Rotary limit switch used to control and measure the movement of industrial machines by measuring the rotation angle and/or counting the number of revolutions of a shaft.
Fox is used on wind turbines to control the position of the nacelle or the pitch angle of the blades.


  • It consists of a gear motor that transfers movement to the cams and the other movement detection devices through a primary input reduction stage (worm gear and helical toothed gear) and one or more secondary output stages (pairs of straight toothed gears).
  • Accurate adjustment of cams by means of screws.
  • Positive opening NC contacts for safety functions.
  • Mechanical life of switches: up to 10 million operations.
  • IP protection degree: Fox is classified IP66, IP67 and IP69K.
  • NEMA protection degree: Fox is classified Type 4X*.
  • Extreme temperature resistance: -40°C to +80°C.
  • It features transmission and gear driving shafts made of stainless steel AISI 430F or AISI 303. worm gear transmission shaft rotating on ball bearings, self-lubricating technopolymer gears and driving bushes, technopolymer base and cover.
  • All materials and components used are wear resistant and guarantee protection of the unit against water and dust.


  • Revolution ratios from 1:3 to 1:2870. achieved by combining different secondary output stages.
  • Snap action switches with 1NO+1NC change-over contacts or slow action switches with 1NC contact.
  • It can be equipped with a cam set (with up to 5 switches) and potentiometers, encoders. Yankee absolute encoders.
  • Dedicated cable clamps or connectors.
  • Available with anti-moisture plug fitted to the base by means of a lock nut, to improve transpiration for the limit switch whilst maintaining protection against water.
  • Available with flanges, pinions and couplings.
  • Plates with universal adapter to replace existing systems.


  • Storage ambient temperature: -40°C/+80°C
  • Operational ambient temperature: -40°C/+80°C
  • Protection degree: IP 66 / IP 67 / IP 69K
  • NEMA Protection degree: Type 4X*
  • Insulation category: Class II
  • Rotation speed
    • revolution ratios ≥1:16: max. 800 rev./min.
    • revolution ratios <1:16: max. 200 rev./min.
    • revolution ratios =1:50 and 1:100: max. 1500 rev./min.
  • Cable entry: cable clamp M20, M20+M16, M20+M20
  • HALT test (data available on request)


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