moving the switch out of its default position, but it can still be easily reset with a fingertip when needed. And it's extremely convenient to restore the switch to its default position.

This product is inspired by the item numbered 1703339, but it has been redesigned: the ends are rounded, the edges are beveled, and multiple protective structures have been added in the default position, further enhancing the safety and durability of use.

The SketchUp design files are included as a bonus.

Update on May 11, 2017: In response to user requests, I have uploaded an STL file in which the horizontal dimension of the switch opening has been enlarged by 1.3 mm