iSENS_HESiSENS HES anti-two block switches assist in reducing equipment damage by preventing the hook block from contacting the boom tip on cranes and other lifting equipment.

The electrical switch element is completely sealed in the housing.  The housing is made of a corrosion-proof, light metal alloy and is treated and coated making it resistant to the damaging affects of the environment.  Depending on the type, one or two sectional resistors allow monitoring the feed line.



  • Anti-two block switch for winches, lifting devices, and cranes
  • Accepted as an emergency limit switch by IFA (professional association for safety standards at work), acceptance test no. IFA 1104028
  • Fully sealed electrical unit