Electronic overspeed switch, hollow shaft version

The EGSH 40 is an electronic overspeed switch with a hollow shaft design and functions independent of an encoder. It fulfills the highest work safety and accident prevention requirements for operating statuses such as "safe standstill", "safe limited speed" as well as those applicable when carrying out maintenance procedures on live components and devices. The EGSH 40 replaces its predecessor model EGSH 4; it is available for switching speeds from 0.63 rpm. The actual speed is continuously compared with the programmed limit speeds stored in the non-volatile memory. The evaluation unit triggers the corresponding switch if the limit speed is reached.


Diameter hollow shaft

16 mm or 20 mm

Supply voltage

12 - 30 VDC

100 - 240 VAC

Number of switching speeds

2 or 4

Switching speed ranges

0.63 to 300 rpm

1.25 to 600 rpm

2.5 to 1200 rpm

5 to 2400 rpm

10 to 4800 rpm

Setting range

Programmable across the whole switching speed range

Programming interface

Mini USB

Switching voltage

2 - 30 VDC/max. 300 mA (optional: 30 - 230 V AC/DC / max. 300 mA)

Switching function

NC contact

Programmable functions

Monitor switching function

Monitor underspeeds

Direction of rotation switch

Switching hysteresis (min. 10 %)

Switch delay (0 - 300 ms)

Device temperature range

-25 °C to +85 °C (optional: -40 °C to +85 °C)

Degree of protection

IP65, IP66


approx. 4 kg

Operating and Assembly Instructions (PDF, 3.29 MB) Download
Software EGS4x Pro (ZIP, 5.57 MB) Download


Version: 4 Rev 4.1

For Microsoft Windows® 98, NT, 2000, XP, Vista, 7

Catalog - Torque brackets (PDF, 951 KB) Download


Standard dimension drawings and connection diagrams are provided in the Operating and Installation Instructions. We would be pleased to send you individual variations as well as DXF/STEP files on request.