3-position enabling switch small within its class

IDEC HE6B enabling switches provide a compact and ergonomic design and meets all major robotics industry requirements. Device is ergonomically designed to work where human interaction is required to turn on a machine or robot arm while the user is in a potentially dangerous area. The 3-position enabling switch turns a machine on when pressed, and turns machines off when over pressed or squeezed, as long as the switch is installed correctly in an adequate safety circuit. Two contacts are provided so that even if one contact fails, the other can disable machine operation.

http://www.idec.com/usa