Snap-Action Switch with 18.5mm Bump Lever: 3-Pin, SPDT, 5A

This single-pole, double-throw (SPDT) momentary switch can be used as a general-purpose micro switch or tactile obstacle-detector for your robot. The lever arm has a semicircular bump at the tip that simulates a roller. This three-pin switch can also be used as a two-pin single-pole, single-throw (SPST) switch that is open or closed by default, depending on which two pins are used.

Dimensions (in mm) of snap-action switch with 18.5mm bump lever: 3-pin, SPDT, 5A.

Specification change: As of May 2024, all units of this product are shipping with a slightly longer lever arm (18.5 mm compared to 15.6 mm for earlier units). The dimension diagram above is accurate for all current units.

For a more sophisticated tactile sensor, see our force-sensing resistors.