The OsiSense XCRE and OsiSense XCRF single speed travel limit control are limit switches with a contactor inside to break main power circuit on the machine. They are complete units with 1 cable entry and positive opening contacts with choice on contact operations. While the OsiSense XCKMR single or double speed travel limit control is a complete unit with 3 cable entries and positive opening contacts with one per position. All are dedicated products for overhead cranes and block hoists and a very rugged heavy duty metal cases.