Speed switch / overspeed switch / speed monitor

EGS 40 / EGSH(J) 40

  • Monitor overspeeds and underspeeds (programmable)
  • Hollow shafts up to Ø 25 mm, solid shafts up to Ø 14 mm (flange or foot mounting)
  • Relay contact / switching output: Up to 4 programmable / up to 2 diagnostics
  • Options: Isolated ball bearings (hollow shaft), additional incremental output, further encoders attachable
Overspeed switchesIncremental encoders
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Speed switch / overspeed switch / speed monitor

The electronic speed switches (overspeed switches) monitor as many as 4 programmable speed ranges (overspeed, underspeed and standstill) with a high level of switching accuracy, including at low operating speeds. If a programmed speed is exceeded or is too low, the respective switching output switches. As a consequence, the speed switches play their part in system and personnel protection. The speed monitors are installed on motors on cranes, in mining operations as well as in rolling mills and more. When devices are swapped it is possible to transfer the parameters previously stored on the first device to the new device.

Technical Data

Supply voltage

12-30 VDC or 100-240 VAC

Number of switches

2 or 4

Switching voltage

2-30 VDC or 30-230 VAC/DC

Switching speed range
  • 0.63-6000 rpm with solid shaft
  • 0.63-4000 rpm with hollow shaft
Switching function
  • Speed monitoring: Opens when switching speed exceeded or fallen below
  • Additional functions: Direction of rotation switch, switching hysteresis (min. 10%), switching delay (0-300 ms), …
  • Programming via the selected switching speed range (interface: Mini USB)
Maximum rotation
  • Up to 6000 rpm with solid shaft
  • Up to 4000 rpm with hollow shaft
Electrical connection
  • Terminal strip in a terminal box
  • Fixed cable (0.6-3 m)
  • 12-pole round connector Burndy
  • 15-pole industrial connector
Construction type / Ø shafts
  • Solid shaft (B5, B35): Ø 11 mm, Ø 14 mm with feather key
  • Hollow shaft / Ø 16 mm, Ø 19 mm, Ø 20 mm with keyway; Ø 16 mm, Ø 25 mm with clamp
Device temperature range
  • 0 °C to +70 °C
  • -25 °C to +85 °C
  • -40 °C to +85 °C (on request)
Degree of protection

Up to IP66 / IP67


Approx. 3.5 kg

Device options

Incremental output: See FG 40 with option S

Mechanical options
  • Second shaft end with B14 flange for attachments (solid shaft construction type only)
  • Additional foot (solid shaft construction type only)
  • Isolated ball bearing (hollow shaft construction type only)
  • MI: Saliferous environment
  • MS: Wet areas in rolling mills
  • Hollow shaft devices: Torque bracket (on request)
Special features and certificates

UL/CSA (for all devices with connection technology „Terminal strip in a terminal box“ and up to 30 V supply voltage / switching voltage)



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