Overspeed switches

  • Monitor overspeed and standstill
  • Hollow shafts (isolated ball bearings) up to Ø 17 mm, solid shaft Ø 11 mm (flange mounting)
  • Nonwearing semi-conductor switch (NO contact): one switching output set ex works
  • Switching capacity up to 30 VDC and 0.5 A
Overspeed switches
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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 strip in a terminal box
  • Fixed cable (0.6-3 m)
Construction type / Ø shafts
  • Solid shaft (B5) / Ø 11 mm with feather key
  • Hollow shaft (isolated 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
  • UL/CSA
  • EGSHJ 2: Increased dielectric strength up to 3 kV (direct mounting to drive-controlled motors)    




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