The SW-520D is a commonly used rolling ball tilt sensor consisting of two conductive elements (rods) and a conductive free mass (rolling ball) encased in the same housing.
The switch is in the OFF position in the horizontal position and in the ON position when rising to 15-90 degrees or wobbling.
When the OFF end of the switch is 15 degrees below the horizontal angle, it is difficult to trigger conduction when jiggling.
Widely used in electronic toys, medical electronics, car audio, automatic control systems, test and measurement equipment, automotive transport and other fields.

About manual measurement: please note that the reference size information provided may have a slight error of 1-2mm due to possible differences between manual measurement and mass production.