Overspeed switches

  • Monitor overspeed and standstill
  • Hollow shafts (insulated ball bearings) up to Ø 17 mm, solid shaft Ø 11 mm (flange attachment)
  • Nonwearing semi-conductor switch (NO contact): one switching output set ex works
  • Switching capacity up to 30 VDC and 0.5 A
Overspeed switches

The preset speed monitors

The electronic speed switches monitor the factory-set speed with high switching accuracy, including low operating speeds. Alternatively, they can be used as standstill monitors. As a consequence, the speed switches play their part in system and personnel protection. They are installed on motors, for example in cranes, in mining operations as well as in rolling mills and more.

Technical Data

Supply Voltage

12-30 VDC

Number Of Switches


Switching Voltage

0-30 VDC

Switching Speed Range
  • 1-6300 rpm with solid shaft
  • 1-5400 rpm with hollow shaft
Switching Function
  • Speed monitoring: Opens when switching speed exceeded
  • Standstill monitoring: Opens when angle of rotation is altered
  • Switching points set ex-works
Maximum Rotation
  • Up to 7000 rpm with solid shaft
  • Up to 6000 rpm with hollow shaft
Electrical Connection
  • Terminal box (copper cable)
  • Preinstalled copper cable (0.6-3 m)
Construction Type And Diameter
  • Solid shaft (B5) / Ø 11 mm with feather key
  • Hollow shaft (insulated bearings) / Ø 12 mm, Ø 16 mm with clamp, Ø 17 mm with taper 1:10
Device Temperature Range

-25 °C to + 85 °C

Degree Of Protection



Approx. 2 kg

Device Options

Incremental output: See FG 2 with option S

Mechanical Options

Hollow shaft devices: Torque bracket (on request)

Special Features And Certificates



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